src/sysdep.c

   1 /* Interfaces to system-dependent kernel and library entries.
   2    Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994, 1995, 1999, 2000, 2001,
   3                  2002, 2003, 2004, 2005, 2006, 2007, 2008
   4                  Free Software Foundation, Inc.
   5
   6 This file is part of GNU Emacs.
   7
   8 GNU Emacs is free software: you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation, either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 GNU Emacs is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include <config.h>
  23 #endif
  24
  25 #include <signal.h>
  26 #include <stdio.h>
  27 #include <setjmp.h>
  28 #ifdef HAVE_UNISTD_H
  29 #include <unistd.h>
  30 #endif
  31 #include "lisp.h"
  32 /* Including stdlib.h isn't necessarily enough to get srandom
  33    declared, e.g. without __USE_XOPEN_EXTENDED with glibc 2.  */
  34
  35 /* The w32 build defines select stuff in w32.h, which is included by
  36    sys/select.h (included below).   */
  37 #ifndef WINDOWSNT
  38 #include "sysselect.h"
  39 #endif
  40
  41 #include "blockinput.h"
  42
  43 #ifdef WINDOWSNT
  44 #define read sys_read
  45 #define write sys_write
  46 #include <windows.h>
  47 #ifndef NULL
  48 #define NULL 0
  49 #endif
  50 #endif /* not WINDOWSNT */
  51
  52 /* Does anyone other than VMS need this? */
  53 #ifndef fwrite
  54 #define sys_fwrite fwrite
  55 #else
  56 #undef fwrite
  57 #endif
  58
  59 #include <sys/types.h>
  60 #include <sys/stat.h>
  61 #include <errno.h>
  62
  63 #ifdef HAVE_SETPGID
  64 #if !defined (USG) || defined (BSD_PGRPS)
  65 #undef setpgrp
  66 #define setpgrp setpgid
  67 #endif
  68 #endif
  69
  70 /* Get SI_SRPC_DOMAIN, if it is available.  */
  71 #ifdef HAVE_SYS_SYSTEMINFO_H
  72 #include <sys/systeminfo.h>
  73 #endif
  74
  75 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
  76 #include <dos.h>
  77 #include "dosfns.h"
  78 #include "msdos.h"
  79 #include <sys/param.h>
  80
  81 #if __DJGPP__ > 1
  82 extern int etext;
  83 extern unsigned start __asm__ ("start");
  84 #endif
  85 #endif
  86
  87 #ifndef USE_CRT_DLL
  88 #ifndef errno
  89 extern int errno;
  90 #endif
  91 #endif
  92
  93 #ifdef VMS
  94 #include <rms.h>
  95 #include <ttdef.h>
  96 #include <tt2def.h>
  97 #include <iodef.h>
  98 #include <ssdef.h>
  99 #include <descrip.h>
 100 #include <fibdef.h>
 101 #include <atrdef.h>
 102 #include <ctype.h>
 103 #include <string.h>
 104 #ifdef __GNUC__
 105 #include <sys/file.h>
 106 #else
 107 #include <file.h>
 108 #endif
 109 #undef F_SETFL
 110 #ifndef RAB$C_BID
 111 #include <rab.h>
 112 #endif
 113 #define MAXIOSIZE (32 * PAGESIZE) /* Don't I/O more than 32 blocks at a time */
 114 #endif /* VMS */
 115
 116 #ifndef VMS
 117 #include <sys/file.h>
 118 #endif /* not VMS */
 119
 120 #ifdef HAVE_FCNTL_H
 121 #include <fcntl.h>
 122 #endif
 123
 124 #ifndef MSDOS
 125 #include <sys/ioctl.h>
 126 #endif
 127
 128 #include "systty.h"
 129 #include "syswait.h"
 130
 131 #if defined (USG)
 132 #include <sys/utsname.h>
 133 #include <memory.h>
 134 #endif /* USG */
 135
 136 extern int quit_char;
 137
 138 #include "keyboard.h"
 139 #include "frame.h"
 140 #include "window.h"
 141 #include "termhooks.h"
 142 #include "termchar.h"
 143 #include "termopts.h"
 144 #include "dispextern.h"
 145 #include "process.h"
 146 #include "cm.h"  /* for reset_sys_modes */
 147
 148 /* For serial_configure and serial_open.  */
 149 extern Lisp_Object QCport, QCspeed, QCprocess;
 150 extern Lisp_Object QCbytesize, QCstopbits, QCparity, Qodd, Qeven;
 151 extern Lisp_Object QCflowcontrol, Qhw, Qsw, QCsummary;
 152
 153 #ifdef WINDOWSNT
 154 #include <direct.h>
 155 /* In process.h which conflicts with the local copy.  */
 156 #define _P_WAIT 0
 157 int _cdecl _spawnlp (int, const char *, const char *, ...);
 158 int _cdecl _getpid (void);
 159 extern char *getwd (char *);
 160 #endif
 161
 162 #ifdef NONSYSTEM_DIR_LIBRARY
 163 #include "ndir.h"
 164 #endif /* NONSYSTEM_DIR_LIBRARY */
 165
 166 #include "syssignal.h"
 167 #include "systime.h"
 168 #ifdef HAVE_UTIME_H
 169 #include <utime.h>
 170 #endif
 171
 172 #ifndef HAVE_UTIMES
 173 #ifndef HAVE_STRUCT_UTIMBUF
 174 /* We want to use utime rather than utimes, but we couldn't find the
 175    structure declaration.  We'll use the traditional one.  */
 176 struct utimbuf {
 177   long actime;
 178   long modtime;
 179 };
 180 #endif
 181 #endif
 182
 183 /* LPASS8 is new in 4.3, and makes cbreak mode provide all 8 bits.  */
 184 #ifndef LPASS8
 185 #define LPASS8 0
 186 #endif
 187
 188 static int baud_convert[] =
 189   {
 190     0, 50, 75, 110, 135, 150, 200, 300, 600, 1200,
 191     1800, 2400, 4800, 9600, 19200, 38400
 192   };
 193
 194 #ifdef HAVE_SPEED_T
 195 #include <termios.h>
 196 #else
 197 #if defined (HAVE_LIBNCURSES) && ! defined (NCURSES_OSPEED_T)
 198 #else
 199 #if defined (HAVE_TERMIOS_H) && defined (GNU_LINUX)
 200 #include <termios.h>
 201 #endif
 202 #endif
 203 #endif
 204
 205 int emacs_ospeed;
 206
 207 void croak P_ ((char *)) NO_RETURN;
 208
 209 /* Temporary used by `sigblock' when defined in terms of signprocmask.  */
 210
 211 SIGMASKTYPE sigprocmask_set;
 212
 213
 214 #if !defined (HAVE_GET_CURRENT_DIR_NAME) || defined (BROKEN_GET_CURRENT_DIR_NAME)
 215
 216 /* Return the current working directory.  Returns NULL on errors.
 217    Any other returned value must be freed with free. This is used
 218    only when get_current_dir_name is not defined on the system.  */
 219 char*
 220 get_current_dir_name ()
 221 {
 222   char *buf;
 223   char *pwd;
 224   struct stat dotstat, pwdstat;
 225   /* If PWD is accurate, use it instead of calling getwd.  PWD is
 226      sometimes a nicer name, and using it may avoid a fatal error if a
 227      parent directory is searchable but not readable.  */
 228     if ((pwd = getenv ("PWD")) != 0
 229       && (IS_DIRECTORY_SEP (*pwd) || (*pwd && IS_DEVICE_SEP (pwd[1])))
 230       && stat (pwd, &pwdstat) == 0
 231       && stat (".", &dotstat) == 0
 232       && dotstat.st_ino == pwdstat.st_ino
 233       && dotstat.st_dev == pwdstat.st_dev
 234 #ifdef MAXPATHLEN
 235       && strlen (pwd) < MAXPATHLEN
 236 #endif
 237       )
 238     {
 239       buf = (char *) malloc (strlen (pwd) + 1);
 240       if (!buf)
 241         return NULL;
 242       strcpy (buf, pwd);
 243     }
 244 #ifdef HAVE_GETCWD
 245   else
 246     {
 247       size_t buf_size = 1024;
 248       buf = (char *) malloc (buf_size);
 249       if (!buf)
 250         return NULL;
 251       for (;;)
 252         {
 253           if (getcwd (buf, buf_size) == buf)
 254             break;
 255           if (errno != ERANGE)
 256             {
 257               int tmp_errno = errno;
 258               free (buf);
 259               errno = tmp_errno;
 260               return NULL;
 261             }
 262           buf_size *= 2;
 263           buf = (char *) realloc (buf, buf_size);
 264           if (!buf)
 265             return NULL;
 266         }
 267     }
 268 #else
 269   else
 270     {
 271       /* We need MAXPATHLEN here.  */
 272       buf = (char *) malloc (MAXPATHLEN + 1);
 273       if (!buf)
 274         return NULL;
 275       if (getwd (buf) == NULL)
 276         {
 277           int tmp_errno = errno;
 278           free (buf);
 279           errno = tmp_errno;
 280           return NULL;
 281         }
 282     }
 283 #endif
 284   return buf;
 285 }
 286 #endif
 287
 288 \f
 289 /* Discard pending input on all input descriptors.  */
 290
 291 void
 292 discard_tty_input ()
 293 {
 294 #ifndef WINDOWSNT
 295   struct emacs_tty buf;
 296
 297   if (noninteractive)
 298     return;
 299
 300 #ifdef VMS
 301   end_kbd_input ();
 302   SYS$QIOW (0, fileno (CURTTY()->input), IO$_READVBLK|IO$M_PURGE, input_iosb, 0, 0,
 303             &buf.main, 0, 0, terminator_mask, 0, 0);
 304   queue_kbd_input ();
 305 #else /* not VMS */
 306 #ifdef MSDOS    /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
 307   while (dos_keyread () != -1)
 308     ;
 309 #else /* not MSDOS */
 310   {
 311     struct tty_display_info *tty;
 312     for (tty = tty_list; tty; tty = tty->next)
 313       {
 314         if (tty->input)         /* Is the device suspended? */
 315           {
 316             EMACS_GET_TTY (fileno (tty->input), &buf);
 317             EMACS_SET_TTY (fileno (tty->input), &buf, 0);
 318           }
 319       }
 320   }
 321 #endif /* not MSDOS */
 322 #endif /* not VMS */
 323 #endif /* not WINDOWSNT */
 324 }
 325
 326 \f
 327 #ifdef SIGTSTP
 328
 329 /* Arrange for character C to be read as the next input from
 330    the terminal.
 331    XXX What if we have multiple ttys?
 332 */
 333
 334 void
 335 stuff_char (char c)
 336 {
 337   if (! FRAME_TERMCAP_P (SELECTED_FRAME ()))
 338     return;
 339
 340 /* Should perhaps error if in batch mode */
 341 #ifdef TIOCSTI
 342   ioctl (fileno (CURTTY()->input), TIOCSTI, &c);
 343 #else /* no TIOCSTI */
 344   error ("Cannot stuff terminal input characters in this version of Unix");
 345 #endif /* no TIOCSTI */
 346 }
 347
 348 #endif /* SIGTSTP */
 349 \f
 350 void
 351 init_baud_rate (int fd)
 352 {
 353   if (noninteractive)
 354     emacs_ospeed = 0;
 355   else
 356     {
 357 #ifdef DOS_NT
 358     emacs_ospeed = 15;
 359 #else  /* not DOS_NT */
 360 #ifdef VMS
 361       struct sensemode sg;
 362
 363       SYS$QIOW (0, fd, IO$_SENSEMODE, &sg, 0, 0,
 364                 &sg.class, 12, 0, 0, 0, 0 );
 365       emacs_ospeed = sg.xmit_baud;
 366 #else /* not VMS */
 367 #ifdef HAVE_TERMIOS
 368       struct termios sg;
 369
 370       sg.c_cflag = B9600;
 371       tcgetattr (fd, &sg);
 372       emacs_ospeed = cfgetospeed (&sg);
 373 #else /* neither VMS nor TERMIOS */
 374 #ifdef HAVE_TERMIO
 375       struct termio sg;
 376
 377       sg.c_cflag = B9600;
 378 #ifdef HAVE_TCATTR
 379       tcgetattr (fd, &sg);
 380 #else
 381       ioctl (fd, TCGETA, &sg);
 382 #endif
 383       emacs_ospeed = sg.c_cflag & CBAUD;
 384 #else /* neither VMS nor TERMIOS nor TERMIO */
 385       struct sgttyb sg;
 386
 387       sg.sg_ospeed = B9600;
 388       if (ioctl (fd, TIOCGETP, &sg) < 0)
 389         abort ();
 390       emacs_ospeed = sg.sg_ospeed;
 391 #endif /* not HAVE_TERMIO */
 392 #endif /* not HAVE_TERMIOS */
 393 #endif /* not VMS */
 394 #endif /* not DOS_NT */
 395     }
 396
 397   baud_rate = (emacs_ospeed < sizeof baud_convert / sizeof baud_convert[0]
 398                ? baud_convert[emacs_ospeed] : 9600);
 399   if (baud_rate == 0)
 400     baud_rate = 1200;
 401 }
 402
 403 \f
 404 /*ARGSUSED*/
 405 void
 406 set_exclusive_use (fd)
 407      int fd;
 408 {
 409 #ifdef FIOCLEX
 410   ioctl (fd, FIOCLEX, 0);
 411 #endif
 412   /* Ok to do nothing if this feature does not exist */
 413 }
 414 \f
 415 #ifndef subprocesses
 416
 417 wait_without_blocking ()
 418 {
 419 #ifdef BSD_SYSTEM
 420   wait3 (0, WNOHANG | WUNTRACED, 0);
 421 #else
 422   croak ("wait_without_blocking");
 423 #endif
 424   synch_process_alive = 0;
 425 }
 426
 427 #endif /* not subprocesses */
 428
 429 int wait_debugging;   /* Set nonzero to make following function work under dbx
 430                          (at least for bsd).  */
 431
 432 SIGTYPE
 433 wait_for_termination_signal ()
 434 {}
 435
 436 /* Wait for subprocess with process id `pid' to terminate and
 437    make sure it will get eliminated (not remain forever as a zombie) */
 438
 439 void
 440 wait_for_termination (pid)
 441      int pid;
 442 {
 443   while (1)
 444     {
 445 #ifdef subprocesses
 446 #ifdef VMS
 447       int status;
 448
 449       status = SYS$FORCEX (&pid, 0, 0);
 450       break;
 451 #else /* not VMS */
 452 #if defined (BSD_SYSTEM) || defined (HPUX)
 453       /* Note that kill returns -1 even if the process is just a zombie now.
 454          But inevitably a SIGCHLD interrupt should be generated
 455          and child_sig will do wait3 and make the process go away. */
 456       /* There is some indication that there is a bug involved with
 457          termination of subprocesses, perhaps involving a kernel bug too,
 458          but no idea what it is.  Just as a hunch we signal SIGCHLD to see
 459          if that causes the problem to go away or get worse.  */
 460       sigsetmask (sigmask (SIGCHLD));
 461       if (0 > kill (pid, 0))
 462         {
 463           sigsetmask (SIGEMPTYMASK);
 464           kill (getpid (), SIGCHLD);
 465           break;
 466         }
 467       if (wait_debugging)
 468         sleep (1);
 469       else
 470         sigpause (SIGEMPTYMASK);
 471 #else /* not BSD_SYSTEM, and not HPUX version >= 6 */
 472 #ifdef POSIX_SIGNALS    /* would this work for GNU/Linux as well? */
 473       sigblock (sigmask (SIGCHLD));
 474       errno = 0;
 475       if (kill (pid, 0) == -1 && errno == ESRCH)
 476         {
 477           sigunblock (sigmask (SIGCHLD));
 478           break;
 479         }
 480
 481       sigsuspend (&empty_mask);
 482 #else /* not POSIX_SIGNALS */
 483 #ifdef HAVE_SYSV_SIGPAUSE
 484       sighold (SIGCHLD);
 485       if (0 > kill (pid, 0))
 486         {
 487           sigrelse (SIGCHLD);
 488           break;
 489         }
 490       sigpause (SIGCHLD);
 491 #else /* not HAVE_SYSV_SIGPAUSE */
 492 #ifdef WINDOWSNT
 493       wait (0);
 494       break;
 495 #else /* not WINDOWSNT */
 496       if (0 > kill (pid, 0))
 497         break;
 498       /* Using sleep instead of pause avoids timing error.
 499          If the inferior dies just before the sleep,
 500          we lose just one second.  */
 501       sleep (1);
 502 #endif /* not WINDOWSNT */
 503 #endif /* not HAVE_SYSV_SIGPAUSE */
 504 #endif /* not POSIX_SIGNALS */
 505 #endif /* not BSD_SYSTEM, and not HPUX version >= 6 */
 506 #endif /* not VMS */
 507 #else /* not subprocesses */
 508 #if __DJGPP__ > 1
 509       break;
 510 #else /* not __DJGPP__ > 1 */
 511       if (kill (pid, 0) < 0)
 512         break;
 513       wait (0);
 514 #endif /* not __DJGPP__ > 1*/
 515 #endif /* not subprocesses */
 516     }
 517 }
 518
 519 #ifdef subprocesses
 520
 521 /*
 522  *      flush any pending output
 523  *      (may flush input as well; it does not matter the way we use it)
 524  */
 525
 526 void
 527 flush_pending_output (channel)
 528      int channel;
 529 {
 530 #ifdef HAVE_TERMIOS
 531   /* If we try this, we get hit with SIGTTIN, because
 532      the child's tty belongs to the child's pgrp. */
 533 #else
 534 #ifdef TCFLSH
 535   ioctl (channel, TCFLSH, 1);
 536 #else
 537 #ifdef TIOCFLUSH
 538   int zero = 0;
 539   /* 3rd arg should be ignored
 540      but some 4.2 kernels actually want the address of an int
 541      and nonzero means something different.  */
 542   ioctl (channel, TIOCFLUSH, &zero);
 543 #endif
 544 #endif
 545 #endif
 546 }
 547 \f
 548 #ifndef VMS
 549 /*  Set up the terminal at the other end of a pseudo-terminal that
 550     we will be controlling an inferior through.
 551     It should not echo or do line-editing, since that is done
 552     in Emacs.  No padding needed for insertion into an Emacs buffer.  */
 553
 554 void
 555 child_setup_tty (out)
 556      int out;
 557 {
 558 #ifndef DOS_NT
 559   struct emacs_tty s;
 560
 561   EMACS_GET_TTY (out, &s);
 562
 563 #if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
 564   s.main.c_oflag |= OPOST;      /* Enable output postprocessing */
 565   s.main.c_oflag &= ~ONLCR;     /* Disable map of NL to CR-NL on output */
 566 #ifdef NLDLY
 567   /* http://lists.gnu.org/archive/html/emacs-devel/2008-05/msg00406.html
 568      Some versions of GNU Hurd do not have FFDLY?  */
 569 #ifdef FFDLY
 570   s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
 571                                 /* No output delays */
 572 #else
 573   s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY);
 574                                 /* No output delays */
 575 #endif
 576 #endif
 577   s.main.c_lflag &= ~ECHO;      /* Disable echo */
 578   s.main.c_lflag |= ISIG;       /* Enable signals */
 579 #ifdef IUCLC
 580   s.main.c_iflag &= ~IUCLC;     /* Disable downcasing on input.  */
 581 #endif
 582 #ifdef ISTRIP
 583   s.main.c_iflag &= ~ISTRIP;    /* don't strip 8th bit on input */
 584 #endif
 585 #ifdef OLCUC
 586   s.main.c_oflag &= ~OLCUC;     /* Disable upcasing on output.  */
 587 #endif
 588   s.main.c_oflag &= ~TAB3;      /* Disable tab expansion */
 589   s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
 590   s.main.c_lflag |= ICANON;     /* Enable erase/kill and eof processing */
 591   s.main.c_cc[VEOF] = 04;       /* insure that EOF is Control-D */
 592   s.main.c_cc[VERASE] = CDISABLE;       /* disable erase processing */
 593   s.main.c_cc[VKILL] = CDISABLE;        /* disable kill processing */
 594
 595 #ifdef HPUX
 596   s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
 597 #endif /* HPUX */
 598
 599 #ifdef SIGNALS_VIA_CHARACTERS
 600   /* the QUIT and INTR character are used in process_send_signal
 601      so set them here to something useful.  */
 602   if (s.main.c_cc[VQUIT] == CDISABLE)
 603     s.main.c_cc[VQUIT] = '\\'&037;      /* Control-\ */
 604   if (s.main.c_cc[VINTR] == CDISABLE)
 605     s.main.c_cc[VINTR] = 'C'&037;       /* Control-C */
 606 #endif /* not SIGNALS_VIA_CHARACTERS */
 607
 608 #ifdef AIX
 609 /* AIX enhanced edit loses NULs, so disable it */
 610 #ifndef IBMR2AIX
 611   s.main.c_line = 0;
 612   s.main.c_iflag &= ~ASCEDIT;
 613 #endif
 614   /* Also, PTY overloads NUL and BREAK.
 615      don't ignore break, but don't signal either, so it looks like NUL.  */
 616   s.main.c_iflag &= ~IGNBRK;
 617   s.main.c_iflag &= ~BRKINT;
 618   /* rms: Formerly it set s.main.c_cc[VINTR] to 0377 here
 619      unconditionally.  Then a SIGNALS_VIA_CHARACTERS conditional
 620      would force it to 0377.  That looks like duplicated code.  */
 621 #ifndef SIGNALS_VIA_CHARACTERS
 622   /* QUIT and INTR work better as signals, so disable character forms */
 623   s.main.c_cc[VQUIT] = CDISABLE;
 624   s.main.c_cc[VINTR] = CDISABLE;
 625   s.main.c_lflag &= ~ISIG;
 626 #endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
 627   s.main.c_cc[VEOL] = CDISABLE;
 628   s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
 629 #endif /* AIX */
 630
 631 #else /* not HAVE_TERMIO */
 632
 633   s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
 634                        | CBREAK | TANDEM);
 635   s.main.sg_flags |= LPASS8;
 636   s.main.sg_erase = 0377;
 637   s.main.sg_kill = 0377;
 638   s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
 639
 640 #endif /* not HAVE_TERMIO */
 641
 642   EMACS_SET_TTY (out, &s, 0);
 643
 644 #endif /* not DOS_NT */
 645 }
 646 #endif /* not VMS */
 647
 648 #endif /* subprocesses */
 649 \f
 650 /* Record a signal code and the handler for it.  */
 651 struct save_signal
 652 {
 653   int code;
 654   SIGTYPE (*handler) P_ ((int));
 655 };
 656
 657 static void save_signal_handlers P_ ((struct save_signal *));
 658 static void restore_signal_handlers P_ ((struct save_signal *));
 659
 660 /* Suspend the Emacs process; give terminal to its superior.  */
 661
 662 void
 663 sys_suspend ()
 664 {
 665 #ifdef VMS
 666   /* "Foster" parentage allows emacs to return to a subprocess that attached
 667      to the current emacs as a cheaper than starting a whole new process.  This
 668      is set up by KEPTEDITOR.COM.  */
 669   unsigned long parent_id, foster_parent_id;
 670   char *fpid_string;
 671
 672   fpid_string = getenv ("EMACS_PARENT_PID");
 673   if (fpid_string != NULL)
 674     {
 675       sscanf (fpid_string, "%x", &foster_parent_id);
 676       if (foster_parent_id != 0)
 677         parent_id = foster_parent_id;
 678       else
 679         parent_id = getppid ();
 680     }
 681   else
 682     parent_id = getppid ();
 683
 684   xfree (fpid_string);          /* On VMS, this was malloc'd */
 685
 686   if (parent_id && parent_id != 0xffffffff)
 687     {
 688       SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
 689       int status = LIB$ATTACH (&parent_id) & 1;
 690       signal (SIGINT, oldsig);
 691       return status;
 692     }
 693   else
 694     {
 695       struct {
 696         int     l;
 697         char    *a;
 698       } d_prompt;
 699       d_prompt.l = sizeof ("Emacs: ");          /* Our special prompt */
 700       d_prompt.a = "Emacs: ";                   /* Just a reminder */
 701       LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
 702       return 1;
 703     }
 704   return -1;
 705 #else
 706 #if defined (SIGTSTP) && !defined (MSDOS)
 707
 708   {
 709     int pgrp = EMACS_GETPGRP (0);
 710     EMACS_KILLPG (pgrp, SIGTSTP);
 711   }
 712
 713 #else /* No SIGTSTP */
 714 #ifdef USG_JOBCTRL /* If you don't know what this is don't mess with it */
 715   ptrace (0, 0, 0, 0);          /* set for ptrace - caught by csh */
 716   kill (getpid (), SIGQUIT);
 717
 718 #else /* No SIGTSTP or USG_JOBCTRL */
 719
 720 /* On a system where suspending is not implemented,
 721    instead fork a subshell and let it talk directly to the terminal
 722    while we wait.  */
 723   sys_subshell ();
 724
 725 #endif /* no USG_JOBCTRL */
 726 #endif /* no SIGTSTP */
 727 #endif /* not VMS */
 728 }
 729
 730 /* Fork a subshell.  */
 731
 732 void
 733 sys_subshell ()
 734 {
 735 #ifndef VMS
 736 #ifdef DOS_NT   /* Demacs 1.1.2 91/10/20 Manabu Higashida */
 737   int st;
 738   char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
 739 #endif
 740   int pid;
 741   struct save_signal saved_handlers[5];
 742   Lisp_Object dir;
 743   unsigned char *str = 0;
 744   int len;
 745
 746   saved_handlers[0].code = SIGINT;
 747   saved_handlers[1].code = SIGQUIT;
 748   saved_handlers[2].code = SIGTERM;
 749 #ifdef SIGIO
 750   saved_handlers[3].code = SIGIO;
 751   saved_handlers[4].code = 0;
 752 #else
 753   saved_handlers[3].code = 0;
 754 #endif
 755
 756   /* Mentioning current_buffer->buffer would mean including buffer.h,
 757      which somehow wedges the hp compiler.  So instead...  */
 758
 759   dir = intern ("default-directory");
 760   if (NILP (Fboundp (dir)))
 761     goto xyzzy;
 762   dir = Fsymbol_value (dir);
 763   if (!STRINGP (dir))
 764     goto xyzzy;
 765
 766   dir = expand_and_dir_to_file (Funhandled_file_name_directory (dir), Qnil);
 767   str = (unsigned char *) alloca (SCHARS (dir) + 2);
 768   len = SCHARS (dir);
 769   bcopy (SDATA (dir), str, len);
 770   if (str[len - 1] != '/') str[len++] = '/';
 771   str[len] = 0;
 772  xyzzy:
 773
 774 #ifdef DOS_NT
 775   pid = 0;
 776 #if __DJGPP__ > 1
 777   save_signal_handlers (saved_handlers);
 778   synch_process_alive = 1;
 779 #endif /* __DJGPP__ > 1 */
 780 #else
 781   pid = vfork ();
 782   if (pid == -1)
 783     error ("Can't spawn subshell");
 784 #endif
 785
 786   if (pid == 0)
 787     {
 788       char *sh = 0;
 789
 790 #ifdef DOS_NT    /* MW, Aug 1993 */
 791       getwd (oldwd);
 792       if (sh == 0)
 793         sh = (char *) egetenv ("SUSPEND");      /* KFS, 1994-12-14 */
 794 #endif
 795       if (sh == 0)
 796         sh = (char *) egetenv ("SHELL");
 797       if (sh == 0)
 798         sh = "sh";
 799
 800       /* Use our buffer's default directory for the subshell.  */
 801       if (str)
 802         chdir ((char *) str);
 803
 804 #ifdef subprocesses
 805       close_process_descs ();   /* Close Emacs's pipes/ptys */
 806 #endif
 807
 808 #ifdef SET_EMACS_PRIORITY
 809       {
 810         extern EMACS_INT emacs_priority;
 811
 812         if (emacs_priority < 0)
 813           nice (-emacs_priority);
 814       }
 815 #endif
 816
 817 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
 818       {
 819         char *epwd = getenv ("PWD");
 820         char old_pwd[MAXPATHLEN+1+4];
 821
 822         /* If PWD is set, pass it with corrected value.  */
 823         if (epwd)
 824           {
 825             strcpy (old_pwd, epwd);
 826             if (str[len - 1] == '/')
 827               str[len - 1] = '\0';
 828             setenv ("PWD", str, 1);
 829           }
 830         st = system (sh);
 831         chdir (oldwd);
 832         if (epwd)
 833           putenv (old_pwd);     /* restore previous value */
 834       }
 835 #else /* not MSDOS */
 836 #ifdef  WINDOWSNT
 837       /* Waits for process completion */
 838       pid = _spawnlp (_P_WAIT, sh, sh, NULL);
 839       chdir (oldwd);
 840       if (pid == -1)
 841         write (1, "Can't execute subshell", 22);
 842 #else   /* not WINDOWSNT */
 843       execlp (sh, sh, (char *) 0);
 844       write (1, "Can't execute subshell", 22);
 845       _exit (1);
 846 #endif  /* not WINDOWSNT */
 847 #endif /* not MSDOS */
 848     }
 849
 850   /* Do this now if we did not do it before.  */
 851 #if !defined (MSDOS) || __DJGPP__ == 1
 852   save_signal_handlers (saved_handlers);
 853   synch_process_alive = 1;
 854 #endif
 855
 856 #ifndef DOS_NT
 857   wait_for_termination (pid);
 858 #endif
 859   restore_signal_handlers (saved_handlers);
 860   synch_process_alive = 0;
 861 #endif /* !VMS */
 862 }
 863
 864 static void
 865 save_signal_handlers (saved_handlers)
 866      struct save_signal *saved_handlers;
 867 {
 868   while (saved_handlers->code)
 869     {
 870       saved_handlers->handler
 871         = (SIGTYPE (*) P_ ((int))) signal (saved_handlers->code, SIG_IGN);
 872       saved_handlers++;
 873     }
 874 }
 875
 876 static void
 877 restore_signal_handlers (saved_handlers)
 878      struct save_signal *saved_handlers;
 879 {
 880   while (saved_handlers->code)
 881     {
 882       signal (saved_handlers->code, saved_handlers->handler);
 883       saved_handlers++;
 884     }
 885 }
 886 \f
 887 #ifndef SIGIO
 888 /* If SIGIO is broken, don't do anything. */
 889 void
 890 init_sigio (int fd)
 891 {
 892 }
 893
 894 void
 895 reset_sigio (int fd)
 896 {
 897 }
 898
 899 void
 900 request_sigio (void)
 901 {
 902 }
 903
 904 void
 905 unrequest_sigio (void)
 906 {
 907 }
 908
 909 #else
 910 #ifdef F_SETFL
 911
 912 int old_fcntl_flags[MAXDESC];
 913
 914 void
 915 init_sigio (fd)
 916      int fd;
 917 {
 918 #ifdef FASYNC
 919   old_fcntl_flags[fd] = fcntl (fd, F_GETFL, 0) & ~FASYNC;
 920   fcntl (fd, F_SETFL, old_fcntl_flags[fd] | FASYNC);
 921 #endif
 922   interrupts_deferred = 0;
 923 }
 924
 925 void
 926 reset_sigio (fd)
 927      int fd;
 928 {
 929 #ifdef FASYNC
 930   fcntl (fd, F_SETFL, old_fcntl_flags[fd]);
 931 #endif
 932 }
 933
 934 #ifdef FASYNC           /* F_SETFL does not imply existence of FASYNC */
 935 /* XXX Uhm, FASYNC is not used anymore here. */
 936 /* XXX Yeah, but you need it for SIGIO, don't you? */
 937
 938 void
 939 request_sigio ()
 940 {
 941   if (noninteractive)
 942     return;
 943
 944 #ifdef SIGWINCH
 945   sigunblock (sigmask (SIGWINCH));
 946 #endif
 947   sigunblock (sigmask (SIGIO));
 948
 949   interrupts_deferred = 0;
 950 }
 951
 952 void
 953 unrequest_sigio (void)
 954 {
 955   if (noninteractive)
 956     return;
 957
 958 #if 0 /* XXX What's wrong with blocking SIGIO under X?  */
 959   if (x_display_list)
 960     return;
 961 #endif
 962
 963 #ifdef SIGWINCH
 964   sigblock (sigmask (SIGWINCH));
 965 #endif
 966   sigblock (sigmask (SIGIO));
 967   interrupts_deferred = 1;
 968 }
 969
 970 #else /* no FASYNC */
 971 #ifndef MSDOS
 972
 973 void
 974 request_sigio ()
 975 {
 976   if (noninteractive || read_socket_hook)
 977     return;
 978
 979   croak ("request_sigio");
 980 }
 981
 982 void
 983 unrequest_sigio ()
 984 {
 985   if (noninteractive || read_socket_hook)
 986     return;
 987
 988   croak ("unrequest_sigio");
 989 }
 990
 991 #endif /* MSDOS */
 992 #endif /* FASYNC */
 993 #endif /* F_SETFL */
 994 #endif /* SIGIO */
 995 \f
 996 /* Saving and restoring the process group of Emacs's terminal.  */
 997
 998 #ifdef BSD_PGRPS
 999
1000 /* The process group of which Emacs was a member when it initially
1001    started.
1002
1003    If Emacs was in its own process group (i.e. inherited_pgroup ==
1004    getpid ()), then we know we're running under a shell with job
1005    control (Emacs would never be run as part of a pipeline).
1006    Everything is fine.
1007
1008    If Emacs was not in its own process group, then we know we're
1009    running under a shell (or a caller) that doesn't know how to
1010    separate itself from Emacs (like sh).  Emacs must be in its own
1011    process group in order to receive SIGIO correctly.  In this
1012    situation, we put ourselves in our own pgroup, forcibly set the
1013    tty's pgroup to our pgroup, and make sure to restore and reinstate
1014    the tty's pgroup just like any other terminal setting.  If
1015    inherited_group was not the tty's pgroup, then we'll get a
1016    SIGTTmumble when we try to change the tty's pgroup, and a CONT if
1017    it goes foreground in the future, which is what should happen.
1018
1019    This variable is initialized in emacs.c.  */
1020 int inherited_pgroup;
1021
1022 /* Split off the foreground process group to Emacs alone.  When we are
1023    in the foreground, but not started in our own process group,
1024    redirect the tty device handle FD to point to our own process
1025    group.  We need to be in our own process group to receive SIGIO
1026    properly.  */
1027 static void
1028 narrow_foreground_group (int fd)
1029 {
1030   int me = getpid ();
1031
1032   setpgrp (0, inherited_pgroup);
1033 #if 0
1034   /* XXX inherited_pgroup should not be zero here, but GTK seems to
1035      mess this up. */
1036   if (! inherited_pgroup)
1037     abort ();                   /* Should not happen. */
1038 #endif
1039   if (inherited_pgroup != me)
1040       EMACS_SET_TTY_PGRP (fd, &me); /* XXX This only works on the controlling tty. */
1041   setpgrp (0, me);
1042 }
1043
1044 /* Set the tty to our original foreground group.  */
1045 static void
1046 widen_foreground_group (int fd)
1047 {
1048   if (inherited_pgroup != getpid ())
1049     EMACS_SET_TTY_PGRP (fd, &inherited_pgroup);
1050   setpgrp (0, inherited_pgroup);
1051 }
1052
1053 #endif /* BSD_PGRPS */
1054 \f
1055 /* Getting and setting emacs_tty structures.  */
1056
1057 /* Set *TC to the parameters associated with the terminal FD.
1058    Return zero if all's well, or -1 if we ran into an error we
1059    couldn't deal with.  */
1060 int
1061 emacs_get_tty (fd, settings)
1062      int fd;
1063      struct emacs_tty *settings;
1064 {
1065   /* Retrieve the primary parameters - baud rate, character size, etcetera.  */
1066 #ifdef HAVE_TCATTR
1067   /* We have those nifty POSIX tcmumbleattr functions.  */
1068   bzero (&settings->main, sizeof (settings->main));
1069   if (tcgetattr (fd, &settings->main) < 0)
1070     return -1;
1071
1072 #else
1073 #ifdef HAVE_TERMIO
1074   /* The SYSV-style interface?  */
1075   if (ioctl (fd, TCGETA, &settings->main) < 0)
1076     return -1;
1077
1078 #else
1079 #ifdef VMS
1080   /* Vehemently Monstrous System?  :-)  */
1081   if (! (SYS$QIOW (0, fd, IO$_SENSEMODE, settings, 0, 0,
1082                    &settings->main.class, 12, 0, 0, 0, 0)
1083          & 1))
1084     return -1;
1085
1086 #else
1087 #ifndef DOS_NT
1088   /* I give up - I hope you have the BSD ioctls.  */
1089   if (ioctl (fd, TIOCGETP, &settings->main) < 0)
1090     return -1;
1091 #endif /* not DOS_NT */
1092 #endif
1093 #endif
1094 #endif
1095
1096   /* Suivant - Do we have to get struct ltchars data?  */
1097 #ifdef HAVE_LTCHARS
1098   if (ioctl (fd, TIOCGLTC, &settings->ltchars) < 0)
1099     return -1;
1100 #endif
1101
1102   /* How about a struct tchars and a wordful of lmode bits?  */
1103 #ifdef HAVE_TCHARS
1104   if (ioctl (fd, TIOCGETC, &settings->tchars) < 0
1105       || ioctl (fd, TIOCLGET, &settings->lmode) < 0)
1106     return -1;
1107 #endif
1108
1109   /* We have survived the tempest.  */
1110   return 0;
1111 }
1112
1113
1114 /* Set the parameters of the tty on FD according to the contents of
1115    *SETTINGS.  If FLUSHP is non-zero, we discard input.
1116    Return 0 if all went well, and -1 if anything failed.  */
1117
1118 int
1119 emacs_set_tty (fd, settings, flushp)
1120      int fd;
1121      struct emacs_tty *settings;
1122      int flushp;
1123 {
1124   /* Set the primary parameters - baud rate, character size, etcetera.  */
1125 #ifdef HAVE_TCATTR
1126   int i;
1127   /* We have those nifty POSIX tcmumbleattr functions.
1128      William J. Smith <wjs@wiis.wang.com> writes:
1129      "POSIX 1003.1 defines tcsetattr to return success if it was
1130      able to perform any of the requested actions, even if some
1131      of the requested actions could not be performed.
1132      We must read settings back to ensure tty setup properly.
1133      AIX requires this to keep tty from hanging occasionally."  */
1134   /* This make sure that we don't loop indefinitely in here.  */
1135   for (i = 0 ; i < 10 ; i++)
1136     if (tcsetattr (fd, flushp ? TCSAFLUSH : TCSADRAIN, &settings->main) < 0)
1137       {
1138         if (errno == EINTR)
1139           continue;
1140         else
1141           return -1;
1142       }
1143     else
1144       {
1145         struct termios new;
1146
1147         bzero (&new, sizeof (new));
1148         /* Get the current settings, and see if they're what we asked for.  */
1149         tcgetattr (fd, &new);
1150         /* We cannot use memcmp on the whole structure here because under
1151          * aix386 the termios structure has some reserved field that may
1152          * not be filled in.
1153          */
1154         if (   new.c_iflag == settings->main.c_iflag
1155             && new.c_oflag == settings->main.c_oflag
1156             && new.c_cflag == settings->main.c_cflag
1157             && new.c_lflag == settings->main.c_lflag
1158             && memcmp (new.c_cc, settings->main.c_cc, NCCS) == 0)
1159           break;
1160         else
1161           continue;
1162       }
1163
1164 #else
1165 #ifdef HAVE_TERMIO
1166   /* The SYSV-style interface?  */
1167   if (ioctl (fd, flushp ? TCSETAF : TCSETAW, &settings->main) < 0)
1168     return -1;
1169
1170 #else
1171 #ifdef VMS
1172   /* Vehemently Monstrous System?  :-)  */
1173   if (! (SYS$QIOW (0, fd, IO$_SETMODE, &input_iosb, 0, 0,
1174                    &settings->main.class, 12, 0, 0, 0, 0)
1175          & 1))
1176     return -1;
1177
1178 #else
1179 #ifndef DOS_NT
1180   /* I give up - I hope you have the BSD ioctls.  */
1181   if (ioctl (fd, (flushp) ? TIOCSETP : TIOCSETN, &settings->main) < 0)
1182     return -1;
1183 #endif /* not DOS_NT */
1184
1185 #endif
1186 #endif
1187 #endif
1188
1189   /* Suivant - Do we have to get struct ltchars data?  */
1190 #ifdef HAVE_LTCHARS
1191   if (ioctl (fd, TIOCSLTC, &settings->ltchars) < 0)
1192     return -1;
1193 #endif
1194
1195   /* How about a struct tchars and a wordful of lmode bits?  */
1196 #ifdef HAVE_TCHARS
1197   if (ioctl (fd, TIOCSETC, &settings->tchars) < 0
1198       || ioctl (fd, TIOCLSET, &settings->lmode) < 0)
1199     return -1;
1200 #endif
1201
1202   /* We have survived the tempest.  */
1203   return 0;
1204 }
1205
1206 \f
1207
1208 #ifdef F_SETOWN
1209 int old_fcntl_owner[MAXDESC];
1210 #endif /* F_SETOWN */
1211
1212 /* This may also be defined in stdio,
1213    but if so, this does no harm,
1214    and using the same name avoids wasting the other one's space.  */
1215
1216 #if defined (USG) || defined (DGUX)
1217 unsigned char _sobuf[BUFSIZ+8];
1218 #else
1219 char _sobuf[BUFSIZ];
1220 #endif
1221
1222 #ifdef HAVE_LTCHARS
1223 static struct ltchars new_ltchars = {-1,-1,-1,-1,-1,-1};
1224 #endif
1225 #ifdef HAVE_TCHARS
1226 static struct tchars new_tchars = {-1,-1,-1,-1,-1,-1};
1227 #endif
1228
1229 /* Initialize the terminal mode on all tty devices that are currently
1230    open. */
1231
1232 void
1233 init_all_sys_modes (void)
1234 {
1235   struct tty_display_info *tty;
1236   for (tty = tty_list; tty; tty = tty->next)
1237     init_sys_modes (tty);
1238 }
1239
1240 /* Initialize the terminal mode on the given tty device. */
1241
1242 void
1243 init_sys_modes (tty_out)
1244      struct tty_display_info *tty_out;
1245 {
1246   struct emacs_tty tty;
1247
1248   Vtty_erase_char = Qnil;
1249
1250   if (noninteractive)
1251     return;
1252
1253   if (!tty_out->output)
1254     return;                     /* The tty is suspended. */
1255
1256 #ifdef VMS
1257   if (!input_ef)
1258     input_ef = get_kbd_event_flag ();
1259     /* LIB$GET_EF (&input_ef); */
1260   SYS$CLREF (input_ef);
1261   waiting_for_ast = 0;
1262   if (!timer_ef)
1263     timer_ef = get_timer_event_flag ();
1264     /* LIB$GET_EF (&timer_ef); */
1265   SYS$CLREF (timer_ef);
1266   if (input_ef / 32 != timer_ef / 32)
1267     croak ("Input and timer event flags in different clusters.");
1268   timer_eflist = ((unsigned) 1 << (input_ef % 32)) |
1269     ((unsigned) 1 << (timer_ef % 32));
1270 #ifndef VMS4_4
1271   sys_access_reinit ();
1272 #endif
1273 #endif /* VMS */
1274
1275 #ifdef BSD_PGRPS
1276 #if 0
1277   /* read_socket_hook is not global anymore.  I think doing this
1278      unconditionally will not cause any problems. */
1279   if (! read_socket_hook && EQ (Vinitial_window_system, Qnil))
1280 #endif
1281     narrow_foreground_group (fileno (tty_out->input));
1282 #endif
1283
1284   if (! tty_out->old_tty)
1285     tty_out->old_tty = (struct emacs_tty *) xmalloc (sizeof (struct emacs_tty));
1286
1287   EMACS_GET_TTY (fileno (tty_out->input), tty_out->old_tty);
1288
1289   tty = *tty_out->old_tty;
1290
1291 #if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
1292   XSETINT (Vtty_erase_char, tty.main.c_cc[VERASE]);
1293
1294   tty.main.c_iflag |= (IGNBRK); /* Ignore break condition */
1295   tty.main.c_iflag &= ~ICRNL;   /* Disable map of CR to NL on input */
1296 #ifdef INLCR  /* I'm just being cautious,
1297                  since I can't check how widespread INLCR is--rms.  */
1298   tty.main.c_iflag &= ~INLCR;   /* Disable map of NL to CR on input */
1299 #endif
1300 #ifdef ISTRIP
1301   tty.main.c_iflag &= ~ISTRIP;  /* don't strip 8th bit on input */
1302 #endif
1303   tty.main.c_lflag &= ~ECHO;    /* Disable echo */
1304   tty.main.c_lflag &= ~ICANON;  /* Disable erase/kill processing */
1305 #ifdef IEXTEN
1306   tty.main.c_lflag &= ~IEXTEN;  /* Disable other editing characters.  */
1307 #endif
1308   tty.main.c_lflag |= ISIG;     /* Enable signals */
1309   if (tty_out->flow_control)
1310     {
1311       tty.main.c_iflag |= IXON; /* Enable start/stop output control */
1312 #ifdef IXANY
1313       tty.main.c_iflag &= ~IXANY;
1314 #endif /* IXANY */
1315     }
1316   else
1317     tty.main.c_iflag &= ~IXON;  /* Disable start/stop output control */
1318   tty.main.c_oflag &= ~ONLCR;   /* Disable map of NL to CR-NL
1319                                    on output */
1320   tty.main.c_oflag &= ~TAB3;    /* Disable tab expansion */
1321 #ifdef CS8
1322   if (tty_out->meta_key)
1323     {
1324       tty.main.c_cflag |= CS8;  /* allow 8th bit on input */
1325       tty.main.c_cflag &= ~PARENB;/* Don't check parity */
1326     }
1327 #endif
1328   if (tty_out->input == stdin)
1329     {
1330       tty.main.c_cc[VINTR] = quit_char; /* C-g (usually) gives SIGINT */
1331       /* Set up C-g for both SIGQUIT and SIGINT.
1332          We don't know which we will get, but we handle both alike
1333          so which one it really gives us does not matter.  */
1334       tty.main.c_cc[VQUIT] = quit_char;
1335     }
1336   else
1337     {
1338       /* We normally don't get interrupt or quit signals from tty
1339          devices other than our controlling terminal; therefore,
1340          we must handle C-g as normal input.  Unfortunately, this
1341          means that the interrupt and quit feature must be
1342          disabled on secondary ttys, or we would not even see the
1343          keypress.
1344
1345          Note that even though emacsclient could have special code
1346          to pass SIGINT to Emacs, we should _not_ enable
1347          interrupt/quit keys for emacsclient frames.  This means
1348          that we can't break out of loops in C code from a
1349          secondary tty frame, but we can always decide what
1350          display the C-g came from, which is more important from a
1351          usability point of view.  (Consider the case when two
1352          people work together using the same Emacs instance.)  */
1353       tty.main.c_cc[VINTR] = CDISABLE;
1354       tty.main.c_cc[VQUIT] = CDISABLE;
1355     }
1356   tty.main.c_cc[VMIN] = 1;      /* Input should wait for at least 1 char */
1357   tty.main.c_cc[VTIME] = 0;     /* no matter how long that takes.  */
1358 #ifdef VSWTCH
1359   tty.main.c_cc[VSWTCH] = CDISABLE;     /* Turn off shell layering use
1360                                            of C-z */
1361 #endif /* VSWTCH */
1362
1363 #if defined (__mips__) || defined (HAVE_TCATTR)
1364 #ifdef VSUSP
1365   tty.main.c_cc[VSUSP] = CDISABLE;      /* Turn off mips handling of C-z.  */
1366 #endif /* VSUSP */
1367 #ifdef V_DSUSP
1368   tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off mips handling of C-y.  */
1369 #endif /* V_DSUSP */
1370 #ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP.  */
1371   tty.main.c_cc[VDSUSP] = CDISABLE;
1372 #endif /* VDSUSP */
1373 #ifdef VLNEXT
1374   tty.main.c_cc[VLNEXT] = CDISABLE;
1375 #endif /* VLNEXT */
1376 #ifdef VREPRINT
1377   tty.main.c_cc[VREPRINT] = CDISABLE;
1378 #endif /* VREPRINT */
1379 #ifdef VWERASE
1380   tty.main.c_cc[VWERASE] = CDISABLE;
1381 #endif /* VWERASE */
1382 #ifdef VDISCARD
1383   tty.main.c_cc[VDISCARD] = CDISABLE;
1384 #endif /* VDISCARD */
1385
1386   if (tty_out->flow_control)
1387     {
1388 #ifdef VSTART
1389       tty.main.c_cc[VSTART] = '\021';
1390 #endif /* VSTART */
1391 #ifdef VSTOP
1392       tty.main.c_cc[VSTOP] = '\023';
1393 #endif /* VSTOP */
1394     }
1395   else
1396     {
1397 #ifdef VSTART
1398       tty.main.c_cc[VSTART] = CDISABLE;
1399 #endif /* VSTART */
1400 #ifdef VSTOP
1401       tty.main.c_cc[VSTOP] = CDISABLE;
1402 #endif /* VSTOP */
1403     }
1404 #endif /* mips or HAVE_TCATTR */
1405
1406 #ifdef AIX
1407 #ifndef IBMR2AIX
1408   /* AIX enhanced edit loses NULs, so disable it.  */
1409   tty.main.c_line = 0;
1410   tty.main.c_iflag &= ~ASCEDIT;
1411 #else
1412   tty.main.c_cc[VSTRT] = CDISABLE;
1413   tty.main.c_cc[VSTOP] = CDISABLE;
1414   tty.main.c_cc[VSUSP] = CDISABLE;
1415   tty.main.c_cc[VDSUSP] = CDISABLE;
1416 #endif /* IBMR2AIX */
1417   if (tty_out->flow_control)
1418     {
1419 #ifdef VSTART
1420       tty.main.c_cc[VSTART] = '\021';
1421 #endif /* VSTART */
1422 #ifdef VSTOP
1423       tty.main.c_cc[VSTOP] = '\023';
1424 #endif /* VSTOP */
1425     }
1426   /* Also, PTY overloads NUL and BREAK.
1427      don't ignore break, but don't signal either, so it looks like NUL.
1428      This really serves a purpose only if running in an XTERM window
1429      or via TELNET or the like, but does no harm elsewhere.  */
1430   tty.main.c_iflag &= ~IGNBRK;
1431   tty.main.c_iflag &= ~BRKINT;
1432 #endif
1433 #else /* if not HAVE_TERMIO */
1434 #ifdef VMS
1435   tty.main.tt_char |= TT$M_NOECHO;
1436   if (meta_key)
1437     tty.main.tt_char |= TT$M_EIGHTBIT;
1438   if (tty_out->flow_control)
1439     tty.main.tt_char |= TT$M_TTSYNC;
1440   else
1441     tty.main.tt_char &= ~TT$M_TTSYNC;
1442   tty.main.tt2_char |= TT2$M_PASTHRU | TT2$M_XON;
1443 #else /* not VMS (BSD, that is) */
1444 #ifndef DOS_NT
1445   XSETINT (Vtty_erase_char, tty.main.sg_erase);
1446   tty.main.sg_flags &= ~(ECHO | CRMOD | XTABS);
1447   if (meta_key)
1448     tty.main.sg_flags |= ANYP;
1449   tty.main.sg_flags |= interrupt_input ? RAW : CBREAK;
1450 #endif /* not DOS_NT */
1451 #endif /* not VMS (BSD, that is) */
1452 #endif /* not HAVE_TERMIO */
1453
1454   /* If going to use CBREAK mode, we must request C-g to interrupt
1455      and turn off start and stop chars, etc.  If not going to use
1456      CBREAK mode, do this anyway so as to turn off local flow
1457      control for user coming over network on 4.2; in this case,
1458      only t_stopc and t_startc really matter.  */
1459 #ifndef HAVE_TERMIO
1460 #ifdef HAVE_TCHARS
1461   /* Note: if not using CBREAK mode, it makes no difference how we
1462      set this */
1463   tty.tchars = new_tchars;
1464   tty.tchars.t_intrc = quit_char;
1465   if (tty_out->flow_control)
1466     {
1467       tty.tchars.t_startc = '\021';
1468       tty.tchars.t_stopc = '\023';
1469     }
1470
1471   tty.lmode = LDECCTQ | LLITOUT | LPASS8 | LNOFLSH | tty_out->old_tty.lmode;
1472
1473 #endif /* HAVE_TCHARS */
1474 #endif /* not HAVE_TERMIO */
1475
1476 #ifdef HAVE_LTCHARS
1477   tty.ltchars = new_ltchars;
1478 #endif /* HAVE_LTCHARS */
1479 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
1480   if (!tty_out->term_initted)
1481     internal_terminal_init ();
1482   dos_ttraw ();
1483 #endif
1484
1485   EMACS_SET_TTY (fileno (tty_out->input), &tty, 0);
1486
1487   /* This code added to insure that, if flow-control is not to be used,
1488      we have an unlocked terminal at the start. */
1489
1490 #ifdef TCXONC
1491   if (!tty_out->flow_control) ioctl (fileno (tty_out->input), TCXONC, 1);
1492 #endif
1493 #ifdef TIOCSTART
1494   if (!tty_out->flow_control) ioctl (fileno (tty_out->input), TIOCSTART, 0);
1495 #endif
1496
1497 #if defined (HAVE_TERMIOS) || defined (HPUX)
1498 #ifdef TCOON
1499   if (!tty_out->flow_control) tcflow (fileno (tty_out->input), TCOON);
1500 #endif
1501 #endif
1502
1503 #ifdef VMS
1504 /*  Appears to do nothing when in PASTHRU mode.
1505       SYS$QIOW (0, fileno (tty_out->input), IO$_SETMODE|IO$M_OUTBAND, 0, 0, 0,
1506                 interrupt_signal, oob_chars, 0, 0, 0, 0);
1507 */
1508   queue_kbd_input (0);
1509 #endif /* VMS */
1510
1511 #ifdef F_SETFL
1512 #ifdef F_GETOWN         /* F_SETFL does not imply existence of F_GETOWN */
1513   if (interrupt_input)
1514     {
1515       old_fcntl_owner[fileno (tty_out->input)] =
1516         fcntl (fileno (tty_out->input), F_GETOWN, 0);
1517       fcntl (fileno (tty_out->input), F_SETOWN, getpid ());
1518       init_sigio (fileno (tty_out->input));
1519 #ifdef HAVE_GPM
1520       if (gpm_tty == tty_out)
1521         {
1522           /* Arrange for mouse events to give us SIGIO signals.  */
1523           fcntl (gpm_fd, F_SETOWN, getpid ());
1524           fcntl (gpm_fd, F_SETFL, fcntl (gpm_fd, F_GETFL, 0) | O_NONBLOCK);
1525           init_sigio (gpm_fd);
1526         }
1527 #endif /* HAVE_GPM */
1528     }
1529 #endif /* F_GETOWN */
1530 #endif /* F_SETFL */
1531
1532 #ifdef VMS  /* VMS sometimes has this symbol but lacks setvbuf.  */
1533 #undef _IOFBF
1534 #endif
1535 #ifdef _IOFBF
1536   /* This symbol is defined on recent USG systems.
1537      Someone says without this call USG won't really buffer the file
1538      even with a call to setbuf. */
1539   setvbuf (tty_out->output, (char *) _sobuf, _IOFBF, sizeof _sobuf);
1540 #else
1541   setbuf (tty_out->output, (char *) _sobuf);
1542 #endif
1543
1544   if (tty_out->terminal->set_terminal_modes_hook)
1545     tty_out->terminal->set_terminal_modes_hook (tty_out->terminal);
1546
1547   if (!tty_out->term_initted)
1548     {
1549       Lisp_Object tail, frame;
1550       FOR_EACH_FRAME (tail, frame)
1551         {
1552           /* XXX This needs to be revised. */
1553           if (FRAME_TERMCAP_P (XFRAME (frame))
1554               && FRAME_TTY (XFRAME (frame)) == tty_out)
1555             init_frame_faces (XFRAME (frame));
1556         }
1557     }
1558
1559   if (tty_out->term_initted && no_redraw_on_reenter)
1560     {
1561       /* XXX This seems wrong on multi-tty. */
1562       if (display_completed)
1563         direct_output_forward_char (0);
1564     }
1565   else
1566     {
1567       Lisp_Object tail, frame;
1568       frame_garbaged = 1;
1569       FOR_EACH_FRAME (tail, frame)
1570         {
1571           if (FRAME_TERMCAP_P (XFRAME (frame))
1572               && FRAME_TTY (XFRAME (frame)) == tty_out)
1573             FRAME_GARBAGED_P (XFRAME (frame)) = 1;
1574         }
1575     }
1576
1577   tty_out->term_initted = 1;
1578 }
1579
1580 /* Return nonzero if safe to use tabs in output.
1581    At the time this is called, init_sys_modes has not been done yet.  */
1582
1583 int
1584 tabs_safe_p (int fd)
1585 {
1586   struct emacs_tty etty;
1587
1588   EMACS_GET_TTY (fd, &etty);
1589   return EMACS_TTY_TABS_OK (&etty);
1590 }
1591 \f
1592 /* Get terminal size from system.
1593    Store number of lines into *HEIGHTP and width into *WIDTHP.
1594    We store 0 if there's no valid information.  */
1595
1596 void
1597 get_tty_size (int fd, int *widthp, int *heightp)
1598 {
1599
1600 #ifdef TIOCGWINSZ
1601
1602   /* BSD-style.  */
1603   struct winsize size;
1604
1605   if (ioctl (fd, TIOCGWINSZ, &size) == -1)
1606     *widthp = *heightp = 0;
1607   else
1608     {
1609       *widthp = size.ws_col;
1610       *heightp = size.ws_row;
1611     }
1612
1613 #else
1614 #ifdef TIOCGSIZE
1615
1616   /* SunOS - style.  */
1617   struct ttysize size;
1618
1619   if (ioctl (fd, TIOCGSIZE, &size) == -1)
1620     *widthp = *heightp = 0;
1621   else
1622     {
1623       *widthp = size.ts_cols;
1624       *heightp = size.ts_lines;
1625     }
1626
1627 #else
1628 #ifdef VMS
1629
1630   /* Use a fresh channel since the current one may have stale info
1631      (for example, from prior to a suspend); and to avoid a dependency
1632      in the init sequence.  */
1633   int chan;
1634   struct sensemode tty;
1635
1636   SYS$ASSIGN (&input_dsc, &chan, 0, 0);
1637   SYS$QIOW (0, chan, IO$_SENSEMODE, &tty, 0, 0,
1638             &tty.class, 12, 0, 0, 0, 0);
1639   SYS$DASSGN (chan);
1640   *widthp = tty.scr_wid;
1641   *heightp = tty.scr_len;
1642
1643 #else
1644 #ifdef MSDOS
1645   *widthp = ScreenCols ();
1646   *heightp = ScreenRows ();
1647 #else /* system doesn't know size */
1648   *widthp = 0;
1649   *heightp = 0;
1650 #endif
1651 #endif /* not VMS */
1652 #endif /* not SunOS-style */
1653 #endif /* not BSD-style */
1654 }
1655
1656 /* Set the logical window size associated with descriptor FD
1657    to HEIGHT and WIDTH.  This is used mainly with ptys.  */
1658
1659 int
1660 set_window_size (fd, height, width)
1661      int fd, height, width;
1662 {
1663 #ifdef TIOCSWINSZ
1664
1665   /* BSD-style.  */
1666   struct winsize size;
1667   size.ws_row = height;
1668   size.ws_col = width;
1669
1670   if (ioctl (fd, TIOCSWINSZ, &size) == -1)
1671     return 0; /* error */
1672   else
1673     return 1;
1674
1675 #else
1676 #ifdef TIOCSSIZE
1677
1678   /* SunOS - style.  */
1679   struct ttysize size;
1680   size.ts_lines = height;
1681   size.ts_cols = width;
1682
1683   if (ioctl (fd, TIOCGSIZE, &size) == -1)
1684     return 0;
1685   else
1686     return 1;
1687 #else
1688   return -1;
1689 #endif /* not SunOS-style */
1690 #endif /* not BSD-style */
1691 }
1692
1693 \f
1694
1695 /* Prepare all terminal devices for exiting Emacs. */
1696
1697 void
1698 reset_all_sys_modes (void)
1699 {
1700   struct tty_display_info *tty;
1701   for (tty = tty_list; tty; tty = tty->next)
1702     reset_sys_modes (tty);
1703 }
1704
1705 /* Prepare the terminal for closing it; move the cursor to the
1706    bottom of the frame, turn off interrupt-driven I/O, etc.  */
1707
1708 void
1709 reset_sys_modes (tty_out)
1710      struct tty_display_info *tty_out;
1711 {
1712   if (noninteractive)
1713     {
1714       fflush (stdout);
1715       return;
1716     }
1717   if (!tty_out->term_initted)
1718     return;
1719
1720   if (!tty_out->output)
1721     return;                     /* The tty is suspended. */
1722
1723   /* Go to and clear the last line of the terminal. */
1724
1725   cmgoto (tty_out, FrameRows (tty_out) - 1, 0);
1726
1727   /* Code adapted from tty_clear_end_of_line. */
1728   if (tty_out->TS_clr_line)
1729     {
1730       emacs_tputs (tty_out, tty_out->TS_clr_line, 1, cmputc);
1731     }
1732   else
1733     {                   /* have to do it the hard way */
1734       int i;
1735       tty_turn_off_insert (tty_out);
1736
1737       for (i = curX (tty_out); i < FrameCols (tty_out) - 1; i++)
1738         {
1739           fputc (' ', tty_out->output);
1740         }
1741     }
1742
1743   cmgoto (tty_out, FrameRows (tty_out) - 1, 0);
1744   fflush (tty_out->output);
1745
1746   if (tty_out->terminal->reset_terminal_modes_hook)
1747     tty_out->terminal->reset_terminal_modes_hook (tty_out->terminal);
1748
1749 #ifdef BSD_SYSTEM
1750   /* Avoid possible loss of output when changing terminal modes.  */
1751   fsync (fileno (tty_out->output));
1752 #endif
1753
1754 #ifdef F_SETFL
1755 #ifdef F_SETOWN         /* F_SETFL does not imply existence of F_SETOWN */
1756   if (interrupt_input)
1757     {
1758       reset_sigio (fileno (tty_out->input));
1759       fcntl (fileno (tty_out->input), F_SETOWN,
1760              old_fcntl_owner[fileno (tty_out->input)]);
1761     }
1762 #endif /* F_SETOWN */
1763 #ifdef O_NDELAY
1764   fcntl (fileno (tty_out->input), F_SETFL,
1765          fcntl (fileno (tty_out->input), F_GETFL, 0) & ~O_NDELAY);
1766 #endif
1767 #endif /* F_SETFL */
1768
1769   if (tty_out->old_tty)
1770     while (EMACS_SET_TTY (fileno (tty_out->input),
1771                           tty_out->old_tty, 0) < 0 && errno == EINTR)
1772       ;
1773
1774 #ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
1775   dos_ttcooked ();
1776 #endif
1777
1778 #ifdef BSD_PGRPS
1779   widen_foreground_group (fileno (tty_out->input));
1780 #endif
1781 }
1782 \f
1783 #ifdef HAVE_PTYS
1784
1785 /* Set up the proper status flags for use of a pty.  */
1786
1787 void
1788 setup_pty (fd)
1789      int fd;
1790 {
1791   /* I'm told that TOICREMOTE does not mean control chars
1792      "can't be sent" but rather that they don't have
1793      input-editing or signaling effects.
1794      That should be good, because we have other ways
1795      to do those things in Emacs.
1796      However, telnet mode seems not to work on 4.2.
1797      So TIOCREMOTE is turned off now. */
1798
1799   /* Under hp-ux, if TIOCREMOTE is turned on, some calls
1800      will hang.  In particular, the "timeout" feature (which
1801      causes a read to return if there is no data available)
1802      does this.  Also it is known that telnet mode will hang
1803      in such a way that Emacs must be stopped (perhaps this
1804      is the same problem).
1805
1806      If TIOCREMOTE is turned off, then there is a bug in
1807      hp-ux which sometimes loses data.  Apparently the
1808      code which blocks the master process when the internal
1809      buffer fills up does not work.  Other than this,
1810      though, everything else seems to work fine.
1811
1812      Since the latter lossage is more benign, we may as well
1813      lose that way.  -- cph */
1814 #ifdef FIONBIO
1815 #if defined(UNIX98_PTYS)
1816   {
1817     int on = 1;
1818     ioctl (fd, FIONBIO, &on);
1819   }
1820 #endif
1821 #endif
1822 }
1823 #endif /* HAVE_PTYS */
1824 \f
1825 #ifdef VMS
1826
1827 /* Assigning an input channel is done at the start of Emacs execution.
1828    This is called each time Emacs is resumed, also, but does nothing
1829    because input_chain is no longer zero.  */
1830
1831 void
1832 init_vms_input ()
1833 {
1834   int status;
1835
1836   if (fileno (CURTTY ()->input)) == 0)
1837     {
1838       status = SYS$ASSIGN (&input_dsc, &fileno (CURTTY ()->input)), 0, 0);
1839       if (! (status & 1))
1840         LIB$STOP (status);
1841     }
1842 }
1843
1844 /* Deassigning the input channel is done before exiting.  */
1845
1846 void
1847 stop_vms_input ()
1848 {
1849   return SYS$DASSGN (fileno (CURTTY ()->input)));
1850 }
1851
1852 short input_buffer;
1853
1854 /* Request reading one character into the keyboard buffer.
1855    This is done as soon as the buffer becomes empty.  */
1856
1857 void
1858 queue_kbd_input ()
1859 {
1860   int status;
1861   extern kbd_input_ast ();
1862
1863   waiting_for_ast = 0;
1864   stop_input = 0;
1865   status = SYS$QIO (0, fileno (CURTTY()->input), IO$_READVBLK,
1866                     &input_iosb, kbd_input_ast, 1,
1867                     &input_buffer, 1, 0, terminator_mask, 0, 0);
1868 }
1869
1870 int input_count;
1871
1872 /* Ast routine that is called when keyboard input comes in
1873    in accord with the SYS$QIO above.  */
1874
1875 void
1876 kbd_input_ast ()
1877 {
1878   register int c = -1;
1879   int old_errno = errno;
1880   extern EMACS_TIME *input_available_clear_time;
1881
1882   if (waiting_for_ast)
1883     SYS$SETEF (input_ef);
1884   waiting_for_ast = 0;
1885   input_count++;
1886 #ifdef ASTDEBUG
1887   if (input_count == 25)
1888     exit (1);
1889   printf ("Ast # %d,", input_count);
1890   printf (" iosb = %x, %x, %x, %x",
1891           input_iosb.offset, input_iosb.status, input_iosb.termlen,
1892           input_iosb.term);
1893 #endif
1894   if (input_iosb.offset)
1895     {
1896       c = input_buffer;
1897 #ifdef ASTDEBUG
1898       printf (", char = 0%o", c);
1899 #endif
1900     }
1901 #ifdef ASTDEBUG
1902   printf ("\n");
1903   fflush (stdout);
1904   sleep (1);
1905 #endif
1906   if (! stop_input)
1907     queue_kbd_input ();
1908   if (c >= 0)
1909     {
1910       struct input_event e;
1911       EVENT_INIT (e);
1912
1913       e.kind = ASCII_KEYSTROKE_EVENT;
1914       XSETINT (e.code, c);
1915       e.frame_or_window = selected_frame;
1916       kbd_buffer_store_event (&e);
1917     }
1918   if (input_available_clear_time)
1919     EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
1920   errno = old_errno;
1921 }
1922
1923 /* Wait until there is something in kbd_buffer.  */
1924
1925 void
1926 wait_for_kbd_input ()
1927 {
1928   extern int have_process_input, process_exited;
1929
1930   /* If already something, avoid doing system calls.  */
1931   if (detect_input_pending ())
1932     {
1933       return;
1934     }
1935   /* Clear a flag, and tell ast routine above to set it.  */
1936   SYS$CLREF (input_ef);
1937   waiting_for_ast = 1;
1938   /* Check for timing error: ast happened while we were doing that.  */
1939   if (!detect_input_pending ())
1940     {
1941       /* No timing error: wait for flag to be set.  */
1942       set_waiting_for_input (0);
1943       SYS$WFLOR (input_ef, input_eflist);
1944       clear_waiting_for_input ();
1945       if (!detect_input_pending ())
1946         /* Check for subprocess input availability */
1947         {
1948           int dsp = have_process_input || process_exited;
1949
1950           SYS$CLREF (process_ef);
1951           if (have_process_input)
1952             process_command_input ();
1953           if (process_exited)
1954             process_exit ();
1955           if (dsp)
1956             {
1957               update_mode_lines++;
1958               prepare_menu_bars ();
1959               redisplay_preserve_echo_area (18);
1960             }
1961         }
1962     }
1963   waiting_for_ast = 0;
1964 }
1965
1966 /* Get rid of any pending QIO, when we are about to suspend
1967    or when we want to throw away pending input.
1968    We wait for a positive sign that the AST routine has run
1969    and therefore there is no I/O request queued when we return.
1970    SYS$SETAST is used to avoid a timing error.  */
1971
1972 void
1973 end_kbd_input ()
1974 {
1975 #ifdef ASTDEBUG
1976   printf ("At end_kbd_input.\n");
1977   fflush (stdout);
1978   sleep (1);
1979 #endif
1980   if (LIB$AST_IN_PROG ())  /* Don't wait if suspending from kbd_buffer_store_event! */
1981     {
1982       SYS$CANCEL (fileno (CURTTY()->input));
1983       return;
1984     }
1985
1986   SYS$SETAST (0);
1987   /* Clear a flag, and tell ast routine above to set it.  */
1988   SYS$CLREF (input_ef);
1989   waiting_for_ast = 1;
1990   stop_input = 1;
1991   SYS$CANCEL (fileno (CURTTY()->input));
1992   SYS$SETAST (1);
1993   SYS$WAITFR (input_ef);
1994   waiting_for_ast = 0;
1995 }
1996
1997 /* Wait for either input available or time interval expiry.  */
1998
1999 void
2000 input_wait_timeout (timeval)
2001      int timeval;               /* Time to wait, in seconds */
2002 {
2003   int time [2];
2004   static int zero = 0;
2005   static int large = -10000000;
2006
2007   LIB$EMUL (&timeval, &large, &zero, time);       /* Convert to VMS format */
2008
2009   /* If already something, avoid doing system calls.  */
2010   if (detect_input_pending ())
2011     {
2012       return;
2013     }
2014   /* Clear a flag, and tell ast routine above to set it.  */
2015   SYS$CLREF (input_ef);
2016   waiting_for_ast = 1;
2017   /* Check for timing error: ast happened while we were doing that.  */
2018   if (!detect_input_pending ())
2019     {
2020       /* No timing error: wait for flag to be set.  */
2021       SYS$CANTIM (1, 0);
2022       if (SYS$SETIMR (timer_ef, time, 0, 1) & 1) /* Set timer */
2023         SYS$WFLOR (timer_ef, timer_eflist);       /* Wait for timer expiry or input */
2024     }
2025   waiting_for_ast = 0;
2026 }
2027
2028 /* The standard `sleep' routine works some other way
2029    and it stops working if you have ever quit out of it.
2030    This one continues to work.  */
2031
2032 sys_sleep (timeval)
2033      int timeval;
2034 {
2035   int time [2];
2036   static int zero = 0;
2037   static int large = -10000000;
2038
2039   LIB$EMUL (&timeval, &large, &zero, time);       /* Convert to VMS format */
2040
2041   SYS$CANTIM (1, 0);
2042   if (SYS$SETIMR (timer_ef, time, 0, 1) & 1) /* Set timer */
2043     SYS$WAITFR (timer_ef);        /* Wait for timer expiry only */
2044 }
2045
2046 void
2047 init_sigio (fd)
2048      int fd;
2049 {
2050   request_sigio ();
2051 }
2052
2053 reset_sigio (fd)
2054      int fd;
2055 {
2056   unrequest_sigio ();
2057 }
2058
2059 void
2060 request_sigio ()
2061 {
2062   if (noninteractive)
2063     return;
2064   croak ("request sigio");
2065 }
2066
2067 void
2068 unrequest_sigio ()
2069 {
2070   if (noninteractive)
2071     return;
2072   croak ("unrequest sigio");
2073 }
2074
2075 #endif /* VMS */
2076 \f
2077 /* Note that VMS compiler won't accept defined (CANNOT_DUMP).  */
2078 #ifndef CANNOT_DUMP
2079 #define NEED_STARTS
2080 #endif
2081
2082 #ifndef SYSTEM_MALLOC
2083 #ifndef NEED_STARTS
2084 #define NEED_STARTS
2085 #endif
2086 #endif
2087
2088 #ifdef NEED_STARTS
2089 /* Some systems that cannot dump also cannot implement these.  */
2090
2091 /*
2092  *      Return the address of the start of the text segment prior to
2093  *      doing an unexec.  After unexec the return value is undefined.
2094  *      See crt0.c for further explanation and _start.
2095  *
2096  */
2097
2098 #if !(defined (__NetBSD__) && defined (__ELF__))
2099 #ifndef HAVE_TEXT_START
2100 char *
2101 start_of_text ()
2102 {
2103 #ifdef TEXT_START
2104   return ((char *) TEXT_START);
2105 #else
2106   extern int _start ();
2107   return ((char *) _start);
2108 #endif /* TEXT_START */
2109 }
2110 #endif /* not HAVE_TEXT_START */
2111 #endif
2112
2113 /*
2114  *      Return the address of the start of the data segment prior to
2115  *      doing an unexec.  After unexec the return value is undefined.
2116  *      See crt0.c for further information and definition of data_start.
2117  *
2118  *      Apparently, on BSD systems this is etext at startup.  On
2119  *      USG systems (swapping) this is highly mmu dependent and
2120  *      is also dependent on whether or not the program is running
2121  *      with shared text.  Generally there is a (possibly large)
2122  *      gap between end of text and start of data with shared text.
2123  *
2124  *      On Uniplus+ systems with shared text, data starts at a
2125  *      fixed address.  Each port (from a given oem) is generally
2126  *      different, and the specific value of the start of data can
2127  *      be obtained via the UniPlus+ specific "uvar" system call,
2128  *      however the method outlined in crt0.c seems to be more portable.
2129  *
2130  *      Probably what will have to happen when a USG unexec is available,
2131  *      at least on UniPlus, is temacs will have to be made unshared so
2132  *      that text and data are contiguous.  Then once loadup is complete,
2133  *      unexec will produce a shared executable where the data can be
2134  *      at the normal shared text boundary and the startofdata variable
2135  *      will be patched by unexec to the correct value.
2136  *
2137  */
2138
2139 #ifndef start_of_data
2140 char *
2141 start_of_data ()
2142 {
2143 #ifdef DATA_START
2144   return ((char *) DATA_START);
2145 #else
2146 #ifdef ORDINARY_LINK
2147   /*
2148    * This is a hack.  Since we're not linking crt0.c or pre_crt0.c,
2149    * data_start isn't defined.  We take the address of environ, which
2150    * is known to live at or near the start of the system crt0.c, and
2151    * we don't sweat the handful of bytes that might lose.
2152    */
2153   extern char **environ;
2154
2155   return ((char *) &environ);
2156 #else
2157   extern int data_start;
2158   return ((char *) &data_start);
2159 #endif /* ORDINARY_LINK */
2160 #endif /* DATA_START */
2161 }
2162 #endif /* start_of_data */
2163 #endif /* NEED_STARTS (not CANNOT_DUMP or not SYSTEM_MALLOC) */
2164 \f
2165 /* init_system_name sets up the string for the Lisp function
2166    system-name to return. */
2167
2168 extern Lisp_Object Vsystem_name;
2169
2170 #ifndef VMS
2171 #ifdef HAVE_SOCKETS
2172 #include <sys/socket.h>
2173 #include <netdb.h>
2174 #endif /* HAVE_SOCKETS */
2175 #endif /* not VMS */
2176
2177 #ifdef TRY_AGAIN
2178 #ifndef HAVE_H_ERRNO
2179 extern int h_errno;
2180 #endif
2181 #endif /* TRY_AGAIN */
2182
2183 void
2184 init_system_name ()
2185 {
2186 #ifdef VMS
2187   char *sp, *end;
2188   if ((sp = egetenv ("SYS$NODE")) == 0)
2189     Vsystem_name = build_string ("vax-vms");
2190   else if ((end = index (sp, ':')) == 0)
2191     Vsystem_name = build_string (sp);
2192   else
2193     Vsystem_name = make_string (sp, end - sp);
2194 #else
2195 #ifndef HAVE_GETHOSTNAME
2196   struct utsname uts;
2197   uname (&uts);
2198   Vsystem_name = build_string (uts.nodename);
2199 #else /* HAVE_GETHOSTNAME */
2200   unsigned int hostname_size = 256;
2201   char *hostname = (char *) alloca (hostname_size);
2202
2203   /* Try to get the host name; if the buffer is too short, try
2204      again.  Apparently, the only indication gethostname gives of
2205      whether the buffer was large enough is the presence or absence
2206      of a '\0' in the string.  Eech.  */
2207   for (;;)
2208     {
2209       gethostname (hostname, hostname_size - 1);
2210       hostname[hostname_size - 1] = '\0';
2211
2212       /* Was the buffer large enough for the '\0'?  */
2213       if (strlen (hostname) < hostname_size - 1)
2214         break;
2215
2216       hostname_size <<= 1;
2217       hostname = (char *) alloca (hostname_size);
2218     }
2219 #ifdef HAVE_SOCKETS
2220   /* Turn the hostname into the official, fully-qualified hostname.
2221      Don't do this if we're going to dump; this can confuse system
2222      libraries on some machines and make the dumped emacs core dump. */
2223 #ifndef CANNOT_DUMP
2224   if (initialized)
2225 #endif /* not CANNOT_DUMP */
2226     if (! index (hostname, '.'))
2227       {
2228         int count;
2229 #ifdef HAVE_GETADDRINFO
2230         struct addrinfo *res;
2231         struct addrinfo hints;
2232         int ret;
2233
2234         memset (&hints, 0, sizeof(hints));
2235         hints.ai_socktype = SOCK_STREAM;
2236         hints.ai_flags = AI_CANONNAME;
2237
2238         for (count = 0;; count++)
2239           {
2240             if ((ret = getaddrinfo (hostname, NULL, &hints, &res)) == 0
2241                 || ret != EAI_AGAIN)
2242               break;
2243
2244             if (count >= 5)
2245               break;
2246             Fsleep_for (make_number (1), Qnil);
2247           }
2248
2249         if (ret == 0)
2250           {
2251             struct addrinfo *it = res;
2252             while (it)
2253               {
2254                 char *fqdn = it->ai_canonname;
2255                 if (fqdn && index (fqdn, '.')
2256                     && strcmp (fqdn, "localhost.localdomain") != 0)
2257                   break;
2258                 it = it->ai_next;
2259               }
2260             if (it)
2261               {
2262                 hostname = alloca (strlen (it->ai_canonname) + 1);
2263                 strcpy (hostname, it->ai_canonname);
2264               }
2265             freeaddrinfo (res);
2266           }
2267 #else /* !HAVE_GETADDRINFO */
2268         struct hostent *hp;
2269         for (count = 0;; count++)
2270           {
2271
2272 #ifdef TRY_AGAIN
2273             h_errno = 0;
2274 #endif
2275             hp = gethostbyname (hostname);
2276 #ifdef TRY_AGAIN
2277             if (! (hp == 0 && h_errno == TRY_AGAIN))
2278 #endif
2279
2280               break;
2281
2282             if (count >= 5)
2283               break;
2284             Fsleep_for (make_number (1), Qnil);
2285           }
2286
2287         if (hp)
2288           {
2289             char *fqdn = (char *) hp->h_name;
2290
2291             if (!index (fqdn, '.'))
2292               {
2293                 /* We still don't have a fully qualified domain name.
2294                    Try to find one in the list of alternate names */
2295                 char **alias = hp->h_aliases;
2296                 while (*alias
2297                        && (!index (*alias, '.')
2298                            || !strcmp (*alias, "localhost.localdomain")))
2299                   alias++;
2300                 if (*alias)
2301                   fqdn = *alias;
2302               }
2303             hostname = fqdn;
2304           }
2305 #endif /* !HAVE_GETADDRINFO */
2306       }
2307 #endif /* HAVE_SOCKETS */
2308   Vsystem_name = build_string (hostname);
2309 #endif /* HAVE_GETHOSTNAME */
2310 #endif /* VMS */
2311   {
2312     unsigned char *p;
2313     for (p = SDATA (Vsystem_name); *p; p++)
2314       if (*p == ' ' || *p == '\t')
2315         *p = '-';
2316   }
2317 }
2318 \f
2319 #ifndef MSDOS
2320 #ifndef VMS
2321 #if !defined (HAVE_SELECT)
2322
2323 #include "sysselect.h"
2324 #undef select
2325
2326 #if defined (HAVE_X_WINDOWS) && !defined (HAVE_SELECT)
2327 /* Cause explanatory error message at compile time,
2328    since the select emulation is not good enough for X.  */
2329 int *x = &x_windows_lose_if_no_select_system_call;
2330 #endif
2331
2332 /* Emulate as much as select as is possible under 4.1 and needed by Gnu Emacs
2333  * Only checks read descriptors.
2334  */
2335 /* How long to wait between checking fds in select */
2336 #define SELECT_PAUSE 1
2337 int select_alarmed;
2338
2339 /* For longjmp'ing back to read_input_waiting.  */
2340
2341 jmp_buf read_alarm_throw;
2342
2343 /* Nonzero if the alarm signal should throw back to read_input_waiting.
2344    The read_socket_hook function sets this to 1 while it is waiting.  */
2345
2346 int read_alarm_should_throw;
2347
2348 SIGTYPE
2349 select_alarm ()
2350 {
2351   select_alarmed = 1;
2352   signal (SIGALRM, SIG_IGN);
2353   SIGNAL_THREAD_CHECK (SIGALRM);
2354   if (read_alarm_should_throw)
2355     longjmp (read_alarm_throw, 1);
2356 }
2357
2358 #ifndef WINDOWSNT
2359 /* Only rfds are checked.  */
2360 int
2361 sys_select (nfds, rfds, wfds, efds, timeout)
2362      int nfds;
2363      SELECT_TYPE *rfds, *wfds, *efds;
2364      EMACS_TIME *timeout;
2365 {
2366   /* XXX This needs to be updated for multi-tty support.  Is there
2367      anybody who needs to emulate select these days?  */
2368  int ravail = 0;
2369   SELECT_TYPE orfds;
2370   int timeoutval;
2371   int *local_timeout;
2372   extern int proc_buffered_char[];
2373 #ifndef subprocesses
2374   int process_tick = 0, update_tick = 0;
2375 #else
2376   extern int process_tick, update_tick;
2377 #endif
2378   unsigned char buf;
2379
2380 #if defined (HAVE_SELECT) && defined (HAVE_X_WINDOWS)
2381   /* If we're using X, then the native select will work; we only need the
2382      emulation for non-X usage.  */
2383   if (!NILP (Vinitial_window_system))
2384     return select (nfds, rfds, wfds, efds, timeout);
2385 #endif
2386   timeoutval = timeout ? EMACS_SECS (*timeout) : 100000;
2387   local_timeout = &timeoutval;
2388   FD_ZERO (&orfds);
2389   if (rfds)
2390     {
2391       orfds = *rfds;
2392       FD_ZERO (rfds);
2393     }
2394   if (wfds)
2395     FD_ZERO (wfds);
2396   if (efds)
2397     FD_ZERO (efds);
2398
2399   /* If we are looking only for the terminal, with no timeout,
2400      just read it and wait -- that's more efficient.  */
2401   if (*local_timeout == 100000 && process_tick == update_tick
2402       && FD_ISSET (0, &orfds))
2403     {
2404       int fd;
2405       for (fd = 1; fd < nfds; ++fd)
2406         if (FD_ISSET (fd, &orfds))
2407           goto hardway;
2408       if (! detect_input_pending ())
2409         read_input_waiting ();
2410       FD_SET (0, rfds);
2411       return 1;
2412     }
2413
2414  hardway:
2415   /* Once a second, till the timer expires, check all the flagged read
2416    * descriptors to see if any input is available.  If there is some then
2417    * set the corresponding bit in the return copy of rfds.
2418    */
2419   while (1)
2420     {
2421       register int to_check, fd;
2422
2423       if (rfds)
2424         {
2425           for (to_check = nfds, fd = 0; --to_check >= 0; fd++)
2426             {
2427               if (FD_ISSET (fd, &orfds))
2428                 {
2429                   int avail = 0, status = 0;
2430
2431                   if (fd == 0)
2432                     avail = detect_input_pending (); /* Special keyboard handler */
2433                   else
2434                     {
2435 #ifdef FIONREAD
2436                       status = ioctl (fd, FIONREAD, &avail);
2437 #else /* no FIONREAD */
2438                       /* Hoping it will return -1 if nothing available
2439                          or 0 if all 0 chars requested are read.  */
2440                       if (proc_buffered_char[fd] >= 0)
2441                         avail = 1;
2442                       else
2443                         {
2444                           avail = read (fd, &buf, 1);
2445                           if (avail > 0)
2446                             proc_buffered_char[fd] = buf;
2447                         }
2448 #endif /* no FIONREAD */
2449                     }
2450                   if (status >= 0 && avail > 0)
2451                     {
2452                       FD_SET (fd, rfds);
2453                       ravail++;
2454                     }
2455                 }
2456             }
2457         }
2458       if (*local_timeout == 0 || ravail != 0 || process_tick != update_tick)
2459         break;
2460
2461       turn_on_atimers (0);
2462       signal (SIGALRM, select_alarm);
2463       select_alarmed = 0;
2464       alarm (SELECT_PAUSE);
2465
2466       /* Wait for a SIGALRM (or maybe a SIGTINT) */
2467       while (select_alarmed == 0 && *local_timeout != 0
2468              && process_tick == update_tick)
2469         {
2470           /* If we are interested in terminal input,
2471              wait by reading the terminal.
2472              That makes instant wakeup for terminal input at least.  */
2473           if (FD_ISSET (0, &orfds))
2474             {
2475               read_input_waiting ();
2476               if (detect_input_pending ())
2477                 select_alarmed = 1;
2478             }
2479           else
2480             pause ();
2481         }
2482       (*local_timeout) -= SELECT_PAUSE;
2483
2484       /* Reset the old alarm if there was one.  */
2485       turn_on_atimers (1);
2486
2487       if (*local_timeout == 0)  /* Stop on timer being cleared */
2488         break;
2489     }
2490   return ravail;
2491 }
2492 #endif /* not WINDOWSNT */
2493
2494 /* Read keyboard input into the standard buffer,
2495    waiting for at least one character.  */
2496
2497 void
2498 read_input_waiting ()
2499 {
2500   /* XXX This needs to be updated for multi-tty support.  Is there
2501      anybody who needs to emulate select these days?  */
2502   int nread, i;
2503   extern int quit_char;
2504
2505   if (read_socket_hook)
2506     {
2507       struct input_event hold_quit;
2508
2509       EVENT_INIT (hold_quit);
2510       hold_quit.kind = NO_EVENT;
2511
2512       read_alarm_should_throw = 0;
2513       if (! setjmp (read_alarm_throw))
2514         nread = (*read_socket_hook) (0, 1, &hold_quit);
2515       else
2516         nread = -1;
2517
2518       if (hold_quit.kind != NO_EVENT)
2519         kbd_buffer_store_event (&hold_quit);
2520     }
2521   else
2522     {
2523       struct input_event e;
2524       char buf[3];
2525       nread = read (fileno (stdin), buf, 1);
2526       EVENT_INIT (e);
2527
2528       /* Scan the chars for C-g and store them in kbd_buffer.  */
2529       e.kind = ASCII_KEYSTROKE_EVENT;
2530       e.frame_or_window = selected_frame;
2531       e.modifiers = 0;
2532       for (i = 0; i < nread; i++)
2533         {
2534           /* Convert chars > 0177 to meta events if desired.
2535              We do this under the same conditions that read_avail_input does.  */
2536           if (read_socket_hook == 0)
2537             {
2538               /* If the user says she has a meta key, then believe her. */
2539               if (meta_key == 1 && (buf[i] & 0x80))
2540                 e.modifiers = meta_modifier;
2541               if (meta_key != 2)
2542                 buf[i] &= ~0x80;
2543             }
2544
2545           XSETINT (e.code, buf[i]);
2546           kbd_buffer_store_event (&e);
2547           /* Don't look at input that follows a C-g too closely.
2548              This reduces lossage due to autorepeat on C-g.  */
2549           if (buf[i] == quit_char)
2550             break;
2551         }
2552     }
2553 }
2554
2555 #if !defined (HAVE_SELECT)
2556 #define select sys_select
2557 #endif
2558
2559 #endif /* not HAVE_SELECT */
2560 #endif /* not VMS */
2561 #endif /* not MSDOS */
2562 \f
2563 /* POSIX signals support - DJB */
2564 /* Anyone with POSIX signals should have ANSI C declarations */
2565
2566 #ifdef POSIX_SIGNALS
2567
2568 sigset_t empty_mask, full_mask;
2569
2570 signal_handler_t
2571 sys_signal (int signal_number, signal_handler_t action)
2572 {
2573   struct sigaction new_action, old_action;
2574   sigemptyset (&new_action.sa_mask);
2575   new_action.sa_handler = action;
2576 #if defined (SA_RESTART) && ! defined (BROKEN_SA_RESTART) && !defined(SYNC_INPUT)
2577   /* Emacs mostly works better with restartable system services. If this
2578      flag exists, we probably want to turn it on here.
2579      However, on some systems this resets the timeout of `select'
2580      which means that `select' never finishes if it keeps getting signals.
2581      BROKEN_SA_RESTART is defined on those systems.  */
2582   /* It's not clear why the comment above says "mostly works better".  --Stef
2583      When SYNC_INPUT is set, we don't want SA_RESTART because we need to poll
2584      for pending input so we need long-running syscalls to be interrupted
2585      after a signal that sets the interrupt_input_pending flag.  */
2586   new_action.sa_flags = SA_RESTART;
2587 #else
2588   new_action.sa_flags = 0;
2589 #endif
2590   sigaction (signal_number, &new_action, &old_action);
2591   return (old_action.sa_handler);
2592 }
2593
2594 #ifndef __GNUC__
2595 /* If we're compiling with GCC, we don't need this function, since it
2596    can be written as a macro.  */
2597 sigset_t
2598 sys_sigmask (int sig)
2599 {
2600   sigset_t mask;
2601   sigemptyset (&mask);
2602   sigaddset (&mask, sig);
2603   return mask;
2604 }
2605 #endif
2606
2607 /* I'd like to have these guys return pointers to the mask storage in here,
2608    but there'd be trouble if the code was saving multiple masks.  I'll be
2609    safe and pass the structure.  It normally won't be more than 2 bytes
2610    anyhow. - DJB */
2611
2612 sigset_t
2613 sys_sigblock (sigset_t new_mask)
2614 {
2615   sigset_t old_mask;
2616   sigprocmask (SIG_BLOCK, &new_mask, &old_mask);
2617   return (old_mask);
2618 }
2619
2620 sigset_t
2621 sys_sigunblock (sigset_t new_mask)
2622 {
2623   sigset_t old_mask;
2624   sigprocmask (SIG_UNBLOCK, &new_mask, &old_mask);
2625   return (old_mask);
2626 }
2627
2628 sigset_t
2629 sys_sigsetmask (sigset_t new_mask)
2630 {
2631   sigset_t old_mask;
2632   sigprocmask (SIG_SETMASK, &new_mask, &old_mask);
2633   return (old_mask);
2634 }
2635
2636 #endif /* POSIX_SIGNALS */
2637 \f
2638 #if !defined HAVE_STRSIGNAL && !HAVE_DECL_SYS_SIGLIST
2639 static char *my_sys_siglist[NSIG];
2640 # ifdef sys_siglist
2641 #  undef sys_siglist
2642 # endif
2643 # define sys_siglist my_sys_siglist
2644 #endif
2645
2646 void
2647 init_signals ()
2648 {
2649 #ifdef POSIX_SIGNALS
2650   sigemptyset (&empty_mask);
2651   sigfillset (&full_mask);
2652 #endif
2653
2654 #if !defined HAVE_STRSIGNAL && !HAVE_DECL_SYS_SIGLIST
2655   if (! initialized)
2656     {
2657 # ifdef SIGABRT
2658       sys_siglist[SIGABRT] = "Aborted";
2659 # endif
2660 # ifdef SIGAIO
2661       sys_siglist[SIGAIO] = "LAN I/O interrupt";
2662 # endif
2663 # ifdef SIGALRM
2664       sys_siglist[SIGALRM] = "Alarm clock";
2665 # endif
2666 # ifdef SIGBUS
2667       sys_siglist[SIGBUS] = "Bus error";
2668 # endif
2669 # ifdef SIGCLD
2670       sys_siglist[SIGCLD] = "Child status changed";
2671 # endif
2672 # ifdef SIGCHLD
2673       sys_siglist[SIGCHLD] = "Child status changed";
2674 # endif
2675 # ifdef SIGCONT
2676       sys_siglist[SIGCONT] = "Continued";
2677 # endif
2678 # ifdef SIGDANGER
2679       sys_siglist[SIGDANGER] = "Swap space dangerously low";
2680 # endif
2681 # ifdef SIGDGNOTIFY
2682       sys_siglist[SIGDGNOTIFY] = "Notification message in queue";
2683 # endif
2684 # ifdef SIGEMT
2685       sys_siglist[SIGEMT] = "Emulation trap";
2686 # endif
2687 # ifdef SIGFPE
2688       sys_siglist[SIGFPE] = "Arithmetic exception";
2689 # endif
2690 # ifdef SIGFREEZE
2691       sys_siglist[SIGFREEZE] = "SIGFREEZE";
2692 # endif
2693 # ifdef SIGGRANT
2694       sys_siglist[SIGGRANT] = "Monitor mode granted";
2695 # endif
2696 # ifdef SIGHUP
2697       sys_siglist[SIGHUP] = "Hangup";
2698 # endif
2699 # ifdef SIGILL
2700       sys_siglist[SIGILL] = "Illegal instruction";
2701 # endif
2702 # ifdef SIGINT
2703       sys_siglist[SIGINT] = "Interrupt";
2704 # endif
2705 # ifdef SIGIO
2706       sys_siglist[SIGIO] = "I/O possible";
2707 # endif
2708 # ifdef SIGIOINT
2709       sys_siglist[SIGIOINT] = "I/O intervention required";
2710 # endif
2711 # ifdef SIGIOT
2712       sys_siglist[SIGIOT] = "IOT trap";
2713 # endif
2714 # ifdef SIGKILL
2715       sys_siglist[SIGKILL] = "Killed";
2716 # endif
2717 # ifdef SIGLOST
2718       sys_siglist[SIGLOST] = "Resource lost";
2719 # endif
2720 # ifdef SIGLWP
2721       sys_siglist[SIGLWP] = "SIGLWP";
2722 # endif
2723 # ifdef SIGMSG
2724       sys_siglist[SIGMSG] = "Monitor mode data available";
2725 # endif
2726 # ifdef SIGPHONE
2727       sys_siglist[SIGWIND] = "SIGPHONE";
2728 # endif
2729 # ifdef SIGPIPE
2730       sys_siglist[SIGPIPE] = "Broken pipe";
2731 # endif
2732 # ifdef SIGPOLL
2733       sys_siglist[SIGPOLL] = "Pollable event occurred";
2734 # endif
2735 # ifdef SIGPROF
2736       sys_siglist[SIGPROF] = "Profiling timer expired";
2737 # endif
2738 # ifdef SIGPTY
2739       sys_siglist[SIGPTY] = "PTY I/O interrupt";
2740 # endif
2741 # ifdef SIGPWR
2742       sys_siglist[SIGPWR] = "Power-fail restart";
2743 # endif
2744 # ifdef SIGQUIT
2745       sys_siglist[SIGQUIT] = "Quit";
2746 # endif
2747 # ifdef SIGRETRACT
2748       sys_siglist[SIGRETRACT] = "Need to relinguish monitor mode";
2749 # endif
2750 # ifdef SIGSAK
2751       sys_siglist[SIGSAK] = "Secure attention";
2752 # endif
2753 # ifdef SIGSEGV
2754       sys_siglist[SIGSEGV] = "Segmentation violation";
2755 # endif
2756 # ifdef SIGSOUND
2757       sys_siglist[SIGSOUND] = "Sound completed";
2758 # endif
2759 # ifdef SIGSTOP
2760       sys_siglist[SIGSTOP] = "Stopped (signal)";
2761 # endif
2762 # ifdef SIGSTP
2763       sys_siglist[SIGSTP] = "Stopped (user)";
2764 # endif
2765 # ifdef SIGSYS
2766       sys_siglist[SIGSYS] = "Bad argument to system call";
2767 # endif
2768 # ifdef SIGTERM
2769       sys_siglist[SIGTERM] = "Terminated";
2770 # endif
2771 # ifdef SIGTHAW
2772       sys_siglist[SIGTHAW] = "SIGTHAW";
2773 # endif
2774 # ifdef SIGTRAP
2775       sys_siglist[SIGTRAP] = "Trace/breakpoint trap";
2776 # endif
2777 # ifdef SIGTSTP
2778       sys_siglist[SIGTSTP] = "Stopped (user)";
2779 # endif
2780 # ifdef SIGTTIN
2781       sys_siglist[SIGTTIN] = "Stopped (tty input)";
2782 # endif
2783 # ifdef SIGTTOU
2784       sys_siglist[SIGTTOU] = "Stopped (tty output)";
2785 # endif
2786 # ifdef SIGURG
2787       sys_siglist[SIGURG] = "Urgent I/O condition";
2788 # endif
2789 # ifdef SIGUSR1
2790       sys_siglist[SIGUSR1] = "User defined signal 1";
2791 # endif
2792 # ifdef SIGUSR2
2793       sys_siglist[SIGUSR2] = "User defined signal 2";
2794 # endif
2795 # ifdef SIGVTALRM
2796       sys_siglist[SIGVTALRM] = "Virtual timer expired";
2797 # endif
2798 # ifdef SIGWAITING
2799       sys_siglist[SIGWAITING] = "Process's LWPs are blocked";
2800 # endif
2801 # ifdef SIGWINCH
2802       sys_siglist[SIGWINCH] = "Window size changed";
2803 # endif
2804 # ifdef SIGWIND
2805       sys_siglist[SIGWIND] = "SIGWIND";
2806 # endif
2807 # ifdef SIGXCPU
2808       sys_siglist[SIGXCPU] = "CPU time limit exceeded";
2809 # endif
2810 # ifdef SIGXFSZ
2811       sys_siglist[SIGXFSZ] = "File size limit exceeded";
2812 # endif
2813     }
2814 #endif /* !defined HAVE_STRSIGNAL && !defined HAVE_DECL_SYS_SIGLIST */
2815 }
2816 \f
2817 #ifndef HAVE_RANDOM
2818 #ifdef random
2819 #define HAVE_RANDOM
2820 #endif
2821 #endif
2822
2823 /* Figure out how many bits the system's random number generator uses.
2824    `random' and `lrand48' are assumed to return 31 usable bits.
2825    BSD `rand' returns a 31 bit value but the low order bits are unusable;
2826    so we'll shift it and treat it like the 15-bit USG `rand'.  */
2827
2828 #ifndef RAND_BITS
2829 # ifdef HAVE_RANDOM
2830 #  define RAND_BITS 31
2831 # else /* !HAVE_RANDOM */
2832 #  ifdef HAVE_LRAND48
2833 #   define RAND_BITS 31
2834 #   define random lrand48
2835 #  else /* !HAVE_LRAND48 */
2836 #   define RAND_BITS 15
2837 #   if RAND_MAX == 32767
2838 #    define random rand
2839 #   else /* RAND_MAX != 32767 */
2840 #    if RAND_MAX == 2147483647
2841 #     define random() (rand () >> 16)
2842 #    else /* RAND_MAX != 2147483647 */
2843 #     ifdef USG
2844 #      define random rand
2845 #     else
2846 #      define random() (rand () >> 16)
2847 #     endif /* !USG */
2848 #    endif /* RAND_MAX != 2147483647 */
2849 #   endif /* RAND_MAX != 32767 */
2850 #  endif /* !HAVE_LRAND48 */
2851 # endif /* !HAVE_RANDOM */
2852 #endif /* !RAND_BITS */
2853
2854 void
2855 seed_random (arg)
2856      long arg;
2857 {
2858 #ifdef HAVE_RANDOM
2859   srandom ((unsigned int)arg);
2860 #else
2861 # ifdef HAVE_LRAND48
2862   srand48 (arg);
2863 # else
2864   srand ((unsigned int)arg);
2865 # endif
2866 #endif
2867 }
2868
2869 /*
2870  * Build a full Emacs-sized word out of whatever we've got.
2871  * This suffices even for a 64-bit architecture with a 15-bit rand.
2872  */
2873 long
2874 get_random ()
2875 {
2876   long val = random ();
2877 #if VALBITS > RAND_BITS
2878   val = (val << RAND_BITS) ^ random ();
2879 #if VALBITS > 2*RAND_BITS
2880   val = (val << RAND_BITS) ^ random ();
2881 #if VALBITS > 3*RAND_BITS
2882   val = (val << RAND_BITS) ^ random ();
2883 #if VALBITS > 4*RAND_BITS
2884   val = (val << RAND_BITS) ^ random ();
2885 #endif /* need at least 5 */
2886 #endif /* need at least 4 */
2887 #endif /* need at least 3 */
2888 #endif /* need at least 2 */
2889   return val & ((1L << VALBITS) - 1);
2890 }
2891 \f
2892 #ifdef VMS
2893
2894 #ifdef getenv
2895 /* If any place else asks for the TERM variable,
2896    allow it to be overridden with the EMACS_TERM variable
2897    before attempting to translate the logical name TERM.  As a last
2898    resort, ask for VAX C's special idea of the TERM variable.  */
2899 #undef getenv
2900 char *
2901 sys_getenv (name)
2902      char *name;
2903 {
2904   register char *val;
2905   static char buf[256];
2906   static struct dsc$descriptor_s equiv
2907     = {sizeof (buf), DSC$K_DTYPE_T, DSC$K_CLASS_S, buf};
2908   static struct dsc$descriptor_s d_name
2909     = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0};
2910   short eqlen;
2911
2912   if (!strcmp (name, "TERM"))
2913     {
2914       val = (char *) getenv ("EMACS_TERM");
2915       if (val)
2916         return val;
2917     }
2918
2919   d_name.dsc$w_length = strlen (name);
2920   d_name.dsc$a_pointer = name;
2921   if (LIB$SYS_TRNLOG (&d_name, &eqlen, &equiv) == 1)
2922     {
2923       char *str = (char *) xmalloc (eqlen + 1);
2924       bcopy (buf, str, eqlen);
2925       str[eqlen] = '\0';
2926       /* This is a storage leak, but a pain to fix.  With luck,
2927          no one will ever notice.  */
2928       return str;
2929     }
2930   return (char *) getenv (name);
2931 }
2932 #endif /* getenv */
2933
2934 #ifdef abort
2935 /* Since VMS doesn't believe in core dumps, the only way to debug this beast is
2936    to force a call on the debugger from within the image. */
2937 #undef abort
2938 sys_abort ()
2939 {
2940   reset_all_sys_modes ();
2941   LIB$SIGNAL (SS$_DEBUG);
2942 }
2943 #endif /* abort */
2944 #endif /* VMS */
2945 \f
2946 #ifdef VMS
2947 #ifdef LINK_CRTL_SHARE
2948 #ifdef SHARABLE_LIB_BUG
2949 /* Variables declared noshare and initialized in sharable libraries
2950    cannot be shared.  The VMS linker incorrectly forces you to use a private
2951    version which is uninitialized... If not for this "feature", we
2952    could use the C library definition of sys_nerr and sys_errlist. */
2953 int sys_nerr = 35;
2954 char *sys_errlist[] =
2955   {
2956     "error 0",
2957     "not owner",
2958     "no such file or directory",
2959     "no such process",
2960     "interrupted system call",
2961     "i/o error",
2962     "no such device or address",
2963     "argument list too long",
2964     "exec format error",
2965     "bad file number",
2966     "no child process",
2967     "no more processes",
2968     "not enough memory",
2969     "permission denied",
2970     "bad address",
2971     "block device required",
2972     "mount devices busy",
2973     "file exists",
2974     "cross-device link",
2975     "no such device",
2976     "not a directory",
2977     "is a directory",
2978     "invalid argument",
2979     "file table overflow",
2980     "too many open files",
2981     "not a typewriter",
2982     "text file busy",
2983     "file too big",
2984     "no space left on device",
2985     "illegal seek",
2986     "read-only file system",
2987     "too many links",
2988     "broken pipe",
2989     "math argument",
2990     "result too large",
2991     "I/O stream empty",
2992     "vax/vms specific error code nontranslatable error"
2993   };
2994 #endif /* SHARABLE_LIB_BUG */
2995 #endif /* LINK_CRTL_SHARE */
2996 #endif /* VMS */
2997
2998 #ifndef HAVE_STRERROR
2999 #ifndef WINDOWSNT
3000 char *
3001 strerror (errnum)
3002      int errnum;
3003 {
3004   extern char *sys_errlist[];
3005   extern int sys_nerr;
3006
3007   if (errnum >= 0 && errnum < sys_nerr)
3008     return sys_errlist[errnum];
3009   return (char *) "Unknown error";
3010 }
3011 #endif /* not WINDOWSNT */
3012 #endif /* ! HAVE_STRERROR */
3013 \f
3014 int
3015 emacs_open (path, oflag, mode)
3016      const char *path;
3017      int oflag, mode;
3018 {
3019   register int rtnval;
3020
3021   while ((rtnval = open (path, oflag, mode)) == -1
3022          && (errno == EINTR))
3023     QUIT;
3024   return (rtnval);
3025 }
3026
3027 int
3028 emacs_close (fd)
3029      int fd;
3030 {
3031   int did_retry = 0;
3032   register int rtnval;
3033
3034 #if defined (MAC_OSX) && defined (HAVE_CARBON)
3035   {
3036     extern int mac_try_close_socket P_ ((int));
3037
3038     if (mac_try_close_socket (fd))
3039       return 0;
3040   }
3041 #endif
3042
3043   while ((rtnval = close (fd)) == -1
3044          && (errno == EINTR))
3045     did_retry = 1;
3046
3047   /* If close is interrupted SunOS 4.1 may or may not have closed the
3048      file descriptor.  If it did the second close will fail with
3049      errno = EBADF.  That means we have succeeded.  */
3050   if (rtnval == -1 && did_retry && errno == EBADF)
3051     return 0;
3052
3053   return rtnval;
3054 }
3055
3056 int
3057 emacs_read (fildes, buf, nbyte)
3058      int fildes;
3059      char *buf;
3060      unsigned int nbyte;
3061 {
3062   register int rtnval;
3063
3064   while ((rtnval = read (fildes, buf, nbyte)) == -1
3065          && (errno == EINTR))
3066     QUIT;
3067   return (rtnval);
3068 }
3069
3070 int
3071 emacs_write (fildes, buf, nbyte)
3072      int fildes;
3073      const char *buf;
3074      unsigned int nbyte;
3075 {
3076   register int rtnval, bytes_written;
3077
3078   bytes_written = 0;
3079
3080   while (nbyte > 0)
3081     {
3082       rtnval = write (fildes, buf, nbyte);
3083
3084       if (rtnval == -1)
3085         {
3086           if (errno == EINTR)
3087             {
3088 #ifdef SYNC_INPUT
3089               /* I originally used `QUIT' but that might causes files to
3090                  be truncated if you hit C-g in the middle of it.  --Stef  */
3091               if (interrupt_input_pending)
3092                 handle_async_input ();
3093               if (pending_atimers)
3094                 do_pending_atimers ();
3095 #endif
3096               continue;
3097             }
3098           else
3099             return (bytes_written ? bytes_written : -1);
3100         }
3101
3102       buf += rtnval;
3103       nbyte -= rtnval;
3104       bytes_written += rtnval;
3105     }
3106   return (bytes_written);
3107 }
3108 \f
3109 #ifdef USG
3110 /*
3111  *      All of the following are for USG.
3112  *
3113  *      On USG systems the system calls are INTERRUPTIBLE by signals
3114  *      that the user program has elected to catch.  Thus the system call
3115  *      must be retried in these cases.  To handle this without massive
3116  *      changes in the source code, we remap the standard system call names
3117  *      to names for our own functions in sysdep.c that do the system call
3118  *      with retries.  Actually, for portability reasons, it is good
3119  *      programming practice, as this example shows, to limit all actual
3120  *      system calls to a single occurrence in the source.  Sure, this
3121  *      adds an extra level of function call overhead but it is almost
3122  *      always negligible.   Fred Fish, Unisoft Systems Inc.
3123  */
3124
3125 /*
3126  *      Warning, this function may not duplicate 4.2 action properly
3127  *      under error conditions.
3128  */
3129
3130 #ifndef MAXPATHLEN
3131 /* In 4.1, param.h fails to define this.  */
3132 #define MAXPATHLEN 1024
3133 #endif
3134
3135 #ifndef HAVE_GETWD
3136
3137 char *
3138 getwd (pathname)
3139      char *pathname;
3140 {
3141   char *npath, *spath;
3142   extern char *getcwd ();
3143
3144   BLOCK_INPUT;                  /* getcwd uses malloc */
3145   spath = npath = getcwd ((char *) 0, MAXPATHLEN);
3146   if (spath == 0)
3147     {
3148       UNBLOCK_INPUT;
3149       return spath;
3150     }
3151   /* On Altos 3068, getcwd can return @hostname/dir, so discard
3152      up to first slash.  Should be harmless on other systems.  */
3153   while (*npath && *npath != '/')
3154     npath++;
3155   strcpy (pathname, npath);
3156   free (spath);                 /* getcwd uses malloc */
3157   UNBLOCK_INPUT;
3158   return pathname;
3159 }
3160
3161 #endif /* HAVE_GETWD */
3162
3163 /*
3164  *      Emulate rename using unlink/link.  Note that this is
3165  *      only partially correct.  Also, doesn't enforce restriction
3166  *      that files be of same type (regular->regular, dir->dir, etc).
3167  */
3168
3169 #ifndef HAVE_RENAME
3170
3171 rename (from, to)
3172      const char *from;
3173      const char *to;
3174 {
3175   if (access (from, 0) == 0)
3176     {
3177       unlink (to);
3178       if (link (from, to) == 0)
3179         if (unlink (from) == 0)
3180           return (0);
3181     }
3182   return (-1);
3183 }
3184
3185 #endif
3186
3187
3188 #ifdef HPUX
3189 #ifndef HAVE_PERROR
3190
3191 /* HPUX curses library references perror, but as far as we know
3192    it won't be called.  Anyway this definition will do for now.  */
3193
3194 perror ()
3195 {
3196 }
3197
3198 #endif /* not HAVE_PERROR */
3199 #endif /* HPUX */
3200
3201 #ifndef HAVE_DUP2
3202
3203 /*
3204  *      Emulate BSD dup2.  First close newd if it already exists.
3205  *      Then, attempt to dup oldd.  If not successful, call dup2 recursively
3206  *      until we are, then close the unsuccessful ones.
3207  */
3208
3209 dup2 (oldd, newd)
3210      int oldd;
3211      int newd;
3212 {
3213   register int fd, ret;
3214
3215   emacs_close (newd);
3216
3217 #ifdef F_DUPFD
3218   return fcntl (oldd, F_DUPFD, newd);
3219 #else
3220   fd = dup (old);
3221   if (fd == -1)
3222     return -1;
3223   if (fd == new)
3224     return new;
3225   ret = dup2 (old,new);
3226   emacs_close (fd);
3227   return ret;
3228 #endif
3229 }
3230
3231 #endif /* not HAVE_DUP2 */
3232
3233 /*
3234  *      Gettimeofday.  Simulate as much as possible.  Only accurate
3235  *      to nearest second.  Emacs doesn't use tzp so ignore it for now.
3236  *      Only needed when subprocesses are defined.
3237  */
3238
3239 #ifdef subprocesses
3240 #ifndef VMS
3241 #ifndef HAVE_GETTIMEOFDAY
3242 #ifdef HAVE_TIMEVAL
3243
3244 /* ARGSUSED */
3245 int
3246 gettimeofday (tp, tzp)
3247      struct timeval *tp;
3248      struct timezone *tzp;
3249 {
3250   extern long time ();
3251
3252   tp->tv_sec = time ((long *)0);
3253   tp->tv_usec = 0;
3254   if (tzp != 0)
3255     tzp->tz_minuteswest = -1;
3256   return 0;
3257 }
3258
3259 #endif
3260 #endif
3261 #endif
3262 #endif /* subprocess && !HAVE_GETTIMEOFDAY && HAVE_TIMEVAL && !VMS */
3263
3264 /*
3265  *      This function will go away as soon as all the stubs fixed. (fnf)
3266  */
3267
3268 void
3269 croak (badfunc)
3270      char *badfunc;
3271 {
3272   printf ("%s not yet implemented\r\n", badfunc);
3273   reset_all_sys_modes ();
3274   exit (1);
3275 }
3276
3277 #endif /* USG */
3278 \f
3279 /* Directory routines for systems that don't have them. */
3280
3281 #ifdef SYSV_SYSTEM_DIR
3282
3283 #include <dirent.h>
3284
3285 #if defined (BROKEN_CLOSEDIR) || !defined (HAVE_CLOSEDIR)
3286
3287 int
3288 closedir (dirp)
3289      register DIR *dirp;              /* stream from opendir */
3290 {
3291   int rtnval;
3292
3293   rtnval = emacs_close (dirp->dd_fd);
3294
3295   /* Some systems (like Solaris) allocate the buffer and the DIR all
3296      in one block.  Why in the world are we freeing this ourselves
3297      anyway?  */
3298 #if ! defined (SOLARIS2)
3299   xfree ((char *) dirp->dd_buf); /* directory block defined in <dirent.h> */
3300 #endif
3301   xfree ((char *) dirp);
3302
3303   return rtnval;
3304 }
3305 #endif /* BROKEN_CLOSEDIR or not HAVE_CLOSEDIR */
3306 #endif /* SYSV_SYSTEM_DIR */
3307
3308 #ifdef NONSYSTEM_DIR_LIBRARY
3309
3310 DIR *
3311 opendir (filename)
3312      char *filename;    /* name of directory */
3313 {
3314   register DIR *dirp;           /* -> malloc'ed storage */
3315   register int fd;              /* file descriptor for read */
3316   struct stat sbuf;             /* result of fstat */
3317
3318   fd = emacs_open (filename, O_RDONLY, 0);
3319   if (fd < 0)
3320     return 0;
3321
3322   BLOCK_INPUT;
3323   if (fstat (fd, &sbuf) < 0
3324       || (sbuf.st_mode & S_IFMT) != S_IFDIR
3325       || (dirp = (DIR *) xmalloc (sizeof (DIR))) == 0)
3326     {
3327       emacs_close (fd);
3328       UNBLOCK_INPUT;
3329       return 0;         /* bad luck today */
3330     }
3331   UNBLOCK_INPUT;
3332
3333   dirp->dd_fd = fd;
3334   dirp->dd_loc = dirp->dd_size = 0;     /* refill needed */
3335
3336   return dirp;
3337 }
3338
3339 void
3340 closedir (dirp)
3341      register DIR *dirp;                /* stream from opendir */
3342 {
3343   emacs_close (dirp->dd_fd);
3344   xfree ((char *) dirp);
3345 }
3346
3347
3348 #ifndef VMS
3349 #define DIRSIZ  14
3350 struct olddir
3351   {
3352     ino_t od_ino;               /* inode */
3353     char od_name[DIRSIZ];       /* filename */
3354   };
3355 #endif /* not VMS */
3356
3357 struct direct dir_static;       /* simulated directory contents */
3358
3359 /* ARGUSED */
3360 struct direct *
3361 readdir (dirp)
3362      register DIR *dirp;        /* stream from opendir */
3363 {
3364 #ifndef VMS
3365   register struct olddir *dp;   /* -> directory data */
3366 #else /* VMS */
3367   register struct dir$_name *dp; /* -> directory data */
3368   register struct dir$_version *dv; /* -> version data */
3369 #endif /* VMS */
3370
3371   for (; ;)
3372     {
3373       if (dirp->dd_loc >= dirp->dd_size)
3374         dirp->dd_loc = dirp->dd_size = 0;
3375
3376       if (dirp->dd_size == 0    /* refill buffer */
3377           && (dirp->dd_size = emacs_read (dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
3378         return 0;
3379
3380 #ifndef VMS
3381       dp = (struct olddir *) &dirp->dd_buf[dirp->dd_loc];
3382       dirp->dd_loc += sizeof (struct olddir);
3383
3384       if (dp->od_ino != 0)      /* not deleted entry */
3385         {
3386           dir_static.d_ino = dp->od_ino;
3387           strncpy (dir_static.d_name, dp->od_name, DIRSIZ);
3388           dir_static.d_name[DIRSIZ] = '\0';
3389           dir_static.d_namlen = strlen (dir_static.d_name);
3390           dir_static.d_reclen = sizeof (struct direct)
3391             - MAXNAMLEN + 3
3392               + dir_static.d_namlen - dir_static.d_namlen % 4;
3393           return &dir_static;   /* -> simulated structure */
3394         }
3395 #else /* VMS */
3396       dp = (struct dir$_name *) dirp->dd_buf;
3397       if (dirp->dd_loc == 0)
3398         dirp->dd_loc = (dp->dir$b_namecount&1) ? dp->dir$b_namecount + 1
3399           : dp->dir$b_namecount;
3400       dv = (struct dir$_version *)&dp->dir$t_name[dirp->dd_loc];
3401       dir_static.d_ino = dv->dir$w_fid_num;
3402       dir_static.d_namlen = dp->dir$b_namecount;
3403       dir_static.d_reclen = sizeof (struct direct)
3404         - MAXNAMLEN + 3
3405           + dir_static.d_namlen - dir_static.d_namlen % 4;
3406       strncpy (dir_static.d_name, dp->dir$t_name, dp->dir$b_namecount);
3407       dir_static.d_name[dir_static.d_namlen] = '\0';
3408       dirp->dd_loc = dirp->dd_size; /* only one record at a time */
3409       return &dir_static;
3410 #endif /* VMS */
3411     }
3412 }
3413
3414 #ifdef VMS
3415 /* readdirver is just like readdir except it returns all versions of a file
3416    as separate entries.  */
3417
3418 /* ARGUSED */
3419 struct direct *
3420 readdirver (dirp)
3421      register DIR *dirp;        /* stream from opendir */
3422 {
3423   register struct dir$_name *dp; /* -> directory data */
3424   register struct dir$_version *dv; /* -> version data */
3425
3426   if (dirp->dd_loc >= dirp->dd_size - sizeof (struct dir$_name))
3427     dirp->dd_loc = dirp->dd_size = 0;
3428
3429   if (dirp->dd_size == 0        /* refill buffer */
3430       && (dirp->dd_size = sys_read (dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
3431     return 0;
3432
3433   dp = (struct dir$_name *) dirp->dd_buf;
3434   if (dirp->dd_loc == 0)
3435     dirp->dd_loc = (dp->dir$b_namecount & 1) ? dp->dir$b_namecount + 1
3436                    : dp->dir$b_namecount;
3437   dv = (struct dir$_version *) &dp->dir$t_name[dirp->dd_loc];
3438   strncpy (dir_static.d_name, dp->dir$t_name, dp->dir$b_namecount);
3439   sprintf (&dir_static.d_name[dp->dir$b_namecount], ";%d", dv->dir$w_version);
3440   dir_static.d_namlen = strlen (dir_static.d_name);
3441   dir_static.d_ino = dv->dir$w_fid_num;
3442   dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3
3443                         + dir_static.d_namlen - dir_static.d_namlen % 4;
3444   dirp->dd_loc = ((char *) (++dv) - dp->dir$t_name);
3445   return &dir_static;
3446 }
3447
3448 #endif /* VMS */
3449
3450 #endif /* NONSYSTEM_DIR_LIBRARY */
3451
3452 \f
3453 int
3454 set_file_times (filename, atime, mtime)
3455      const char *filename;
3456      EMACS_TIME atime, mtime;
3457 {
3458 #ifdef HAVE_UTIMES
3459   struct timeval tv[2];
3460   tv[0] = atime;
3461   tv[1] = mtime;
3462   return utimes (filename, tv);
3463 #else /* not HAVE_UTIMES */
3464   struct utimbuf utb;
3465   utb.actime = EMACS_SECS (atime);
3466   utb.modtime = EMACS_SECS (mtime);
3467   return utime (filename, &utb);
3468 #endif /* not HAVE_UTIMES */
3469 }
3470 \f
3471 /* mkdir and rmdir functions, for systems which don't have them.  */
3472
3473 #ifndef HAVE_MKDIR
3474 /*
3475  * Written by Robert Rother, Mariah Corporation, August 1985.
3476  *
3477  * If you want it, it's yours.  All I ask in return is that if you
3478  * figure out how to do this in a Bourne Shell script you send me
3479  * a copy.
3480  *                                      sdcsvax!rmr or rmr@uscd
3481  *
3482  * Severely hacked over by John Gilmore to make a 4.2BSD compatible
3483  * subroutine.  11Mar86; hoptoad!gnu
3484  *
3485  * Modified by rmtodd@uokmax 6-28-87 -- when making an already existing dir,
3486  * subroutine didn't return EEXIST.  It does now.
3487  */
3488
3489 /*
3490  * Make a directory.
3491  */
3492 #ifdef MKDIR_PROTOTYPE
3493 MKDIR_PROTOTYPE
3494 #else
3495 int
3496 mkdir (dpath, dmode)
3497      char *dpath;
3498      int dmode;
3499 #endif
3500 {
3501   int cpid, status, fd;
3502   struct stat statbuf;
3503
3504   if (stat (dpath, &statbuf) == 0)
3505     {
3506       errno = EEXIST;           /* Stat worked, so it already exists */
3507       return -1;
3508     }
3509
3510   /* If stat fails for a reason other than non-existence, return error */
3511   if (errno != ENOENT)
3512     return -1;
3513
3514   synch_process_alive = 1;
3515   switch (cpid = fork ())
3516     {
3517
3518     case -1:                    /* Error in fork */
3519       return (-1);              /* Errno is set already */
3520
3521     case 0:                     /* Child process */
3522       /*
3523                  * Cheap hack to set mode of new directory.  Since this
3524                  * child process is going away anyway, we zap its umask.
3525                  * FIXME, this won't suffice to set SUID, SGID, etc. on this
3526                  * directory.  Does anybody care?
3527                  */
3528       status = umask (0);       /* Get current umask */
3529       status = umask (status | (0777 & ~dmode));        /* Set for mkdir */
3530       fd = emacs_open ("/dev/null", O_RDWR, 0);
3531       if (fd >= 0)
3532         {
3533           dup2 (fd, 0);
3534           dup2 (fd, 1);
3535           dup2 (fd, 2);
3536         }
3537       execl ("/bin/mkdir", "mkdir", dpath, (char *) 0);
3538       _exit (-1);               /* Can't exec /bin/mkdir */
3539
3540     default:                    /* Parent process */
3541       wait_for_termination (cpid);
3542     }
3543
3544   if (synch_process_death != 0 || synch_process_retcode != 0
3545       || synch_process_termsig != 0)
3546     {
3547       errno = EIO;              /* We don't know why, but */
3548       return -1;                /* /bin/mkdir failed */
3549     }
3550
3551   return 0;
3552 }
3553 #endif /* not HAVE_MKDIR */
3554
3555 #ifndef HAVE_RMDIR
3556 int
3557 rmdir (dpath)
3558      char *dpath;
3559 {
3560   int cpid, status, fd;
3561   struct stat statbuf;
3562
3563   if (stat (dpath, &statbuf) != 0)
3564     {
3565       /* Stat just set errno.  We don't have to */
3566       return -1;
3567     }
3568
3569   synch_process_alive = 1;
3570   switch (cpid = fork ())
3571     {
3572
3573     case -1:                    /* Error in fork */
3574       return (-1);              /* Errno is set already */
3575
3576     case 0:                     /* Child process */
3577       fd = emacs_open ("/dev/null", O_RDWR, 0);
3578       if (fd >= 0)
3579         {
3580           dup2 (fd, 0);
3581           dup2 (fd, 1);
3582           dup2 (fd, 2);
3583         }
3584       execl ("/bin/rmdir", "rmdir", dpath, (char *) 0);
3585       _exit (-1);               /* Can't exec /bin/rmdir */
3586
3587     default:                    /* Parent process */
3588       wait_for_termination (cpid);
3589     }
3590
3591   if (synch_process_death != 0 || synch_process_retcode != 0
3592       || synch_process_termsig != 0)
3593     {
3594       errno = EIO;              /* We don't know why, but */
3595       return -1;                /* /bin/rmdir failed */
3596     }
3597
3598   return 0;
3599 }
3600 #endif /* !HAVE_RMDIR */
3601
3602
3603 \f
3604 /* Functions for VMS */
3605 #ifdef VMS
3606 #include <acldef.h>
3607 #include <chpdef.h>
3608 #include <jpidef.h>
3609
3610 /* Return as a string the VMS error string pertaining to STATUS.
3611    Reuses the same static buffer each time it is called.  */
3612
3613 char *
3614 vmserrstr (status)
3615      int status;                /* VMS status code */
3616 {
3617   int bufadr[2];
3618   short len;
3619   static char buf[257];
3620
3621   bufadr[0] = sizeof buf - 1;
3622   bufadr[1] = (int) buf;
3623   if (! (SYS$GETMSG (status, &len, bufadr, 0x1, 0) & 1))
3624     return "untranslatable VMS error status";
3625   buf[len] = '\0';
3626   return buf;
3627 }
3628
3629 #ifdef access
3630 #undef access
3631
3632 /* The following is necessary because 'access' emulation by VMS C (2.0) does
3633  * not work correctly.  (It also doesn't work well in version 2.3.)
3634  */
3635
3636 #ifdef VMS4_4
3637
3638 #define DESCRIPTOR(name,string) struct dsc$descriptor_s name = \
3639         { strlen (string), DSC$K_DTYPE_T, DSC$K_CLASS_S, string }
3640
3641 typedef union {
3642     struct {
3643         unsigned short s_buflen;
3644         unsigned short s_code;
3645         char *s_bufadr;
3646         unsigned short *s_retlenadr;
3647     } s;
3648     int end;
3649 } item;
3650 #define buflen s.s_buflen
3651 #define code s.s_code
3652 #define bufadr s.s_bufadr
3653 #define retlenadr s.s_retlenadr
3654
3655 #define R_OK 4  /* test for read permission */
3656 #define W_OK 2  /* test for write permission */
3657 #define X_OK 1  /* test for execute (search) permission */
3658 #define F_OK 0  /* test for presence of file */
3659
3660 int
3661 sys_access (path, mode)
3662      char *path;
3663      int mode;
3664 {
3665   static char *user = NULL;
3666   char dir_fn[512];
3667
3668   /* translate possible directory spec into .DIR file name, so brain-dead
3669    * access can treat the directory like a file.  */
3670   if (directory_file_name (path, dir_fn))
3671     path = dir_fn;
3672
3673   if (mode == F_OK)
3674     return access (path, mode);
3675   if (user == NULL && (user = (char *) getenv ("USER")) == NULL)
3676     return -1;
3677   {
3678     int stat;
3679     int flags;
3680     int acces;
3681     unsigned short int dummy;
3682     item itemlst[3];
3683     static int constant = ACL$C_FILE;
3684     DESCRIPTOR (path_desc, path);
3685     DESCRIPTOR (user_desc, user);
3686
3687     flags = 0;
3688     acces = 0;
3689     if ((mode & X_OK) && ((stat = access (path, mode)) < 0 || mode == X_OK))
3690       return stat;
3691     if (mode & R_OK)
3692       acces |= CHP$M_READ;
3693     if (mode & W_OK)
3694       acces |= CHP$M_WRITE;
3695     itemlst[0].buflen = sizeof (int);
3696     itemlst[0].code = CHP$_FLAGS;
3697     itemlst[0].bufadr = (char *) &flags;
3698     itemlst[0].retlenadr = &dummy;
3699     itemlst[1].buflen = sizeof (int);
3700     itemlst[1].code = CHP$_ACCESS;
3701     itemlst[1].bufadr = (char *) &acces;
3702     itemlst[1].retlenadr = &dummy;
3703     itemlst[2].end = CHP$_END;
3704     stat = SYS$CHECK_ACCESS (&constant, &path_desc, &user_desc, itemlst);
3705     return stat == SS$_NORMAL ? 0 : -1;
3706   }
3707 }
3708
3709 #else /* not VMS4_4 */
3710
3711 #include <prvdef.h>
3712 #define ACE$M_WRITE     2
3713 #define ACE$C_KEYID     1
3714
3715 static unsigned short memid, grpid;
3716 static unsigned int uic;
3717
3718 /* Called from init_sys_modes, so it happens not very often
3719    but at least each time Emacs is loaded.  */
3720 void
3721 sys_access_reinit ()
3722 {
3723   uic = 0;
3724 }
3725
3726 int
3727 sys_access (filename, type)
3728      char * filename;
3729      int type;
3730 {
3731   struct FAB fab;
3732   struct XABPRO xab;
3733   int status, size, i, typecode, acl_controlled;
3734   unsigned int *aclptr, *aclend, aclbuf[60];
3735   union prvdef prvmask;
3736
3737   /* Get UIC and GRP values for protection checking.  */
3738   if (uic == 0)
3739     {
3740       status = LIB$GETJPI (&JPI$_UIC, 0, 0, &uic, 0, 0);
3741       if (! (status & 1))
3742         return -1;
3743       memid = uic & 0xFFFF;
3744       grpid = uic >> 16;
3745     }
3746
3747   if (type != 2)                /* not checking write access */
3748     return access (filename, type);
3749
3750   /* Check write protection. */
3751
3752 #define CHECKPRIV(bit)    (prvmask.bit)
3753 #define WRITABLE(field)  (! ((xab.xab$w_pro >> field) & XAB$M_NOWRITE))
3754
3755   /* Find privilege bits */
3756   status = SYS$SETPRV (0, 0, 0, prvmask);
3757   if (! (status & 1))
3758     error ("Unable to find privileges: %s", vmserrstr (status));
3759   if (CHECKPRIV (PRV$V_BYPASS))
3760     return 0;                   /* BYPASS enabled */
3761   fab = cc$rms_fab;
3762   fab.fab$b_fac = FAB$M_GET;
3763   fab.fab$l_fna = filename;
3764   fab.fab$b_fns = strlen (filename);
3765   fab.fab$l_xab = &xab;
3766   xab = cc$rms_xabpro;
3767   xab.xab$l_aclbuf = aclbuf;
3768   xab.xab$w_aclsiz = sizeof (aclbuf);
3769   status = SYS$OPEN (&fab, 0, 0);
3770   if (! (status & 1))
3771     return -1;
3772   SYS$CLOSE (&fab, 0, 0);
3773   /* Check system access */
3774   if (CHECKPRIV (PRV$V_SYSPRV) && WRITABLE (XAB$V_SYS))
3775     return 0;
3776   /* Check ACL entries, if any */
3777   acl_controlled = 0;
3778   if (xab.xab$w_acllen > 0)
3779     {
3780       aclptr = aclbuf;
3781       aclend = &aclbuf[xab.xab$w_acllen / 4];
3782       while (*aclptr && aclptr < aclend)
3783         {
3784           size = (*aclptr & 0xff) / 4;
3785           typecode = (*aclptr >> 8) & 0xff;
3786           if (typecode == ACE$C_KEYID)
3787             for (i = size - 1; i > 1; i--)
3788               if (aclptr[i] == uic)
3789                 {
3790                   acl_controlled = 1;
3791                   if (aclptr[1] & ACE$M_WRITE)
3792                     return 0;   /* Write access through ACL */
3793                 }
3794           aclptr = &aclptr[size];
3795         }
3796       if (acl_controlled)       /* ACL specified, prohibits write access */
3797         return -1;
3798     }
3799   /* No ACL entries specified, check normal protection */
3800   if (WRITABLE (XAB$V_WLD))     /* World writable */
3801     return 0;
3802   if (WRITABLE (XAB$V_GRP) &&
3803       (unsigned short) (xab.xab$l_uic >> 16) == grpid)
3804     return 0;                   /* Group writable */
3805   if (WRITABLE (XAB$V_OWN) &&
3806       (xab.xab$l_uic & 0xFFFF) == memid)
3807     return 0;                   /* Owner writable */
3808
3809   return -1;    /* Not writable */
3810 }
3811 #endif /* not VMS4_4 */
3812 #endif /* access */
3813
3814 static char vtbuf[NAM$C_MAXRSS+1];
3815
3816 /* translate a vms file spec to a unix path */
3817 char *
3818 sys_translate_vms (vfile)
3819      char * vfile;
3820 {
3821   char * p;
3822   char * targ;
3823
3824   if (!vfile)
3825     return 0;
3826
3827   targ = vtbuf;
3828
3829   /* leading device or logical name is a root directory */
3830   if (p = strchr (vfile, ':'))
3831     {
3832       *targ++ = '/';
3833       while (vfile < p)
3834         *targ++ = *vfile++;
3835       vfile++;
3836       *targ++ = '/';
3837     }
3838   p = vfile;
3839   if (*p == '[' || *p == '<')
3840     {
3841       while (*++vfile != *p + 2)
3842         switch (*vfile)
3843           {
3844           case '.':
3845             if (vfile[-1] == *p)
3846               *targ++ = '.';
3847             *targ++ = '/';
3848             break;
3849
3850           case '-':
3851             *targ++ = '.';
3852             *targ++ = '.';
3853             break;
3854
3855           default:
3856             *targ++ = *vfile;
3857             break;
3858           }
3859       vfile++;
3860       *targ++ = '/';
3861     }
3862   while (*vfile)
3863     *targ++ = *vfile++;
3864
3865   return vtbuf;
3866 }
3867
3868 static char utbuf[NAM$C_MAXRSS+1];
3869
3870 /* translate a unix path to a VMS file spec */
3871 char *
3872 sys_translate_unix (ufile)
3873      char * ufile;
3874 {
3875   int slash_seen = 0;
3876   char *p;
3877   char * targ;
3878
3879   if (!ufile)
3880     return 0;
3881
3882   targ = utbuf;
3883
3884   if (*ufile == '/')
3885     {
3886       ufile++;
3887     }
3888
3889   while (*ufile)
3890     {
3891       switch (*ufile)
3892         {
3893         case '/':
3894           if (slash_seen)
3895             if (index (&ufile[1], '/'))
3896               *targ++ = '.';
3897             else
3898               *targ++ = ']';
3899           else
3900             {
3901               *targ++ = ':';
3902               if (index (&ufile[1], '/'))
3903                 *targ++ = '[';
3904               slash_seen = 1;
3905             }
3906           break;
3907
3908         case '.':
3909           if (strncmp (ufile, "./", 2) == 0)
3910             {
3911               if (!slash_seen)
3912                 {
3913                   *targ++ = '[';
3914                   slash_seen = 1;
3915                 }
3916               ufile++;          /* skip the dot */
3917               if (index (&ufile[1], '/'))
3918                 *targ++ = '.';
3919               else
3920                 *targ++ = ']';
3921             }
3922           else if (strncmp (ufile, "../", 3) == 0)
3923             {
3924               if (!slash_seen)
3925                 {
3926                   *targ++ = '[';
3927                   slash_seen = 1;
3928                 }
3929               *targ++ = '-';
3930               ufile += 2;       /* skip the dots */
3931               if (index (&ufile[1], '/'))
3932                 *targ++ = '.';
3933               else
3934                 *targ++ = ']';
3935             }
3936           else
3937             *targ++ = *ufile;
3938           break;
3939
3940         default:
3941           *targ++ = *ufile;
3942           break;
3943         }
3944       ufile++;
3945     }
3946   *targ = '\0';
3947
3948   return utbuf;
3949 }
3950
3951 char *
3952 getwd (pathname)
3953      char *pathname;
3954 {
3955   char *ptr, *val;
3956   extern char *getcwd ();
3957
3958 #define MAXPATHLEN 1024
3959
3960   ptr = xmalloc (MAXPATHLEN);
3961   val = getcwd (ptr, MAXPATHLEN);
3962   if (val == 0)
3963     {
3964       xfree (ptr);
3965       return val;
3966     }
3967   strcpy (pathname, ptr);
3968   xfree (ptr);
3969
3970  return pathname;
3971 }
3972
3973 int
3974 getppid ()
3975 {
3976   long item_code = JPI$_OWNER;
3977   unsigned long parent_id;
3978   int status;
3979
3980   if (((status = LIB$GETJPI (&item_code, 0, 0, &parent_id)) & 1) == 0)
3981     {
3982       errno = EVMSERR;
3983       vaxc$errno = status;
3984       return -1;
3985     }
3986   return parent_id;
3987 }
3988
3989 #undef getuid
3990 unsigned
3991 sys_getuid ()
3992 {
3993   return (getgid () << 16) | getuid ();
3994 }
3995
3996 #undef read
3997 int
3998 sys_read (fildes, buf, nbyte)
3999      int fildes;
4000      char *buf;
4001      unsigned int nbyte;
4002 {
4003   return read (fildes, buf, (nbyte < MAXIOSIZE ? nbyte : MAXIOSIZE));
4004 }
4005
4006 /*
4007  *      VAX/VMS VAX C RTL really loses. It insists that records
4008  *      end with a newline (carriage return) character, and if they
4009  *      don't it adds one (nice of it isn't it!)
4010  *
4011  *      Thus we do this stupidity below.
4012  */
4013
4014 #undef write
4015 int
4016 sys_write (fildes, buf, nbytes)
4017      int fildes;
4018      char *buf;
4019      unsigned int nbytes;
4020 {
4021   register char *p;
4022   register char *e;
4023   int sum = 0;
4024   struct stat st;
4025
4026   fstat (fildes, &st);
4027   p = buf;
4028   while (nbytes > 0)
4029     {
4030       int len, retval;
4031
4032       /* Handle fixed-length files with carriage control.  */
4033       if (st.st_fab_rfm == FAB$C_FIX
4034           && ((st.st_fab_rat & (FAB$M_FTN | FAB$M_CR)) != 0))
4035         {
4036           len = st.st_fab_mrs;
4037           retval = write (fildes, p, min (len, nbytes));
4038           if (retval != len)
4039             return -1;
4040           retval++;     /* This skips the implied carriage control */
4041         }
4042       else
4043         {
4044           e =  p + min (MAXIOSIZE, nbytes) - 1;
4045           while (*e != '\n' && e > p) e--;
4046           if (p == e)           /* Ok.. so here we add a newline... sigh. */
4047             e = p + min (MAXIOSIZE, nbytes) - 1;
4048           len = e + 1 - p;
4049           retval = write (fildes, p, len);
4050           if (retval != len)
4051             return -1;
4052         }
4053       p += retval;
4054       sum += retval;
4055       nbytes -= retval;
4056     }
4057   return sum;
4058 }
4059
4060 /* Create file NEW copying its attributes from file OLD.  If
4061    OLD is 0 or does not exist, create based on the value of
4062    vms_stmlf_recfm. */
4063
4064 /* Protection value the file should ultimately have.
4065    Set by create_copy_attrs, and use by rename_sansversions.  */
4066 static unsigned short int fab_final_pro;
4067
4068 int
4069 creat_copy_attrs (old, new)
4070      char *old, *new;
4071 {
4072   struct FAB fab = cc$rms_fab;
4073   struct XABPRO xabpro;
4074   char aclbuf[256];     /* Choice of size is arbitrary.  See below. */
4075   extern int vms_stmlf_recfm;
4076
4077   if (old)
4078     {
4079       fab.fab$b_fac = FAB$M_GET;
4080       fab.fab$l_fna = old;
4081       fab.fab$b_fns = strlen (old);
4082       fab.fab$l_xab = (char *) &xabpro;
4083       xabpro = cc$rms_xabpro;
4084       xabpro.xab$l_aclbuf = aclbuf;
4085       xabpro.xab$w_aclsiz = sizeof aclbuf;
4086       /* Call $OPEN to fill in the fab & xabpro fields. */
4087       if (SYS$OPEN (&fab, 0, 0) & 1)
4088         {
4089           SYS$CLOSE (&fab, 0, 0);
4090           fab.fab$l_alq = 0;    /* zero the allocation quantity */
4091           if (xabpro.xab$w_acllen > 0)
4092             {
4093               if (xabpro.xab$w_acllen > sizeof aclbuf)
4094                 /* If the acl buffer was too short, redo open with longer one.
4095                    Wouldn't need to do this if there were some system imposed
4096                    limit on the size of an ACL, but I can't find any such. */
4097                 {
4098                   xabpro.xab$l_aclbuf = (char *) alloca (xabpro.xab$w_acllen);
4099                   xabpro.xab$w_aclsiz = xabpro.xab$w_acllen;
4100                   if (SYS$OPEN (&fab, 0, 0) & 1)
4101                     SYS$CLOSE (&fab, 0, 0);
4102                   else
4103                     old = 0;
4104                 }
4105             }
4106           else
4107             xabpro.xab$l_aclbuf = 0;
4108         }
4109       else
4110         old = 0;
4111     }
4112   fab.fab$l_fna = new;
4113   fab.fab$b_fns = strlen (new);
4114   if (!old)
4115     {
4116       fab.fab$l_xab = 0;
4117       fab.fab$b_rfm = vms_stmlf_recfm ? FAB$C_STMLF : FAB$C_VAR;
4118       fab.fab$b_rat = FAB$M_CR;
4119     }
4120
4121   /* Set the file protections such that we will be able to manipulate
4122      this file.  Once we are done writing and renaming it, we will set
4123      the protections back.  */
4124   if (old)
4125     fab_final_pro = xabpro.xab$w_pro;
4126   else
4127     SYS$SETDFPROT (0, &fab_final_pro);
4128   xabpro.xab$w_pro &= 0xff0f; /* set O:rewd for now. This is set back later. */
4129
4130   /* Create the new file with either default attrs or attrs copied
4131      from old file. */
4132   if (!(SYS$CREATE (&fab, 0, 0) & 1))
4133     return -1;
4134   SYS$CLOSE (&fab, 0, 0);
4135   /* As this is a "replacement" for creat, return a file descriptor
4136      opened for writing. */
4137   return open (new, O_WRONLY);
4138 }
4139
4140 #ifdef creat
4141 #undef creat
4142 #include <varargs.h>
4143 #ifdef __GNUC__
4144 #ifndef va_count
4145 #define va_count(X) ((X) = *(((int *) &(va_alist)) - 1))
4146 #endif
4147 #endif
4148
4149 int
4150 sys_creat (va_alist)
4151      va_dcl
4152 {
4153   va_list list_incrementer;
4154   char *name;
4155   int mode;
4156   int rfd;                      /* related file descriptor */
4157   int fd;                       /* Our new file descriptor */
4158   int count;
4159   struct stat st_buf;
4160   char rfm[12];
4161   char rat[15];
4162   char mrs[13];
4163   char fsz[13];
4164   extern int vms_stmlf_recfm;
4165
4166   va_count (count);
4167   va_start (list_incrementer);
4168   name = va_arg (list_incrementer, char *);
4169   mode = va_arg (list_incrementer, int);
4170   if (count > 2)
4171     rfd = va_arg (list_incrementer, int);
4172   va_end (list_incrementer);
4173   if (count > 2)
4174     {
4175       /* Use information from the related file descriptor to set record
4176          format of the newly created file. */
4177       fstat (rfd, &st_buf);
4178       switch (st_buf.st_fab_rfm)
4179         {
4180         case FAB$C_FIX:
4181           strcpy (rfm, "rfm = fix");
4182           sprintf (mrs, "mrs = %d", st_buf.st_fab_mrs);
4183           strcpy (rat, "rat = ");
4184           if (st_buf.st_fab_rat & FAB$M_CR)
4185             strcat (rat, "cr");
4186           else if (st_buf.st_fab_rat & FAB$M_FTN)
4187             strcat (rat, "ftn");
4188           else if (st_buf.st_fab_rat & FAB$M_PRN)
4189             strcat (rat, "prn");
4190           if (st_buf.st_fab_rat & FAB$M_BLK)
4191             if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4192               strcat (rat, ", blk");
4193             else
4194               strcat (rat, "blk");
4195           return creat (name, 0, rfm, rat, mrs);
4196
4197         case FAB$C_VFC:
4198           strcpy (rfm, "rfm = vfc");
4199           sprintf (fsz, "fsz = %d", st_buf.st_fab_fsz);
4200           strcpy (rat, "rat = ");
4201           if (st_buf.st_fab_rat & FAB$M_CR)
4202             strcat (rat, "cr");
4203           else if (st_buf.st_fab_rat & FAB$M_FTN)
4204             strcat (rat, "ftn");
4205           else if (st_buf.st_fab_rat & FAB$M_PRN)
4206             strcat (rat, "prn");
4207           if (st_buf.st_fab_rat & FAB$M_BLK)
4208             if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4209               strcat (rat, ", blk");
4210             else
4211               strcat (rat, "blk");
4212           return creat (name, 0, rfm, rat, fsz);
4213
4214         case FAB$C_STM:
4215           strcpy (rfm, "rfm = stm");
4216           break;
4217
4218         case FAB$C_STMCR:
4219           strcpy (rfm, "rfm = stmcr");
4220           break;
4221
4222         case FAB$C_STMLF:
4223           strcpy (rfm, "rfm = stmlf");
4224           break;
4225
4226         case FAB$C_UDF:
4227           strcpy (rfm, "rfm = udf");
4228           break;
4229
4230         case FAB$C_VAR:
4231           strcpy (rfm, "rfm = var");
4232           break;
4233         }
4234       strcpy (rat, "rat = ");
4235       if (st_buf.st_fab_rat & FAB$M_CR)
4236         strcat (rat, "cr");
4237       else if (st_buf.st_fab_rat & FAB$M_FTN)
4238         strcat (rat, "ftn");
4239       else if (st_buf.st_fab_rat & FAB$M_PRN)
4240         strcat (rat, "prn");
4241       if (st_buf.st_fab_rat & FAB$M_BLK)
4242         if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4243           strcat (rat, ", blk");
4244         else
4245           strcat (rat, "blk");
4246     }
4247   else
4248     {
4249       strcpy (rfm, vms_stmlf_recfm ? "rfm = stmlf" : "rfm=var");
4250       strcpy (rat, "rat=cr");
4251     }
4252   /* Until the VAX C RTL fixes the many bugs with modes, always use
4253      mode 0 to get the user's default protection. */
4254   fd = creat (name, 0, rfm, rat);
4255   if (fd < 0 && errno == EEXIST)
4256     {
4257       if (unlink (name) < 0)
4258         report_file_error ("delete", build_string (name));
4259       fd = creat (name, 0, rfm, rat);
4260     }
4261   return fd;
4262 }
4263 #endif /* creat */
4264
4265 /* fwrite to stdout is S L O W.  Speed it up by using fputc...*/
4266 int
4267 sys_fwrite (ptr, size, num, fp)
4268      register char * ptr;
4269      FILE * fp;
4270 {
4271   register int tot = num * size;
4272
4273   while (tot--)
4274     fputc (*ptr++, fp);
4275   return num;
4276 }
4277
4278 /*
4279  * The VMS C library routine creat actually creates a new version of an
4280  * existing file rather than truncating the old version.  There are times
4281  * when this is not the desired behavior, for instance, when writing an
4282  * auto save file (you only want one version), or when you don't have
4283  * write permission in the directory containing the file (but the file
4284  * itself is writable).  Hence this routine, which is equivalent to
4285  * "close (creat (fn, 0));" on Unix if fn already exists.
4286  */
4287 int
4288 vms_truncate (fn)
4289      char *fn;
4290 {
4291   struct FAB xfab = cc$rms_fab;
4292   struct RAB xrab = cc$rms_rab;
4293   int status;
4294
4295   xfab.fab$l_fop = FAB$M_TEF;   /* free allocated but unused blocks on close */
4296   xfab.fab$b_fac = FAB$M_TRN | FAB$M_GET; /* allow truncate and get access */
4297   xfab.fab$b_shr = FAB$M_NIL;   /* allow no sharing - file must be locked */
4298   xfab.fab$l_fna = fn;
4299   xfab.fab$b_fns = strlen (fn);
4300   xfab.fab$l_dna = ";0";        /* default to latest version of the file */
4301   xfab.fab$b_dns = 2;
4302   xrab.rab$l_fab = &xfab;
4303
4304   /* This gibberish opens the file, positions to the first record, and
4305      deletes all records from there until the end of file. */
4306   if ((SYS$OPEN (&xfab) & 01) == 01)
4307     {
4308       if ((SYS$CONNECT (&xrab) & 01) == 01 &&
4309           (SYS$FIND (&xrab) & 01) == 01 &&
4310           (SYS$TRUNCATE (&xrab) & 01) == 01)
4311         status = 0;
4312       else
4313         status = -1;
4314     }
4315   else
4316     status = -1;
4317   SYS$CLOSE (&xfab);
4318   return status;
4319 }
4320
4321 /* Define this symbol to actually read SYSUAF.DAT.  This requires either
4322    SYSPRV or a readable SYSUAF.DAT. */
4323
4324 #ifdef READ_SYSUAF
4325 /*
4326  * getuaf.c
4327  *
4328  * Routine to read the VMS User Authorization File and return
4329  * a specific user's record.
4330  */
4331
4332 static struct UAF retuaf;
4333
4334 struct UAF *
4335 get_uaf_name (uname)
4336      char * uname;
4337 {
4338   register status;
4339   struct FAB uaf_fab;
4340   struct RAB uaf_rab;
4341
4342   uaf_fab = cc$rms_fab;
4343   uaf_rab = cc$rms_rab;
4344   /* initialize fab fields */
4345   uaf_fab.fab$l_fna = "SYS$SYSTEM:SYSUAF.DAT";
4346   uaf_fab.fab$b_fns = 21;
4347   uaf_fab.fab$b_fac = FAB$M_GET;
4348   uaf_fab.fab$b_org = FAB$C_IDX;
4349   uaf_fab.fab$b_shr = FAB$M_GET|FAB$M_PUT|FAB$M_UPD|FAB$M_DEL;
4350   /* initialize rab fields */
4351   uaf_rab.rab$l_fab = &uaf_fab;
4352   /* open the User Authorization File */
4353   status = SYS$OPEN (&uaf_fab);
4354   if (!(status&1))
4355     {
4356       errno = EVMSERR;
4357       vaxc$errno = status;
4358       return 0;
4359     }
4360   status = SYS$CONNECT (&uaf_rab);
4361   if (!(status&1))
4362     {
4363       errno = EVMSERR;
4364       vaxc$errno = status;
4365       return 0;
4366     }
4367   /* read the requested record - index is in uname */
4368   uaf_rab.rab$l_kbf = uname;
4369   uaf_rab.rab$b_ksz = strlen (uname);
4370   uaf_rab.rab$b_rac = RAB$C_KEY;
4371   uaf_rab.rab$l_ubf = (char *)&retuaf;
4372   uaf_rab.rab$w_usz = sizeof retuaf;
4373   status = SYS$GET (&uaf_rab);
4374   if (!(status&1))
4375     {
4376       errno = EVMSERR;
4377       vaxc$errno = status;
4378       return 0;
4379     }
4380   /* close the User Authorization File */
4381   status = SYS$DISCONNECT (&uaf_rab);
4382   if (!(status&1))
4383     {
4384       errno = EVMSERR;
4385       vaxc$errno = status;
4386       return 0;
4387     }
4388   status = SYS$CLOSE (&uaf_fab);
4389   if (!(status&1))
4390     {
4391       errno = EVMSERR;
4392       vaxc$errno = status;
4393       return 0;
4394     }
4395   return &retuaf;
4396 }
4397
4398 struct UAF *
4399 get_uaf_uic (uic)
4400      unsigned long uic;
4401 {
4402   register status;
4403   struct FAB uaf_fab;
4404   struct RAB uaf_rab;
4405
4406   uaf_fab = cc$rms_fab;
4407   uaf_rab = cc$rms_rab;
4408   /* initialize fab fields */
4409   uaf_fab.fab$l_fna = "SYS$SYSTEM:SYSUAF.DAT";
4410   uaf_fab.fab$b_fns = 21;
4411   uaf_fab.fab$b_fac = FAB$M_GET;
4412   uaf_fab.fab$b_org = FAB$C_IDX;
4413   uaf_fab.fab$b_shr = FAB$M_GET|FAB$M_PUT|FAB$M_UPD|FAB$M_DEL;
4414   /* initialize rab fields */
4415   uaf_rab.rab$l_fab = &uaf_fab;
4416   /* open the User Authorization File */
4417   status = SYS$OPEN (&uaf_fab);
4418   if (!(status&1))
4419     {
4420       errno = EVMSERR;
4421       vaxc$errno = status;
4422       return 0;
4423     }
4424   status = SYS$CONNECT (&uaf_rab);
4425   if (!(status&1))
4426     {
4427       errno = EVMSERR;
4428       vaxc$errno = status;
4429       return 0;
4430     }
4431   /* read the requested record - index is in uic */
4432   uaf_rab.rab$b_krf = 1;        /* 1st alternate key */
4433   uaf_rab.rab$l_kbf = (char *) &uic;
4434   uaf_rab.rab$b_ksz = sizeof uic;
4435   uaf_rab.rab$b_rac = RAB$C_KEY;
4436   uaf_rab.rab$l_ubf = (char *)&retuaf;
4437   uaf_rab.rab$w_usz = sizeof retuaf;
4438   status = SYS$GET (&uaf_rab);
4439   if (!(status&1))
4440     {
4441       errno = EVMSERR;
4442       vaxc$errno = status;
4443       return 0;
4444     }
4445   /* close the User Authorization File */
4446   status = SYS$DISCONNECT (&uaf_rab);
4447   if (!(status&1))
4448     {
4449       errno = EVMSERR;
4450       vaxc$errno = status;
4451       return 0;
4452     }
4453   status = SYS$CLOSE (&uaf_fab);
4454   if (!(status&1))
4455     {
4456       errno = EVMSERR;
4457       vaxc$errno = status;
4458       return 0;
4459     }
4460   return &retuaf;
4461 }
4462
4463 static struct passwd retpw;
4464
4465 struct passwd *
4466 cnv_uaf_pw (up)
4467      struct UAF * up;
4468 {
4469   char * ptr;
4470
4471   /* copy these out first because if the username is 32 chars, the next
4472      section will overwrite the first byte of the UIC */
4473   retpw.pw_uid = up->uaf$w_mem;
4474   retpw.pw_gid = up->uaf$w_grp;
4475
4476   /* I suppose this is not the best style, to possibly overwrite one
4477      byte beyond the end of the field, but what the heck... */
4478   ptr = &up->uaf$t_username[UAF$S_USERNAME];
4479   while (ptr[-1] == ' ')
4480     ptr--;
4481   *ptr = '\0';
4482   strcpy (retpw.pw_name, up->uaf$t_username);
4483
4484   /* the rest of these are counted ascii strings */
4485   strncpy (retpw.pw_gecos, &up->uaf$t_owner[1], up->uaf$t_owner[0]);
4486   retpw.pw_gecos[up->uaf$t_owner[0]] = '\0';
4487   strncpy (retpw.pw_dir, &up->uaf$t_defdev[1], up->uaf$t_defdev[0]);
4488   retpw.pw_dir[up->uaf$t_defdev[0]] = '\0';
4489   strncat (retpw.pw_dir, &up->uaf$t_defdir[1], up->uaf$t_defdir[0]);
4490   retpw.pw_dir[up->uaf$t_defdev[0] + up->uaf$t_defdir[0]] = '\0';
4491   strncpy (retpw.pw_shell, &up->uaf$t_defcli[1], up->uaf$t_defcli[0]);
4492   retpw.pw_shell[up->uaf$t_defcli[0]] = '\0';
4493
4494   return &retpw;
4495 }
4496 #else /* not READ_SYSUAF */
4497 static struct passwd retpw;
4498 #endif /* not READ_SYSUAF */
4499
4500 struct passwd *
4501 getpwnam (name)
4502      char * name;
4503 {
4504 #ifdef READ_SYSUAF
4505   struct UAF *up;
4506 #else
4507   char * user;
4508   char * dir;
4509   unsigned char * full;
4510 #endif /* READ_SYSUAF */
4511   char *ptr = name;
4512
4513   while (*ptr)
4514     {
4515       if ('a' <= *ptr && *ptr <= 'z')
4516         *ptr -= 040;
4517       ptr++;
4518     }
4519 #ifdef READ_SYSUAF
4520   if (!(up = get_uaf_name (name)))
4521     return 0;
4522   return cnv_uaf_pw (up);
4523 #else
4524   if (strcmp (name, getenv ("USER")) == 0)
4525     {
4526       retpw.pw_uid = getuid ();
4527       retpw.pw_gid = getgid ();
4528       strcpy (retpw.pw_name, name);
4529       if (full = egetenv ("FULLNAME"))
4530         strcpy (retpw.pw_gecos, full);
4531       else
4532         *retpw.pw_gecos = '\0';
4533       strcpy (retpw.pw_dir, egetenv ("HOME"));
4534       *retpw.pw_shell = '\0';
4535       return &retpw;
4536     }
4537   else
4538     return 0;
4539 #endif /* not READ_SYSUAF */
4540 }
4541
4542 struct passwd *
4543 getpwuid (uid)
4544      unsigned long uid;
4545 {
4546 #ifdef READ_SYSUAF
4547   struct UAF * up;
4548
4549   if (!(up = get_uaf_uic (uid)))
4550     return 0;
4551   return cnv_uaf_pw (up);
4552 #else
4553   if (uid == sys_getuid ())
4554     return getpwnam (egetenv ("USER"));
4555   else
4556     return 0;
4557 #endif /* not READ_SYSUAF */
4558 }
4559
4560 /* return total address space available to the current process.  This is
4561    the sum of the current p0 size, p1 size and free page table entries
4562    available. */
4563 int
4564 vlimit ()
4565 {
4566   int item_code;
4567   unsigned long free_pages;
4568   unsigned long frep0va;
4569   unsigned long frep1va;
4570   register status;
4571
4572   item_code = JPI$_FREPTECNT;
4573   if (((status = LIB$GETJPI (&item_code, 0, 0, &free_pages)) & 1) == 0)
4574     {
4575       errno = EVMSERR;
4576       vaxc$errno = status;
4577       return -1;
4578     }
4579   free_pages *= 512;
4580
4581   item_code = JPI$_FREP0VA;
4582   if (((status = LIB$GETJPI (&item_code, 0, 0, &frep0va)) & 1) == 0)
4583     {
4584       errno = EVMSERR;
4585       vaxc$errno = status;
4586       return -1;
4587     }
4588   item_code = JPI$_FREP1VA;
4589   if (((status = LIB$GETJPI (&item_code, 0, 0, &frep1va)) & 1) == 0)
4590     {
4591       errno = EVMSERR;
4592       vaxc$errno = status;
4593       return -1;
4594     }
4595
4596   return free_pages + frep0va + (0x7fffffff - frep1va);
4597 }
4598
4599 int
4600 define_logical_name (varname, string)
4601      char *varname;
4602      char *string;
4603 {
4604   struct dsc$descriptor_s strdsc =
4605     {strlen (string), DSC$K_DTYPE_T, DSC$K_CLASS_S, string};
4606   struct dsc$descriptor_s envdsc =
4607     {strlen (varname), DSC$K_DTYPE_T, DSC$K_CLASS_S, varname};
4608   struct dsc$descriptor_s lnmdsc =
4609     {7, DSC$K_DTYPE_T, DSC$K_CLASS_S, "LNM$JOB"};
4610
4611   return LIB$SET_LOGICAL (&envdsc, &strdsc, &lnmdsc, 0, 0);
4612 }
4613
4614 int
4615 delete_logical_name (varname)
4616      char *varname;
4617 {
4618   struct dsc$descriptor_s envdsc =
4619     {strlen (varname), DSC$K_DTYPE_T, DSC$K_CLASS_S, varname};
4620   struct dsc$descriptor_s lnmdsc =
4621     {7, DSC$K_DTYPE_T, DSC$K_CLASS_S, "LNM$JOB"};
4622
4623   return LIB$DELETE_LOGICAL (&envdsc, &lnmdsc);
4624 }
4625
4626 int
4627 ulimit ()
4628 {
4629   return 0;
4630 }
4631
4632 int
4633 setpgrp ()
4634 {
4635   return 0;
4636 }
4637
4638 int
4639 execvp ()
4640 {
4641   error ("execvp system call not implemented");
4642   return -1;
4643 }
4644
4645 int
4646 rename (from, to)
4647      char *from, *to;
4648 {
4649   int status;
4650   struct FAB from_fab = cc$rms_fab, to_fab = cc$rms_fab;
4651   struct NAM from_nam = cc$rms_nam, to_nam = cc$rms_nam;
4652   char from_esn[NAM$C_MAXRSS];
4653   char to_esn[NAM$C_MAXRSS];
4654
4655   from_fab.fab$l_fna = from;
4656   from_fab.fab$b_fns = strlen (from);
4657   from_fab.fab$l_nam = &from_nam;
4658   from_fab.fab$l_fop = FAB$M_NAM;
4659
4660   from_nam.nam$l_esa = from_esn;
4661   from_nam.nam$b_ess = sizeof from_esn;
4662
4663   to_fab.fab$l_fna = to;
4664   to_fab.fab$b_fns = strlen (to);
4665   to_fab.fab$l_nam = &to_nam;
4666   to_fab.fab$l_fop = FAB$M_NAM;
4667
4668   to_nam.nam$l_esa = to_esn;
4669   to_nam.nam$b_ess = sizeof to_esn;
4670
4671   status = SYS$RENAME (&from_fab, 0, 0, &to_fab);
4672
4673   if (status & 1)
4674     return 0;
4675   else
4676     {
4677       if (status == RMS$_DEV)
4678         errno = EXDEV;
4679       else
4680         errno = EVMSERR;
4681       vaxc$errno = status;
4682       return -1;
4683     }
4684 }
4685
4686 /* This function renames a file like `rename', but it strips
4687    the version number from the "to" filename, such that the "to" file is
4688    will always be a new version.  It also sets the file protection once it is
4689    finished.  The protection that we will use is stored in fab_final_pro,
4690    and was set when we did a creat_copy_attrs to create the file that we
4691    are renaming.
4692
4693    We could use the chmod function, but Eunichs uses 3 bits per user category
4694    to describe the protection, and VMS uses 4 (write and delete are separate
4695    bits).  To maintain portability, the VMS implementation of `chmod' wires
4696    the W and D bits together.  */
4697
4698
4699 static struct fibdef fib;       /* We need this initialized to zero */
4700 char vms_file_written[NAM$C_MAXRSS];
4701
4702 int
4703 rename_sans_version (from,to)
4704      char *from, *to;
4705 {
4706   short int chan;
4707   int stat;
4708   short int iosb[4];
4709   int status;
4710   struct FAB to_fab = cc$rms_fab;
4711   struct NAM to_nam = cc$rms_nam;
4712   struct dsc$descriptor fib_d ={sizeof (fib),0,0,(char*) &fib};
4713   struct dsc$descriptor fib_attr[2]
4714     = {{sizeof (fab_final_pro),ATR$C_FPRO,0,(char*) &fab_final_pro},{0,0,0,0}};
4715   char to_esn[NAM$C_MAXRSS];
4716
4717   $DESCRIPTOR (disk,to_esn);
4718
4719   to_fab.fab$l_fna = to;
4720   to_fab.fab$b_fns = strlen (to);
4721   to_fab.fab$l_nam = &to_nam;
4722   to_fab.fab$l_fop = FAB$M_NAM;
4723
4724   to_nam.nam$l_esa = to_esn;
4725   to_nam.nam$b_ess = sizeof to_esn;
4726
4727   status = SYS$PARSE (&to_fab, 0, 0); /* figure out the full file name */
4728
4729   if (to_nam.nam$l_fnb && NAM$M_EXP_VER)
4730     *(to_nam.nam$l_ver) = '\0';
4731
4732   stat = rename (from, to_esn);
4733   if (stat < 0)
4734     return stat;
4735
4736   strcpy (vms_file_written, to_esn);
4737
4738   to_fab.fab$l_fna = vms_file_written; /* this points to the versionless name */
4739   to_fab.fab$b_fns = strlen (vms_file_written);
4740
4741   /* Now set the file protection to the correct value */
4742   SYS$OPEN (&to_fab, 0, 0);     /* This fills in the nam$w_fid fields */
4743
4744   /* Copy these fields into the fib */
4745   fib.fib$r_fid_overlay.fib$w_fid[0] = to_nam.nam$w_fid[0];
4746   fib.fib$r_fid_overlay.fib$w_fid[1] = to_nam.nam$w_fid[1];
4747   fib.fib$r_fid_overlay.fib$w_fid[2] = to_nam.nam$w_fid[2];
4748
4749   SYS$CLOSE (&to_fab, 0, 0);
4750
4751   stat = SYS$ASSIGN (&disk, &chan, 0, 0); /* open a channel to the disk */
4752   if (!stat)
4753     LIB$SIGNAL (stat);
4754   stat = SYS$QIOW (0, chan, IO$_MODIFY, iosb, 0, 0, &fib_d,
4755                    0, 0, 0, &fib_attr, 0);
4756   if (!stat)
4757     LIB$SIGNAL (stat);
4758   stat = SYS$DASSGN (chan);
4759   if (!stat)
4760     LIB$SIGNAL (stat);
4761   strcpy (vms_file_written, to_esn); /* We will write this to the terminal*/
4762   return 0;
4763 }
4764
4765 int
4766 link (file, new)
4767      char * file, * new;
4768 {
4769   register status;
4770   struct FAB fab;
4771   struct NAM nam;
4772   unsigned short fid[3];
4773   char esa[NAM$C_MAXRSS];
4774
4775   fab = cc$rms_fab;
4776   fab.fab$l_fop = FAB$M_OFP;
4777   fab.fab$l_fna = file;
4778   fab.fab$b_fns = strlen (file);
4779   fab.fab$l_nam = &nam;
4780
4781   nam = cc$rms_nam;
4782   nam.nam$l_esa = esa;
4783   nam.nam$b_ess = NAM$C_MAXRSS;
4784
4785   status = SYS$PARSE (&fab);
4786   if ((status & 1) == 0)
4787     {
4788       errno = EVMSERR;
4789       vaxc$errno = status;
4790       return -1;
4791     }
4792   status = SYS$SEARCH (&fab);
4793   if ((status & 1) == 0)
4794     {
4795       errno = EVMSERR;
4796       vaxc$errno = status;
4797       return -1;
4798     }
4799
4800   fid[0] = nam.nam$w_fid[0];
4801   fid[1] = nam.nam$w_fid[1];
4802   fid[2] = nam.nam$w_fid[2];
4803
4804   fab.fab$l_fna = new;
4805   fab.fab$b_fns = strlen (new);
4806
4807   status = SYS$PARSE (&fab);
4808   if ((status & 1) == 0)
4809     {
4810       errno = EVMSERR;
4811       vaxc$errno = status;
4812       return -1;
4813     }
4814
4815   nam.nam$w_fid[0] = fid[0];
4816   nam.nam$w_fid[1] = fid[1];
4817   nam.nam$w_fid[2] = fid[2];
4818
4819   nam.nam$l_esa = nam.nam$l_name;
4820   nam.nam$b_esl = nam.nam$b_name + nam.nam$b_type + nam.nam$b_ver;
4821
4822   status = SYS$ENTER (&fab);
4823   if ((status & 1) == 0)
4824     {
4825       errno = EVMSERR;
4826       vaxc$errno = status;
4827       return -1;
4828     }
4829
4830   return 0;
4831 }
4832
4833 void
4834 croak (badfunc)
4835      char *badfunc;
4836 {
4837   printf ("%s not yet implemented\r\n", badfunc);
4838   reset_all_sys_modes ();
4839   exit (1);
4840 }
4841
4842 long
4843 random ()
4844 {
4845   /* Arrange to return a range centered on zero.  */
4846   return rand () - (1 << 30);
4847 }
4848
4849 void
4850 srandom (seed)
4851 {
4852   srand (seed);
4853 }
4854 #endif /* VMS */
4855 \f
4856 #ifndef BSTRING
4857
4858 #ifndef bzero
4859
4860 void
4861 bzero (b, length)
4862      register char *b;
4863      register int length;
4864 {
4865 #ifdef VMS
4866   short zero = 0;
4867   long max_str = 65535;
4868
4869   while (length > max_str) {
4870     (void) LIB$MOVC5 (&zero, &zero, &zero, &max_str, b);
4871     length -= max_str;
4872     b += max_str;
4873   }
4874   max_str = length;
4875   (void) LIB$MOVC5 (&zero, &zero, &zero, &max_str, b);
4876 #else
4877   while (length-- > 0)
4878     *b++ = 0;
4879 #endif /* not VMS */
4880 }
4881
4882 #endif /* no bzero */
4883 #endif /* BSTRING */
4884
4885 #if (!defined (BSTRING) && !defined (bcopy)) || defined (NEED_BCOPY)
4886 #undef bcopy
4887
4888 /* Saying `void' requires a declaration, above, where bcopy is used
4889    and that declaration causes pain for systems where bcopy is a macro.  */
4890 bcopy (b1, b2, length)
4891      register char *b1;
4892      register char *b2;
4893      register int length;
4894 {
4895 #ifdef VMS
4896   long max_str = 65535;
4897
4898   while (length > max_str) {
4899     (void) LIB$MOVC3 (&max_str, b1, b2);
4900     length -= max_str;
4901     b1 += max_str;
4902     b2 += max_str;
4903   }
4904   max_str = length;
4905   (void) LIB$MOVC3 (&length, b1, b2);
4906 #else
4907   while (length-- > 0)
4908     *b2++ = *b1++;
4909 #endif /* not VMS */
4910 }
4911 #endif /* (!defined (BSTRING) && !defined (bcopy)) || defined (NEED_BCOPY) */
4912
4913 #ifndef BSTRING
4914 #ifndef bcmp
4915 int
4916 bcmp (b1, b2, length)   /* This could be a macro! */
4917      register char *b1;
4918      register char *b2;
4919      register int length;
4920 {
4921 #ifdef VMS
4922   struct dsc$descriptor_s src1 = {length, DSC$K_DTYPE_T, DSC$K_CLASS_S, b1};
4923   struct dsc$descriptor_s src2 = {length, DSC$K_DTYPE_T, DSC$K_CLASS_S, b2};
4924
4925   return STR$COMPARE (&src1, &src2);
4926 #else
4927   while (length-- > 0)
4928     if (*b1++ != *b2++)
4929       return 1;
4930
4931   return 0;
4932 #endif /* not VMS */
4933 }
4934 #endif /* no bcmp */
4935 #endif /* not BSTRING */
4936 \f
4937 #ifndef HAVE_STRSIGNAL
4938 char *
4939 strsignal (code)
4940      int code;
4941 {
4942   char *signame = 0;
4943
4944   if (0 <= code && code < NSIG)
4945     {
4946 #ifdef VMS
4947       signame = sys_errlist[code];
4948 #else
4949       /* Cast to suppress warning if the table has const char *.  */
4950       signame = (char *) sys_siglist[code];
4951 #endif
4952     }
4953
4954   return signame;
4955 }
4956 #endif /* HAVE_STRSIGNAL */
4957 \f
4958 #ifdef HAVE_TERMIOS
4959 /* For make-serial-process  */
4960 int serial_open (char *port)
4961 {
4962   int fd = -1;
4963
4964   fd = emacs_open ((char*) port,
4965                    O_RDWR
4966 #ifdef O_NONBLOCK
4967                    | O_NONBLOCK
4968 #else
4969                    | O_NDELAY
4970 #endif
4971 #ifdef O_NOCTTY
4972                    | O_NOCTTY
4973 #endif
4974                    , 0);
4975   if (fd < 0)
4976     {
4977       error ("Could not open %s: %s",
4978              port, emacs_strerror (errno));
4979     }
4980 #ifdef TIOCEXCL
4981   ioctl (fd, TIOCEXCL, (char *) 0);
4982 #endif
4983
4984   return fd;
4985 }
4986 #endif /* TERMIOS  */
4987
4988 #ifdef HAVE_TERMIOS
4989
4990 #if !defined (HAVE_CFMAKERAW)
4991 /* Workaround for targets which are missing cfmakeraw.  */
4992 /* Pasted from man page.  */
4993 static void cfmakeraw (struct termios *termios_p)
4994 {
4995     termios_p->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
4996     termios_p->c_oflag &= ~OPOST;
4997     termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
4998     termios_p->c_cflag &= ~(CSIZE|PARENB);
4999     termios_p->c_cflag |= CS8;
5000 }
5001 #endif /* !defined (HAVE_CFMAKERAW */
5002
5003 #if !defined (HAVE_CFSETSPEED)
5004 /* Workaround for targets which are missing cfsetspeed.  */
5005 static int cfsetspeed (struct termios *termios_p, speed_t vitesse)
5006 {
5007   return (cfsetispeed (termios_p, vitesse)
5008           + cfsetospeed (termios_p, vitesse));
5009 }
5010 #endif
5011
5012 /* For serial-process-configure  */
5013 void
5014 serial_configure (struct Lisp_Process *p,
5015                       Lisp_Object contact)
5016 {
5017   Lisp_Object childp2 = Qnil;
5018   Lisp_Object tem = Qnil;
5019   struct termios attr;
5020   int err = -1;
5021   char summary[4] = "???"; /* This usually becomes "8N1".  */
5022
5023   childp2 = Fcopy_sequence (p->childp);
5024
5025   /* Read port attributes and prepare default configuration.  */
5026   err = tcgetattr (p->outfd, &attr);
5027   if (err != 0)
5028     error ("tcgetattr() failed: %s", emacs_strerror (errno));
5029   cfmakeraw (&attr);
5030 #if defined (CLOCAL)
5031   attr.c_cflag |= CLOCAL;
5032 #endif
5033 #if defined (CREAD)
5034   attr.c_cflag | CREAD;
5035 #endif
5036
5037   /* Configure speed.  */
5038   if (!NILP (Fplist_member (contact, QCspeed)))
5039     tem = Fplist_get (contact, QCspeed);
5040   else
5041     tem = Fplist_get (p->childp, QCspeed);
5042   CHECK_NUMBER (tem);
5043   err = cfsetspeed (&attr, XINT (tem));
5044   if (err != 0)
5045     error ("cfsetspeed(%d) failed: %s", XINT (tem), emacs_strerror (errno));
5046   childp2 = Fplist_put (childp2, QCspeed, tem);
5047
5048   /* Configure bytesize.  */
5049   if (!NILP (Fplist_member (contact, QCbytesize)))
5050     tem = Fplist_get (contact, QCbytesize);
5051   else
5052     tem = Fplist_get (p->childp, QCbytesize);
5053   if (NILP (tem))
5054     tem = make_number (8);
5055   CHECK_NUMBER (tem);
5056   if (XINT (tem) != 7 && XINT (tem) != 8)
5057     error (":bytesize must be nil (8), 7, or 8");
5058   summary[0] = XINT(tem) + '0';
5059 #if defined (CSIZE) && defined (CS7) && defined (CS8)
5060   attr.c_cflag &= ~CSIZE;
5061   attr.c_cflag |= ((XINT (tem) == 7) ? CS7 : CS8);
5062 #else
5063   /* Don't error on bytesize 8, which should be set by cfmakeraw.  */
5064   if (XINT (tem) != 8)
5065     error ("Bytesize cannot be changed");
5066 #endif
5067   childp2 = Fplist_put (childp2, QCbytesize, tem);
5068
5069   /* Configure parity.  */
5070   if (!NILP (Fplist_member (contact, QCparity)))
5071     tem = Fplist_get (contact, QCparity);
5072   else
5073     tem = Fplist_get (p->childp, QCparity);
5074   if (!NILP (tem) && !EQ (tem, Qeven) && !EQ (tem, Qodd))
5075     error (":parity must be nil (no parity), `even', or `odd'");
5076 #if defined (PARENB) && defined (PARODD) && defined (IGNPAR) && defined (INPCK)
5077   attr.c_cflag &= ~(PARENB | PARODD);
5078   attr.c_iflag &= ~(IGNPAR | INPCK);
5079   if (NILP (tem))
5080     {
5081       summary[1] = 'N';
5082     }
5083   else if (EQ (tem, Qeven))
5084     {
5085       summary[1] = 'E';
5086       attr.c_cflag |= PARENB;
5087       attr.c_iflag |= (IGNPAR | INPCK);
5088     }
5089   else if (EQ (tem, Qodd))
5090     {
5091       summary[1] = 'O';
5092       attr.c_cflag |= (PARENB | PARODD);
5093       attr.c_iflag |= (IGNPAR | INPCK);
5094     }
5095 #else
5096   /* Don't error on no parity, which should be set by cfmakeraw.  */
5097   if (!NILP (tem))
5098     error ("Parity cannot be configured");
5099 #endif
5100   childp2 = Fplist_put (childp2, QCparity, tem);
5101
5102   /* Configure stopbits.  */
5103   if (!NILP (Fplist_member (contact, QCstopbits)))
5104     tem = Fplist_get (contact, QCstopbits);
5105   else
5106     tem = Fplist_get (p->childp, QCstopbits);
5107   if (NILP (tem))
5108     tem = make_number (1);
5109   CHECK_NUMBER (tem);
5110   if (XINT (tem) != 1 && XINT (tem) != 2)
5111     error (":stopbits must be nil (1 stopbit), 1, or 2");
5112   summary[2] = XINT (tem) + '0';
5113 #if defined (CSTOPB)
5114   attr.c_cflag &= ~CSTOPB;
5115   if (XINT (tem) == 2)
5116     attr.c_cflag |= CSTOPB;
5117 #else
5118   /* Don't error on 1 stopbit, which should be set by cfmakeraw.  */
5119   if (XINT (tem) != 1)
5120     error ("Stopbits cannot be configured");
5121 #endif
5122   childp2 = Fplist_put (childp2, QCstopbits, tem);
5123
5124   /* Configure flowcontrol.  */
5125   if (!NILP (Fplist_member (contact, QCflowcontrol)))
5126     tem = Fplist_get (contact, QCflowcontrol);
5127   else
5128     tem = Fplist_get (p->childp, QCflowcontrol);
5129   if (!NILP (tem) && !EQ (tem, Qhw) && !EQ (tem, Qsw))
5130     error (":flowcontrol must be nil (no flowcontrol), `hw', or `sw'");
5131 #if defined (CRTSCTS)
5132   attr.c_cflag &= ~CRTSCTS;
5133 #endif
5134 #if defined (CNEW_RTSCTS)
5135   attr.c_cflag &= ~CNEW_RTSCTS;
5136 #endif
5137 #if defined (IXON) && defined (IXOFF)
5138   attr.c_iflag &= ~(IXON | IXOFF);
5139 #endif
5140   if (NILP (tem))
5141     {
5142       /* Already configured.  */
5143     }
5144   else if (EQ (tem, Qhw))
5145     {
5146 #if defined (CRTSCTS)
5147       attr.c_cflag |= CRTSCTS;
5148 #elif defined (CNEW_RTSCTS)
5149       attr.c_cflag |= CNEW_RTSCTS;
5150 #else
5151       error ("Hardware flowcontrol (RTS/CTS) not supported");
5152 #endif
5153     }
5154   else if (EQ (tem, Qsw))
5155     {
5156 #if defined (IXON) && defined (IXOFF)
5157       attr.c_iflag |= (IXON | IXOFF);
5158 #else
5159       error ("Software flowcontrol (XON/XOFF) not supported");
5160 #endif
5161     }
5162   childp2 = Fplist_put (childp2, QCflowcontrol, tem);
5163
5164   /* Activate configuration.  */
5165   err = tcsetattr (p->outfd, TCSANOW, &attr);
5166   if (err != 0)
5167     error ("tcsetattr() failed: %s", emacs_strerror (errno));
5168
5169   childp2 = Fplist_put (childp2, QCsummary, build_string (summary));
5170   p->childp = childp2;
5171
5172 }
5173 #endif /* TERMIOS  */
5174
5175 /* arch-tag: edb43589-4e09-4544-b325-978b5b121dcf
5176    (do not change this comment) */