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[bpt/emacs.git] / src / sysdep.c
1 /* Interfaces to system-dependent kernel and library entries.
2 Copyright (C) 1985, 86, 87, 88, 93, 94, 95 Free Software Foundation, Inc.
3
4 This file is part of GNU Emacs.
5
6 GNU Emacs is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GNU Emacs is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Emacs; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21
22 #include <signal.h>
23 #include <setjmp.h>
24
25 #include <config.h>
26 #include "lisp.h"
27 #include "blockinput.h"
28 #undef NULL
29
30 #define min(x,y) ((x) > (y) ? (y) : (x))
31
32 /* In this file, open, read and write refer to the system calls,
33 not our sugared interfaces sys_open, sys_read and sys_write.
34 Contrariwise, for systems where we use the system calls directly,
35 define sys_read, etc. here as aliases for them. */
36 #ifndef read
37 #define sys_read read
38 #define sys_write write
39 #endif /* `read' is not a macro */
40
41 #undef read
42 #undef write
43
44 #ifdef WINDOWSNT
45 #define read _read
46 #define write _write
47 #include <windows.h>
48 extern int errno;
49 #endif /* not WINDOWSNT */
50
51 #ifndef close
52 #define sys_close close
53 #else
54 #undef close
55 #endif
56
57 #ifndef open
58 #define sys_open open
59 #else /* `open' is a macro */
60 #undef open
61 #endif /* `open' is a macro */
62
63 /* Does anyone other than VMS need this? */
64 #ifndef fwrite
65 #define sys_fwrite fwrite
66 #else
67 #undef fwrite
68 #endif
69
70 #ifndef HAVE_H_ERRNO
71 extern int h_errno;
72 #endif
73
74 #include <stdio.h>
75 #include <sys/types.h>
76 #include <sys/stat.h>
77 #include <errno.h>
78
79 /* Get _POSIX_VDISABLE, if it is available. */
80 #ifdef HAVE_UNISTD_H
81 #include <unistd.h>
82 #endif
83
84 #ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
85 #include <dos.h>
86 #include "dosfns.h"
87 #include "msdos.h"
88 #include <sys/param.h>
89 #endif
90
91 extern int errno;
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 BSD4_1
117 #ifdef BSD /* this is done this way to avoid defined (BSD) || defined (USG)
118 because the vms compiler doesn't grok `defined' */
119 #include <fcntl.h>
120 #endif
121 #ifdef USG
122 #ifndef USG5
123 #include <fcntl.h>
124 #endif
125 #endif
126 #endif /* not 4.1 bsd */
127
128 #ifndef MSDOS
129 #include <sys/ioctl.h>
130 #endif
131 #include "systty.h"
132 #include "syswait.h"
133
134 #ifdef BROKEN_TIOCGWINSZ
135 #undef TIOCGWINSZ
136 #undef TIOCSWINSZ
137 #endif
138
139 #ifdef USG
140 #include <sys/utsname.h>
141 #include <string.h>
142 #ifndef MEMORY_IN_STRING_H
143 #include <memory.h>
144 #endif
145 #if defined (TIOCGWINSZ) || defined (ISC4_0)
146 #ifdef NEED_SIOCTL
147 #include <sys/sioctl.h>
148 #endif
149 #ifdef NEED_PTEM_H
150 #include <sys/stream.h>
151 #include <sys/ptem.h>
152 #endif
153 #endif /* TIOCGWINSZ or ISC4_0 */
154 #endif /* USG */
155
156 extern int quit_char;
157
158 #include "frame.h"
159 #include "window.h"
160 #include "termhooks.h"
161 #include "termchar.h"
162 #include "termopts.h"
163 #include "dispextern.h"
164 #include "process.h"
165
166 #ifdef WINDOWSNT
167 #include <direct.h>
168 /* In process.h which conflicts with the local copy. */
169 #define _P_WAIT 0
170 int _CRTAPI1 _spawnlp (int, const char *, const char *, ...);
171 int _CRTAPI1 _getpid (void);
172 #endif
173
174 #ifdef NONSYSTEM_DIR_LIBRARY
175 #include "ndir.h"
176 #endif /* NONSYSTEM_DIR_LIBRARY */
177
178 #include "syssignal.h"
179 #include "systime.h"
180 #ifdef HAVE_UTIME_H
181 #include <utime.h>
182 #endif
183
184 #ifndef HAVE_UTIMES
185 #ifndef HAVE_STRUCT_UTIMBUF
186 /* We want to use utime rather than utimes, but we couldn't find the
187 structure declaration. We'll use the traditional one. */
188 struct utimbuf {
189 long actime;
190 long modtime;
191 };
192 #endif
193 #endif
194
195 #ifndef VFORK_RETURN_TYPE
196 #define VFORK_RETURN_TYPE int
197 #endif
198
199 /* LPASS8 is new in 4.3, and makes cbreak mode provide all 8 bits. */
200 #ifndef LPASS8
201 #define LPASS8 0
202 #endif
203
204 #ifdef BSD4_1
205 #define LNOFLSH 0100000
206 #endif
207
208 static int baud_convert[] =
209 #ifdef BAUD_CONVERT
210 BAUD_CONVERT;
211 #else
212 {
213 0, 50, 75, 110, 135, 150, 200, 300, 600, 1200,
214 1800, 2400, 4800, 9600, 19200, 38400
215 };
216 #endif
217
218 extern short ospeed;
219
220 /* The file descriptor for Emacs's input terminal.
221 Under Unix, this is normally zero except when using X;
222 under VMS, we place the input channel number here. */
223 int input_fd;
224 \f
225 /* Specify a different file descriptor for further input operations. */
226
227 void
228 change_input_fd (fd)
229 int fd;
230 {
231 input_fd = fd;
232 }
233
234 /* Discard pending input on descriptor input_fd. */
235
236 discard_tty_input ()
237 {
238 #ifndef WINDOWSNT
239 struct emacs_tty buf;
240
241 if (noninteractive)
242 return;
243
244 /* Discarding input is not safe when the input could contain
245 replies from the X server. So don't do it. */
246 if (read_socket_hook)
247 return;
248
249 #ifdef VMS
250 end_kbd_input ();
251 SYS$QIOW (0, input_fd, IO$_READVBLK|IO$M_PURGE, input_iosb, 0, 0,
252 &buf.main, 0, 0, terminator_mask, 0, 0);
253 queue_kbd_input ();
254 #else /* not VMS */
255 #ifdef APOLLO
256 {
257 int zero = 0;
258 ioctl (input_fd, TIOCFLUSH, &zero);
259 }
260 #else /* not Apollo */
261 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
262 while (dos_keyread () != -1)
263 ;
264 #else /* not MSDOS */
265 EMACS_GET_TTY (input_fd, &buf);
266 EMACS_SET_TTY (input_fd, &buf, 0);
267 #endif /* not MSDOS */
268 #endif /* not Apollo */
269 #endif /* not VMS */
270 #endif /* not WINDOWSNT */
271 }
272
273 #ifdef SIGTSTP
274
275 /* Arrange for character C to be read as the next input from
276 the terminal. */
277
278 stuff_char (c)
279 char c;
280 {
281 if (read_socket_hook)
282 return;
283
284 /* Should perhaps error if in batch mode */
285 #ifdef TIOCSTI
286 ioctl (input_fd, TIOCSTI, &c);
287 #else /* no TIOCSTI */
288 error ("Cannot stuff terminal input characters in this version of Unix");
289 #endif /* no TIOCSTI */
290 }
291
292 #endif /* SIGTSTP */
293 \f
294 init_baud_rate ()
295 {
296 if (noninteractive)
297 ospeed = 0;
298 else
299 {
300 #ifdef DOS_NT
301 ospeed = 15;
302 #else /* not DOS_NT */
303 #ifdef VMS
304 struct sensemode sg;
305
306 SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
307 &sg.class, 12, 0, 0, 0, 0 );
308 ospeed = sg.xmit_baud;
309 #else /* not VMS */
310 #ifdef HAVE_TERMIOS
311 struct termios sg;
312
313 sg.c_cflag = B9600;
314 tcgetattr (input_fd, &sg);
315 ospeed = cfgetospeed (&sg);
316 #if defined (USE_GETOBAUD) && defined (getobaud)
317 /* m88k-motorola-sysv3 needs this (ghazi@noc.rutgers.edu) 9/1/94. */
318 if (ospeed == 0)
319 ospeed = getobaud (sg.c_cflag);
320 #endif
321 #else /* neither VMS nor TERMIOS */
322 #ifdef HAVE_TERMIO
323 struct termio sg;
324
325 sg.c_cflag = B9600;
326 #ifdef HAVE_TCATTR
327 tcgetattr (input_fd, &sg);
328 #else
329 ioctl (input_fd, TCGETA, &sg);
330 #endif
331 ospeed = sg.c_cflag & CBAUD;
332 #else /* neither VMS nor TERMIOS nor TERMIO */
333 struct sgttyb sg;
334
335 sg.sg_ospeed = B9600;
336 if (ioctl (input_fd, TIOCGETP, &sg) < 0)
337 abort ();
338 ospeed = sg.sg_ospeed;
339 #endif /* not HAVE_TERMIO */
340 #endif /* not HAVE_TERMIOS */
341 #endif /* not VMS */
342 #endif /* not DOS_NT */
343 }
344
345 baud_rate = (ospeed < sizeof baud_convert / sizeof baud_convert[0]
346 ? baud_convert[ospeed] : 9600);
347 if (baud_rate == 0)
348 baud_rate = 1200;
349 }
350
351 /*ARGSUSED*/
352 set_exclusive_use (fd)
353 int fd;
354 {
355 #ifdef FIOCLEX
356 ioctl (fd, FIOCLEX, 0);
357 #endif
358 /* Ok to do nothing if this feature does not exist */
359 }
360 \f
361 #ifndef subprocesses
362
363 wait_without_blocking ()
364 {
365 #ifdef BSD
366 wait3 (0, WNOHANG | WUNTRACED, 0);
367 #else
368 croak ("wait_without_blocking");
369 #endif
370 synch_process_alive = 0;
371 }
372
373 #endif /* not subprocesses */
374
375 int wait_debugging; /* Set nonzero to make following function work under dbx
376 (at least for bsd). */
377
378 SIGTYPE
379 wait_for_termination_signal ()
380 {}
381
382 /* Wait for subprocess with process id `pid' to terminate and
383 make sure it will get eliminated (not remain forever as a zombie) */
384
385 wait_for_termination (pid)
386 int pid;
387 {
388 while (1)
389 {
390 #ifdef subprocesses
391 #ifdef VMS
392 int status;
393
394 status = SYS$FORCEX (&pid, 0, 0);
395 break;
396 #else /* not VMS */
397 #if defined (BSD) || (defined (HPUX) && !defined (HPUX_5))
398 /* Note that kill returns -1 even if the process is just a zombie now.
399 But inevitably a SIGCHLD interrupt should be generated
400 and child_sig will do wait3 and make the process go away. */
401 /* There is some indication that there is a bug involved with
402 termination of subprocesses, perhaps involving a kernel bug too,
403 but no idea what it is. Just as a hunch we signal SIGCHLD to see
404 if that causes the problem to go away or get worse. */
405 sigsetmask (sigmask (SIGCHLD));
406 if (0 > kill (pid, 0))
407 {
408 sigsetmask (SIGEMPTYMASK);
409 kill (getpid (), SIGCHLD);
410 break;
411 }
412 if (wait_debugging)
413 sleep (1);
414 else
415 sigpause (SIGEMPTYMASK);
416 #else /* not BSD, and not HPUX version >= 6 */
417 #if defined (UNIPLUS)
418 if (0 > kill (pid, 0))
419 break;
420 wait (0);
421 #else /* neither BSD nor UNIPLUS: random sysV */
422 #ifdef POSIX_SIGNALS /* would this work for LINUX as well? */
423 sigblock (sigmask (SIGCHLD));
424 if (0 > kill (pid, 0))
425 {
426 sigunblock (sigmask (SIGCHLD));
427 break;
428 }
429 sigpause (SIGEMPTYMASK);
430 #else /* not POSIX_SIGNALS */
431 #ifdef HAVE_SYSV_SIGPAUSE
432 sighold (SIGCHLD);
433 if (0 > kill (pid, 0))
434 {
435 sigrelse (SIGCHLD);
436 break;
437 }
438 sigpause (SIGCHLD);
439 #else /* not HAVE_SYSV_SIGPAUSE */
440 #ifdef WINDOWSNT
441 wait (0);
442 break;
443 #else /* not WINDOWSNT */
444 if (0 > kill (pid, 0))
445 break;
446 /* Using sleep instead of pause avoids timing error.
447 If the inferior dies just before the sleep,
448 we lose just one second. */
449 sleep (1);
450 #endif /* not WINDOWSNT */
451 #endif /* not HAVE_SYSV_SIGPAUSE */
452 #endif /* not POSIX_SIGNALS */
453 #endif /* not UNIPLUS */
454 #endif /* not BSD, and not HPUX version >= 6 */
455 #endif /* not VMS */
456 #else /* not subprocesses */
457 #ifndef BSD4_1
458 if (kill (pid, 0) < 0)
459 break;
460 wait (0);
461 #else /* BSD4_1 */
462 int status;
463 status = wait (0);
464 if (status == pid || status == -1)
465 break;
466 #endif /* BSD4_1 */
467 #endif /* not subprocesses */
468 }
469 }
470
471 #ifdef subprocesses
472
473 /*
474 * flush any pending output
475 * (may flush input as well; it does not matter the way we use it)
476 */
477
478 flush_pending_output (channel)
479 int channel;
480 {
481 #ifdef HAVE_TERMIOS
482 /* If we try this, we get hit with SIGTTIN, because
483 the child's tty belongs to the child's pgrp. */
484 #else
485 #ifdef TCFLSH
486 ioctl (channel, TCFLSH, 1);
487 #else
488 #ifdef TIOCFLUSH
489 int zero = 0;
490 /* 3rd arg should be ignored
491 but some 4.2 kernels actually want the address of an int
492 and nonzero means something different. */
493 ioctl (channel, TIOCFLUSH, &zero);
494 #endif
495 #endif
496 #endif
497 }
498 \f
499 #ifndef VMS
500 /* Set up the terminal at the other end of a pseudo-terminal that
501 we will be controlling an inferior through.
502 It should not echo or do line-editing, since that is done
503 in Emacs. No padding needed for insertion into an Emacs buffer. */
504
505 child_setup_tty (out)
506 int out;
507 {
508 #ifndef DOS_NT
509 struct emacs_tty s;
510
511 EMACS_GET_TTY (out, &s);
512
513 #if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
514 s.main.c_oflag |= OPOST; /* Enable output postprocessing */
515 s.main.c_oflag &= ~ONLCR; /* Disable map of NL to CR-NL on output */
516 #ifdef NLDLY
517 s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
518 /* No output delays */
519 #endif
520 s.main.c_lflag &= ~ECHO; /* Disable echo */
521 s.main.c_lflag |= ISIG; /* Enable signals */
522 #ifdef IUCLC
523 s.main.c_iflag &= ~IUCLC; /* Disable downcasing on input. */
524 #endif
525 #ifdef ISTRIP
526 s.main.c_iflag &= ~ISTRIP; /* don't strip 8th bit on input */
527 #endif
528 #ifdef OLCUC
529 s.main.c_oflag &= ~OLCUC; /* Disable upcasing on output. */
530 #endif
531 s.main.c_oflag &= ~TAB3; /* Disable tab expansion */
532 s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
533 #if 0
534 /* Said to be unnecessary: */
535 s.main.c_cc[VMIN] = 1; /* minimum number of characters to accept */
536 s.main.c_cc[VTIME] = 0; /* wait forever for at least 1 character */
537 #endif
538
539 s.main.c_lflag |= ICANON; /* Enable erase/kill and eof processing */
540 s.main.c_cc[VEOF] = 04; /* insure that EOF is Control-D */
541 s.main.c_cc[VERASE] = CDISABLE; /* disable erase processing */
542 s.main.c_cc[VKILL] = CDISABLE; /* disable kill processing */
543
544 #ifdef HPUX
545 s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
546 #endif /* HPUX */
547
548 #ifdef AIX
549 /* AIX enhanced edit loses NULs, so disable it */
550 #ifndef IBMR2AIX
551 s.main.c_line = 0;
552 s.main.c_iflag &= ~ASCEDIT;
553 #endif
554 /* Also, PTY overloads NUL and BREAK.
555 don't ignore break, but don't signal either, so it looks like NUL. */
556 s.main.c_iflag &= ~IGNBRK;
557 s.main.c_iflag &= ~BRKINT;
558 /* QUIT and INTR work better as signals, so disable character forms */
559 s.main.c_cc[VINTR] = 0377;
560 #ifdef SIGNALS_VIA_CHARACTERS
561 /* the QUIT and INTR character are used in process_send_signal
562 so set them here to something useful. */
563 if (s.main.c_cc[VQUIT] == 0377)
564 s.main.c_cc[VQUIT] = '\\'&037; /* Control-\ */
565 if (s.main.c_cc[VINTR] == 0377)
566 s.main.c_cc[VINTR] = 'C'&037; /* Control-C */
567 #else /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
568 /* QUIT and INTR work better as signals, so disable character forms */
569 s.main.c_cc[VQUIT] = 0377;
570 s.main.c_cc[VINTR] = 0377;
571 s.main.c_lflag &= ~ISIG;
572 #endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
573 s.main.c_cc[VEOL] = 0377;
574 s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
575 #endif /* AIX */
576
577 #else /* not HAVE_TERMIO */
578
579 s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
580 | CBREAK | TANDEM);
581 s.main.sg_flags |= LPASS8;
582 s.main.sg_erase = 0377;
583 s.main.sg_kill = 0377;
584 s.lmode = LLITOUT | s.lmode; /* Don't strip 8th bit */
585
586 #endif /* not HAVE_TERMIO */
587
588 EMACS_SET_TTY (out, &s, 0);
589
590 #ifdef BSD4_1
591 if (interrupt_input)
592 reset_sigio ();
593 #endif /* BSD4_1 */
594 #ifdef RTU
595 {
596 int zero = 0;
597 ioctl (out, FIOASYNC, &zero);
598 }
599 #endif /* RTU */
600 #endif /* not DOS_NT */
601 }
602 #endif /* not VMS */
603
604 #endif /* subprocesses */
605 \f
606 /* Record a signal code and the handler for it. */
607 struct save_signal
608 {
609 int code;
610 SIGTYPE (*handler) ();
611 };
612
613 /* Suspend the Emacs process; give terminal to its superior. */
614
615 sys_suspend ()
616 {
617 #ifdef VMS
618 /* "Foster" parentage allows emacs to return to a subprocess that attached
619 to the current emacs as a cheaper than starting a whole new process. This
620 is set up by KEPTEDITOR.COM. */
621 unsigned long parent_id, foster_parent_id;
622 char *fpid_string;
623
624 fpid_string = getenv ("EMACS_PARENT_PID");
625 if (fpid_string != NULL)
626 {
627 sscanf (fpid_string, "%x", &foster_parent_id);
628 if (foster_parent_id != 0)
629 parent_id = foster_parent_id;
630 else
631 parent_id = getppid ();
632 }
633 else
634 parent_id = getppid ();
635
636 xfree (fpid_string); /* On VMS, this was malloc'd */
637
638 if (parent_id && parent_id != 0xffffffff)
639 {
640 SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
641 int status = LIB$ATTACH (&parent_id) & 1;
642 signal (SIGINT, oldsig);
643 return status;
644 }
645 else
646 {
647 struct {
648 int l;
649 char *a;
650 } d_prompt;
651 d_prompt.l = sizeof ("Emacs: "); /* Our special prompt */
652 d_prompt.a = "Emacs: "; /* Just a reminder */
653 LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
654 return 1;
655 }
656 return -1;
657 #else
658 #if defined(SIGTSTP) && !defined(MSDOS)
659
660 {
661 int pgrp = EMACS_GETPGRP (0);
662 EMACS_KILLPG (pgrp, SIGTSTP);
663 }
664
665 #else /* No SIGTSTP */
666 #ifdef USG_JOBCTRL /* If you don't know what this is don't mess with it */
667 ptrace (0, 0, 0, 0); /* set for ptrace - caught by csh */
668 kill (getpid (), SIGQUIT);
669
670 #else /* No SIGTSTP or USG_JOBCTRL */
671
672 /* On a system where suspending is not implemented,
673 instead fork a subshell and let it talk directly to the terminal
674 while we wait. */
675 sys_subshell ();
676
677 #endif /* no USG_JOBCTRL */
678 #endif /* no SIGTSTP */
679 #endif /* not VMS */
680 }
681
682 /* Fork a subshell. */
683
684 sys_subshell ()
685 {
686 #ifndef VMS
687 #ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida */
688 int st;
689 char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS. */
690 #endif
691 int pid;
692 struct save_signal saved_handlers[5];
693 Lisp_Object dir;
694 unsigned char *str = 0;
695 int len;
696
697 saved_handlers[0].code = SIGINT;
698 saved_handlers[1].code = SIGQUIT;
699 saved_handlers[2].code = SIGTERM;
700 #ifdef SIGIO
701 saved_handlers[3].code = SIGIO;
702 saved_handlers[4].code = 0;
703 #else
704 saved_handlers[3].code = 0;
705 #endif
706
707 /* Mentioning current_buffer->buffer would mean including buffer.h,
708 which somehow wedges the hp compiler. So instead... */
709
710 dir = intern ("default-directory");
711 if (NILP (Fboundp (dir)))
712 goto xyzzy;
713 dir = Fsymbol_value (dir);
714 if (!STRINGP (dir))
715 goto xyzzy;
716
717 dir = expand_and_dir_to_file (Funhandled_file_name_directory (dir), Qnil);
718 str = (unsigned char *) alloca (XSTRING (dir)->size + 2);
719 len = XSTRING (dir)->size;
720 bcopy (XSTRING (dir)->data, str, len);
721 if (str[len - 1] != '/') str[len++] = '/';
722 str[len] = 0;
723 xyzzy:
724
725 #ifdef WINDOWSNT
726 pid = -1;
727 #else /* not WINDOWSNT */
728 #ifdef MSDOS
729 pid = 0;
730 #else
731 pid = vfork ();
732 if (pid == -1)
733 error ("Can't spawn subshell");
734 #endif
735
736 if (pid == 0)
737 #endif /* not WINDOWSNT */
738 {
739 char *sh = 0;
740
741 #ifdef MSDOS /* MW, Aug 1993 */
742 getwd (oldwd);
743 if (sh == 0)
744 sh = (char *) egetenv ("SUSPEND"); /* KFS, 1994-12-14 */
745 #endif
746 if (sh == 0)
747 sh = (char *) egetenv ("SHELL");
748 if (sh == 0)
749 sh = "sh";
750
751 /* Use our buffer's default directory for the subshell. */
752 if (str)
753 chdir (str);
754
755 #ifdef subprocesses
756 close_process_descs (); /* Close Emacs's pipes/ptys */
757 #endif
758
759 #ifdef SET_EMACS_PRIORITY
760 {
761 extern int emacs_priority;
762
763 if (emacs_priority < 0)
764 nice (-emacs_priority);
765 }
766 #endif
767
768 #ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida */
769 st = system (sh);
770 chdir (oldwd);
771 #if 0 /* This is also reported if last command executed in subshell failed, KFS */
772 if (st)
773 report_file_error ("Can't execute subshell", Fcons (build_string (sh), Qnil));
774 #endif
775 #else /* not MSDOS */
776 #ifdef WINDOWSNT
777 /* Waits for process completion */
778 pid = _spawnlp (_P_WAIT, sh, sh, NULL);
779 if (pid == -1)
780 write (1, "Can't execute subshell", 22);
781
782 take_console ();
783 #else /* not WINDOWSNT */
784 execlp (sh, sh, 0);
785 write (1, "Can't execute subshell", 22);
786 _exit (1);
787 #endif /* not WINDOWSNT */
788 #endif /* not MSDOS */
789 }
790
791 save_signal_handlers (saved_handlers);
792 synch_process_alive = 1;
793 #ifndef MSDOS
794 wait_for_termination (pid);
795 #endif
796 restore_signal_handlers (saved_handlers);
797 #endif /* !VMS */
798 }
799
800 save_signal_handlers (saved_handlers)
801 struct save_signal *saved_handlers;
802 {
803 while (saved_handlers->code)
804 {
805 saved_handlers->handler
806 = (SIGTYPE (*) ()) signal (saved_handlers->code, SIG_IGN);
807 saved_handlers++;
808 }
809 }
810
811 restore_signal_handlers (saved_handlers)
812 struct save_signal *saved_handlers;
813 {
814 while (saved_handlers->code)
815 {
816 signal (saved_handlers->code, saved_handlers->handler);
817 saved_handlers++;
818 }
819 }
820 \f
821 #ifdef F_SETFL
822
823 int old_fcntl_flags;
824
825 init_sigio (fd)
826 int fd;
827 {
828 #ifdef FASYNC
829 old_fcntl_flags = fcntl (fd, F_GETFL, 0) & ~FASYNC;
830 fcntl (fd, F_SETFL, old_fcntl_flags | FASYNC);
831 #endif
832 interrupts_deferred = 0;
833 }
834
835 reset_sigio ()
836 {
837 unrequest_sigio ();
838 }
839
840 #ifdef FASYNC /* F_SETFL does not imply existence of FASYNC */
841
842 request_sigio ()
843 {
844 if (read_socket_hook)
845 return;
846
847 #ifdef SIGWINCH
848 sigunblock (sigmask (SIGWINCH));
849 #endif
850 fcntl (input_fd, F_SETFL, old_fcntl_flags | FASYNC);
851
852 interrupts_deferred = 0;
853 }
854
855 unrequest_sigio ()
856 {
857 if (read_socket_hook)
858 return;
859
860 #ifdef SIGWINCH
861 sigblock (sigmask (SIGWINCH));
862 #endif
863 fcntl (input_fd, F_SETFL, old_fcntl_flags);
864 interrupts_deferred = 1;
865 }
866
867 #else /* no FASYNC */
868 #ifdef STRIDE /* Stride doesn't have FASYNC - use FIOASYNC */
869
870 request_sigio ()
871 {
872 int on = 1;
873
874 if (read_socket_hook)
875 return;
876
877 ioctl (input_fd, FIOASYNC, &on);
878 interrupts_deferred = 0;
879 }
880
881 unrequest_sigio ()
882 {
883 int off = 0;
884
885 if (read_socket_hook)
886 return;
887
888 ioctl (input_fd, FIOASYNC, &off);
889 interrupts_deferred = 1;
890 }
891
892 #else /* not FASYNC, not STRIDE */
893
894 #ifdef _CX_UX
895
896 #include <termios.h>
897
898 request_sigio ()
899 {
900 int on = 1;
901 sigset_t st;
902
903 if (read_socket_hook)
904 return;
905
906 sigemptyset(&st);
907 sigaddset(&st, SIGIO);
908 ioctl (input_fd, FIOASYNC, &on);
909 interrupts_deferred = 0;
910 sigprocmask(SIG_UNBLOCK, &st, (sigset_t *)0);
911 }
912
913 unrequest_sigio ()
914 {
915 int off = 0;
916
917 if (read_socket_hook)
918 return;
919
920 ioctl (input_fd, FIOASYNC, &off);
921 interrupts_deferred = 1;
922 }
923
924 #else /* ! _CX_UX */
925
926 request_sigio ()
927 {
928 if (read_socket_hook)
929 return;
930
931 croak ("request_sigio");
932 }
933
934 unrequest_sigio ()
935 {
936 if (read_socket_hook)
937 return;
938
939 croak ("unrequest_sigio");
940 }
941
942 #endif /* _CX_UX */
943 #endif /* STRIDE */
944 #endif /* FASYNC */
945 #endif /* F_SETFL */
946 \f
947 /* Saving and restoring the process group of Emacs's terminal. */
948
949 #ifdef BSD_PGRPS
950
951 /* The process group of which Emacs was a member when it initially
952 started.
953
954 If Emacs was in its own process group (i.e. inherited_pgroup ==
955 getpid ()), then we know we're running under a shell with job
956 control (Emacs would never be run as part of a pipeline).
957 Everything is fine.
958
959 If Emacs was not in its own process group, then we know we're
960 running under a shell (or a caller) that doesn't know how to
961 separate itself from Emacs (like sh). Emacs must be in its own
962 process group in order to receive SIGIO correctly. In this
963 situation, we put ourselves in our own pgroup, forcibly set the
964 tty's pgroup to our pgroup, and make sure to restore and reinstate
965 the tty's pgroup just like any other terminal setting. If
966 inherited_group was not the tty's pgroup, then we'll get a
967 SIGTTmumble when we try to change the tty's pgroup, and a CONT if
968 it goes foreground in the future, which is what should happen. */
969 int inherited_pgroup;
970
971 /* Split off the foreground process group to Emacs alone.
972 When we are in the foreground, but not started in our own process
973 group, redirect the TTY to point to our own process group. We need
974 to be in our own process group to receive SIGIO properly. */
975 narrow_foreground_group ()
976 {
977 int me = getpid ();
978
979 setpgrp (0, inherited_pgroup);
980 if (inherited_pgroup != me)
981 EMACS_SET_TTY_PGRP (input_fd, &me);
982 setpgrp (0, me);
983 }
984
985 /* Set the tty to our original foreground group. */
986 widen_foreground_group ()
987 {
988 if (inherited_pgroup != getpid ())
989 EMACS_SET_TTY_PGRP (input_fd, &inherited_pgroup);
990 setpgrp (0, inherited_pgroup);
991 }
992
993 #endif /* BSD_PGRPS */
994 \f
995 /* Getting and setting emacs_tty structures. */
996
997 /* Set *TC to the parameters associated with the terminal FD.
998 Return zero if all's well, or -1 if we ran into an error we
999 couldn't deal with. */
1000 int
1001 emacs_get_tty (fd, settings)
1002 int fd;
1003 struct emacs_tty *settings;
1004 {
1005 /* Retrieve the primary parameters - baud rate, character size, etcetera. */
1006 #ifdef HAVE_TCATTR
1007 /* We have those nifty POSIX tcmumbleattr functions. */
1008 if (tcgetattr (fd, &settings->main) < 0)
1009 return -1;
1010
1011 #else
1012 #ifdef HAVE_TERMIO
1013 /* The SYSV-style interface? */
1014 if (ioctl (fd, TCGETA, &settings->main) < 0)
1015 return -1;
1016
1017 #else
1018 #ifdef VMS
1019 /* Vehemently Monstrous System? :-) */
1020 if (! (SYS$QIOW (0, fd, IO$_SENSEMODE, settings, 0, 0,
1021 &settings->main.class, 12, 0, 0, 0, 0)
1022 & 1))
1023 return -1;
1024
1025 #else
1026 #ifndef DOS_NT
1027 /* I give up - I hope you have the BSD ioctls. */
1028 if (ioctl (fd, TIOCGETP, &settings->main) < 0)
1029 return -1;
1030 #endif /* not DOS_NT */
1031 #endif
1032 #endif
1033 #endif
1034
1035 /* Suivant - Do we have to get struct ltchars data? */
1036 #ifdef HAVE_LTCHARS
1037 if (ioctl (fd, TIOCGLTC, &settings->ltchars) < 0)
1038 return -1;
1039 #endif
1040
1041 /* How about a struct tchars and a wordful of lmode bits? */
1042 #ifdef HAVE_TCHARS
1043 if (ioctl (fd, TIOCGETC, &settings->tchars) < 0
1044 || ioctl (fd, TIOCLGET, &settings->lmode) < 0)
1045 return -1;
1046 #endif
1047
1048 /* We have survived the tempest. */
1049 return 0;
1050 }
1051
1052
1053 /* Set the parameters of the tty on FD according to the contents of
1054 *SETTINGS. If FLUSHP is non-zero, we discard input.
1055 Return 0 if all went well, and -1 if anything failed. */
1056
1057 int
1058 emacs_set_tty (fd, settings, flushp)
1059 int fd;
1060 struct emacs_tty *settings;
1061 int flushp;
1062 {
1063 /* Set the primary parameters - baud rate, character size, etcetera. */
1064 #ifdef HAVE_TCATTR
1065 int i;
1066 /* We have those nifty POSIX tcmumbleattr functions.
1067 William J. Smith <wjs@wiis.wang.com> writes:
1068 "POSIX 1003.1 defines tcsetattr() to return success if it was
1069 able to perform any of the requested actions, even if some
1070 of the requested actions could not be performed.
1071 We must read settings back to ensure tty setup properly.
1072 AIX requires this to keep tty from hanging occasionally." */
1073 /* This make sure that we don't loop indefinitely in here. */
1074 for (i = 0 ; i < 10 ; i++)
1075 if (tcsetattr (fd, flushp ? TCSAFLUSH : TCSADRAIN, &settings->main) < 0)
1076 {
1077 if (errno == EINTR)
1078 continue;
1079 else
1080 return -1;
1081 }
1082 else
1083 {
1084 struct termios new;
1085
1086 /* Get the current settings, and see if they're what we asked for. */
1087 tcgetattr (fd, &new);
1088 /* We cannot use memcmp on the whole structure here because under
1089 * aix386 the termios structure has some reserved field that may
1090 * not be filled in.
1091 */
1092 if ( new.c_iflag == settings->main.c_iflag
1093 && new.c_oflag == settings->main.c_oflag
1094 && new.c_cflag == settings->main.c_cflag
1095 && new.c_lflag == settings->main.c_lflag
1096 && memcmp(new.c_cc, settings->main.c_cc, NCCS) == 0)
1097 break;
1098 else
1099 continue;
1100 }
1101
1102 #else
1103 #ifdef HAVE_TERMIO
1104 /* The SYSV-style interface? */
1105 if (ioctl (fd, flushp ? TCSETAF : TCSETAW, &settings->main) < 0)
1106 return -1;
1107
1108 #else
1109 #ifdef VMS
1110 /* Vehemently Monstrous System? :-) */
1111 if (! (SYS$QIOW (0, fd, IO$_SETMODE, &input_iosb, 0, 0,
1112 &settings->main.class, 12, 0, 0, 0, 0)
1113 & 1))
1114 return -1;
1115
1116 #else
1117 #ifndef DOS_NT
1118 /* I give up - I hope you have the BSD ioctls. */
1119 if (ioctl (fd, (flushp) ? TIOCSETP : TIOCSETN, &settings->main) < 0)
1120 return -1;
1121 #endif /* not DOS_NT */
1122
1123 #endif
1124 #endif
1125 #endif
1126
1127 /* Suivant - Do we have to get struct ltchars data? */
1128 #ifdef HAVE_LTCHARS
1129 if (ioctl (fd, TIOCSLTC, &settings->ltchars) < 0)
1130 return -1;
1131 #endif
1132
1133 /* How about a struct tchars and a wordful of lmode bits? */
1134 #ifdef HAVE_TCHARS
1135 if (ioctl (fd, TIOCSETC, &settings->tchars) < 0
1136 || ioctl (fd, TIOCLSET, &settings->lmode) < 0)
1137 return -1;
1138 #endif
1139
1140 /* We have survived the tempest. */
1141 return 0;
1142 }
1143
1144 \f
1145 /* The initial tty mode bits */
1146 struct emacs_tty old_tty;
1147
1148 /* 1 if we have been through init_sys_modes. */
1149 int term_initted;
1150
1151 /* 1 if outer tty status has been recorded. */
1152 int old_tty_valid;
1153
1154 #ifdef BSD4_1
1155 /* BSD 4.1 needs to keep track of the lmode bits in order to start
1156 sigio. */
1157 int lmode;
1158 #endif
1159
1160 #ifndef F_SETOWN_BUG
1161 #ifdef F_SETOWN
1162 int old_fcntl_owner;
1163 #endif /* F_SETOWN */
1164 #endif /* F_SETOWN_BUG */
1165
1166 /* This may also be defined in stdio,
1167 but if so, this does no harm,
1168 and using the same name avoids wasting the other one's space. */
1169
1170 #if defined (USG) || defined (DGUX)
1171 unsigned char _sobuf[BUFSIZ+8];
1172 #else
1173 char _sobuf[BUFSIZ];
1174 #endif
1175
1176 #ifdef HAVE_LTCHARS
1177 static struct ltchars new_ltchars = {-1,-1,-1,-1,-1,-1};
1178 #endif
1179 #ifdef HAVE_TCHARS
1180 static struct tchars new_tchars = {-1,-1,-1,-1,-1,-1};
1181 #endif
1182
1183 init_sys_modes ()
1184 {
1185 struct emacs_tty tty;
1186
1187 #ifdef VMS
1188 #if 0
1189 static int oob_chars[2] = {0, 1 << 7}; /* catch C-g's */
1190 extern int (*interrupt_signal) ();
1191 #endif
1192 #endif
1193
1194 if (noninteractive)
1195 return;
1196
1197 #ifdef VMS
1198 if (!input_ef)
1199 input_ef = get_kbd_event_flag ();
1200 /* LIB$GET_EF (&input_ef); */
1201 SYS$CLREF (input_ef);
1202 waiting_for_ast = 0;
1203 if (!timer_ef)
1204 timer_ef = get_timer_event_flag ();
1205 /* LIB$GET_EF (&timer_ef); */
1206 SYS$CLREF (timer_ef);
1207 #if 0
1208 if (!process_ef)
1209 {
1210 LIB$GET_EF (&process_ef);
1211 SYS$CLREF (process_ef);
1212 }
1213 if (input_ef / 32 != process_ef / 32)
1214 croak ("Input and process event flags in different clusters.");
1215 #endif
1216 if (input_ef / 32 != timer_ef / 32)
1217 croak ("Input and timer event flags in different clusters.");
1218 #if 0
1219 input_eflist = ((unsigned) 1 << (input_ef % 32)) |
1220 ((unsigned) 1 << (process_ef % 32));
1221 #endif
1222 timer_eflist = ((unsigned) 1 << (input_ef % 32)) |
1223 ((unsigned) 1 << (timer_ef % 32));
1224 #ifndef VMS4_4
1225 sys_access_reinit ();
1226 #endif
1227 #endif /* not VMS */
1228
1229 #ifdef BSD_PGRPS
1230 if (! read_socket_hook && EQ (Vwindow_system, Qnil))
1231 narrow_foreground_group ();
1232 #endif
1233
1234 #ifdef HAVE_WINDOW_SYSTEM
1235 /* Emacs' window system on MSDOG uses the `internal terminal' and therefore
1236 needs the initialization code below. */
1237 if (!read_socket_hook && EQ (Vwindow_system, Qnil))
1238 #endif
1239 {
1240 EMACS_GET_TTY (input_fd, &old_tty);
1241
1242 old_tty_valid = 1;
1243
1244 tty = old_tty;
1245
1246 #if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
1247 #ifdef DGUX
1248 /* This allows meta to be sent on 8th bit. */
1249 tty.main.c_iflag &= ~INPCK; /* don't check input for parity */
1250 #endif
1251 tty.main.c_iflag |= (IGNBRK); /* Ignore break condition */
1252 tty.main.c_iflag &= ~ICRNL; /* Disable map of CR to NL on input */
1253 #ifdef ISTRIP
1254 tty.main.c_iflag &= ~ISTRIP; /* don't strip 8th bit on input */
1255 #endif
1256 tty.main.c_lflag &= ~ECHO; /* Disable echo */
1257 tty.main.c_lflag &= ~ICANON; /* Disable erase/kill processing */
1258 #ifdef IEXTEN
1259 tty.main.c_lflag &= ~IEXTEN; /* Disable other editing characters. */
1260 #endif
1261 tty.main.c_lflag |= ISIG; /* Enable signals */
1262 if (flow_control)
1263 {
1264 tty.main.c_iflag |= IXON; /* Enable start/stop output control */
1265 #ifdef IXANY
1266 tty.main.c_iflag &= ~IXANY;
1267 #endif /* IXANY */
1268 }
1269 else
1270 tty.main.c_iflag &= ~IXON; /* Disable start/stop output control */
1271 tty.main.c_oflag &= ~ONLCR; /* Disable map of NL to CR-NL
1272 on output */
1273 tty.main.c_oflag &= ~TAB3; /* Disable tab expansion */
1274 #ifdef CS8
1275 if (meta_key)
1276 {
1277 tty.main.c_cflag |= CS8; /* allow 8th bit on input */
1278 tty.main.c_cflag &= ~PARENB;/* Don't check parity */
1279 }
1280 #endif
1281 tty.main.c_cc[VINTR] = quit_char; /* C-g (usually) gives SIGINT */
1282 /* Set up C-g for both SIGQUIT and SIGINT.
1283 We don't know which we will get, but we handle both alike
1284 so which one it really gives us does not matter. */
1285 tty.main.c_cc[VQUIT] = quit_char;
1286 tty.main.c_cc[VMIN] = 1; /* Input should wait for at least 1 char */
1287 tty.main.c_cc[VTIME] = 0; /* no matter how long that takes. */
1288 #ifdef VSWTCH
1289 tty.main.c_cc[VSWTCH] = CDISABLE; /* Turn off shell layering use
1290 of C-z */
1291 #endif /* VSWTCH */
1292 #if defined (mips) || defined (HAVE_TCATTR)
1293 #ifdef VSUSP
1294 tty.main.c_cc[VSUSP] = CDISABLE; /* Turn off mips handling of C-z. */
1295 #endif /* VSUSP */
1296 #ifdef V_DSUSP
1297 tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off mips handling of C-y. */
1298 #endif /* V_DSUSP */
1299 #ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP. */
1300 tty.main.c_cc[VDSUSP] = CDISABLE;
1301 #endif /* VDSUSP */
1302 #ifdef VLNEXT
1303 tty.main.c_cc[VLNEXT] = CDISABLE;
1304 #endif /* VLNEXT */
1305 #ifdef VREPRINT
1306 tty.main.c_cc[VREPRINT] = CDISABLE;
1307 #endif /* VREPRINT */
1308 #ifdef VWERASE
1309 tty.main.c_cc[VWERASE] = CDISABLE;
1310 #endif /* VWERASE */
1311 #ifdef VDISCARD
1312 tty.main.c_cc[VDISCARD] = CDISABLE;
1313 #endif /* VDISCARD */
1314 #ifdef VSTART
1315 tty.main.c_cc[VSTART] = CDISABLE;
1316 #endif /* VSTART */
1317 #ifdef VSTOP
1318 tty.main.c_cc[VSTOP] = CDISABLE;
1319 #endif /* VSTOP */
1320 #endif /* mips or HAVE_TCATTR */
1321 #ifdef SET_LINE_DISCIPLINE
1322 /* Need to explicitly request TERMIODISC line discipline or
1323 Ultrix's termios does not work correctly. */
1324 tty.main.c_line = SET_LINE_DISCIPLINE;
1325 #endif
1326 #ifdef AIX
1327 #ifndef IBMR2AIX
1328 /* AIX enhanced edit loses NULs, so disable it. */
1329 tty.main.c_line = 0;
1330 tty.main.c_iflag &= ~ASCEDIT;
1331 #else
1332 tty.main.c_cc[VSTRT] = 255;
1333 tty.main.c_cc[VSTOP] = 255;
1334 tty.main.c_cc[VSUSP] = 255;
1335 tty.main.c_cc[VDSUSP] = 255;
1336 #endif /* IBMR2AIX */
1337 /* Also, PTY overloads NUL and BREAK.
1338 don't ignore break, but don't signal either, so it looks like NUL.
1339 This really serves a purpose only if running in an XTERM window
1340 or via TELNET or the like, but does no harm elsewhere. */
1341 tty.main.c_iflag &= ~IGNBRK;
1342 tty.main.c_iflag &= ~BRKINT;
1343 #endif
1344 #else /* if not HAVE_TERMIO */
1345 #ifdef VMS
1346 tty.main.tt_char |= TT$M_NOECHO;
1347 if (meta_key)
1348 tty.main.tt_char |= TT$M_EIGHTBIT;
1349 if (flow_control)
1350 tty.main.tt_char |= TT$M_TTSYNC;
1351 else
1352 tty.main.tt_char &= ~TT$M_TTSYNC;
1353 tty.main.tt2_char |= TT2$M_PASTHRU | TT2$M_XON;
1354 #else /* not VMS (BSD, that is) */
1355 #ifndef DOS_NT
1356 tty.main.sg_flags &= ~(ECHO | CRMOD | XTABS);
1357 if (meta_key)
1358 tty.main.sg_flags |= ANYP;
1359 tty.main.sg_flags |= interrupt_input ? RAW : CBREAK;
1360 #endif /* not DOS_NT */
1361 #endif /* not VMS (BSD, that is) */
1362 #endif /* not HAVE_TERMIO */
1363
1364 /* If going to use CBREAK mode, we must request C-g to interrupt
1365 and turn off start and stop chars, etc. If not going to use
1366 CBREAK mode, do this anyway so as to turn off local flow
1367 control for user coming over network on 4.2; in this case,
1368 only t_stopc and t_startc really matter. */
1369 #ifndef HAVE_TERMIO
1370 #ifdef HAVE_TCHARS
1371 /* Note: if not using CBREAK mode, it makes no difference how we
1372 set this */
1373 tty.tchars = new_tchars;
1374 tty.tchars.t_intrc = quit_char;
1375 if (flow_control)
1376 {
1377 tty.tchars.t_startc = '\021';
1378 tty.tchars.t_stopc = '\023';
1379 }
1380
1381 tty.lmode = LDECCTQ | LLITOUT | LPASS8 | LNOFLSH | old_tty.lmode;
1382 #ifdef ultrix
1383 /* Under Ultrix 4.2a, leaving this out doesn't seem to hurt
1384 anything, and leaving it in breaks the meta key. Go figure. */
1385 tty.lmode &= ~LLITOUT;
1386 #endif
1387
1388 #ifdef BSD4_1
1389 lmode = tty.lmode;
1390 #endif
1391
1392 #endif /* HAVE_TCHARS */
1393 #endif /* not HAVE_TERMIO */
1394
1395 #ifdef HAVE_LTCHARS
1396 tty.ltchars = new_ltchars;
1397 #endif /* HAVE_LTCHARS */
1398 #ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
1399 if (!term_initted)
1400 internal_terminal_init ();
1401 dos_ttraw ();
1402 #endif
1403
1404 EMACS_SET_TTY (input_fd, &tty, 0);
1405
1406 /* This code added to insure that, if flow-control is not to be used,
1407 we have an unlocked terminal at the start. */
1408
1409 #ifdef TCXONC
1410 if (!flow_control) ioctl (input_fd, TCXONC, 1);
1411 #endif
1412 #ifndef APOLLO
1413 #ifdef TIOCSTART
1414 if (!flow_control) ioctl (input_fd, TIOCSTART, 0);
1415 #endif
1416 #endif
1417
1418 #if defined (HAVE_TERMIOS) || defined (HPUX9)
1419 #ifdef TCOON
1420 if (!flow_control) tcflow (input_fd, TCOON);
1421 #endif
1422 #endif
1423
1424 #ifdef AIXHFT
1425 hft_init ();
1426 #ifdef IBMR2AIX
1427 {
1428 /* IBM's HFT device usually thinks a ^J should be LF/CR. We need it
1429 to be only LF. This is the way that is done. */
1430 struct termio tty;
1431
1432 if (ioctl (1, HFTGETID, &tty) != -1)
1433 write (1, "\033[20l", 5);
1434 }
1435 #endif
1436 #endif /* AIXHFT */
1437
1438 #ifdef VMS
1439 /* Appears to do nothing when in PASTHRU mode.
1440 SYS$QIOW (0, input_fd, IO$_SETMODE|IO$M_OUTBAND, 0, 0, 0,
1441 interrupt_signal, oob_chars, 0, 0, 0, 0);
1442 */
1443 queue_kbd_input (0);
1444 #endif /* VMS */
1445 }
1446
1447 #ifdef F_SETFL
1448 #ifndef F_SETOWN_BUG
1449 #ifdef F_GETOWN /* F_SETFL does not imply existence of F_GETOWN */
1450 if (interrupt_input
1451 && ! read_socket_hook && EQ (Vwindow_system, Qnil))
1452 {
1453 old_fcntl_owner = fcntl (input_fd, F_GETOWN, 0);
1454 fcntl (input_fd, F_SETOWN, getpid ());
1455 init_sigio (input_fd);
1456 }
1457 #endif /* F_GETOWN */
1458 #endif /* F_SETOWN_BUG */
1459 #endif /* F_SETFL */
1460
1461 #ifdef BSD4_1
1462 if (interrupt_input)
1463 init_sigio (input_fd);
1464 #endif
1465
1466 #ifdef VMS /* VMS sometimes has this symbol but lacks setvbuf. */
1467 #undef _IOFBF
1468 #endif
1469 #ifdef _IOFBF
1470 /* This symbol is defined on recent USG systems.
1471 Someone says without this call USG won't really buffer the file
1472 even with a call to setbuf. */
1473 setvbuf (stdout, _sobuf, _IOFBF, sizeof _sobuf);
1474 #else
1475 setbuf (stdout, _sobuf);
1476 #endif
1477 #ifdef HAVE_WINDOW_SYSTEM
1478 /* Emacs' window system on MSDOG uses the `internal terminal' and therefore
1479 needs the initialization code below. */
1480 if (! read_socket_hook && EQ (Vwindow_system, Qnil))
1481 #endif
1482 set_terminal_modes ();
1483
1484 if (term_initted && no_redraw_on_reenter)
1485 {
1486 if (display_completed)
1487 direct_output_forward_char (0);
1488 }
1489 else
1490 {
1491 frame_garbaged = 1;
1492 #ifdef MULTI_FRAME
1493 if (FRAMEP (Vterminal_frame))
1494 FRAME_GARBAGED_P (XFRAME (Vterminal_frame)) = 1;
1495 #endif
1496 }
1497
1498 term_initted = 1;
1499 }
1500
1501 /* Return nonzero if safe to use tabs in output.
1502 At the time this is called, init_sys_modes has not been done yet. */
1503
1504 tabs_safe_p ()
1505 {
1506 struct emacs_tty tty;
1507
1508 EMACS_GET_TTY (input_fd, &tty);
1509 return EMACS_TTY_TABS_OK (&tty);
1510 }
1511 \f
1512 /* Get terminal size from system.
1513 Store number of lines into *HEIGHTP and width into *WIDTHP.
1514 We store 0 if there's no valid information. */
1515
1516 get_frame_size (widthp, heightp)
1517 int *widthp, *heightp;
1518 {
1519
1520 #ifdef TIOCGWINSZ
1521
1522 /* BSD-style. */
1523 struct winsize size;
1524
1525 if (ioctl (input_fd, TIOCGWINSZ, &size) == -1)
1526 *widthp = *heightp = 0;
1527 else
1528 {
1529 *widthp = size.ws_col;
1530 *heightp = size.ws_row;
1531 }
1532
1533 #else
1534 #ifdef TIOCGSIZE
1535
1536 /* SunOS - style. */
1537 struct ttysize size;
1538
1539 if (ioctl (input_fd, TIOCGSIZE, &size) == -1)
1540 *widthp = *heightp = 0;
1541 else
1542 {
1543 *widthp = size.ts_cols;
1544 *heightp = size.ts_lines;
1545 }
1546
1547 #else
1548 #ifdef VMS
1549
1550 struct sensemode tty;
1551
1552 SYS$QIOW (0, input_fd, IO$_SENSEMODE, &tty, 0, 0,
1553 &tty.class, 12, 0, 0, 0, 0);
1554 *widthp = tty.scr_wid;
1555 *heightp = tty.scr_len;
1556
1557 #else
1558 #ifdef MSDOS
1559 *widthp = ScreenCols ();
1560 *heightp = ScreenRows ();
1561 #else /* system doesn't know size */
1562 *widthp = 0;
1563 *heightp = 0;
1564 #endif
1565
1566 #endif /* not VMS */
1567 #endif /* not SunOS-style */
1568 #endif /* not BSD-style */
1569 }
1570
1571 /* Set the logical window size associated with descriptor FD
1572 to HEIGHT and WIDTH. This is used mainly with ptys. */
1573
1574 int
1575 set_window_size (fd, height, width)
1576 int fd, height, width;
1577 {
1578 #ifdef TIOCSWINSZ
1579
1580 /* BSD-style. */
1581 struct winsize size;
1582 size.ws_row = height;
1583 size.ws_col = width;
1584
1585 if (ioctl (fd, TIOCSWINSZ, &size) == -1)
1586 return 0; /* error */
1587 else
1588 return 1;
1589
1590 #else
1591 #ifdef TIOCSSIZE
1592
1593 /* SunOS - style. */
1594 struct ttysize size;
1595 size.ts_lines = height;
1596 size.ts_cols = width;
1597
1598 if (ioctl (fd, TIOCGSIZE, &size) == -1)
1599 return 0;
1600 else
1601 return 1;
1602 #else
1603 return -1;
1604 #endif /* not SunOS-style */
1605 #endif /* not BSD-style */
1606 }
1607
1608 \f
1609 /* Prepare the terminal for exiting Emacs; move the cursor to the
1610 bottom of the frame, turn off interrupt-driven I/O, etc. */
1611 reset_sys_modes ()
1612 {
1613 if (noninteractive)
1614 {
1615 fflush (stdout);
1616 return;
1617 }
1618 if (!term_initted)
1619 return;
1620 #ifdef HAVE_WINDOW_SYSTEM
1621 /* Emacs' window system on MSDOG uses the `internal terminal' and therefore
1622 needs the clean-up code below. */
1623 if (read_socket_hook || !EQ (Vwindow_system, Qnil))
1624 return;
1625 #endif
1626 cursor_to (FRAME_HEIGHT (selected_frame) - 1, 0);
1627 clear_end_of_line (FRAME_WIDTH (selected_frame));
1628 /* clear_end_of_line may move the cursor */
1629 cursor_to (FRAME_HEIGHT (selected_frame) - 1, 0);
1630 #if defined (IBMR2AIX) && defined (AIXHFT)
1631 {
1632 /* HFT devices normally use ^J as a LF/CR. We forced it to
1633 do the LF only. Now, we need to reset it. */
1634 struct termio tty;
1635
1636 if (ioctl (1, HFTGETID, &tty) != -1)
1637 write (1, "\033[20h", 5);
1638 }
1639 #endif
1640
1641 reset_terminal_modes ();
1642 fflush (stdout);
1643 #ifdef BSD
1644 #ifndef BSD4_1
1645 /* Avoid possible loss of output when changing terminal modes. */
1646 fsync (fileno (stdout));
1647 #endif
1648 #endif
1649
1650 #ifdef F_SETFL
1651 #ifndef F_SETOWN_BUG
1652 #ifdef F_SETOWN /* F_SETFL does not imply existence of F_SETOWN */
1653 if (interrupt_input)
1654 {
1655 reset_sigio ();
1656 fcntl (input_fd, F_SETOWN, old_fcntl_owner);
1657 }
1658 #endif /* F_SETOWN */
1659 #endif /* F_SETOWN_BUG */
1660 #ifdef O_NDELAY
1661 fcntl (input_fd, F_SETFL, fcntl (input_fd, F_GETFL, 0) & ~O_NDELAY);
1662 #endif
1663 #endif /* F_SETFL */
1664 #ifdef BSD4_1
1665 if (interrupt_input)
1666 reset_sigio ();
1667 #endif /* BSD4_1 */
1668
1669 if (old_tty_valid)
1670 while (EMACS_SET_TTY (input_fd, &old_tty, 0) < 0 && errno == EINTR)
1671 ;
1672
1673 #ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida */
1674 dos_ttcooked ();
1675 #endif
1676
1677 #ifdef SET_LINE_DISCIPLINE
1678 /* Ultrix's termios *ignores* any line discipline except TERMIODISC.
1679 A different old line discipline is therefore not restored, yet.
1680 Restore the old line discipline by hand. */
1681 ioctl (0, TIOCSETD, &old_tty.main.c_line);
1682 #endif
1683
1684 #ifdef AIXHFT
1685 hft_reset ();
1686 #endif
1687
1688 #ifdef BSD_PGRPS
1689 widen_foreground_group ();
1690 #endif
1691 }
1692 \f
1693 #ifdef HAVE_PTYS
1694
1695 /* Set up the proper status flags for use of a pty. */
1696
1697 setup_pty (fd)
1698 int fd;
1699 {
1700 /* I'm told that TOICREMOTE does not mean control chars
1701 "can't be sent" but rather that they don't have
1702 input-editing or signaling effects.
1703 That should be good, because we have other ways
1704 to do those things in Emacs.
1705 However, telnet mode seems not to work on 4.2.
1706 So TIOCREMOTE is turned off now. */
1707
1708 /* Under hp-ux, if TIOCREMOTE is turned on, some calls
1709 will hang. In particular, the "timeout" feature (which
1710 causes a read to return if there is no data available)
1711 does this. Also it is known that telnet mode will hang
1712 in such a way that Emacs must be stopped (perhaps this
1713 is the same problem).
1714
1715 If TIOCREMOTE is turned off, then there is a bug in
1716 hp-ux which sometimes loses data. Apparently the
1717 code which blocks the master process when the internal
1718 buffer fills up does not work. Other than this,
1719 though, everything else seems to work fine.
1720
1721 Since the latter lossage is more benign, we may as well
1722 lose that way. -- cph */
1723 #ifdef FIONBIO
1724 #ifdef SYSV_PTYS
1725 {
1726 int on = 1;
1727 ioctl (fd, FIONBIO, &on);
1728 }
1729 #endif
1730 #endif
1731 #ifdef IBMRTAIX
1732 /* On AIX, the parent gets SIGHUP when a pty attached child dies. So, we */
1733 /* ignore SIGHUP once we've started a child on a pty. Note that this may */
1734 /* cause EMACS not to die when it should, i.e., when its own controlling */
1735 /* tty goes away. I've complained to the AIX developers, and they may */
1736 /* change this behavior, but I'm not going to hold my breath. */
1737 signal (SIGHUP, SIG_IGN);
1738 #endif
1739 }
1740 #endif /* HAVE_PTYS */
1741 \f
1742 #ifdef VMS
1743
1744 /* Assigning an input channel is done at the start of Emacs execution.
1745 This is called each time Emacs is resumed, also, but does nothing
1746 because input_chain is no longer zero. */
1747
1748 init_vms_input ()
1749 {
1750 int status;
1751
1752 if (input_fd == 0)
1753 {
1754 status = SYS$ASSIGN (&input_dsc, &input_fd, 0, 0);
1755 if (! (status & 1))
1756 LIB$STOP (status);
1757 }
1758 }
1759
1760 /* Deassigning the input channel is done before exiting. */
1761
1762 stop_vms_input ()
1763 {
1764 return SYS$DASSGN (input_fd);
1765 }
1766
1767 short input_buffer;
1768
1769 /* Request reading one character into the keyboard buffer.
1770 This is done as soon as the buffer becomes empty. */
1771
1772 queue_kbd_input ()
1773 {
1774 int status;
1775 extern kbd_input_ast ();
1776
1777 waiting_for_ast = 0;
1778 stop_input = 0;
1779 status = SYS$QIO (0, input_fd, IO$_READVBLK,
1780 &input_iosb, kbd_input_ast, 1,
1781 &input_buffer, 1, 0, terminator_mask, 0, 0);
1782 }
1783
1784 int input_count;
1785
1786 /* Ast routine that is called when keyboard input comes in
1787 in accord with the SYS$QIO above. */
1788
1789 kbd_input_ast ()
1790 {
1791 register int c = -1;
1792 int old_errno = errno;
1793 extern EMACS_TIME *input_available_clear_time;
1794
1795 if (waiting_for_ast)
1796 SYS$SETEF (input_ef);
1797 waiting_for_ast = 0;
1798 input_count++;
1799 #ifdef ASTDEBUG
1800 if (input_count == 25)
1801 exit (1);
1802 printf ("Ast # %d,", input_count);
1803 printf (" iosb = %x, %x, %x, %x",
1804 input_iosb.offset, input_iosb.status, input_iosb.termlen,
1805 input_iosb.term);
1806 #endif
1807 if (input_iosb.offset)
1808 {
1809 c = input_buffer;
1810 #ifdef ASTDEBUG
1811 printf (", char = 0%o", c);
1812 #endif
1813 }
1814 #ifdef ASTDEBUG
1815 printf ("\n");
1816 fflush (stdout);
1817 sleep (1);
1818 #endif
1819 if (! stop_input)
1820 queue_kbd_input ();
1821 if (c >= 0)
1822 {
1823 struct input_event e;
1824 e.kind = ascii_keystroke;
1825 XSETINT (e.code, c);
1826 XSETFRAME (e.frame_or_window, selected_frame);
1827 kbd_buffer_store_event (&e);
1828 }
1829 if (input_available_clear_time)
1830 EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
1831 errno = old_errno;
1832 }
1833
1834 /* Wait until there is something in kbd_buffer. */
1835
1836 wait_for_kbd_input ()
1837 {
1838 extern int have_process_input, process_exited;
1839
1840 /* If already something, avoid doing system calls. */
1841 if (detect_input_pending ())
1842 {
1843 return;
1844 }
1845 /* Clear a flag, and tell ast routine above to set it. */
1846 SYS$CLREF (input_ef);
1847 waiting_for_ast = 1;
1848 /* Check for timing error: ast happened while we were doing that. */
1849 if (!detect_input_pending ())
1850 {
1851 /* No timing error: wait for flag to be set. */
1852 set_waiting_for_input (0);
1853 SYS$WFLOR (input_ef, input_eflist);
1854 clear_waiting_for_input (0);
1855 if (!detect_input_pending ())
1856 /* Check for subprocess input availability */
1857 {
1858 int dsp = have_process_input || process_exited;
1859
1860 SYS$CLREF (process_ef);
1861 if (have_process_input)
1862 process_command_input ();
1863 if (process_exited)
1864 process_exit ();
1865 if (dsp)
1866 {
1867 update_mode_lines++;
1868 prepare_menu_bars ();
1869 redisplay_preserve_echo_area ();
1870 }
1871 }
1872 }
1873 waiting_for_ast = 0;
1874 }
1875
1876 /* Get rid of any pending QIO, when we are about to suspend
1877 or when we want to throw away pending input.
1878 We wait for a positive sign that the AST routine has run
1879 and therefore there is no I/O request queued when we return.
1880 SYS$SETAST is used to avoid a timing error. */
1881
1882 end_kbd_input ()
1883 {
1884 #ifdef ASTDEBUG
1885 printf ("At end_kbd_input.\n");
1886 fflush (stdout);
1887 sleep (1);
1888 #endif
1889 if (LIB$AST_IN_PROG ()) /* Don't wait if suspending from kbd_buffer_store_event! */
1890 {
1891 SYS$CANCEL (input_fd);
1892 return;
1893 }
1894
1895 SYS$SETAST (0);
1896 /* Clear a flag, and tell ast routine above to set it. */
1897 SYS$CLREF (input_ef);
1898 waiting_for_ast = 1;
1899 stop_input = 1;
1900 SYS$CANCEL (input_fd);
1901 SYS$SETAST (1);
1902 SYS$WAITFR (input_ef);
1903 waiting_for_ast = 0;
1904 }
1905
1906 /* Wait for either input available or time interval expiry. */
1907
1908 input_wait_timeout (timeval)
1909 int timeval; /* Time to wait, in seconds */
1910 {
1911 int time [2];
1912 static int zero = 0;
1913 static int large = -10000000;
1914
1915 LIB$EMUL (&timeval, &large, &zero, time); /* Convert to VMS format */
1916
1917 /* If already something, avoid doing system calls. */
1918 if (detect_input_pending ())
1919 {
1920 return;
1921 }
1922 /* Clear a flag, and tell ast routine above to set it. */
1923 SYS$CLREF (input_ef);
1924 waiting_for_ast = 1;
1925 /* Check for timing error: ast happened while we were doing that. */
1926 if (!detect_input_pending ())
1927 {
1928 /* No timing error: wait for flag to be set. */
1929 SYS$CANTIM (1, 0);
1930 if (SYS$SETIMR (timer_ef, time, 0, 1) & 1) /* Set timer */
1931 SYS$WFLOR (timer_ef, timer_eflist); /* Wait for timer expiry or input */
1932 }
1933 waiting_for_ast = 0;
1934 }
1935
1936 /* The standard `sleep' routine works some other way
1937 and it stops working if you have ever quit out of it.
1938 This one continues to work. */
1939
1940 sys_sleep (timeval)
1941 int timeval;
1942 {
1943 int time [2];
1944 static int zero = 0;
1945 static int large = -10000000;
1946
1947 LIB$EMUL (&timeval, &large, &zero, time); /* Convert to VMS format */
1948
1949 SYS$CANTIM (1, 0);
1950 if (SYS$SETIMR (timer_ef, time, 0, 1) & 1) /* Set timer */
1951 SYS$WAITFR (timer_ef); /* Wait for timer expiry only */
1952 }
1953
1954 init_sigio (fd)
1955 int fd;
1956 {
1957 request_sigio ();
1958 }
1959
1960 reset_sigio ()
1961 {
1962 unrequest_sigio ();
1963 }
1964
1965 request_sigio ()
1966 {
1967 croak ("request sigio");
1968 }
1969
1970 unrequest_sigio ()
1971 {
1972 croak ("unrequest sigio");
1973 }
1974
1975 #endif /* VMS */
1976 \f
1977 /* Note that VMS compiler won't accept defined (CANNOT_DUMP). */
1978 #ifndef CANNOT_DUMP
1979 #define NEED_STARTS
1980 #endif
1981
1982 #ifndef SYSTEM_MALLOC
1983 #ifndef NEED_STARTS
1984 #define NEED_STARTS
1985 #endif
1986 #endif
1987
1988 #ifdef NEED_STARTS
1989 /* Some systems that cannot dump also cannot implement these. */
1990
1991 /*
1992 * Return the address of the start of the text segment prior to
1993 * doing an unexec. After unexec the return value is undefined.
1994 * See crt0.c for further explanation and _start.
1995 *
1996 */
1997
1998 #ifndef HAVE_TEXT_START
1999 char *
2000 start_of_text ()
2001 {
2002 #ifdef TEXT_START
2003 return ((char *) TEXT_START);
2004 #else
2005 #ifdef GOULD
2006 extern csrt ();
2007 return ((char *) csrt);
2008 #else /* not GOULD */
2009 extern int _start ();
2010 return ((char *) _start);
2011 #endif /* GOULD */
2012 #endif /* TEXT_START */
2013 }
2014 #endif /* not HAVE_TEXT_START */
2015
2016 /*
2017 * Return the address of the start of the data segment prior to
2018 * doing an unexec. After unexec the return value is undefined.
2019 * See crt0.c for further information and definition of data_start.
2020 *
2021 * Apparently, on BSD systems this is etext at startup. On
2022 * USG systems (swapping) this is highly mmu dependent and
2023 * is also dependent on whether or not the program is running
2024 * with shared text. Generally there is a (possibly large)
2025 * gap between end of text and start of data with shared text.
2026 *
2027 * On Uniplus+ systems with shared text, data starts at a
2028 * fixed address. Each port (from a given oem) is generally
2029 * different, and the specific value of the start of data can
2030 * be obtained via the UniPlus+ specific "uvar" system call,
2031 * however the method outlined in crt0.c seems to be more portable.
2032 *
2033 * Probably what will have to happen when a USG unexec is available,
2034 * at least on UniPlus, is temacs will have to be made unshared so
2035 * that text and data are contiguous. Then once loadup is complete,
2036 * unexec will produce a shared executable where the data can be
2037 * at the normal shared text boundary and the startofdata variable
2038 * will be patched by unexec to the correct value.
2039 *
2040 */
2041
2042 char *
2043 start_of_data ()
2044 {
2045 #ifdef DATA_START
2046 return ((char *) DATA_START);
2047 #else
2048 #ifdef ORDINARY_LINK
2049 /*
2050 * This is a hack. Since we're not linking crt0.c or pre_crt0.c,
2051 * data_start isn't defined. We take the address of environ, which
2052 * is known to live at or near the start of the system crt0.c, and
2053 * we don't sweat the handful of bytes that might lose.
2054 */
2055 extern char **environ;
2056
2057 return((char *) &environ);
2058 #else
2059 extern int data_start;
2060 return ((char *) &data_start);
2061 #endif /* ORDINARY_LINK */
2062 #endif /* DATA_START */
2063 }
2064 #endif /* NEED_STARTS (not CANNOT_DUMP or not SYSTEM_MALLOC) */
2065
2066 #ifndef CANNOT_DUMP
2067 /* Some systems that cannot dump also cannot implement these. */
2068
2069 /*
2070 * Return the address of the end of the text segment prior to
2071 * doing an unexec. After unexec the return value is undefined.
2072 */
2073
2074 char *
2075 end_of_text ()
2076 {
2077 #ifdef TEXT_END
2078 return ((char *) TEXT_END);
2079 #else
2080 extern int etext;
2081 return ((char *) &etext);
2082 #endif
2083 }
2084
2085 /*
2086 * Return the address of the end of the data segment prior to
2087 * doing an unexec. After unexec the return value is undefined.
2088 */
2089
2090 char *
2091 end_of_data ()
2092 {
2093 #ifdef DATA_END
2094 return ((char *) DATA_END);
2095 #else
2096 extern int edata;
2097 return ((char *) &edata);
2098 #endif
2099 }
2100
2101 #endif /* not CANNOT_DUMP */
2102 \f
2103 /* init_system_name sets up the string for the Lisp function
2104 system-name to return. */
2105
2106 #ifdef BSD4_1
2107 #include <whoami.h>
2108 #endif
2109
2110 extern Lisp_Object Vsystem_name;
2111
2112 #ifndef BSD4_1
2113 #ifndef VMS
2114 #ifdef HAVE_SOCKETS
2115 #include <sys/socket.h>
2116 #include <netdb.h>
2117 #endif /* HAVE_SOCKETS */
2118 #endif /* not VMS */
2119 #endif /* not BSD4_1 */
2120
2121 void
2122 init_system_name ()
2123 {
2124 #ifdef BSD4_1
2125 Vsystem_name = build_string (sysname);
2126 #else
2127 #ifdef VMS
2128 char *sp, *end;
2129 if ((sp = egetenv ("SYS$NODE")) == 0)
2130 Vsystem_name = build_string ("vax-vms");
2131 else if ((end = index (sp, ':')) == 0)
2132 Vsystem_name = build_string (sp);
2133 else
2134 Vsystem_name = make_string (sp, end - sp);
2135 #else
2136 #ifndef HAVE_GETHOSTNAME
2137 struct utsname uts;
2138 uname (&uts);
2139 Vsystem_name = build_string (uts.nodename);
2140 #else /* HAVE_GETHOSTNAME */
2141 unsigned int hostname_size = 256;
2142 char *hostname = (char *) alloca (hostname_size);
2143
2144 /* Try to get the host name; if the buffer is too short, try
2145 again. Apparently, the only indication gethostname gives of
2146 whether the buffer was large enough is the presence or absence
2147 of a '\0' in the string. Eech. */
2148 for (;;)
2149 {
2150 gethostname (hostname, hostname_size - 1);
2151 hostname[hostname_size - 1] = '\0';
2152
2153 /* Was the buffer large enough for the '\0'? */
2154 if (strlen (hostname) < hostname_size - 1)
2155 break;
2156
2157 hostname_size <<= 1;
2158 hostname = (char *) alloca (hostname_size);
2159 }
2160 #ifdef HAVE_SOCKETS
2161 /* Turn the hostname into the official, fully-qualified hostname.
2162 Don't do this if we're going to dump; this can confuse system
2163 libraries on some machines and make the dumped emacs core dump. */
2164 #ifndef CANNOT_DUMP
2165 if (initialized)
2166 #endif /* not CANNOT_DUMP */
2167 {
2168 struct hostent *hp;
2169 int count;
2170 for (count = 0; count < 10; count++)
2171 {
2172 #ifdef TRY_AGAIN
2173 h_errno = 0;
2174 #endif
2175 hp = gethostbyname (hostname);
2176 #ifdef TRY_AGAIN
2177 if (! (hp == 0 && h_errno == TRY_AGAIN))
2178 #endif
2179 break;
2180 Fsleep_for (make_number (1), Qnil);
2181 }
2182 if (hp)
2183 {
2184 char *fqdn = (char *) hp->h_name;
2185 char *p;
2186
2187 if (!index (fqdn, '.'))
2188 {
2189 /* We still don't have a fully qualified domain name.
2190 Try to find one in the list of alternate names */
2191 char **alias = hp->h_aliases;
2192 while (*alias && !index (*alias, '.'))
2193 alias++;
2194 if (*alias)
2195 fqdn = *alias;
2196 }
2197 hostname = fqdn;
2198 #if 0
2199 /* Convert the host name to lower case. */
2200 /* Using ctype.h here would introduce a possible locale
2201 dependence that is probably wrong for hostnames. */
2202 p = hostname;
2203 while (*p)
2204 {
2205 if (*p >= 'A' && *p <= 'Z')
2206 *p += 'a' - 'A';
2207 p++;
2208 }
2209 #endif
2210 }
2211 }
2212 #endif /* HAVE_SOCKETS */
2213 Vsystem_name = build_string (hostname);
2214 #endif /* HAVE_GETHOSTNAME */
2215 #endif /* VMS */
2216 #endif /* BSD4_1 */
2217 {
2218 unsigned char *p;
2219 for (p = XSTRING (Vsystem_name)->data; *p; p++)
2220 if (*p == ' ' || *p == '\t')
2221 *p = '-';
2222 }
2223 }
2224 \f
2225 #ifndef MSDOS
2226 #ifndef VMS
2227 #if !defined (HAVE_SELECT) || defined (BROKEN_SELECT_NON_X)
2228
2229 #include "sysselect.h"
2230 #undef select
2231
2232 #if defined (HAVE_X_WINDOWS) && !defined (HAVE_SELECT)
2233 /* Cause explanatory error message at compile time,
2234 since the select emulation is not good enough for X. */
2235 int *x = &x_windows_lose_if_no_select_system_call;
2236 #endif
2237
2238 /* Emulate as much as select as is possible under 4.1 and needed by Gnu Emacs
2239 * Only checks read descriptors.
2240 */
2241 /* How long to wait between checking fds in select */
2242 #define SELECT_PAUSE 1
2243 int select_alarmed;
2244
2245 /* For longjmp'ing back to read_input_waiting. */
2246
2247 jmp_buf read_alarm_throw;
2248
2249 /* Nonzero if the alarm signal should throw back to read_input_waiting.
2250 The read_socket_hook function sets this to 1 while it is waiting. */
2251
2252 int read_alarm_should_throw;
2253
2254 SIGTYPE
2255 select_alarm ()
2256 {
2257 select_alarmed = 1;
2258 #ifdef BSD4_1
2259 sigrelse (SIGALRM);
2260 #else /* not BSD4_1 */
2261 signal (SIGALRM, SIG_IGN);
2262 #endif /* not BSD4_1 */
2263 if (read_alarm_should_throw)
2264 longjmp (read_alarm_throw, 1);
2265 }
2266
2267 #ifndef WINDOWSNT
2268 /* Only rfds are checked. */
2269 int
2270 sys_select (nfds, rfds, wfds, efds, timeout)
2271 int nfds;
2272 SELECT_TYPE *rfds, *wfds, *efds;
2273 EMACS_TIME *timeout;
2274 {
2275 int ravail = 0, old_alarm;
2276 SELECT_TYPE orfds;
2277 int timeoutval;
2278 int *local_timeout;
2279 extern int proc_buffered_char[];
2280 #ifndef subprocesses
2281 int process_tick = 0, update_tick = 0;
2282 #else
2283 extern int process_tick, update_tick;
2284 #endif
2285 SIGTYPE (*old_trap) ();
2286 unsigned char buf;
2287
2288 #if defined (HAVE_SELECT) && defined (HAVE_X_WINDOWS)
2289 /* If we're using X, then the native select will work; we only need the
2290 emulation for non-X usage. */
2291 if (!NILP (Vwindow_system))
2292 return select (nfds, rfds, wfds, efds, timeout);
2293 #endif
2294 timeoutval = timeout ? EMACS_SECS (*timeout) : 100000;
2295 local_timeout = &timeoutval;
2296 FD_ZERO (&orfds);
2297 if (rfds)
2298 {
2299 orfds = *rfds;
2300 FD_ZERO (rfds);
2301 }
2302 if (wfds)
2303 FD_ZERO (wfds);
2304 if (efds)
2305 FD_ZERO (efds);
2306
2307 /* If we are looking only for the terminal, with no timeout,
2308 just read it and wait -- that's more efficient. */
2309 if (*local_timeout == 100000 && process_tick == update_tick
2310 && FD_ISSET (0, &orfds))
2311 {
2312 int fd;
2313 for (fd = 1; fd < nfds; ++fd)
2314 if (FD_ISSET (fd, &orfds))
2315 goto hardway;
2316 if (! detect_input_pending ())
2317 read_input_waiting ();
2318 FD_SET (0, rfds);
2319 return 1;
2320 }
2321
2322 hardway:
2323 /* Once a second, till the timer expires, check all the flagged read
2324 * descriptors to see if any input is available. If there is some then
2325 * set the corresponding bit in the return copy of rfds.
2326 */
2327 while (1)
2328 {
2329 register int to_check, fd;
2330
2331 if (rfds)
2332 {
2333 for (to_check = nfds, fd = 0; --to_check >= 0; fd++)
2334 {
2335 if (FD_ISSET (fd, &orfds))
2336 {
2337 int avail = 0, status = 0;
2338
2339 if (fd == 0)
2340 avail = detect_input_pending (); /* Special keyboard handler */
2341 else
2342 {
2343 #ifdef FIONREAD
2344 status = ioctl (fd, FIONREAD, &avail);
2345 #else /* no FIONREAD */
2346 /* Hoping it will return -1 if nothing available
2347 or 0 if all 0 chars requested are read. */
2348 if (proc_buffered_char[fd] >= 0)
2349 avail = 1;
2350 else
2351 {
2352 avail = read (fd, &buf, 1);
2353 if (avail > 0)
2354 proc_buffered_char[fd] = buf;
2355 }
2356 #endif /* no FIONREAD */
2357 }
2358 if (status >= 0 && avail > 0)
2359 {
2360 FD_SET (fd, rfds);
2361 ravail++;
2362 }
2363 }
2364 }
2365 }
2366 if (*local_timeout == 0 || ravail != 0 || process_tick != update_tick)
2367 break;
2368 old_alarm = alarm (0);
2369 old_trap = signal (SIGALRM, select_alarm);
2370 select_alarmed = 0;
2371 alarm (SELECT_PAUSE);
2372 /* Wait for a SIGALRM (or maybe a SIGTINT) */
2373 while (select_alarmed == 0 && *local_timeout != 0
2374 && process_tick == update_tick)
2375 {
2376 /* If we are interested in terminal input,
2377 wait by reading the terminal.
2378 That makes instant wakeup for terminal input at least. */
2379 if (FD_ISSET (0, &orfds))
2380 {
2381 read_input_waiting ();
2382 if (detect_input_pending ())
2383 select_alarmed = 1;
2384 }
2385 else
2386 pause ();
2387 }
2388 (*local_timeout) -= SELECT_PAUSE;
2389 /* Reset the old alarm if there was one */
2390 alarm (0);
2391 signal (SIGALRM, old_trap);
2392 if (old_alarm != 0)
2393 {
2394 /* Reset or forge an interrupt for the original handler. */
2395 old_alarm -= SELECT_PAUSE;
2396 if (old_alarm <= 0)
2397 kill (getpid (), SIGALRM); /* Fake an alarm with the orig' handler */
2398 else
2399 alarm (old_alarm);
2400 }
2401 if (*local_timeout == 0) /* Stop on timer being cleared */
2402 break;
2403 }
2404 return ravail;
2405 }
2406 #endif /* not WINDOWSNT */
2407
2408 /* Read keyboard input into the standard buffer,
2409 waiting for at least one character. */
2410
2411 /* Make all keyboard buffers much bigger when using a window system. */
2412 #ifdef HAVE_WINDOW_SYSTEM
2413 #define BUFFER_SIZE_FACTOR 16
2414 #else
2415 #define BUFFER_SIZE_FACTOR 1
2416 #endif
2417
2418 read_input_waiting ()
2419 {
2420 struct input_event e;
2421 int nread, i;
2422 extern int quit_char;
2423
2424 if (read_socket_hook)
2425 {
2426 struct input_event buf[256];
2427
2428 read_alarm_should_throw = 0;
2429 if (! setjmp (read_alarm_throw))
2430 nread = (*read_socket_hook) (0, buf, 256, 1, 0);
2431 else
2432 nread = -1;
2433
2434 /* Scan the chars for C-g and store them in kbd_buffer. */
2435 for (i = 0; i < nread; i++)
2436 {
2437 kbd_buffer_store_event (&buf[i]);
2438 /* Don't look at input that follows a C-g too closely.
2439 This reduces lossage due to autorepeat on C-g. */
2440 if (buf[i].kind == ascii_keystroke
2441 && buf[i].code == quit_char)
2442 break;
2443 }
2444 }
2445 else
2446 {
2447 char buf[3];
2448 nread = read (fileno (stdin), buf, 1);
2449
2450 /* Scan the chars for C-g and store them in kbd_buffer. */
2451 e.kind = ascii_keystroke;
2452 XSETFRAME (e.frame_or_window, selected_frame);
2453 e.modifiers = 0;
2454 for (i = 0; i < nread; i++)
2455 {
2456 /* Convert chars > 0177 to meta events if desired.
2457 We do this under the same conditions that read_avail_input does. */
2458 if (read_socket_hook == 0)
2459 {
2460 /* If the user says she has a meta key, then believe her. */
2461 if (meta_key == 1 && (buf[i] & 0x80))
2462 e.modifiers = meta_modifier;
2463 if (meta_key != 2)
2464 buf[i] &= ~0x80;
2465 }
2466
2467 XSETINT (e.code, buf[i]);
2468 kbd_buffer_store_event (&e);
2469 /* Don't look at input that follows a C-g too closely.
2470 This reduces lossage due to autorepeat on C-g. */
2471 if (buf[i] == quit_char)
2472 break;
2473 }
2474 }
2475 }
2476
2477 #endif /* not HAVE_SELECT */
2478 #endif /* not VMS */
2479 #endif /* not MSDOS */
2480 \f
2481 #ifdef BSD4_1
2482 /*
2483 * Partially emulate 4.2 open call.
2484 * open is defined as this in 4.1.
2485 *
2486 * - added by Michael Bloom @ Citicorp/TTI
2487 *
2488 */
2489
2490 int
2491 sys_open (path, oflag, mode)
2492 char *path;
2493 int oflag, mode;
2494 {
2495 if (oflag & O_CREAT)
2496 return creat (path, mode);
2497 else
2498 return open (path, oflag);
2499 }
2500
2501 init_sigio (fd)
2502 int fd;
2503 {
2504 if (noninteractive)
2505 return;
2506 lmode = LINTRUP | lmode;
2507 ioctl (fd, TIOCLSET, &lmode);
2508 }
2509
2510 reset_sigio ()
2511 {
2512 if (noninteractive)
2513 return;
2514 lmode = ~LINTRUP & lmode;
2515 ioctl (0, TIOCLSET, &lmode);
2516 }
2517
2518 request_sigio ()
2519 {
2520 sigrelse (SIGTINT);
2521
2522 interrupts_deferred = 0;
2523 }
2524
2525 unrequest_sigio ()
2526 {
2527 sighold (SIGTINT);
2528
2529 interrupts_deferred = 1;
2530 }
2531
2532 /* still inside #ifdef BSD4_1 */
2533 #ifdef subprocesses
2534
2535 int sigheld; /* Mask of held signals */
2536
2537 sigholdx (signum)
2538 int signum;
2539 {
2540 sigheld |= sigbit (signum);
2541 sighold (signum);
2542 }
2543
2544 sigisheld (signum)
2545 int signum;
2546 {
2547 sigheld |= sigbit (signum);
2548 }
2549
2550 sigunhold (signum)
2551 int signum;
2552 {
2553 sigheld &= ~sigbit (signum);
2554 sigrelse (signum);
2555 }
2556
2557 sigfree () /* Free all held signals */
2558 {
2559 int i;
2560 for (i = 0; i < NSIG; i++)
2561 if (sigheld & sigbit (i))
2562 sigrelse (i);
2563 sigheld = 0;
2564 }
2565
2566 sigbit (i)
2567 {
2568 return 1 << (i - 1);
2569 }
2570 #endif /* subprocesses */
2571 #endif /* BSD4_1 */
2572 \f
2573 /* POSIX signals support - DJB */
2574 /* Anyone with POSIX signals should have ANSI C declarations */
2575
2576 #ifdef POSIX_SIGNALS
2577
2578 sigset_t old_mask, empty_mask, full_mask, temp_mask;
2579 static struct sigaction new_action, old_action;
2580
2581 init_signals ()
2582 {
2583 sigemptyset (&empty_mask);
2584 sigfillset (&full_mask);
2585 }
2586
2587 signal_handler_t
2588 sys_signal (int signal_number, signal_handler_t action)
2589 {
2590 #ifdef DGUX
2591 /* This gets us restartable system calls for efficiency.
2592 The "else" code will works as well. */
2593 return (berk_signal (signal_number, action));
2594 #else
2595 sigemptyset (&new_action.sa_mask);
2596 new_action.sa_handler = action;
2597 #ifdef SA_RESTART
2598 /* Emacs mostly works better with restartable system services. If this
2599 * flag exists, we probably want to turn it on here.
2600 */
2601 new_action.sa_flags = SA_RESTART;
2602 #else
2603 new_action.sa_flags = 0;
2604 #endif
2605 sigaction (signal_number, &new_action, &old_action);
2606 return (old_action.sa_handler);
2607 #endif /* DGUX */
2608 }
2609
2610 #ifndef __GNUC__
2611 /* If we're compiling with GCC, we don't need this function, since it
2612 can be written as a macro. */
2613 sigset_t
2614 sys_sigmask (int sig)
2615 {
2616 sigset_t mask;
2617 sigemptyset (&mask);
2618 sigaddset (&mask, sig);
2619 return mask;
2620 }
2621 #endif
2622
2623 int
2624 sys_sigpause (sigset_t new_mask)
2625 {
2626 /* pause emulating berk sigpause... */
2627 sigsuspend (&new_mask);
2628 return (EINTR);
2629 }
2630
2631 /* I'd like to have these guys return pointers to the mask storage in here,
2632 but there'd be trouble if the code was saving multiple masks. I'll be
2633 safe and pass the structure. It normally won't be more than 2 bytes
2634 anyhow. - DJB */
2635
2636 sigset_t
2637 sys_sigblock (sigset_t new_mask)
2638 {
2639 sigset_t old_mask;
2640 sigprocmask (SIG_BLOCK, &new_mask, &old_mask);
2641 return (old_mask);
2642 }
2643
2644 sigset_t
2645 sys_sigunblock (sigset_t new_mask)
2646 {
2647 sigset_t old_mask;
2648 sigprocmask (SIG_UNBLOCK, &new_mask, &old_mask);
2649 return (old_mask);
2650 }
2651
2652 sigset_t
2653 sys_sigsetmask (sigset_t new_mask)
2654 {
2655 sigset_t old_mask;
2656 sigprocmask (SIG_SETMASK, &new_mask, &old_mask);
2657 return (old_mask);
2658 }
2659
2660 #endif /* POSIX_SIGNALS */
2661 \f
2662 #ifndef HAVE_RANDOM
2663 #ifdef random
2664 #define HAVE_RANDOM
2665 #endif
2666 #endif
2667
2668 /* Figure out how many bits the system's random number generator uses.
2669 `random' and `lrand48' are assumed to return 31 usable bits.
2670 BSD `rand' returns a 31 bit value but the low order bits are unusable;
2671 so we'll shift it and treat it like the 15-bit USG `rand'. */
2672
2673 #ifndef RAND_BITS
2674 # ifdef HAVE_RANDOM
2675 # define RAND_BITS 31
2676 # else /* !HAVE_RANDOM */
2677 # ifdef HAVE_LRAND48
2678 # define RAND_BITS 31
2679 # define random lrand48
2680 # else /* !HAVE_LRAND48 */
2681 # define RAND_BITS 15
2682 # if RAND_MAX == 32767
2683 # define random rand
2684 # else /* RAND_MAX != 32767 */
2685 # if RAND_MAX == 2147483647
2686 # define random() (rand () >> 16)
2687 # else /* RAND_MAX != 2147483647 */
2688 # ifdef USG
2689 # define random rand
2690 # else
2691 # define random() (rand () >> 16)
2692 # endif /* !BSD */
2693 # endif /* RAND_MAX != 2147483647 */
2694 # endif /* RAND_MAX != 32767 */
2695 # endif /* !HAVE_LRAND48 */
2696 # endif /* !HAVE_RANDOM */
2697 #endif /* !RAND_BITS */
2698
2699 void
2700 seed_random (arg)
2701 long arg;
2702 {
2703 #ifdef HAVE_RANDOM
2704 srandom ((unsigned int)arg);
2705 #else
2706 # ifdef HAVE_LRAND48
2707 srand48 (arg);
2708 # else
2709 srand ((unsigned int)arg);
2710 # endif
2711 #endif
2712 }
2713
2714 /*
2715 * Build a full Emacs-sized word out of whatever we've got.
2716 * This suffices even for a 64-bit architecture with a 15-bit rand.
2717 */
2718 long
2719 get_random ()
2720 {
2721 long val = random ();
2722 #if VALBITS > RAND_BITS
2723 val = (val << RAND_BITS) ^ random ();
2724 #if VALBITS > 2*RAND_BITS
2725 val = (val << RAND_BITS) ^ random ();
2726 #if VALBITS > 3*RAND_BITS
2727 val = (val << RAND_BITS) ^ random ();
2728 #if VALBITS > 4*RAND_BITS
2729 val = (val << RAND_BITS) ^ random ();
2730 #endif /* need at least 5 */
2731 #endif /* need at least 4 */
2732 #endif /* need at least 3 */
2733 #endif /* need at least 2 */
2734 return val & ((1L << VALBITS) - 1);
2735 }
2736 \f
2737 #ifdef WRONG_NAME_INSQUE
2738
2739 insque (q,p)
2740 caddr_t q,p;
2741 {
2742 _insque (q,p);
2743 }
2744
2745 #endif
2746 \f
2747 #ifdef VMS
2748
2749 #ifdef getenv
2750 /* If any place else asks for the TERM variable,
2751 allow it to be overridden with the EMACS_TERM variable
2752 before attempting to translate the logical name TERM. As a last
2753 resort, ask for VAX C's special idea of the TERM variable. */
2754 #undef getenv
2755 char *
2756 sys_getenv (name)
2757 char *name;
2758 {
2759 register char *val;
2760 static char buf[256];
2761 static struct dsc$descriptor_s equiv
2762 = {sizeof (buf), DSC$K_DTYPE_T, DSC$K_CLASS_S, buf};
2763 static struct dsc$descriptor_s d_name
2764 = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0};
2765 short eqlen;
2766
2767 if (!strcmp (name, "TERM"))
2768 {
2769 val = (char *) getenv ("EMACS_TERM");
2770 if (val)
2771 return val;
2772 }
2773
2774 d_name.dsc$w_length = strlen (name);
2775 d_name.dsc$a_pointer = name;
2776 if (LIB$SYS_TRNLOG (&d_name, &eqlen, &equiv) == 1)
2777 {
2778 char *str = (char *) xmalloc (eqlen + 1);
2779 bcopy (buf, str, eqlen);
2780 str[eqlen] = '\0';
2781 /* This is a storage leak, but a pain to fix. With luck,
2782 no one will ever notice. */
2783 return str;
2784 }
2785 return (char *) getenv (name);
2786 }
2787 #endif /* getenv */
2788
2789 #ifdef abort
2790 /* Since VMS doesn't believe in core dumps, the only way to debug this beast is
2791 to force a call on the debugger from within the image. */
2792 #undef abort
2793 sys_abort ()
2794 {
2795 reset_sys_modes ();
2796 LIB$SIGNAL (SS$_DEBUG);
2797 }
2798 #endif /* abort */
2799 #endif /* VMS */
2800 \f
2801 #ifdef VMS
2802 #ifdef LINK_CRTL_SHARE
2803 #ifdef SHARABLE_LIB_BUG
2804 /* Variables declared noshare and initialized in sharable libraries
2805 cannot be shared. The VMS linker incorrectly forces you to use a private
2806 version which is uninitialized... If not for this "feature", we
2807 could use the C library definition of sys_nerr and sys_errlist. */
2808 int sys_nerr = 35;
2809 char *sys_errlist[] =
2810 {
2811 "error 0",
2812 "not owner",
2813 "no such file or directory",
2814 "no such process",
2815 "interrupted system call",
2816 "i/o error",
2817 "no such device or address",
2818 "argument list too long",
2819 "exec format error",
2820 "bad file number",
2821 "no child process",
2822 "no more processes",
2823 "not enough memory",
2824 "permission denied",
2825 "bad address",
2826 "block device required",
2827 "mount devices busy",
2828 "file exists",
2829 "cross-device link",
2830 "no such device",
2831 "not a directory",
2832 "is a directory",
2833 "invalid argument",
2834 "file table overflow",
2835 "too many open files",
2836 "not a typewriter",
2837 "text file busy",
2838 "file too big",
2839 "no space left on device",
2840 "illegal seek",
2841 "read-only file system",
2842 "too many links",
2843 "broken pipe",
2844 "math argument",
2845 "result too large",
2846 "I/O stream empty",
2847 "vax/vms specific error code nontranslatable error"
2848 };
2849 #endif /* SHARABLE_LIB_BUG */
2850 #endif /* LINK_CRTL_SHARE */
2851 #endif /* VMS */
2852
2853 #ifndef HAVE_STRERROR
2854 #ifndef WINDOWSNT
2855 char *
2856 strerror (errnum)
2857 int errnum;
2858 {
2859 extern char *sys_errlist[];
2860 extern int sys_nerr;
2861
2862 if (errnum >= 0 && errnum < sys_nerr)
2863 return sys_errlist[errnum];
2864 return (char *) "Unknown error";
2865 }
2866 #endif /* not WINDOWSNT */
2867 #endif /* ! HAVE_STRERROR */
2868 \f
2869 #ifdef INTERRUPTIBLE_OPEN
2870
2871 int
2872 /* VARARGS 2 */
2873 sys_open (path, oflag, mode)
2874 char *path;
2875 int oflag, mode;
2876 {
2877 register int rtnval;
2878
2879 while ((rtnval = open (path, oflag, mode)) == -1
2880 && (errno == EINTR));
2881 return (rtnval);
2882 }
2883
2884 #endif /* INTERRUPTIBLE_OPEN */
2885
2886 #ifdef INTERRUPTIBLE_CLOSE
2887
2888 sys_close (fd)
2889 int fd;
2890 {
2891 int did_retry = 0;
2892 register int rtnval;
2893
2894 while ((rtnval = close (fd)) == -1
2895 && (errno == EINTR))
2896 did_retry = 1;
2897
2898 /* If close is interrupted SunOS 4.1 may or may not have closed the
2899 file descriptor. If it did the second close will fail with
2900 errno = EBADF. That means we have succeeded. */
2901 if (rtnval == -1 && did_retry && errno == EBADF)
2902 return 0;
2903
2904 return rtnval;
2905 }
2906
2907 #endif /* INTERRUPTIBLE_CLOSE */
2908
2909 #ifdef INTERRUPTIBLE_IO
2910
2911 int
2912 sys_read (fildes, buf, nbyte)
2913 int fildes;
2914 char *buf;
2915 unsigned int nbyte;
2916 {
2917 register int rtnval;
2918
2919 while ((rtnval = read (fildes, buf, nbyte)) == -1
2920 && (errno == EINTR));
2921 return (rtnval);
2922 }
2923
2924 int
2925 sys_write (fildes, buf, nbyte)
2926 int fildes;
2927 char *buf;
2928 unsigned int nbyte;
2929 {
2930 register int rtnval, bytes_written;
2931
2932 bytes_written = 0;
2933
2934 while (nbyte > 0)
2935 {
2936 rtnval = write (fildes, buf, nbyte);
2937
2938 if (rtnval == -1)
2939 {
2940 if (errno == EINTR)
2941 continue;
2942 else
2943 return (bytes_written ? bytes_written : -1);
2944 }
2945
2946 buf += rtnval;
2947 nbyte -= rtnval;
2948 bytes_written += rtnval;
2949 }
2950 return (bytes_written);
2951 }
2952
2953 #endif /* INTERRUPTIBLE_IO */
2954 \f
2955 #ifndef HAVE_VFORK
2956 #ifndef WINDOWSNT
2957 /*
2958 * Substitute fork for vfork on USG flavors.
2959 */
2960
2961 VFORK_RETURN_TYPE
2962 vfork ()
2963 {
2964 return (fork ());
2965 }
2966 #endif /* not WINDOWSNT */
2967 #endif /* not HAVE_VFORK */
2968 \f
2969 #ifdef USG
2970 /*
2971 * All of the following are for USG.
2972 *
2973 * On USG systems the system calls are INTERRUPTIBLE by signals
2974 * that the user program has elected to catch. Thus the system call
2975 * must be retried in these cases. To handle this without massive
2976 * changes in the source code, we remap the standard system call names
2977 * to names for our own functions in sysdep.c that do the system call
2978 * with retries. Actually, for portability reasons, it is good
2979 * programming practice, as this example shows, to limit all actual
2980 * system calls to a single occurrence in the source. Sure, this
2981 * adds an extra level of function call overhead but it is almost
2982 * always negligible. Fred Fish, Unisoft Systems Inc.
2983 */
2984
2985 #ifndef HAVE_SYS_SIGLIST
2986 char *sys_siglist[NSIG + 1] =
2987 {
2988 #ifdef AIX
2989 /* AIX has changed the signals a bit */
2990 "bogus signal", /* 0 */
2991 "hangup", /* 1 SIGHUP */
2992 "interrupt", /* 2 SIGINT */
2993 "quit", /* 3 SIGQUIT */
2994 "illegal instruction", /* 4 SIGILL */
2995 "trace trap", /* 5 SIGTRAP */
2996 "IOT instruction", /* 6 SIGIOT */
2997 "crash likely", /* 7 SIGDANGER */
2998 "floating point exception", /* 8 SIGFPE */
2999 "kill", /* 9 SIGKILL */
3000 "bus error", /* 10 SIGBUS */
3001 "segmentation violation", /* 11 SIGSEGV */
3002 "bad argument to system call", /* 12 SIGSYS */
3003 "write on a pipe with no one to read it", /* 13 SIGPIPE */
3004 "alarm clock", /* 14 SIGALRM */
3005 "software termination signum", /* 15 SIGTERM */
3006 "user defined signal 1", /* 16 SIGUSR1 */
3007 "user defined signal 2", /* 17 SIGUSR2 */
3008 "death of a child", /* 18 SIGCLD */
3009 "power-fail restart", /* 19 SIGPWR */
3010 "bogus signal", /* 20 */
3011 "bogus signal", /* 21 */
3012 "bogus signal", /* 22 */
3013 "bogus signal", /* 23 */
3014 "bogus signal", /* 24 */
3015 "LAN I/O interrupt", /* 25 SIGAIO */
3016 "PTY I/O interrupt", /* 26 SIGPTY */
3017 "I/O intervention required", /* 27 SIGIOINT */
3018 #ifdef AIXHFT
3019 "HFT grant", /* 28 SIGGRANT */
3020 "HFT retract", /* 29 SIGRETRACT */
3021 "HFT sound done", /* 30 SIGSOUND */
3022 "HFT input ready", /* 31 SIGMSG */
3023 #endif
3024 #else /* not AIX */
3025 "bogus signal", /* 0 */
3026 "hangup", /* 1 SIGHUP */
3027 "interrupt", /* 2 SIGINT */
3028 "quit", /* 3 SIGQUIT */
3029 "illegal instruction", /* 4 SIGILL */
3030 "trace trap", /* 5 SIGTRAP */
3031 "IOT instruction", /* 6 SIGIOT */
3032 "EMT instruction", /* 7 SIGEMT */
3033 "floating point exception", /* 8 SIGFPE */
3034 "kill", /* 9 SIGKILL */
3035 "bus error", /* 10 SIGBUS */
3036 "segmentation violation", /* 11 SIGSEGV */
3037 "bad argument to system call", /* 12 SIGSYS */
3038 "write on a pipe with no one to read it", /* 13 SIGPIPE */
3039 "alarm clock", /* 14 SIGALRM */
3040 "software termination signum", /* 15 SIGTERM */
3041 "user defined signal 1", /* 16 SIGUSR1 */
3042 "user defined signal 2", /* 17 SIGUSR2 */
3043 "death of a child", /* 18 SIGCLD */
3044 "power-fail restart", /* 19 SIGPWR */
3045 #ifdef sun
3046 "window size change", /* 20 SIGWINCH */
3047 "urgent socket condition", /* 21 SIGURG */
3048 "pollable event occurred", /* 22 SIGPOLL */
3049 "stop (cannot be caught or ignored)", /* 23 SIGSTOP */
3050 "user stop requested from tty", /* 24 SIGTSTP */
3051 "stopped process has been continued", /* 25 SIGCONT */
3052 "background tty read attempted", /* 26 SIGTTIN */
3053 "background tty write attempted", /* 27 SIGTTOU */
3054 "virtual timer expired", /* 28 SIGVTALRM */
3055 "profiling timer expired", /* 29 SIGPROF */
3056 "exceeded cpu limit", /* 30 SIGXCPU */
3057 "exceeded file size limit", /* 31 SIGXFSZ */
3058 "process's lwps are blocked", /* 32 SIGWAITING */
3059 "special signal used by thread library", /* 33 SIGLWP */
3060 #ifdef SIGFREEZE
3061 "Special Signal Used By CPR", /* 34 SIGFREEZE */
3062 #endif
3063 #ifdef SIGTHAW
3064 "Special Signal Used By CPR", /* 35 SIGTHAW */
3065 #endif
3066 #endif /* sun */
3067 #endif /* not AIX */
3068 0
3069 };
3070 #endif /* HAVE_SYS_SIGLIST */
3071
3072 /*
3073 * Warning, this function may not duplicate 4.2 action properly
3074 * under error conditions.
3075 */
3076
3077 #ifndef MAXPATHLEN
3078 /* In 4.1, param.h fails to define this. */
3079 #define MAXPATHLEN 1024
3080 #endif
3081
3082 #ifndef HAVE_GETWD
3083
3084 char *
3085 getwd (pathname)
3086 char *pathname;
3087 {
3088 char *npath, *spath;
3089 extern char *getcwd ();
3090
3091 BLOCK_INPUT; /* getcwd uses malloc */
3092 spath = npath = getcwd ((char *) 0, MAXPATHLEN);
3093 if (spath == 0)
3094 return spath;
3095 /* On Altos 3068, getcwd can return @hostname/dir, so discard
3096 up to first slash. Should be harmless on other systems. */
3097 while (*npath && *npath != '/')
3098 npath++;
3099 strcpy (pathname, npath);
3100 free (spath); /* getcwd uses malloc */
3101 UNBLOCK_INPUT;
3102 return pathname;
3103 }
3104
3105 #endif /* HAVE_GETWD */
3106
3107 /*
3108 * Emulate rename using unlink/link. Note that this is
3109 * only partially correct. Also, doesn't enforce restriction
3110 * that files be of same type (regular->regular, dir->dir, etc).
3111 */
3112
3113 #ifndef HAVE_RENAME
3114
3115 rename (from, to)
3116 const char *from;
3117 const char *to;
3118 {
3119 if (access (from, 0) == 0)
3120 {
3121 unlink (to);
3122 if (link (from, to) == 0)
3123 if (unlink (from) == 0)
3124 return (0);
3125 }
3126 return (-1);
3127 }
3128
3129 #endif
3130
3131
3132 #ifdef HPUX
3133 #ifndef HAVE_PERROR
3134
3135 /* HPUX curses library references perror, but as far as we know
3136 it won't be called. Anyway this definition will do for now. */
3137
3138 perror ()
3139 {
3140 }
3141
3142 #endif /* not HAVE_PERROR */
3143 #endif /* HPUX */
3144
3145 #ifndef HAVE_DUP2
3146
3147 /*
3148 * Emulate BSD dup2. First close newd if it already exists.
3149 * Then, attempt to dup oldd. If not successful, call dup2 recursively
3150 * until we are, then close the unsuccessful ones.
3151 */
3152
3153 dup2 (oldd, newd)
3154 int oldd;
3155 int newd;
3156 {
3157 register int fd, ret;
3158
3159 sys_close (newd);
3160
3161 #ifdef F_DUPFD
3162 fd = fcntl (oldd, F_DUPFD, newd);
3163 if (fd != newd)
3164 error ("can't dup2 (%i,%i) : %s", oldd, newd, strerror (errno));
3165 #else
3166 fd = dup (old);
3167 if (fd == -1)
3168 return -1;
3169 if (fd == new)
3170 return new;
3171 ret = dup2 (old,new);
3172 sys_close (fd);
3173 return ret;
3174 #endif
3175 }
3176
3177 #endif /* not HAVE_DUP2 */
3178
3179 /*
3180 * Gettimeofday. Simulate as much as possible. Only accurate
3181 * to nearest second. Emacs doesn't use tzp so ignore it for now.
3182 * Only needed when subprocesses are defined.
3183 */
3184
3185 #ifdef subprocesses
3186 #ifndef VMS
3187 #ifndef HAVE_GETTIMEOFDAY
3188 #ifdef HAVE_TIMEVAL
3189
3190 /* ARGSUSED */
3191 gettimeofday (tp, tzp)
3192 struct timeval *tp;
3193 struct timezone *tzp;
3194 {
3195 extern long time ();
3196
3197 tp->tv_sec = time ((long *)0);
3198 tp->tv_usec = 0;
3199 if (tzp != 0)
3200 tzp->tz_minuteswest = -1;
3201 }
3202
3203 #endif
3204 #endif
3205 #endif
3206 #endif /* subprocess && !HAVE_GETTIMEOFDAY && HAVE_TIMEVAL && !VMS */
3207
3208 /*
3209 * This function will go away as soon as all the stubs fixed. (fnf)
3210 */
3211
3212 croak (badfunc)
3213 char *badfunc;
3214 {
3215 printf ("%s not yet implemented\r\n", badfunc);
3216 reset_sys_modes ();
3217 exit (1);
3218 }
3219
3220 #endif /* USG */
3221 \f
3222 #ifdef DGUX
3223
3224 char *sys_siglist[NSIG + 1] =
3225 {
3226 "null signal", /* 0 SIGNULL */
3227 "hangup", /* 1 SIGHUP */
3228 "interrupt", /* 2 SIGINT */
3229 "quit", /* 3 SIGQUIT */
3230 "illegal instruction", /* 4 SIGILL */
3231 "trace trap", /* 5 SIGTRAP */
3232 "abort termination", /* 6 SIGABRT */
3233 "SIGEMT", /* 7 SIGEMT */
3234 "floating point exception", /* 8 SIGFPE */
3235 "kill", /* 9 SIGKILL */
3236 "bus error", /* 10 SIGBUS */
3237 "segmentation violation", /* 11 SIGSEGV */
3238 "bad argument to system call", /* 12 SIGSYS */
3239 "write on a pipe with no reader", /* 13 SIGPIPE */
3240 "alarm clock", /* 14 SIGALRM */
3241 "software termination signal", /* 15 SIGTERM */
3242 "user defined signal 1", /* 16 SIGUSR1 */
3243 "user defined signal 2", /* 17 SIGUSR2 */
3244 "child stopped or terminated", /* 18 SIGCLD */
3245 "power-fail restart", /* 19 SIGPWR */
3246 "window size changed", /* 20 SIGWINCH */
3247 "undefined", /* 21 */
3248 "pollable event occurred", /* 22 SIGPOLL */
3249 "sendable stop signal not from tty", /* 23 SIGSTOP */
3250 "stop signal from tty", /* 24 SIGSTP */
3251 "continue a stopped process", /* 25 SIGCONT */
3252 "attempted background tty read", /* 26 SIGTTIN */
3253 "attempted background tty write", /* 27 SIGTTOU */
3254 "undefined", /* 28 */
3255 "undefined", /* 29 */
3256 "undefined", /* 30 */
3257 "undefined", /* 31 */
3258 "undefined", /* 32 */
3259 "socket (TCP/IP) urgent data arrival", /* 33 SIGURG */
3260 "I/O is possible", /* 34 SIGIO */
3261 "exceeded cpu time limit", /* 35 SIGXCPU */
3262 "exceeded file size limit", /* 36 SIGXFSZ */
3263 "virtual time alarm", /* 37 SIGVTALRM */
3264 "profiling time alarm", /* 38 SIGPROF */
3265 "undefined", /* 39 */
3266 "file record locks revoked", /* 40 SIGLOST */
3267 "undefined", /* 41 */
3268 "undefined", /* 42 */
3269 "undefined", /* 43 */
3270 "undefined", /* 44 */
3271 "undefined", /* 45 */
3272 "undefined", /* 46 */
3273 "undefined", /* 47 */
3274 "undefined", /* 48 */
3275 "undefined", /* 49 */
3276 "undefined", /* 50 */
3277 "undefined", /* 51 */
3278 "undefined", /* 52 */
3279 "undefined", /* 53 */
3280 "undefined", /* 54 */
3281 "undefined", /* 55 */
3282 "undefined", /* 56 */
3283 "undefined", /* 57 */
3284 "undefined", /* 58 */
3285 "undefined", /* 59 */
3286 "undefined", /* 60 */
3287 "undefined", /* 61 */
3288 "undefined", /* 62 */
3289 "undefined", /* 63 */
3290 "notification message in mess. queue", /* 64 SIGDGNOTIFY */
3291 0
3292 };
3293
3294 #endif /* DGUX */
3295 \f
3296 /* Directory routines for systems that don't have them. */
3297
3298 #ifdef SYSV_SYSTEM_DIR
3299
3300 #include <dirent.h>
3301
3302 #if defined(BROKEN_CLOSEDIR) || !defined(HAVE_CLOSEDIR)
3303
3304 int
3305 closedir (dirp)
3306 register DIR *dirp; /* stream from opendir */
3307 {
3308 int rtnval;
3309
3310 rtnval = sys_close (dirp->dd_fd);
3311
3312 /* Some systems (like Solaris) allocate the buffer and the DIR all
3313 in one block. Why in the world are we freeing this ourselves
3314 anyway? */
3315 #if ! (defined (sun) && defined (USG5_4))
3316 xfree ((char *) dirp->dd_buf); /* directory block defined in <dirent.h> */
3317 #endif
3318 xfree ((char *) dirp);
3319
3320 return rtnval;
3321 }
3322 #endif /* BROKEN_CLOSEDIR or not HAVE_CLOSEDIR */
3323 #endif /* SYSV_SYSTEM_DIR */
3324
3325 #ifdef NONSYSTEM_DIR_LIBRARY
3326
3327 DIR *
3328 opendir (filename)
3329 char *filename; /* name of directory */
3330 {
3331 register DIR *dirp; /* -> malloc'ed storage */
3332 register int fd; /* file descriptor for read */
3333 struct stat sbuf; /* result of fstat */
3334
3335 fd = sys_open (filename, 0);
3336 if (fd < 0)
3337 return 0;
3338
3339 BLOCK_INPUT;
3340 if (fstat (fd, &sbuf) < 0
3341 || (sbuf.st_mode & S_IFMT) != S_IFDIR
3342 || (dirp = (DIR *) malloc (sizeof (DIR))) == 0)
3343 {
3344 sys_close (fd);
3345 UNBLOCK_INPUT;
3346 return 0; /* bad luck today */
3347 }
3348 UNBLOCK_INPUT;
3349
3350 dirp->dd_fd = fd;
3351 dirp->dd_loc = dirp->dd_size = 0; /* refill needed */
3352
3353 return dirp;
3354 }
3355
3356 void
3357 closedir (dirp)
3358 register DIR *dirp; /* stream from opendir */
3359 {
3360 sys_close (dirp->dd_fd);
3361 xfree ((char *) dirp);
3362 }
3363
3364
3365 #ifndef VMS
3366 #define DIRSIZ 14
3367 struct olddir
3368 {
3369 ino_t od_ino; /* inode */
3370 char od_name[DIRSIZ]; /* filename */
3371 };
3372 #endif /* not VMS */
3373
3374 struct direct dir_static; /* simulated directory contents */
3375
3376 /* ARGUSED */
3377 struct direct *
3378 readdir (dirp)
3379 register DIR *dirp; /* stream from opendir */
3380 {
3381 #ifndef VMS
3382 register struct olddir *dp; /* -> directory data */
3383 #else /* VMS */
3384 register struct dir$_name *dp; /* -> directory data */
3385 register struct dir$_version *dv; /* -> version data */
3386 #endif /* VMS */
3387
3388 for (; ;)
3389 {
3390 if (dirp->dd_loc >= dirp->dd_size)
3391 dirp->dd_loc = dirp->dd_size = 0;
3392
3393 if (dirp->dd_size == 0 /* refill buffer */
3394 && (dirp->dd_size = sys_read (dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
3395 return 0;
3396
3397 #ifndef VMS
3398 dp = (struct olddir *) &dirp->dd_buf[dirp->dd_loc];
3399 dirp->dd_loc += sizeof (struct olddir);
3400
3401 if (dp->od_ino != 0) /* not deleted entry */
3402 {
3403 dir_static.d_ino = dp->od_ino;
3404 strncpy (dir_static.d_name, dp->od_name, DIRSIZ);
3405 dir_static.d_name[DIRSIZ] = '\0';
3406 dir_static.d_namlen = strlen (dir_static.d_name);
3407 dir_static.d_reclen = sizeof (struct direct)
3408 - MAXNAMLEN + 3
3409 + dir_static.d_namlen - dir_static.d_namlen % 4;
3410 return &dir_static; /* -> simulated structure */
3411 }
3412 #else /* VMS */
3413 dp = (struct dir$_name *) dirp->dd_buf;
3414 if (dirp->dd_loc == 0)
3415 dirp->dd_loc = (dp->dir$b_namecount&1) ? dp->dir$b_namecount + 1
3416 : dp->dir$b_namecount;
3417 dv = (struct dir$_version *)&dp->dir$t_name[dirp->dd_loc];
3418 dir_static.d_ino = dv->dir$w_fid_num;
3419 dir_static.d_namlen = dp->dir$b_namecount;
3420 dir_static.d_reclen = sizeof (struct direct)
3421 - MAXNAMLEN + 3
3422 + dir_static.d_namlen - dir_static.d_namlen % 4;
3423 strncpy (dir_static.d_name, dp->dir$t_name, dp->dir$b_namecount);
3424 dir_static.d_name[dir_static.d_namlen] = '\0';
3425 dirp->dd_loc = dirp->dd_size; /* only one record at a time */
3426 return &dir_static;
3427 #endif /* VMS */
3428 }
3429 }
3430
3431 #ifdef VMS
3432 /* readdirver is just like readdir except it returns all versions of a file
3433 as separate entries. */
3434
3435 /* ARGUSED */
3436 struct direct *
3437 readdirver (dirp)
3438 register DIR *dirp; /* stream from opendir */
3439 {
3440 register struct dir$_name *dp; /* -> directory data */
3441 register struct dir$_version *dv; /* -> version data */
3442
3443 if (dirp->dd_loc >= dirp->dd_size - sizeof (struct dir$_name))
3444 dirp->dd_loc = dirp->dd_size = 0;
3445
3446 if (dirp->dd_size == 0 /* refill buffer */
3447 && (dirp->dd_size = sys_read (dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
3448 return 0;
3449
3450 dp = (struct dir$_name *) dirp->dd_buf;
3451 if (dirp->dd_loc == 0)
3452 dirp->dd_loc = (dp->dir$b_namecount & 1) ? dp->dir$b_namecount + 1
3453 : dp->dir$b_namecount;
3454 dv = (struct dir$_version *) &dp->dir$t_name[dirp->dd_loc];
3455 strncpy (dir_static.d_name, dp->dir$t_name, dp->dir$b_namecount);
3456 sprintf (&dir_static.d_name[dp->dir$b_namecount], ";%d", dv->dir$w_version);
3457 dir_static.d_namlen = strlen (dir_static.d_name);
3458 dir_static.d_ino = dv->dir$w_fid_num;
3459 dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3
3460 + dir_static.d_namlen - dir_static.d_namlen % 4;
3461 dirp->dd_loc = ((char *) (++dv) - dp->dir$t_name);
3462 return &dir_static;
3463 }
3464
3465 #endif /* VMS */
3466
3467 #endif /* NONSYSTEM_DIR_LIBRARY */
3468
3469 \f
3470 int
3471 set_file_times (filename, atime, mtime)
3472 char *filename;
3473 EMACS_TIME atime, mtime;
3474 {
3475 #ifdef HAVE_UTIMES
3476 struct timeval tv[2];
3477 tv[0] = atime;
3478 tv[1] = mtime;
3479 return utimes (filename, tv);
3480 #else /* not HAVE_UTIMES */
3481 struct utimbuf utb;
3482 utb.actime = EMACS_SECS (atime);
3483 utb.modtime = EMACS_SECS (mtime);
3484 return utime (filename, &utb);
3485 #endif /* not HAVE_UTIMES */
3486 }
3487 \f
3488 /* mkdir and rmdir functions, for systems which don't have them. */
3489
3490 #ifndef HAVE_MKDIR
3491 /*
3492 * Written by Robert Rother, Mariah Corporation, August 1985.
3493 *
3494 * If you want it, it's yours. All I ask in return is that if you
3495 * figure out how to do this in a Bourne Shell script you send me
3496 * a copy.
3497 * sdcsvax!rmr or rmr@uscd
3498 *
3499 * Severely hacked over by John Gilmore to make a 4.2BSD compatible
3500 * subroutine. 11Mar86; hoptoad!gnu
3501 *
3502 * Modified by rmtodd@uokmax 6-28-87 -- when making an already existing dir,
3503 * subroutine didn't return EEXIST. It does now.
3504 */
3505
3506 /*
3507 * Make a directory.
3508 */
3509 #ifdef MKDIR_PROTOTYPE
3510 MKDIR_PROTOTYPE
3511 #else
3512 int
3513 mkdir (dpath, dmode)
3514 char *dpath;
3515 int dmode;
3516 #endif
3517 {
3518 int cpid, status, fd;
3519 struct stat statbuf;
3520
3521 if (stat (dpath, &statbuf) == 0)
3522 {
3523 errno = EEXIST; /* Stat worked, so it already exists */
3524 return -1;
3525 }
3526
3527 /* If stat fails for a reason other than non-existence, return error */
3528 if (errno != ENOENT)
3529 return -1;
3530
3531 synch_process_alive = 1;
3532 switch (cpid = fork ())
3533 {
3534
3535 case -1: /* Error in fork */
3536 return (-1); /* Errno is set already */
3537
3538 case 0: /* Child process */
3539 /*
3540 * Cheap hack to set mode of new directory. Since this
3541 * child process is going away anyway, we zap its umask.
3542 * FIXME, this won't suffice to set SUID, SGID, etc. on this
3543 * directory. Does anybody care?
3544 */
3545 status = umask (0); /* Get current umask */
3546 status = umask (status | (0777 & ~dmode)); /* Set for mkdir */
3547 fd = sys_open("/dev/null", 2);
3548 if (fd >= 0)
3549 {
3550 dup2 (fd, 0);
3551 dup2 (fd, 1);
3552 dup2 (fd, 2);
3553 }
3554 execl ("/bin/mkdir", "mkdir", dpath, (char *) 0);
3555 _exit (-1); /* Can't exec /bin/mkdir */
3556
3557 default: /* Parent process */
3558 wait_for_termination (cpid);
3559 }
3560
3561 if (synch_process_death != 0 || synch_process_retcode != 0)
3562 {
3563 errno = EIO; /* We don't know why, but */
3564 return -1; /* /bin/mkdir failed */
3565 }
3566
3567 return 0;
3568 }
3569 #endif /* not HAVE_MKDIR */
3570
3571 #ifndef HAVE_RMDIR
3572 int
3573 rmdir (dpath)
3574 char *dpath;
3575 {
3576 int cpid, status, fd;
3577 struct stat statbuf;
3578
3579 if (stat (dpath, &statbuf) != 0)
3580 {
3581 /* Stat just set errno. We don't have to */
3582 return -1;
3583 }
3584
3585 synch_process_alive = 1;
3586 switch (cpid = fork ())
3587 {
3588
3589 case -1: /* Error in fork */
3590 return (-1); /* Errno is set already */
3591
3592 case 0: /* Child process */
3593 fd = sys_open("/dev/null", 2);
3594 if (fd >= 0)
3595 {
3596 dup2 (fd, 0);
3597 dup2 (fd, 1);
3598 dup2 (fd, 2);
3599 }
3600 execl ("/bin/rmdir", "rmdir", dpath, (char *) 0);
3601 _exit (-1); /* Can't exec /bin/rmdir */
3602
3603 default: /* Parent process */
3604 wait_for_termination (cpid);
3605 }
3606
3607 if (synch_process_death != 0 || synch_process_retcode != 0)
3608 {
3609 errno = EIO; /* We don't know why, but */
3610 return -1; /* /bin/rmdir failed */
3611 }
3612
3613 return 0;
3614 }
3615 #endif /* !HAVE_RMDIR */
3616
3617
3618 \f
3619 /* Functions for VMS */
3620 #ifdef VMS
3621 #include "vms-pwd.h"
3622 #include <acldef.h>
3623 #include <chpdef.h>
3624 #include <jpidef.h>
3625
3626 /* Return as a string the VMS error string pertaining to STATUS.
3627 Reuses the same static buffer each time it is called. */
3628
3629 char *
3630 vmserrstr (status)
3631 int status; /* VMS status code */
3632 {
3633 int bufadr[2];
3634 short len;
3635 static char buf[257];
3636
3637 bufadr[0] = sizeof buf - 1;
3638 bufadr[1] = (int) buf;
3639 if (! (SYS$GETMSG (status, &len, bufadr, 0x1, 0) & 1))
3640 return "untranslatable VMS error status";
3641 buf[len] = '\0';
3642 return buf;
3643 }
3644
3645 #ifdef access
3646 #undef access
3647
3648 /* The following is necessary because 'access' emulation by VMS C (2.0) does
3649 * not work correctly. (It also doesn't work well in version 2.3.)
3650 */
3651
3652 #ifdef VMS4_4
3653
3654 #define DESCRIPTOR(name,string) struct dsc$descriptor_s name = \
3655 { strlen (string), DSC$K_DTYPE_T, DSC$K_CLASS_S, string }
3656
3657 typedef union {
3658 struct {
3659 unsigned short s_buflen;
3660 unsigned short s_code;
3661 char *s_bufadr;
3662 unsigned short *s_retlenadr;
3663 } s;
3664 int end;
3665 } item;
3666 #define buflen s.s_buflen
3667 #define code s.s_code
3668 #define bufadr s.s_bufadr
3669 #define retlenadr s.s_retlenadr
3670
3671 #define R_OK 4 /* test for read permission */
3672 #define W_OK 2 /* test for write permission */
3673 #define X_OK 1 /* test for execute (search) permission */
3674 #define F_OK 0 /* test for presence of file */
3675
3676 int
3677 sys_access (path, mode)
3678 char *path;
3679 int mode;
3680 {
3681 static char *user = NULL;
3682 char dir_fn[512];
3683
3684 /* translate possible directory spec into .DIR file name, so brain-dead
3685 * access can treat the directory like a file. */
3686 if (directory_file_name (path, dir_fn))
3687 path = dir_fn;
3688
3689 if (mode == F_OK)
3690 return access (path, mode);
3691 if (user == NULL && (user = (char *) getenv ("USER")) == NULL)
3692 return -1;
3693 {
3694 int stat;
3695 int flags;
3696 int acces;
3697 unsigned short int dummy;
3698 item itemlst[3];
3699 static int constant = ACL$C_FILE;
3700 DESCRIPTOR (path_desc, path);
3701 DESCRIPTOR (user_desc, user);
3702
3703 flags = 0;
3704 acces = 0;
3705 if ((mode & X_OK) && ((stat = access (path, mode)) < 0 || mode == X_OK))
3706 return stat;
3707 if (mode & R_OK)
3708 acces |= CHP$M_READ;
3709 if (mode & W_OK)
3710 acces |= CHP$M_WRITE;
3711 itemlst[0].buflen = sizeof (int);
3712 itemlst[0].code = CHP$_FLAGS;
3713 itemlst[0].bufadr = (char *) &flags;
3714 itemlst[0].retlenadr = &dummy;
3715 itemlst[1].buflen = sizeof (int);
3716 itemlst[1].code = CHP$_ACCESS;
3717 itemlst[1].bufadr = (char *) &acces;
3718 itemlst[1].retlenadr = &dummy;
3719 itemlst[2].end = CHP$_END;
3720 stat = SYS$CHECK_ACCESS (&constant, &path_desc, &user_desc, itemlst);
3721 return stat == SS$_NORMAL ? 0 : -1;
3722 }
3723 }
3724
3725 #else /* not VMS4_4 */
3726
3727 #include <prvdef.h>
3728 #define ACE$M_WRITE 2
3729 #define ACE$C_KEYID 1
3730
3731 static unsigned short memid, grpid;
3732 static unsigned int uic;
3733
3734 /* Called from init_sys_modes, so it happens not very often
3735 but at least each time Emacs is loaded. */
3736 sys_access_reinit ()
3737 {
3738 uic = 0;
3739 }
3740
3741 int
3742 sys_access (filename, type)
3743 char * filename;
3744 int type;
3745 {
3746 struct FAB fab;
3747 struct XABPRO xab;
3748 int status, size, i, typecode, acl_controlled;
3749 unsigned int *aclptr, *aclend, aclbuf[60];
3750 union prvdef prvmask;
3751
3752 /* Get UIC and GRP values for protection checking. */
3753 if (uic == 0)
3754 {
3755 status = LIB$GETJPI (&JPI$_UIC, 0, 0, &uic, 0, 0);
3756 if (! (status & 1))
3757 return -1;
3758 memid = uic & 0xFFFF;
3759 grpid = uic >> 16;
3760 }
3761
3762 if (type != 2) /* not checking write access */
3763 return access (filename, type);
3764
3765 /* Check write protection. */
3766
3767 #define CHECKPRIV(bit) (prvmask.bit)
3768 #define WRITABLE(field) (! ((xab.xab$w_pro >> field) & XAB$M_NOWRITE))
3769
3770 /* Find privilege bits */
3771 status = SYS$SETPRV (0, 0, 0, prvmask);
3772 if (! (status & 1))
3773 error ("Unable to find privileges: %s", vmserrstr (status));
3774 if (CHECKPRIV (PRV$V_BYPASS))
3775 return 0; /* BYPASS enabled */
3776 fab = cc$rms_fab;
3777 fab.fab$b_fac = FAB$M_GET;
3778 fab.fab$l_fna = filename;
3779 fab.fab$b_fns = strlen (filename);
3780 fab.fab$l_xab = &xab;
3781 xab = cc$rms_xabpro;
3782 xab.xab$l_aclbuf = aclbuf;
3783 xab.xab$w_aclsiz = sizeof (aclbuf);
3784 status = SYS$OPEN (&fab, 0, 0);
3785 if (! (status & 1))
3786 return -1;
3787 SYS$CLOSE (&fab, 0, 0);
3788 /* Check system access */
3789 if (CHECKPRIV (PRV$V_SYSPRV) && WRITABLE (XAB$V_SYS))
3790 return 0;
3791 /* Check ACL entries, if any */
3792 acl_controlled = 0;
3793 if (xab.xab$w_acllen > 0)
3794 {
3795 aclptr = aclbuf;
3796 aclend = &aclbuf[xab.xab$w_acllen / 4];
3797 while (*aclptr && aclptr < aclend)
3798 {
3799 size = (*aclptr & 0xff) / 4;
3800 typecode = (*aclptr >> 8) & 0xff;
3801 if (typecode == ACE$C_KEYID)
3802 for (i = size - 1; i > 1; i--)
3803 if (aclptr[i] == uic)
3804 {
3805 acl_controlled = 1;
3806 if (aclptr[1] & ACE$M_WRITE)
3807 return 0; /* Write access through ACL */
3808 }
3809 aclptr = &aclptr[size];
3810 }
3811 if (acl_controlled) /* ACL specified, prohibits write access */
3812 return -1;
3813 }
3814 /* No ACL entries specified, check normal protection */
3815 if (WRITABLE (XAB$V_WLD)) /* World writable */
3816 return 0;
3817 if (WRITABLE (XAB$V_GRP) &&
3818 (unsigned short) (xab.xab$l_uic >> 16) == grpid)
3819 return 0; /* Group writable */
3820 if (WRITABLE (XAB$V_OWN) &&
3821 (xab.xab$l_uic & 0xFFFF) == memid)
3822 return 0; /* Owner writable */
3823
3824 return -1; /* Not writable */
3825 }
3826 #endif /* not VMS4_4 */
3827 #endif /* access */
3828
3829 static char vtbuf[NAM$C_MAXRSS+1];
3830
3831 /* translate a vms file spec to a unix path */
3832 char *
3833 sys_translate_vms (vfile)
3834 char * vfile;
3835 {
3836 char * p;
3837 char * targ;
3838
3839 if (!vfile)
3840 return 0;
3841
3842 targ = vtbuf;
3843
3844 /* leading device or logical name is a root directory */
3845 if (p = strchr (vfile, ':'))
3846 {
3847 *targ++ = '/';
3848 while (vfile < p)
3849 *targ++ = *vfile++;
3850 vfile++;
3851 *targ++ = '/';
3852 }
3853 p = vfile;
3854 if (*p == '[' || *p == '<')
3855 {
3856 while (*++vfile != *p + 2)
3857 switch (*vfile)
3858 {
3859 case '.':
3860 if (vfile[-1] == *p)
3861 *targ++ = '.';
3862 *targ++ = '/';
3863 break;
3864
3865 case '-':
3866 *targ++ = '.';
3867 *targ++ = '.';
3868 break;
3869
3870 default:
3871 *targ++ = *vfile;
3872 break;
3873 }
3874 vfile++;
3875 *targ++ = '/';
3876 }
3877 while (*vfile)
3878 *targ++ = *vfile++;
3879
3880 return vtbuf;
3881 }
3882
3883 static char utbuf[NAM$C_MAXRSS+1];
3884
3885 /* translate a unix path to a VMS file spec */
3886 char *
3887 sys_translate_unix (ufile)
3888 char * ufile;
3889 {
3890 int slash_seen = 0;
3891 char *p;
3892 char * targ;
3893
3894 if (!ufile)
3895 return 0;
3896
3897 targ = utbuf;
3898
3899 if (*ufile == '/')
3900 {
3901 ufile++;
3902 }
3903
3904 while (*ufile)
3905 {
3906 switch (*ufile)
3907 {
3908 case '/':
3909 if (slash_seen)
3910 if (index (&ufile[1], '/'))
3911 *targ++ = '.';
3912 else
3913 *targ++ = ']';
3914 else
3915 {
3916 *targ++ = ':';
3917 if (index (&ufile[1], '/'))
3918 *targ++ = '[';
3919 slash_seen = 1;
3920 }
3921 break;
3922
3923 case '.':
3924 if (strncmp (ufile, "./", 2) == 0)
3925 {
3926 if (!slash_seen)
3927 {
3928 *targ++ = '[';
3929 slash_seen = 1;
3930 }
3931 ufile++; /* skip the dot */
3932 if (index (&ufile[1], '/'))
3933 *targ++ = '.';
3934 else
3935 *targ++ = ']';
3936 }
3937 else if (strncmp (ufile, "../", 3) == 0)
3938 {
3939 if (!slash_seen)
3940 {
3941 *targ++ = '[';
3942 slash_seen = 1;
3943 }
3944 *targ++ = '-';
3945 ufile += 2; /* skip the dots */
3946 if (index (&ufile[1], '/'))
3947 *targ++ = '.';
3948 else
3949 *targ++ = ']';
3950 }
3951 else
3952 *targ++ = *ufile;
3953 break;
3954
3955 default:
3956 *targ++ = *ufile;
3957 break;
3958 }
3959 ufile++;
3960 }
3961 *targ = '\0';
3962
3963 return utbuf;
3964 }
3965
3966 char *
3967 getwd (pathname)
3968 char *pathname;
3969 {
3970 char *ptr, *val;
3971 extern char *getcwd ();
3972
3973 #define MAXPATHLEN 1024
3974
3975 ptr = xmalloc (MAXPATHLEN);
3976 val = getcwd (ptr, MAXPATHLEN);
3977 if (val == 0)
3978 {
3979 xfree (ptr);
3980 return val;
3981 }
3982 strcpy (pathname, ptr);
3983 xfree (ptr);
3984
3985 return pathname;
3986 }
3987
3988 getppid ()
3989 {
3990 long item_code = JPI$_OWNER;
3991 unsigned long parent_id;
3992 int status;
3993
3994 if (((status = LIB$GETJPI (&item_code, 0, 0, &parent_id)) & 1) == 0)
3995 {
3996 errno = EVMSERR;
3997 vaxc$errno = status;
3998 return -1;
3999 }
4000 return parent_id;
4001 }
4002
4003 #undef getuid
4004 unsigned
4005 sys_getuid ()
4006 {
4007 return (getgid () << 16) | getuid ();
4008 }
4009
4010 int
4011 sys_read (fildes, buf, nbyte)
4012 int fildes;
4013 char *buf;
4014 unsigned int nbyte;
4015 {
4016 return read (fildes, buf, (nbyte < MAXIOSIZE ? nbyte : MAXIOSIZE));
4017 }
4018
4019 #if 0
4020 int
4021 sys_write (fildes, buf, nbyte)
4022 int fildes;
4023 char *buf;
4024 unsigned int nbyte;
4025 {
4026 register int nwrote, rtnval = 0;
4027
4028 while (nbyte > MAXIOSIZE && (nwrote = write (fildes, buf, MAXIOSIZE)) > 0) {
4029 nbyte -= nwrote;
4030 buf += nwrote;
4031 rtnval += nwrote;
4032 }
4033 if (nwrote < 0)
4034 return rtnval ? rtnval : -1;
4035 if ((nwrote = write (fildes, buf, nbyte)) < 0)
4036 return rtnval ? rtnval : -1;
4037 return (rtnval + nwrote);
4038 }
4039 #endif /* 0 */
4040
4041 /*
4042 * VAX/VMS VAX C RTL really loses. It insists that records
4043 * end with a newline (carriage return) character, and if they
4044 * don't it adds one (nice of it isn't it!)
4045 *
4046 * Thus we do this stupidity below.
4047 */
4048
4049 int
4050 sys_write (fildes, buf, nbytes)
4051 int fildes;
4052 char *buf;
4053 unsigned int nbytes;
4054 {
4055 register char *p;
4056 register char *e;
4057 int sum = 0;
4058 struct stat st;
4059
4060 fstat (fildes, &st);
4061 p = buf;
4062 while (nbytes > 0)
4063 {
4064 int len, retval;
4065
4066 /* Handle fixed-length files with carriage control. */
4067 if (st.st_fab_rfm == FAB$C_FIX
4068 && ((st.st_fab_rat & (FAB$M_FTN | FAB$M_CR)) != 0))
4069 {
4070 len = st.st_fab_mrs;
4071 retval = write (fildes, p, min (len, nbytes));
4072 if (retval != len)
4073 return -1;
4074 retval++; /* This skips the implied carriage control */
4075 }
4076 else
4077 {
4078 e = p + min (MAXIOSIZE, nbytes) - 1;
4079 while (*e != '\n' && e > p) e--;
4080 if (p == e) /* Ok.. so here we add a newline... sigh. */
4081 e = p + min (MAXIOSIZE, nbytes) - 1;
4082 len = e + 1 - p;
4083 retval = write (fildes, p, len);
4084 if (retval != len)
4085 return -1;
4086 }
4087 p += retval;
4088 sum += retval;
4089 nbytes -= retval;
4090 }
4091 return sum;
4092 }
4093
4094 /* Create file NEW copying its attributes from file OLD. If
4095 OLD is 0 or does not exist, create based on the value of
4096 vms_stmlf_recfm. */
4097
4098 /* Protection value the file should ultimately have.
4099 Set by create_copy_attrs, and use by rename_sansversions. */
4100 static unsigned short int fab_final_pro;
4101
4102 int
4103 creat_copy_attrs (old, new)
4104 char *old, *new;
4105 {
4106 struct FAB fab = cc$rms_fab;
4107 struct XABPRO xabpro;
4108 char aclbuf[256]; /* Choice of size is arbitrary. See below. */
4109 extern int vms_stmlf_recfm;
4110
4111 if (old)
4112 {
4113 fab.fab$b_fac = FAB$M_GET;
4114 fab.fab$l_fna = old;
4115 fab.fab$b_fns = strlen (old);
4116 fab.fab$l_xab = (char *) &xabpro;
4117 xabpro = cc$rms_xabpro;
4118 xabpro.xab$l_aclbuf = aclbuf;
4119 xabpro.xab$w_aclsiz = sizeof aclbuf;
4120 /* Call $OPEN to fill in the fab & xabpro fields. */
4121 if (SYS$OPEN (&fab, 0, 0) & 1)
4122 {
4123 SYS$CLOSE (&fab, 0, 0);
4124 fab.fab$l_alq = 0; /* zero the allocation quantity */
4125 if (xabpro.xab$w_acllen > 0)
4126 {
4127 if (xabpro.xab$w_acllen > sizeof aclbuf)
4128 /* If the acl buffer was too short, redo open with longer one.
4129 Wouldn't need to do this if there were some system imposed
4130 limit on the size of an ACL, but I can't find any such. */
4131 {
4132 xabpro.xab$l_aclbuf = (char *) alloca (xabpro.xab$w_acllen);
4133 xabpro.xab$w_aclsiz = xabpro.xab$w_acllen;
4134 if (SYS$OPEN (&fab, 0, 0) & 1)
4135 SYS$CLOSE (&fab, 0, 0);
4136 else
4137 old = 0;
4138 }
4139 }
4140 else
4141 xabpro.xab$l_aclbuf = 0;
4142 }
4143 else
4144 old = 0;
4145 }
4146 fab.fab$l_fna = new;
4147 fab.fab$b_fns = strlen (new);
4148 if (!old)
4149 {
4150 fab.fab$l_xab = 0;
4151 fab.fab$b_rfm = vms_stmlf_recfm ? FAB$C_STMLF : FAB$C_VAR;
4152 fab.fab$b_rat = FAB$M_CR;
4153 }
4154
4155 /* Set the file protections such that we will be able to manipulate
4156 this file. Once we are done writing and renaming it, we will set
4157 the protections back. */
4158 if (old)
4159 fab_final_pro = xabpro.xab$w_pro;
4160 else
4161 SYS$SETDFPROT (0, &fab_final_pro);
4162 xabpro.xab$w_pro &= 0xff0f; /* set O:rewd for now. This is set back later. */
4163
4164 /* Create the new file with either default attrs or attrs copied
4165 from old file. */
4166 if (!(SYS$CREATE (&fab, 0, 0) & 1))
4167 return -1;
4168 SYS$CLOSE (&fab, 0, 0);
4169 /* As this is a "replacement" for creat, return a file descriptor
4170 opened for writing. */
4171 return open (new, O_WRONLY);
4172 }
4173
4174 #ifdef creat
4175 #undef creat
4176 #include <varargs.h>
4177 #ifdef __GNUC__
4178 #ifndef va_count
4179 #define va_count(X) ((X) = *(((int *) &(va_alist)) - 1))
4180 #endif
4181 #endif
4182
4183 sys_creat (va_alist)
4184 va_dcl
4185 {
4186 va_list list_incrementer;
4187 char *name;
4188 int mode;
4189 int rfd; /* related file descriptor */
4190 int fd; /* Our new file descriptor */
4191 int count;
4192 struct stat st_buf;
4193 char rfm[12];
4194 char rat[15];
4195 char mrs[13];
4196 char fsz[13];
4197 extern int vms_stmlf_recfm;
4198
4199 va_count (count);
4200 va_start (list_incrementer);
4201 name = va_arg (list_incrementer, char *);
4202 mode = va_arg (list_incrementer, int);
4203 if (count > 2)
4204 rfd = va_arg (list_incrementer, int);
4205 va_end (list_incrementer);
4206 if (count > 2)
4207 {
4208 /* Use information from the related file descriptor to set record
4209 format of the newly created file. */
4210 fstat (rfd, &st_buf);
4211 switch (st_buf.st_fab_rfm)
4212 {
4213 case FAB$C_FIX:
4214 strcpy (rfm, "rfm = fix");
4215 sprintf (mrs, "mrs = %d", st_buf.st_fab_mrs);
4216 strcpy (rat, "rat = ");
4217 if (st_buf.st_fab_rat & FAB$M_CR)
4218 strcat (rat, "cr");
4219 else if (st_buf.st_fab_rat & FAB$M_FTN)
4220 strcat (rat, "ftn");
4221 else if (st_buf.st_fab_rat & FAB$M_PRN)
4222 strcat (rat, "prn");
4223 if (st_buf.st_fab_rat & FAB$M_BLK)
4224 if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4225 strcat (rat, ", blk");
4226 else
4227 strcat (rat, "blk");
4228 return creat (name, 0, rfm, rat, mrs);
4229
4230 case FAB$C_VFC:
4231 strcpy (rfm, "rfm = vfc");
4232 sprintf (fsz, "fsz = %d", st_buf.st_fab_fsz);
4233 strcpy (rat, "rat = ");
4234 if (st_buf.st_fab_rat & FAB$M_CR)
4235 strcat (rat, "cr");
4236 else if (st_buf.st_fab_rat & FAB$M_FTN)
4237 strcat (rat, "ftn");
4238 else if (st_buf.st_fab_rat & FAB$M_PRN)
4239 strcat (rat, "prn");
4240 if (st_buf.st_fab_rat & FAB$M_BLK)
4241 if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4242 strcat (rat, ", blk");
4243 else
4244 strcat (rat, "blk");
4245 return creat (name, 0, rfm, rat, fsz);
4246
4247 case FAB$C_STM:
4248 strcpy (rfm, "rfm = stm");
4249 break;
4250
4251 case FAB$C_STMCR:
4252 strcpy (rfm, "rfm = stmcr");
4253 break;
4254
4255 case FAB$C_STMLF:
4256 strcpy (rfm, "rfm = stmlf");
4257 break;
4258
4259 case FAB$C_UDF:
4260 strcpy (rfm, "rfm = udf");
4261 break;
4262
4263 case FAB$C_VAR:
4264 strcpy (rfm, "rfm = var");
4265 break;
4266 }
4267 strcpy (rat, "rat = ");
4268 if (st_buf.st_fab_rat & FAB$M_CR)
4269 strcat (rat, "cr");
4270 else if (st_buf.st_fab_rat & FAB$M_FTN)
4271 strcat (rat, "ftn");
4272 else if (st_buf.st_fab_rat & FAB$M_PRN)
4273 strcat (rat, "prn");
4274 if (st_buf.st_fab_rat & FAB$M_BLK)
4275 if (st_buf.st_fab_rat & (FAB$M_CR|FAB$M_FTN|FAB$M_PRN))
4276 strcat (rat, ", blk");
4277 else
4278 strcat (rat, "blk");
4279 }
4280 else
4281 {
4282 strcpy (rfm, vms_stmlf_recfm ? "rfm = stmlf" : "rfm=var");
4283 strcpy (rat, "rat=cr");
4284 }
4285 /* Until the VAX C RTL fixes the many bugs with modes, always use
4286 mode 0 to get the user's default protection. */
4287 fd = creat (name, 0, rfm, rat);
4288 if (fd < 0 && errno == EEXIST)
4289 {
4290 if (unlink (name) < 0)
4291 report_file_error ("delete", build_string (name));
4292 fd = creat (name, 0, rfm, rat);
4293 }
4294 return fd;
4295 }
4296 #endif /* creat */
4297
4298 /* fwrite to stdout is S L O W. Speed it up by using fputc...*/
4299 sys_fwrite (ptr, size, num, fp)
4300 register char * ptr;
4301 FILE * fp;
4302 {
4303 register int tot = num * size;
4304
4305 while (tot--)
4306 fputc (*ptr++, fp);
4307 }
4308
4309 /*
4310 * The VMS C library routine creat actually creates a new version of an
4311 * existing file rather than truncating the old version. There are times
4312 * when this is not the desired behavior, for instance, when writing an
4313 * auto save file (you only want one version), or when you don't have
4314 * write permission in the directory containing the file (but the file
4315 * itself is writable). Hence this routine, which is equivalent to
4316 * "close (creat (fn, 0));" on Unix if fn already exists.
4317 */
4318 int
4319 vms_truncate (fn)
4320 char *fn;
4321 {
4322 struct FAB xfab = cc$rms_fab;
4323 struct RAB xrab = cc$rms_rab;
4324 int status;
4325
4326 xfab.fab$l_fop = FAB$M_TEF; /* free allocated but unused blocks on close */
4327 xfab.fab$b_fac = FAB$M_TRN | FAB$M_GET; /* allow truncate and get access */
4328 xfab.fab$b_shr = FAB$M_NIL; /* allow no sharing - file must be locked */
4329 xfab.fab$l_fna = fn;
4330 xfab.fab$b_fns = strlen (fn);
4331 xfab.fab$l_dna = ";0"; /* default to latest version of the file */
4332 xfab.fab$b_dns = 2;
4333 xrab.rab$l_fab = &xfab;
4334
4335 /* This gibberish opens the file, positions to the first record, and
4336 deletes all records from there until the end of file. */
4337 if ((SYS$OPEN (&xfab) & 01) == 01)
4338 {
4339 if ((SYS$CONNECT (&xrab) & 01) == 01 &&
4340 (SYS$FIND (&xrab) & 01) == 01 &&
4341 (SYS$TRUNCATE (&xrab) & 01) == 01)
4342 status = 0;
4343 else
4344 status = -1;
4345 }
4346 else
4347 status = -1;
4348 SYS$CLOSE (&xfab);
4349 return status;
4350 }
4351
4352 /* Define this symbol to actually read SYSUAF.DAT. This requires either
4353 SYSPRV or a readable SYSUAF.DAT. */
4354
4355 #ifdef READ_SYSUAF
4356 /*
4357 * getuaf.c
4358 *
4359 * Routine to read the VMS User Authorization File and return
4360 * a specific user's record.
4361 */
4362
4363 static struct UAF retuaf;
4364
4365 struct UAF *
4366 get_uaf_name (uname)
4367 char * uname;
4368 {
4369 register status;
4370 struct FAB uaf_fab;
4371 struct RAB uaf_rab;
4372
4373 uaf_fab = cc$rms_fab;
4374 uaf_rab = cc$rms_rab;
4375 /* initialize fab fields */
4376 uaf_fab.fab$l_fna = "SYS$SYSTEM:SYSUAF.DAT";
4377 uaf_fab.fab$b_fns = 21;
4378 uaf_fab.fab$b_fac = FAB$M_GET;
4379 uaf_fab.fab$b_org = FAB$C_IDX;
4380 uaf_fab.fab$b_shr = FAB$M_GET|FAB$M_PUT|FAB$M_UPD|FAB$M_DEL;
4381 /* initialize rab fields */
4382 uaf_rab.rab$l_fab = &uaf_fab;
4383 /* open the User Authorization File */
4384 status = SYS$OPEN (&uaf_fab);
4385 if (!(status&1))
4386 {
4387 errno = EVMSERR;
4388 vaxc$errno = status;
4389 return 0;
4390 }
4391 status = SYS$CONNECT (&uaf_rab);
4392 if (!(status&1))
4393 {
4394 errno = EVMSERR;
4395 vaxc$errno = status;
4396 return 0;
4397 }
4398 /* read the requested record - index is in uname */
4399 uaf_rab.rab$l_kbf = uname;
4400 uaf_rab.rab$b_ksz = strlen (uname);
4401 uaf_rab.rab$b_rac = RAB$C_KEY;
4402 uaf_rab.rab$l_ubf = (char *)&retuaf;
4403 uaf_rab.rab$w_usz = sizeof retuaf;
4404 status = SYS$GET (&uaf_rab);
4405 if (!(status&1))
4406 {
4407 errno = EVMSERR;
4408 vaxc$errno = status;
4409 return 0;
4410 }
4411 /* close the User Authorization File */
4412 status = SYS$DISCONNECT (&uaf_rab);
4413 if (!(status&1))
4414 {
4415 errno = EVMSERR;
4416 vaxc$errno = status;
4417 return 0;
4418 }
4419 status = SYS$CLOSE (&uaf_fab);
4420 if (!(status&1))
4421 {
4422 errno = EVMSERR;
4423 vaxc$errno = status;
4424 return 0;
4425 }
4426 return &retuaf;
4427 }
4428
4429 struct UAF *
4430 get_uaf_uic (uic)
4431 unsigned long uic;
4432 {
4433 register status;
4434 struct FAB uaf_fab;
4435 struct RAB uaf_rab;
4436
4437 uaf_fab = cc$rms_fab;
4438 uaf_rab = cc$rms_rab;
4439 /* initialize fab fields */
4440 uaf_fab.fab$l_fna = "SYS$SYSTEM:SYSUAF.DAT";
4441 uaf_fab.fab$b_fns = 21;
4442 uaf_fab.fab$b_fac = FAB$M_GET;
4443 uaf_fab.fab$b_org = FAB$C_IDX;
4444 uaf_fab.fab$b_shr = FAB$M_GET|FAB$M_PUT|FAB$M_UPD|FAB$M_DEL;
4445 /* initialize rab fields */
4446 uaf_rab.rab$l_fab = &uaf_fab;
4447 /* open the User Authorization File */
4448 status = SYS$OPEN (&uaf_fab);
4449 if (!(status&1))
4450 {
4451 errno = EVMSERR;
4452 vaxc$errno = status;
4453 return 0;
4454 }
4455 status = SYS$CONNECT (&uaf_rab);
4456 if (!(status&1))
4457 {
4458 errno = EVMSERR;
4459 vaxc$errno = status;
4460 return 0;
4461 }
4462 /* read the requested record - index is in uic */
4463 uaf_rab.rab$b_krf = 1; /* 1st alternate key */
4464 uaf_rab.rab$l_kbf = (char *) &uic;
4465 uaf_rab.rab$b_ksz = sizeof uic;
4466 uaf_rab.rab$b_rac = RAB$C_KEY;
4467 uaf_rab.rab$l_ubf = (char *)&retuaf;
4468 uaf_rab.rab$w_usz = sizeof retuaf;
4469 status = SYS$GET (&uaf_rab);
4470 if (!(status&1))
4471 {
4472 errno = EVMSERR;
4473 vaxc$errno = status;
4474 return 0;
4475 }
4476 /* close the User Authorization File */
4477 status = SYS$DISCONNECT (&uaf_rab);
4478 if (!(status&1))
4479 {
4480 errno = EVMSERR;
4481 vaxc$errno = status;
4482 return 0;
4483 }
4484 status = SYS$CLOSE (&uaf_fab);
4485 if (!(status&1))
4486 {
4487 errno = EVMSERR;
4488 vaxc$errno = status;
4489 return 0;
4490 }
4491 return &retuaf;
4492 }
4493
4494 static struct passwd retpw;
4495
4496 struct passwd *
4497 cnv_uaf_pw (up)
4498 struct UAF * up;
4499 {
4500 char * ptr;
4501
4502 /* copy these out first because if the username is 32 chars, the next
4503 section will overwrite the first byte of the UIC */
4504 retpw.pw_uid = up->uaf$w_mem;
4505 retpw.pw_gid = up->uaf$w_grp;
4506
4507 /* I suppose this is not the best style, to possibly overwrite one
4508 byte beyond the end of the field, but what the heck... */
4509 ptr = &up->uaf$t_username[UAF$S_USERNAME];
4510 while (ptr[-1] == ' ')
4511 ptr--;
4512 *ptr = '\0';
4513 strcpy (retpw.pw_name, up->uaf$t_username);
4514
4515 /* the rest of these are counted ascii strings */
4516 strncpy (retpw.pw_gecos, &up->uaf$t_owner[1], up->uaf$t_owner[0]);
4517 retpw.pw_gecos[up->uaf$t_owner[0]] = '\0';
4518 strncpy (retpw.pw_dir, &up->uaf$t_defdev[1], up->uaf$t_defdev[0]);
4519 retpw.pw_dir[up->uaf$t_defdev[0]] = '\0';
4520 strncat (retpw.pw_dir, &up->uaf$t_defdir[1], up->uaf$t_defdir[0]);
4521 retpw.pw_dir[up->uaf$t_defdev[0] + up->uaf$t_defdir[0]] = '\0';
4522 strncpy (retpw.pw_shell, &up->uaf$t_defcli[1], up->uaf$t_defcli[0]);
4523 retpw.pw_shell[up->uaf$t_defcli[0]] = '\0';
4524
4525 return &retpw;
4526 }
4527 #else /* not READ_SYSUAF */
4528 static struct passwd retpw;
4529 #endif /* not READ_SYSUAF */
4530
4531 struct passwd *
4532 getpwnam (name)
4533 char * name;
4534 {
4535 #ifdef READ_SYSUAF
4536 struct UAF *up;
4537 #else
4538 char * user;
4539 char * dir;
4540 unsigned char * full;
4541 #endif /* READ_SYSUAF */
4542 char *ptr = name;
4543
4544 while (*ptr)
4545 {
4546 if ('a' <= *ptr && *ptr <= 'z')
4547 *ptr -= 040;
4548 ptr++;
4549 }
4550 #ifdef READ_SYSUAF
4551 if (!(up = get_uaf_name (name)))
4552 return 0;
4553 return cnv_uaf_pw (up);
4554 #else
4555 if (strcmp (name, getenv ("USER")) == 0)
4556 {
4557 retpw.pw_uid = getuid ();
4558 retpw.pw_gid = getgid ();
4559 strcpy (retpw.pw_name, name);
4560 if (full = egetenv ("FULLNAME"))
4561 strcpy (retpw.pw_gecos, full);
4562 else
4563 *retpw.pw_gecos = '\0';
4564 strcpy (retpw.pw_dir, egetenv ("HOME"));
4565 *retpw.pw_shell = '\0';
4566 return &retpw;
4567 }
4568 else
4569 return 0;
4570 #endif /* not READ_SYSUAF */
4571 }
4572
4573 struct passwd *
4574 getpwuid (uid)
4575 unsigned long uid;
4576 {
4577 #ifdef READ_SYSUAF
4578 struct UAF * up;
4579
4580 if (!(up = get_uaf_uic (uid)))
4581 return 0;
4582 return cnv_uaf_pw (up);
4583 #else
4584 if (uid == sys_getuid ())
4585 return getpwnam (egetenv ("USER"));
4586 else
4587 return 0;
4588 #endif /* not READ_SYSUAF */
4589 }
4590
4591 /* return total address space available to the current process. This is
4592 the sum of the current p0 size, p1 size and free page table entries
4593 available. */
4594 vlimit ()
4595 {
4596 int item_code;
4597 unsigned long free_pages;
4598 unsigned long frep0va;
4599 unsigned long frep1va;
4600 register status;
4601
4602 item_code = JPI$_FREPTECNT;
4603 if (((status = LIB$GETJPI (&item_code, 0, 0, &free_pages)) & 1) == 0)
4604 {
4605 errno = EVMSERR;
4606 vaxc$errno = status;
4607 return -1;
4608 }
4609 free_pages *= 512;
4610
4611 item_code = JPI$_FREP0VA;
4612 if (((status = LIB$GETJPI (&item_code, 0, 0, &frep0va)) & 1) == 0)
4613 {
4614 errno = EVMSERR;
4615 vaxc$errno = status;
4616 return -1;
4617 }
4618 item_code = JPI$_FREP1VA;
4619 if (((status = LIB$GETJPI (&item_code, 0, 0, &frep1va)) & 1) == 0)
4620 {
4621 errno = EVMSERR;
4622 vaxc$errno = status;
4623 return -1;
4624 }
4625
4626 return free_pages + frep0va + (0x7fffffff - frep1va);
4627 }
4628
4629 define_logical_name (varname, string)
4630 char *varname;
4631 char *string;
4632 {
4633 struct dsc$descriptor_s strdsc =
4634 {strlen (string), DSC$K_DTYPE_T, DSC$K_CLASS_S, string};
4635 struct dsc$descriptor_s envdsc =
4636 {strlen (varname), DSC$K_DTYPE_T, DSC$K_CLASS_S, varname};
4637 struct dsc$descriptor_s lnmdsc =
4638 {7, DSC$K_DTYPE_T, DSC$K_CLASS_S, "LNM$JOB"};
4639
4640 return LIB$SET_LOGICAL (&envdsc, &strdsc, &lnmdsc, 0, 0);
4641 }
4642
4643 delete_logical_name (varname)
4644 char *varname;
4645 {
4646 struct dsc$descriptor_s envdsc =
4647 {strlen (varname), DSC$K_DTYPE_T, DSC$K_CLASS_S, varname};
4648 struct dsc$descriptor_s lnmdsc =
4649 {7, DSC$K_DTYPE_T, DSC$K_CLASS_S, "LNM$JOB"};
4650
4651 return LIB$DELETE_LOGICAL (&envdsc, &lnmdsc);
4652 }
4653
4654 ulimit ()
4655 {}
4656
4657 setpgrp ()
4658 {}
4659
4660 execvp ()
4661 {
4662 error ("execvp system call not implemented");
4663 }
4664
4665 int
4666 rename (from, to)
4667 char *from, *to;
4668 {
4669 int status;
4670 struct FAB from_fab = cc$rms_fab, to_fab = cc$rms_fab;
4671 struct NAM from_nam = cc$rms_nam, to_nam = cc$rms_nam;
4672 char from_esn[NAM$C_MAXRSS];
4673 char to_esn[NAM$C_MAXRSS];
4674
4675 from_fab.fab$l_fna = from;
4676 from_fab.fab$b_fns = strlen (from);
4677 from_fab.fab$l_nam = &from_nam;
4678 from_fab.fab$l_fop = FAB$M_NAM;
4679
4680 from_nam.nam$l_esa = from_esn;
4681 from_nam.nam$b_ess = sizeof from_esn;
4682
4683 to_fab.fab$l_fna = to;
4684 to_fab.fab$b_fns = strlen (to);
4685 to_fab.fab$l_nam = &to_nam;
4686 to_fab.fab$l_fop = FAB$M_NAM;
4687
4688 to_nam.nam$l_esa = to_esn;
4689 to_nam.nam$b_ess = sizeof to_esn;
4690
4691 status = SYS$RENAME (&from_fab, 0, 0, &to_fab);
4692
4693 if (status & 1)
4694 return 0;
4695 else
4696 {
4697 if (status == RMS$_DEV)
4698 errno = EXDEV;
4699 else
4700 errno = EVMSERR;
4701 vaxc$errno = status;
4702 return -1;
4703 }
4704 }
4705
4706 /* This function renames a file like `rename', but it strips
4707 the version number from the "to" filename, such that the "to" file is
4708 will always be a new version. It also sets the file protection once it is
4709 finished. The protection that we will use is stored in fab_final_pro,
4710 and was set when we did a creat_copy_attrs to create the file that we
4711 are renaming.
4712
4713 We could use the chmod function, but Eunichs uses 3 bits per user category
4714 to describe the protection, and VMS uses 4 (write and delete are separate
4715 bits). To maintain portability, the VMS implementation of `chmod' wires
4716 the W and D bits together. */
4717
4718
4719 static struct fibdef fib; /* We need this initialized to zero */
4720 char vms_file_written[NAM$C_MAXRSS];
4721
4722 int
4723 rename_sans_version (from,to)
4724 char *from, *to;
4725 {
4726 short int chan;
4727 int stat;
4728 short int iosb[4];
4729 int status;
4730 struct FAB to_fab = cc$rms_fab;
4731 struct NAM to_nam = cc$rms_nam;
4732 struct dsc$descriptor fib_d ={sizeof (fib),0,0,(char*) &fib};
4733 struct dsc$descriptor fib_attr[2]
4734 = {{sizeof (fab_final_pro),ATR$C_FPRO,0,(char*) &fab_final_pro},{0,0,0,0}};
4735 char to_esn[NAM$C_MAXRSS];
4736
4737 $DESCRIPTOR (disk,to_esn);
4738
4739 to_fab.fab$l_fna = to;
4740 to_fab.fab$b_fns = strlen (to);
4741 to_fab.fab$l_nam = &to_nam;
4742 to_fab.fab$l_fop = FAB$M_NAM;
4743
4744 to_nam.nam$l_esa = to_esn;
4745 to_nam.nam$b_ess = sizeof to_esn;
4746
4747 status = SYS$PARSE (&to_fab, 0, 0); /* figure out the full file name */
4748
4749 if (to_nam.nam$l_fnb && NAM$M_EXP_VER)
4750 *(to_nam.nam$l_ver) = '\0';
4751
4752 stat = rename (from, to_esn);
4753 if (stat < 0)
4754 return stat;
4755
4756 strcpy (vms_file_written, to_esn);
4757
4758 to_fab.fab$l_fna = vms_file_written; /* this points to the versionless name */
4759 to_fab.fab$b_fns = strlen (vms_file_written);
4760
4761 /* Now set the file protection to the correct value */
4762 SYS$OPEN (&to_fab, 0, 0); /* This fills in the nam$w_fid fields */
4763
4764 /* Copy these fields into the fib */
4765 fib.fib$r_fid_overlay.fib$w_fid[0] = to_nam.nam$w_fid[0];
4766 fib.fib$r_fid_overlay.fib$w_fid[1] = to_nam.nam$w_fid[1];
4767 fib.fib$r_fid_overlay.fib$w_fid[2] = to_nam.nam$w_fid[2];
4768
4769 SYS$CLOSE (&to_fab, 0, 0);
4770
4771 stat = SYS$ASSIGN (&disk, &chan, 0, 0); /* open a channel to the disk */
4772 if (!stat)
4773 LIB$SIGNAL (stat);
4774 stat = SYS$QIOW (0, chan, IO$_MODIFY, iosb, 0, 0, &fib_d,
4775 0, 0, 0, &fib_attr, 0);
4776 if (!stat)
4777 LIB$SIGNAL (stat);
4778 stat = SYS$DASSGN (chan);
4779 if (!stat)
4780 LIB$SIGNAL (stat);
4781 strcpy (vms_file_written, to_esn); /* We will write this to the terminal*/
4782 return 0;
4783 }
4784
4785 link (file, new)
4786 char * file, * new;
4787 {
4788 register status;
4789 struct FAB fab;
4790 struct NAM nam;
4791 unsigned short fid[3];
4792 char esa[NAM$C_MAXRSS];
4793
4794 fab = cc$rms_fab;
4795 fab.fab$l_fop = FAB$M_OFP;
4796 fab.fab$l_fna = file;
4797 fab.fab$b_fns = strlen (file);
4798 fab.fab$l_nam = &nam;
4799
4800 nam = cc$rms_nam;
4801 nam.nam$l_esa = esa;
4802 nam.nam$b_ess = NAM$C_MAXRSS;
4803
4804 status = SYS$PARSE (&fab);
4805 if ((status & 1) == 0)
4806 {
4807 errno = EVMSERR;
4808 vaxc$errno = status;
4809 return -1;
4810 }
4811 status = SYS$SEARCH (&fab);
4812 if ((status & 1) == 0)
4813 {
4814 errno = EVMSERR;
4815 vaxc$errno = status;
4816 return -1;
4817 }
4818
4819 fid[0] = nam.nam$w_fid[0];
4820 fid[1] = nam.nam$w_fid[1];
4821 fid[2] = nam.nam$w_fid[2];
4822
4823 fab.fab$l_fna = new;
4824 fab.fab$b_fns = strlen (new);
4825
4826 status = SYS$PARSE (&fab);
4827 if ((status & 1) == 0)
4828 {
4829 errno = EVMSERR;
4830 vaxc$errno = status;
4831 return -1;
4832 }
4833
4834 nam.nam$w_fid[0] = fid[0];
4835 nam.nam$w_fid[1] = fid[1];
4836 nam.nam$w_fid[2] = fid[2];
4837
4838 nam.nam$l_esa = nam.nam$l_name;
4839 nam.nam$b_esl = nam.nam$b_name + nam.nam$b_type + nam.nam$b_ver;
4840
4841 status = SYS$ENTER (&fab);
4842 if ((status & 1) == 0)
4843 {
4844 errno = EVMSERR;
4845 vaxc$errno = status;
4846 return -1;
4847 }
4848
4849 return 0;
4850 }
4851
4852 croak (badfunc)
4853 char *badfunc;
4854 {
4855 printf ("%s not yet implemented\r\n", badfunc);
4856 reset_sys_modes ();
4857 exit (1);
4858 }
4859
4860 long
4861 random ()
4862 {
4863 /* Arrange to return a range centered on zero. */
4864 return rand () - (1 << 30);
4865 }
4866
4867 srandom (seed)
4868 {
4869 srand (seed);
4870 }
4871 #endif /* VMS */
4872 \f
4873 #ifdef AIXHFT
4874
4875 /* Called from init_sys_modes. */
4876 hft_init ()
4877 {
4878 int junk;
4879
4880 /* If we're not on an HFT we shouldn't do any of this. We determine
4881 if we are on an HFT by trying to get an HFT error code. If this
4882 call fails, we're not on an HFT. */
4883 #ifdef IBMR2AIX
4884 if (ioctl (0, HFQERROR, &junk) < 0)
4885 return;
4886 #else /* not IBMR2AIX */
4887 if (ioctl (0, HFQEIO, 0) < 0)
4888 return;
4889 #endif /* not IBMR2AIX */
4890
4891 /* On AIX the default hft keyboard mapping uses backspace rather than delete
4892 as the rubout key's ASCII code. Here this is changed. The bug is that
4893 there's no way to determine the old mapping, so in reset_sys_modes
4894 we need to assume that the normal map had been present. Of course, this
4895 code also doesn't help if on a terminal emulator which doesn't understand
4896 HFT VTD's. */
4897 {
4898 struct hfbuf buf;
4899 struct hfkeymap keymap;
4900
4901 buf.hf_bufp = (char *)&keymap;
4902 buf.hf_buflen = sizeof (keymap);
4903 keymap.hf_nkeys = 2;
4904 keymap.hfkey[0].hf_kpos = 15;
4905 keymap.hfkey[0].hf_kstate = HFMAPCHAR | HFSHFNONE;
4906 #ifdef IBMR2AIX
4907 keymap.hfkey[0].hf_keyidh = '<';
4908 #else /* not IBMR2AIX */
4909 keymap.hfkey[0].hf_page = '<';
4910 #endif /* not IBMR2AIX */
4911 keymap.hfkey[0].hf_char = 127;
4912 keymap.hfkey[1].hf_kpos = 15;
4913 keymap.hfkey[1].hf_kstate = HFMAPCHAR | HFSHFSHFT;
4914 #ifdef IBMR2AIX
4915 keymap.hfkey[1].hf_keyidh = '<';
4916 #else /* not IBMR2AIX */
4917 keymap.hfkey[1].hf_page = '<';
4918 #endif /* not IBMR2AIX */
4919 keymap.hfkey[1].hf_char = 127;
4920 hftctl (0, HFSKBD, &buf);
4921 }
4922 /* The HFT system on AIX doesn't optimize for scrolling, so it's really ugly
4923 at times. */
4924 line_ins_del_ok = char_ins_del_ok = 0;
4925 }
4926
4927 /* Reset the rubout key to backspace. */
4928
4929 hft_reset ()
4930 {
4931 struct hfbuf buf;
4932 struct hfkeymap keymap;
4933 int junk;
4934
4935 #ifdef IBMR2AIX
4936 if (ioctl (0, HFQERROR, &junk) < 0)
4937 return;
4938 #else /* not IBMR2AIX */
4939 if (ioctl (0, HFQEIO, 0) < 0)
4940 return;
4941 #endif /* not IBMR2AIX */
4942
4943 buf.hf_bufp = (char *)&keymap;
4944 buf.hf_buflen = sizeof (keymap);
4945 keymap.hf_nkeys = 2;
4946 keymap.hfkey[0].hf_kpos = 15;
4947 keymap.hfkey[0].hf_kstate = HFMAPCHAR | HFSHFNONE;
4948 #ifdef IBMR2AIX
4949 keymap.hfkey[0].hf_keyidh = '<';
4950 #else /* not IBMR2AIX */
4951 keymap.hfkey[0].hf_page = '<';
4952 #endif /* not IBMR2AIX */
4953 keymap.hfkey[0].hf_char = 8;
4954 keymap.hfkey[1].hf_kpos = 15;
4955 keymap.hfkey[1].hf_kstate = HFMAPCHAR | HFSHFSHFT;
4956 #ifdef IBMR2AIX
4957 keymap.hfkey[1].hf_keyidh = '<';
4958 #else /* not IBMR2AIX */
4959 keymap.hfkey[1].hf_page = '<';
4960 #endif /* not IBMR2AIX */
4961 keymap.hfkey[1].hf_char = 8;
4962 hftctl (0, HFSKBD, &buf);
4963 }
4964
4965 #endif /* AIXHFT */
4966
4967 #ifdef USE_DL_STUBS
4968
4969 /* These are included on Sunos 4.1 when we do not use shared libraries.
4970 X11 libraries may refer to these functions but (we hope) do not
4971 actually call them. */
4972
4973 void *
4974 dlopen ()
4975 {
4976 return 0;
4977 }
4978
4979 void *
4980 dlsym ()
4981 {
4982 return 0;
4983 }
4984
4985 int
4986 dlclose ()
4987 {
4988 return -1;
4989 }
4990
4991 #endif /* USE_DL_STUBS */
4992 \f
4993 #ifndef BSTRING
4994
4995 #ifndef bzero
4996
4997 void
4998 bzero (b, length)
4999 register char *b;
5000 register int length;
5001 {
5002 #ifdef VMS
5003 short zero = 0;
5004 long max_str = 65535;
5005
5006 while (length > max_str) {
5007 (void) LIB$MOVC5 (&zero, &zero, &zero, &max_str, b);
5008 length -= max_str;
5009 b += max_str;
5010 }
5011 max_str = length;
5012 (void) LIB$MOVC5 (&zero, &zero, &zero, &max_str, b);
5013 #else
5014 while (length-- > 0)
5015 *b++ = 0;
5016 #endif /* not VMS */
5017 }
5018
5019 #endif /* no bzero */
5020 #endif /* BSTRING */
5021
5022 #if (!defined (BSTRING) && !defined (bcopy)) || defined (NEED_BCOPY)
5023 #undef bcopy
5024
5025 /* Saying `void' requires a declaration, above, where bcopy is used
5026 and that declaration causes pain for systems where bcopy is a macro. */
5027 bcopy (b1, b2, length)
5028 register char *b1;
5029 register char *b2;
5030 register int length;
5031 {
5032 #ifdef VMS
5033 long max_str = 65535;
5034
5035 while (length > max_str) {
5036 (void) LIB$MOVC3 (&max_str, b1, b2);
5037 length -= max_str;
5038 b1 += max_str;
5039 b2 += max_str;
5040 }
5041 max_str = length;
5042 (void) LIB$MOVC3 (&length, b1, b2);
5043 #else
5044 while (length-- > 0)
5045 *b2++ = *b1++;
5046 #endif /* not VMS */
5047 }
5048 #endif /* (defined (BSTRING) && !defined (bcopy)) || defined (NEED_BCOPY) */
5049
5050 #ifndef BSTRING
5051 #ifndef bcmp
5052 int
5053 bcmp (b1, b2, length) /* This could be a macro! */
5054 register char *b1;
5055 register char *b2;
5056 register int length;
5057 {
5058 #ifdef VMS
5059 struct dsc$descriptor_s src1 = {length, DSC$K_DTYPE_T, DSC$K_CLASS_S, b1};
5060 struct dsc$descriptor_s src2 = {length, DSC$K_DTYPE_T, DSC$K_CLASS_S, b2};
5061
5062 return STR$COMPARE (&src1, &src2);
5063 #else
5064 while (length-- > 0)
5065 if (*b1++ != *b2++)
5066 return 1;
5067
5068 return 0;
5069 #endif /* not VMS */
5070 }
5071 #endif /* no bcmp */
5072 #endif /* not BSTRING */
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