libguile/posix.c

   1 /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public License
   5  * as published by the Free Software Foundation; either version 3 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301 USA
  17  */
  18
  19
  20 \f
  21 #ifdef HAVE_CONFIG_H
  22 #  include <config.h>
  23 #endif
  24
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <errno.h>
  28 #include <uniconv.h>
  29
  30 #ifdef HAVE_SCHED_H
  31 # include <sched.h>
  32 #endif
  33
  34 #include "libguile/_scm.h"
  35 #include "libguile/dynwind.h"
  36 #include "libguile/fports.h"
  37 #include "libguile/scmsigs.h"
  38 #include "libguile/feature.h"
  39 #include "libguile/strings.h"
  40 #include "libguile/srfi-13.h"
  41 #include "libguile/srfi-14.h"
  42 #include "libguile/vectors.h"
  43 #include "libguile/values.h"
  44
  45 #include "libguile/validate.h"
  46 #include "libguile/posix.h"
  47 #include "libguile/gettext.h"
  48 #include "libguile/threads.h"
  49 \f
  50
  51 #ifdef HAVE_STRING_H
  52 #include <string.h>
  53 #endif
  54 #ifdef TIME_WITH_SYS_TIME
  55 # include <sys/time.h>
  56 # include <time.h>
  57 #else
  58 # if HAVE_SYS_TIME_H
  59 #  include <sys/time.h>
  60 # else
  61 #  include <time.h>
  62 # endif
  63 #endif
  64
  65 #ifdef HAVE_UNISTD_H
  66 #include <unistd.h>
  67 #else
  68 #ifndef ttyname
  69 extern char *ttyname();
  70 #endif
  71 #endif
  72
  73 #ifdef LIBC_H_WITH_UNISTD_H
  74 #include <libc.h>
  75 #endif
  76
  77 #include <sys/types.h>
  78 #include <sys/stat.h>
  79 #include <fcntl.h>
  80
  81 #ifdef HAVE_PWD_H
  82 #include <pwd.h>
  83 #endif
  84 #ifdef HAVE_IO_H
  85 #include <io.h>
  86 #endif
  87 #ifdef HAVE_WINSOCK2_H
  88 #include <winsock2.h>
  89 #endif
  90
  91 #ifdef __MINGW32__
  92 /* Some defines for Windows here. */
  93 # include <process.h>
  94 # define pipe(fd) _pipe (fd, 256, O_BINARY)
  95 #endif /* __MINGW32__ */
  96
  97 #if HAVE_SYS_WAIT_H
  98 # include <sys/wait.h>
  99 #endif
 100 #ifndef WEXITSTATUS
 101 # define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
 102 #endif
 103 #ifndef WIFEXITED
 104 # define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
 105 #endif
 106
 107 #include <signal.h>
 108
 109 #ifdef HAVE_GRP_H
 110 #include <grp.h>
 111 #endif
 112 #ifdef HAVE_SYS_UTSNAME_H
 113 #include <sys/utsname.h>
 114 #endif
 115
 116 #ifdef HAVE_SETLOCALE
 117 #include <locale.h>
 118 #endif
 119
 120 #if (defined HAVE_NEWLOCALE) && (defined HAVE_STRCOLL_L)
 121 # define USE_GNU_LOCALE_API
 122 #endif
 123
 124 #if (defined USE_GNU_LOCALE_API) && (defined HAVE_XLOCALE_H)
 125 # include <xlocale.h>
 126 #endif
 127
 128 #ifdef HAVE_CRYPT_H
 129 #  include <crypt.h>
 130 #endif
 131
 132 #ifdef HAVE_NETDB_H
 133 #include <netdb.h>      /* for MAXHOSTNAMELEN on Solaris */
 134 #endif
 135
 136 #ifdef HAVE_SYS_PARAM_H
 137 #include <sys/param.h>  /* for MAXHOSTNAMELEN */
 138 #endif
 139
 140 #if HAVE_SYS_RESOURCE_H
 141 #  include <sys/resource.h>
 142 #endif
 143
 144 #include <sys/file.h>     /* from Gnulib */
 145
 146 /* Some Unix systems don't define these.  CPP hair is dangerous, but
 147    this seems safe enough... */
 148 #ifndef R_OK
 149 #define R_OK 4
 150 #endif
 151
 152 #ifndef W_OK
 153 #define W_OK 2
 154 #endif
 155
 156 #ifndef X_OK
 157 #define X_OK 1
 158 #endif
 159
 160 #ifndef F_OK
 161 #define F_OK 0
 162 #endif
 163
 164 /* No prototype for this on Solaris 10.  The man page says it's in
 165    <unistd.h> ... but it lies. */
 166 #if ! HAVE_DECL_SETHOSTNAME
 167 int sethostname (char *name, size_t namelen);
 168 #endif
 169
 170 /* On NextStep, <utime.h> doesn't define struct utime, unless we
 171    #define _POSIX_SOURCE before #including it.  I think this is less
 172    of a kludge than defining struct utimbuf ourselves.  */
 173 #ifdef UTIMBUF_NEEDS_POSIX
 174 #define _POSIX_SOURCE
 175 #endif
 176
 177 #ifdef HAVE_SYS_UTIME_H
 178 #include <sys/utime.h>
 179 #endif
 180
 181 #ifdef HAVE_UTIME_H
 182 #include <utime.h>
 183 #endif
 184
 185 /* Please don't add any more #includes or #defines here.  The hack
 186    above means that _POSIX_SOURCE may be #defined, which will
 187    encourage header files to do strange things.
 188
 189    FIXME: Maybe should undef _POSIX_SOURCE after it's done its job.
 190
 191    FIXME: Probably should do all the includes first, then all the fallback
 192    declarations and defines, in case things are not in the header we
 193    imagine.  */
 194
 195
 196
 197
 198 \f
 199
 200 /* Two often used patterns
 201  */
 202
 203 #define WITH_STRING(str,cstr,code)             \
 204   do {                                         \
 205     char *cstr = scm_to_locale_string (str);   \
 206     code;                                      \
 207     free (cstr);                               \
 208   } while (0)
 209
 210 #define STRING_SYSCALL(str,cstr,code)        \
 211   do {                                       \
 212     int eno;                                 \
 213     char *cstr = scm_to_locale_string (str); \
 214     SCM_SYSCALL (code);                      \
 215     eno = errno; free (cstr); errno = eno;   \
 216   } while (0)
 217
 218
 219 \f
 220 SCM_SYMBOL (sym_read_pipe, "read pipe");
 221 SCM_SYMBOL (sym_write_pipe, "write pipe");
 222
 223 SCM_DEFINE (scm_pipe, "pipe", 0, 0, 0,
 224             (),
 225             "Return a newly created pipe: a pair of ports which are linked\n"
 226             "together on the local machine.  The @emph{car} is the input\n"
 227             "port and the @emph{cdr} is the output port.  Data written (and\n"
 228             "flushed) to the output port can be read from the input port.\n"
 229             "Pipes are commonly used for communication with a newly forked\n"
 230             "child process.  The need to flush the output port can be\n"
 231             "avoided by making it unbuffered using @code{setvbuf}.\n"
 232             "\n"
 233             "Writes occur atomically provided the size of the data in bytes\n"
 234             "is not greater than the value of @code{PIPE_BUF}.  Note that\n"
 235             "the output port is likely to block if too much data (typically\n"
 236             "equal to @code{PIPE_BUF}) has been written but not yet read\n"
 237             "from the input port.")
 238 #define FUNC_NAME s_scm_pipe
 239 {
 240   int fd[2], rv;
 241   SCM p_rd, p_wt;
 242
 243   rv = pipe (fd);
 244   if (rv)
 245     SCM_SYSERROR;
 246
 247   p_rd = scm_fdes_to_port (fd[0], "r", sym_read_pipe);
 248   p_wt = scm_fdes_to_port (fd[1], "w", sym_write_pipe);
 249   return scm_cons (p_rd, p_wt);
 250 }
 251 #undef FUNC_NAME
 252
 253
 254 #ifdef HAVE_GETGROUPS
 255 SCM_DEFINE (scm_getgroups, "getgroups", 0, 0, 0,
 256             (),
 257             "Return a vector of integers representing the current\n"
 258             "supplementary group IDs.")
 259 #define FUNC_NAME s_scm_getgroups
 260 {
 261   SCM result;
 262   int ngroups;
 263   size_t size;
 264   GETGROUPS_T *groups;
 265
 266   ngroups = getgroups (0, NULL);
 267   if (ngroups <= 0)
 268     SCM_SYSERROR;
 269
 270   size = ngroups * sizeof (GETGROUPS_T);
 271   groups = scm_malloc (size);
 272   ngroups = getgroups (ngroups, groups);
 273
 274   result = scm_c_make_vector (ngroups, SCM_BOOL_F);
 275   while (--ngroups >= 0)
 276     SCM_SIMPLE_VECTOR_SET (result, ngroups, scm_from_ulong (groups[ngroups]));
 277
 278   free (groups);
 279   return result;
 280 }
 281 #undef FUNC_NAME
 282 #endif
 283
 284 #ifdef HAVE_SETGROUPS
 285 SCM_DEFINE (scm_setgroups, "setgroups", 1, 0, 0,
 286             (SCM group_vec),
 287             "Set the current set of supplementary group IDs to the integers\n"
 288             "in the given vector @var{group_vec}.  The return value is\n"
 289             "unspecified.\n"
 290             "\n"
 291             "Generally only the superuser can set the process group IDs.")
 292 #define FUNC_NAME s_scm_setgroups
 293 {
 294   size_t ngroups;
 295   size_t size;
 296   size_t i;
 297   int result;
 298   int save_errno;
 299   GETGROUPS_T *groups;
 300
 301   SCM_VALIDATE_VECTOR (SCM_ARG1, group_vec);
 302
 303   ngroups = SCM_SIMPLE_VECTOR_LENGTH (group_vec);
 304
 305   /* validate before allocating, so we don't have to worry about leaks */
 306   for (i = 0; i < ngroups; i++)
 307     {
 308       unsigned long ulong_gid;
 309       GETGROUPS_T gid;
 310       SCM_VALIDATE_ULONG_COPY (1, SCM_SIMPLE_VECTOR_REF (group_vec, i),
 311                                ulong_gid);
 312       gid = ulong_gid;
 313       if (gid != ulong_gid)
 314         SCM_OUT_OF_RANGE (1, SCM_SIMPLE_VECTOR_REF (group_vec, i));
 315     }
 316
 317   size = ngroups * sizeof (GETGROUPS_T);
 318   if (size / sizeof (GETGROUPS_T) != ngroups)
 319     SCM_OUT_OF_RANGE (SCM_ARG1, scm_from_int (ngroups));
 320   groups = scm_malloc (size);
 321   for(i = 0; i < ngroups; i++)
 322     groups [i] = SCM_NUM2ULONG (1, SCM_SIMPLE_VECTOR_REF (group_vec, i));
 323
 324   result = setgroups (ngroups, groups);
 325   save_errno = errno; /* don't let free() touch errno */
 326   free (groups);
 327   errno = save_errno;
 328   if (result < 0)
 329     SCM_SYSERROR;
 330   return SCM_UNSPECIFIED;
 331 }
 332 #undef FUNC_NAME
 333 #endif
 334
 335 #ifdef HAVE_GETPWENT
 336 SCM_DEFINE (scm_getpwuid, "getpw", 0, 1, 0,
 337             (SCM user),
 338             "Look up an entry in the user database.  @var{user} can be an\n"
 339             "integer, a string, or omitted, giving the behaviour of\n"
 340             "@code{getpwuid}, @code{getpwnam} or @code{getpwent}\n"
 341             "respectively.")
 342 #define FUNC_NAME s_scm_getpwuid
 343 {
 344   struct passwd *entry;
 345
 346   SCM result = scm_c_make_vector (7, SCM_UNSPECIFIED);
 347   if (SCM_UNBNDP (user) || scm_is_false (user))
 348     {
 349       SCM_SYSCALL (entry = getpwent ());
 350       if (! entry)
 351         {
 352           return SCM_BOOL_F;
 353         }
 354     }
 355   else if (scm_is_integer (user))
 356     {
 357       entry = getpwuid (scm_to_int (user));
 358     }
 359   else
 360     {
 361       WITH_STRING (user, c_user,
 362                    entry = getpwnam (c_user));
 363     }
 364   if (!entry)
 365     SCM_MISC_ERROR ("entry not found", SCM_EOL);
 366
 367   SCM_SIMPLE_VECTOR_SET(result, 0, scm_from_locale_string (entry->pw_name));
 368   SCM_SIMPLE_VECTOR_SET(result, 1, scm_from_locale_string (entry->pw_passwd));
 369   SCM_SIMPLE_VECTOR_SET(result, 2, scm_from_ulong (entry->pw_uid));
 370   SCM_SIMPLE_VECTOR_SET(result, 3, scm_from_ulong (entry->pw_gid));
 371   SCM_SIMPLE_VECTOR_SET(result, 4, scm_from_locale_string (entry->pw_gecos));
 372   if (!entry->pw_dir)
 373     SCM_SIMPLE_VECTOR_SET(result, 5, scm_from_locale_string (""));
 374   else
 375     SCM_SIMPLE_VECTOR_SET(result, 5, scm_from_locale_string (entry->pw_dir));
 376   if (!entry->pw_shell)
 377     SCM_SIMPLE_VECTOR_SET(result, 6, scm_from_locale_string (""));
 378   else
 379     SCM_SIMPLE_VECTOR_SET(result, 6, scm_from_locale_string (entry->pw_shell));
 380   return result;
 381 }
 382 #undef FUNC_NAME
 383 #endif /* HAVE_GETPWENT */
 384
 385
 386 #ifdef HAVE_SETPWENT
 387 SCM_DEFINE (scm_setpwent, "setpw", 0, 1, 0,
 388             (SCM arg),
 389             "If called with a true argument, initialize or reset the password data\n"
 390             "stream.  Otherwise, close the stream.  The @code{setpwent} and\n"
 391             "@code{endpwent} procedures are implemented on top of this.")
 392 #define FUNC_NAME s_scm_setpwent
 393 {
 394   if (SCM_UNBNDP (arg) || scm_is_false (arg))
 395     endpwent ();
 396   else
 397     setpwent ();
 398   return SCM_UNSPECIFIED;
 399 }
 400 #undef FUNC_NAME
 401 #endif
 402
 403
 404 #ifdef HAVE_GETGRENT
 405 /* Combines getgrgid and getgrnam.  */
 406 SCM_DEFINE (scm_getgrgid, "getgr", 0, 1, 0,
 407             (SCM name),
 408             "Look up an entry in the group database.  @var{name} can be an\n"
 409             "integer, a string, or omitted, giving the behaviour of\n"
 410             "@code{getgrgid}, @code{getgrnam} or @code{getgrent}\n"
 411             "respectively.")
 412 #define FUNC_NAME s_scm_getgrgid
 413 {
 414   struct group *entry;
 415   SCM result = scm_c_make_vector (4, SCM_UNSPECIFIED);
 416
 417   if (SCM_UNBNDP (name) || scm_is_false (name))
 418     {
 419       SCM_SYSCALL (entry = getgrent ());
 420       if (! entry)
 421         {
 422           return SCM_BOOL_F;
 423         }
 424     }
 425   else if (scm_is_integer (name))
 426     SCM_SYSCALL (entry = getgrgid (scm_to_int (name)));
 427   else
 428     STRING_SYSCALL (name, c_name,
 429                     entry = getgrnam (c_name));
 430   if (!entry)
 431     SCM_SYSERROR;
 432
 433   SCM_SIMPLE_VECTOR_SET(result, 0, scm_from_locale_string (entry->gr_name));
 434   SCM_SIMPLE_VECTOR_SET(result, 1, scm_from_locale_string (entry->gr_passwd));
 435   SCM_SIMPLE_VECTOR_SET(result, 2, scm_from_ulong  (entry->gr_gid));
 436   SCM_SIMPLE_VECTOR_SET(result, 3, scm_makfromstrs (-1, entry->gr_mem));
 437   return result;
 438 }
 439 #undef FUNC_NAME
 440
 441
 442
 443 SCM_DEFINE (scm_setgrent, "setgr", 0, 1, 0,
 444             (SCM arg),
 445             "If called with a true argument, initialize or reset the group data\n"
 446             "stream.  Otherwise, close the stream.  The @code{setgrent} and\n"
 447             "@code{endgrent} procedures are implemented on top of this.")
 448 #define FUNC_NAME s_scm_setgrent
 449 {
 450   if (SCM_UNBNDP (arg) || scm_is_false (arg))
 451     endgrent ();
 452   else
 453     setgrent ();
 454   return SCM_UNSPECIFIED;
 455 }
 456 #undef FUNC_NAME
 457 #endif /* HAVE_GETGRENT */
 458
 459
 460 #ifdef HAVE_GETRLIMIT
 461 #ifdef RLIMIT_AS
 462 SCM_SYMBOL (sym_as, "as");
 463 #endif
 464 #ifdef RLIMIT_CORE
 465 SCM_SYMBOL (sym_core, "core");
 466 #endif
 467 #ifdef RLIMIT_CPU
 468 SCM_SYMBOL (sym_cpu, "cpu");
 469 #endif
 470 #ifdef RLIMIT_DATA
 471 SCM_SYMBOL (sym_data, "data");
 472 #endif
 473 #ifdef RLIMIT_FSIZE
 474 SCM_SYMBOL (sym_fsize, "fsize");
 475 #endif
 476 #ifdef RLIMIT_MEMLOCK
 477 SCM_SYMBOL (sym_memlock, "memlock");
 478 #endif
 479 #ifdef RLIMIT_MSGQUEUE
 480 SCM_SYMBOL (sym_msgqueue, "msgqueue");
 481 #endif
 482 #ifdef RLIMIT_NICE
 483 SCM_SYMBOL (sym_nice, "nice");
 484 #endif
 485 #ifdef RLIMIT_NOFILE
 486 SCM_SYMBOL (sym_nofile, "nofile");
 487 #endif
 488 #ifdef RLIMIT_NPROC
 489 SCM_SYMBOL (sym_nproc, "nproc");
 490 #endif
 491 #ifdef RLIMIT_RSS
 492 SCM_SYMBOL (sym_rss, "rss");
 493 #endif
 494 #ifdef RLIMIT_RTPRIO
 495 SCM_SYMBOL (sym_rtprio, "rtprio");
 496 #endif
 497 #ifdef RLIMIT_RTPRIO
 498 SCM_SYMBOL (sym_rttime, "rttime");
 499 #endif
 500 #ifdef RLIMIT_SIGPENDING
 501 SCM_SYMBOL (sym_sigpending, "sigpending");
 502 #endif
 503 #ifdef RLIMIT_STACK
 504 SCM_SYMBOL (sym_stack, "stack");
 505 #endif
 506
 507 static int
 508 scm_to_resource (SCM s, const char *func, int pos)
 509 {
 510   if (scm_is_number (s))
 511     return scm_to_int (s);
 512
 513   SCM_ASSERT_TYPE (scm_is_symbol (s), s, pos, func, "symbol");
 514
 515 #ifdef RLIMIT_AS
 516   if (scm_is_eq (s, sym_as))
 517     return RLIMIT_AS;
 518 #endif
 519 #ifdef RLIMIT_CORE
 520   if (scm_is_eq (s, sym_core))
 521     return RLIMIT_CORE;
 522 #endif
 523 #ifdef RLIMIT_CPU
 524   if (scm_is_eq (s, sym_cpu))
 525     return RLIMIT_CPU;
 526 #endif
 527 #ifdef RLIMIT_DATA
 528   if (scm_is_eq (s, sym_data))
 529     return RLIMIT_DATA;
 530 #endif
 531 #ifdef RLIMIT_FSIZE
 532   if (scm_is_eq (s, sym_fsize))
 533     return RLIMIT_FSIZE;
 534 #endif
 535 #ifdef RLIMIT_MEMLOCK
 536   if (scm_is_eq (s, sym_memlock))
 537     return RLIMIT_MEMLOCK;
 538 #endif
 539 #ifdef RLIMIT_MSGQUEUE
 540   if (scm_is_eq (s, sym_msgqueue))
 541     return RLIMIT_MSGQUEUE;
 542 #endif
 543 #ifdef RLIMIT_NICE
 544   if (scm_is_eq (s, sym_nice))
 545     return RLIMIT_NICE;
 546 #endif
 547 #ifdef RLIMIT_NOFILE
 548   if (scm_is_eq (s, sym_nofile))
 549     return RLIMIT_NOFILE;
 550 #endif
 551 #ifdef RLIMIT_NPROC
 552   if (scm_is_eq (s, sym_nproc))
 553     return RLIMIT_NPROC;
 554 #endif
 555 #ifdef RLIMIT_RSS
 556   if (scm_is_eq (s, sym_rss))
 557     return RLIMIT_RSS;
 558 #endif
 559 #ifdef RLIMIT_RTPRIO
 560   if (scm_is_eq (s, sym_rtprio))
 561     return RLIMIT_RTPRIO;
 562 #endif
 563 #ifdef RLIMIT_RTPRIO
 564   if (scm_is_eq (s, sym_rttime))
 565     return RLIMIT_RTPRIO;
 566 #endif
 567 #ifdef RLIMIT_SIGPENDING
 568   if (scm_is_eq (s, sym_sigpending))
 569     return RLIMIT_SIGPENDING;
 570 #endif
 571 #ifdef RLIMIT_STACK
 572   if (scm_is_eq (s, sym_stack))
 573     return RLIMIT_STACK;
 574 #endif
 575
 576   scm_misc_error (func, "invalid rlimit resource ~A", scm_list_1 (s));
 577   return 0;
 578 }
 579
 580 SCM_DEFINE (scm_getrlimit, "getrlimit", 1, 0, 0,
 581             (SCM resource),
 582             "Get a resource limit for this process. @var{resource} identifies the resource,\n"
 583             "either as an integer or as a symbol. For example, @code{(getrlimit 'stack)}\n"
 584             "gets the limits associated with @code{RLIMIT_STACK}.\n\n"
 585             "@code{getrlimit} returns two values, the soft and the hard limit. If no\n"
 586             "limit is set for the resource in question, the returned limit will be @code{#f}.")
 587 #define FUNC_NAME s_scm_getrlimit
 588 {
 589   int iresource;
 590   struct rlimit lim = { 0, 0 };
 591
 592   iresource = scm_to_resource (resource, FUNC_NAME, 1);
 593
 594   if (getrlimit (iresource, &lim) != 0)
 595     scm_syserror (FUNC_NAME);
 596
 597   return scm_values (scm_list_2 ((lim.rlim_cur == RLIM_INFINITY) ? SCM_BOOL_F
 598                                  : scm_from_long (lim.rlim_cur),
 599                                  (lim.rlim_max == RLIM_INFINITY) ? SCM_BOOL_F
 600                                  : scm_from_long (lim.rlim_max)));
 601 }
 602 #undef FUNC_NAME
 603
 604
 605 #ifdef HAVE_SETRLIMIT
 606 SCM_DEFINE (scm_setrlimit, "setrlimit", 3, 0, 0,
 607             (SCM resource, SCM soft, SCM hard),
 608             "Set a resource limit for this process. @var{resource} identifies the resource,\n"
 609             "either as an integer or as a symbol. @var{soft} and @var{hard} should be integers,\n"
 610             "or @code{#f} to indicate no limit (i.e., @code{RLIM_INFINITY}).\n\n"
 611             "For example, @code{(setrlimit 'stack 150000 300000)} sets the @code{RLIMIT_STACK}\n"
 612             "limit to 150 kilobytes, with a hard limit of 300 kB.")
 613 #define FUNC_NAME s_scm_setrlimit
 614 {
 615   int iresource;
 616   struct rlimit lim = { 0, 0 };
 617
 618   iresource = scm_to_resource (resource, FUNC_NAME, 1);
 619
 620   lim.rlim_cur = scm_is_false (soft) ? RLIM_INFINITY : scm_to_long (soft);
 621   lim.rlim_max = scm_is_false (hard) ? RLIM_INFINITY : scm_to_long (hard);
 622
 623   if (setrlimit (iresource, &lim) != 0)
 624     scm_syserror (FUNC_NAME);
 625
 626   return SCM_UNSPECIFIED;
 627 }
 628 #undef FUNC_NAME
 629 #endif /* HAVE_SETRLIMIT */
 630 #endif /* HAVE_GETRLIMIT */
 631
 632
 633 SCM_DEFINE (scm_kill, "kill", 2, 0, 0,
 634             (SCM pid, SCM sig),
 635             "Sends a signal to the specified process or group of processes.\n\n"
 636             "@var{pid} specifies the processes to which the signal is sent:\n\n"
 637             "@table @r\n"
 638             "@item @var{pid} greater than 0\n"
 639             "The process whose identifier is @var{pid}.\n"
 640             "@item @var{pid} equal to 0\n"
 641             "All processes in the current process group.\n"
 642             "@item @var{pid} less than -1\n"
 643             "The process group whose identifier is -@var{pid}\n"
 644             "@item @var{pid} equal to -1\n"
 645             "If the process is privileged, all processes except for some special\n"
 646             "system processes.  Otherwise, all processes with the current effective\n"
 647             "user ID.\n"
 648             "@end table\n\n"
 649             "@var{sig} should be specified using a variable corresponding to\n"
 650             "the Unix symbolic name, e.g.,\n\n"
 651             "@defvar SIGHUP\n"
 652             "Hang-up signal.\n"
 653             "@end defvar\n\n"
 654             "@defvar SIGINT\n"
 655             "Interrupt signal.\n"
 656             "@end defvar")
 657 #define FUNC_NAME s_scm_kill
 658 {
 659   /* Signal values are interned in scm_init_posix().  */
 660 #ifdef HAVE_KILL
 661   if (kill (scm_to_int (pid), scm_to_int  (sig)) != 0)
 662     SCM_SYSERROR;
 663 #else
 664   /* Mingw has raise(), but not kill().  (Other raw DOS environments might
 665      be similar.)  Use raise() when the requested pid is our own process,
 666      otherwise bomb.  */
 667   if (scm_to_int (pid) == getpid ())
 668     {
 669       if (raise (scm_to_int (sig)) != 0)
 670         {
 671         err:
 672           SCM_SYSERROR;
 673         }
 674       else
 675         {
 676           errno = ENOSYS;
 677           goto err;
 678         }
 679     }
 680 #endif
 681   return SCM_UNSPECIFIED;
 682 }
 683 #undef FUNC_NAME
 684
 685 #ifdef HAVE_WAITPID
 686 SCM_DEFINE (scm_waitpid, "waitpid", 1, 1, 0,
 687             (SCM pid, SCM options),
 688             "This procedure collects status information from a child process which\n"
 689             "has terminated or (optionally) stopped.  Normally it will\n"
 690             "suspend the calling process until this can be done.  If more than one\n"
 691             "child process is eligible then one will be chosen by the operating system.\n\n"
 692             "The value of @var{pid} determines the behaviour:\n\n"
 693             "@table @r\n"
 694             "@item @var{pid} greater than 0\n"
 695             "Request status information from the specified child process.\n"
 696             "@item @var{pid} equal to -1 or WAIT_ANY\n"
 697             "Request status information for any child process.\n"
 698             "@item @var{pid} equal to 0 or WAIT_MYPGRP\n"
 699             "Request status information for any child process in the current process\n"
 700             "group.\n"
 701             "@item @var{pid} less than -1\n"
 702             "Request status information for any child process whose process group ID\n"
 703             "is -@var{pid}.\n"
 704             "@end table\n\n"
 705             "The @var{options} argument, if supplied, should be the bitwise OR of the\n"
 706             "values of zero or more of the following variables:\n\n"
 707             "@defvar WNOHANG\n"
 708             "Return immediately even if there are no child processes to be collected.\n"
 709             "@end defvar\n\n"
 710             "@defvar WUNTRACED\n"
 711             "Report status information for stopped processes as well as terminated\n"
 712             "processes.\n"
 713             "@end defvar\n\n"
 714             "The return value is a pair containing:\n\n"
 715             "@enumerate\n"
 716             "@item\n"
 717             "The process ID of the child process, or 0 if @code{WNOHANG} was\n"
 718             "specified and no process was collected.\n"
 719             "@item\n"
 720             "The integer status value.\n"
 721             "@end enumerate")
 722 #define FUNC_NAME s_scm_waitpid
 723 {
 724   int i;
 725   int status;
 726   int ioptions;
 727   if (SCM_UNBNDP (options))
 728     ioptions = 0;
 729   else
 730     {
 731       /* Flags are interned in scm_init_posix.  */
 732       ioptions = scm_to_int (options);
 733     }
 734   SCM_SYSCALL (i = waitpid (scm_to_int (pid), &status, ioptions));
 735   if (i == -1)
 736     SCM_SYSERROR;
 737   return scm_cons (scm_from_int (i), scm_from_int (status));
 738 }
 739 #undef FUNC_NAME
 740 #endif /* HAVE_WAITPID */
 741
 742 #ifndef __MINGW32__
 743 SCM_DEFINE (scm_status_exit_val, "status:exit-val", 1, 0, 0,
 744             (SCM status),
 745             "Return the exit status value, as would be set if a process\n"
 746             "ended normally through a call to @code{exit} or @code{_exit},\n"
 747             "if any, otherwise @code{#f}.")
 748 #define FUNC_NAME s_scm_status_exit_val
 749 {
 750   int lstatus;
 751
 752   /* On Ultrix, the WIF... macros assume their argument is an lvalue;
 753      go figure.  */
 754   lstatus = scm_to_int (status);
 755   if (WIFEXITED (lstatus))
 756     return (scm_from_int (WEXITSTATUS (lstatus)));
 757   else
 758     return SCM_BOOL_F;
 759 }
 760 #undef FUNC_NAME
 761
 762 SCM_DEFINE (scm_status_term_sig, "status:term-sig", 1, 0, 0,
 763             (SCM status),
 764             "Return the signal number which terminated the process, if any,\n"
 765             "otherwise @code{#f}.")
 766 #define FUNC_NAME s_scm_status_term_sig
 767 {
 768   int lstatus;
 769
 770   lstatus = scm_to_int (status);
 771   if (WIFSIGNALED (lstatus))
 772     return scm_from_int (WTERMSIG (lstatus));
 773   else
 774     return SCM_BOOL_F;
 775 }
 776 #undef FUNC_NAME
 777
 778 SCM_DEFINE (scm_status_stop_sig, "status:stop-sig", 1, 0, 0,
 779             (SCM status),
 780             "Return the signal number which stopped the process, if any,\n"
 781             "otherwise @code{#f}.")
 782 #define FUNC_NAME s_scm_status_stop_sig
 783 {
 784   int lstatus;
 785
 786   lstatus = scm_to_int (status);
 787   if (WIFSTOPPED (lstatus))
 788     return scm_from_int (WSTOPSIG (lstatus));
 789   else
 790     return SCM_BOOL_F;
 791 }
 792 #undef FUNC_NAME
 793 #endif /* __MINGW32__ */
 794
 795 #ifdef HAVE_GETPPID
 796 SCM_DEFINE (scm_getppid, "getppid", 0, 0, 0,
 797             (),
 798             "Return an integer representing the process ID of the parent\n"
 799             "process.")
 800 #define FUNC_NAME s_scm_getppid
 801 {
 802   return scm_from_int (getppid ());
 803 }
 804 #undef FUNC_NAME
 805 #endif /* HAVE_GETPPID */
 806
 807
 808 #ifndef __MINGW32__
 809 SCM_DEFINE (scm_getuid, "getuid", 0, 0, 0,
 810             (),
 811             "Return an integer representing the current real user ID.")
 812 #define FUNC_NAME s_scm_getuid
 813 {
 814   return scm_from_int (getuid ());
 815 }
 816 #undef FUNC_NAME
 817
 818
 819
 820 SCM_DEFINE (scm_getgid, "getgid", 0, 0, 0,
 821             (),
 822             "Return an integer representing the current real group ID.")
 823 #define FUNC_NAME s_scm_getgid
 824 {
 825   return scm_from_int (getgid ());
 826 }
 827 #undef FUNC_NAME
 828
 829
 830
 831 SCM_DEFINE (scm_geteuid, "geteuid", 0, 0, 0,
 832             (),
 833             "Return an integer representing the current effective user ID.\n"
 834             "If the system does not support effective IDs, then the real ID\n"
 835             "is returned.  @code{(provided? 'EIDs)} reports whether the\n"
 836             "system supports effective IDs.")
 837 #define FUNC_NAME s_scm_geteuid
 838 {
 839 #ifdef HAVE_GETEUID
 840   return scm_from_int (geteuid ());
 841 #else
 842   return scm_from_int (getuid ());
 843 #endif
 844 }
 845 #undef FUNC_NAME
 846
 847
 848 SCM_DEFINE (scm_getegid, "getegid", 0, 0, 0,
 849             (),
 850             "Return an integer representing the current effective group ID.\n"
 851             "If the system does not support effective IDs, then the real ID\n"
 852             "is returned.  @code{(provided? 'EIDs)} reports whether the\n"
 853             "system supports effective IDs.")
 854 #define FUNC_NAME s_scm_getegid
 855 {
 856 #ifdef HAVE_GETEUID
 857   return scm_from_int (getegid ());
 858 #else
 859   return scm_from_int (getgid ());
 860 #endif
 861 }
 862 #undef FUNC_NAME
 863
 864
 865 SCM_DEFINE (scm_setuid, "setuid", 1, 0, 0,
 866             (SCM id),
 867             "Sets both the real and effective user IDs to the integer @var{id}, provided\n"
 868             "the process has appropriate privileges.\n"
 869             "The return value is unspecified.")
 870 #define FUNC_NAME s_scm_setuid
 871 {
 872   if (setuid (scm_to_int (id)) != 0)
 873     SCM_SYSERROR;
 874   return SCM_UNSPECIFIED;
 875 }
 876 #undef FUNC_NAME
 877
 878 SCM_DEFINE (scm_setgid, "setgid", 1, 0, 0,
 879             (SCM id),
 880             "Sets both the real and effective group IDs to the integer @var{id}, provided\n"
 881             "the process has appropriate privileges.\n"
 882             "The return value is unspecified.")
 883 #define FUNC_NAME s_scm_setgid
 884 {
 885   if (setgid (scm_to_int (id)) != 0)
 886     SCM_SYSERROR;
 887   return SCM_UNSPECIFIED;
 888 }
 889 #undef FUNC_NAME
 890
 891 SCM_DEFINE (scm_seteuid, "seteuid", 1, 0, 0,
 892             (SCM id),
 893             "Sets the effective user ID to the integer @var{id}, provided the process\n"
 894             "has appropriate privileges.  If effective IDs are not supported, the\n"
 895             "real ID is set instead -- @code{(provided? 'EIDs)} reports whether the\n"
 896             "system supports effective IDs.\n"
 897             "The return value is unspecified.")
 898 #define FUNC_NAME s_scm_seteuid
 899 {
 900   int rv;
 901
 902 #ifdef HAVE_SETEUID
 903   rv = seteuid (scm_to_int (id));
 904 #else
 905   rv = setuid (scm_to_int (id));
 906 #endif
 907   if (rv != 0)
 908     SCM_SYSERROR;
 909   return SCM_UNSPECIFIED;
 910 }
 911 #undef FUNC_NAME
 912 #endif /* __MINGW32__ */
 913
 914
 915 #ifdef HAVE_SETEGID
 916 SCM_DEFINE (scm_setegid, "setegid", 1, 0, 0,
 917             (SCM id),
 918             "Sets the effective group ID to the integer @var{id}, provided the process\n"
 919             "has appropriate privileges.  If effective IDs are not supported, the\n"
 920             "real ID is set instead -- @code{(provided? 'EIDs)} reports whether the\n"
 921             "system supports effective IDs.\n"
 922             "The return value is unspecified.")
 923 #define FUNC_NAME s_scm_setegid
 924 {
 925   int rv;
 926
 927 #ifdef HAVE_SETEUID
 928   rv = setegid (scm_to_int (id));
 929 #else
 930   rv = setgid (scm_to_int (id));
 931 #endif
 932   if (rv != 0)
 933     SCM_SYSERROR;
 934   return SCM_UNSPECIFIED;
 935
 936 }
 937 #undef FUNC_NAME
 938 #endif
 939
 940
 941 #ifdef HAVE_GETPGRP
 942 SCM_DEFINE (scm_getpgrp, "getpgrp", 0, 0, 0,
 943             (),
 944             "Return an integer representing the current process group ID.\n"
 945             "This is the POSIX definition, not BSD.")
 946 #define FUNC_NAME s_scm_getpgrp
 947 {
 948   int (*fn)();
 949   fn = (int (*) ()) getpgrp;
 950   return scm_from_int (fn (0));
 951 }
 952 #undef FUNC_NAME
 953 #endif /* HAVE_GETPGRP */
 954
 955
 956 #ifdef HAVE_SETPGID
 957 SCM_DEFINE (scm_setpgid, "setpgid", 2, 0, 0,
 958             (SCM pid, SCM pgid),
 959             "Move the process @var{pid} into the process group @var{pgid}.  @var{pid} or\n"
 960             "@var{pgid} must be integers: they can be zero to indicate the ID of the\n"
 961             "current process.\n"
 962             "Fails on systems that do not support job control.\n"
 963             "The return value is unspecified.")
 964 #define FUNC_NAME s_scm_setpgid
 965 {
 966   /* FIXME(?): may be known as setpgrp.  */
 967   if (setpgid (scm_to_int (pid), scm_to_int (pgid)) != 0)
 968     SCM_SYSERROR;
 969   return SCM_UNSPECIFIED;
 970 }
 971 #undef FUNC_NAME
 972 #endif /* HAVE_SETPGID */
 973
 974 #ifdef HAVE_SETSID
 975 SCM_DEFINE (scm_setsid, "setsid", 0, 0, 0,
 976             (),
 977             "Creates a new session.  The current process becomes the session leader\n"
 978             "and is put in a new process group.  The process will be detached\n"
 979             "from its controlling terminal if it has one.\n"
 980             "The return value is an integer representing the new process group ID.")
 981 #define FUNC_NAME s_scm_setsid
 982 {
 983   pid_t sid = setsid ();
 984   if (sid == -1)
 985     SCM_SYSERROR;
 986   return SCM_UNSPECIFIED;
 987 }
 988 #undef FUNC_NAME
 989 #endif /* HAVE_SETSID */
 990
 991 #ifdef HAVE_GETSID
 992 SCM_DEFINE (scm_getsid, "getsid", 1, 0, 0,
 993             (SCM pid),
 994             "Returns the session ID of process @var{pid}.  (The session\n"
 995             "ID of a process is the process group ID of its session leader.)")
 996 #define FUNC_NAME s_scm_getsid
 997 {
 998   return scm_from_int (getsid (scm_to_int (pid)));
 999 }
1000 #undef FUNC_NAME
1001 #endif /* HAVE_GETSID */
1002
1003
1004 /* ttyname returns its result in a single static buffer, hence
1005    scm_i_misc_mutex for thread safety.  In glibc 2.3.2 two threads
1006    continuously calling ttyname will otherwise get an overwrite quite
1007    easily.
1008
1009    ttyname_r (when available) could be used instead of scm_i_misc_mutex, but
1010    there's probably little to be gained in either speed or parallelism.  */
1011
1012 #ifdef HAVE_TTYNAME
1013 SCM_DEFINE (scm_ttyname, "ttyname", 1, 0, 0,
1014             (SCM port),
1015             "Return a string with the name of the serial terminal device\n"
1016             "underlying @var{port}.")
1017 #define FUNC_NAME s_scm_ttyname
1018 {
1019   char *result;
1020   int fd, err;
1021   SCM ret = SCM_BOOL_F;
1022
1023   port = SCM_COERCE_OUTPORT (port);
1024   SCM_VALIDATE_OPPORT (1, port);
1025   if (!SCM_FPORTP (port))
1026     return SCM_BOOL_F;
1027   fd = SCM_FPORT_FDES (port);
1028
1029   scm_i_scm_pthread_mutex_lock (&scm_i_misc_mutex);
1030
1031   SCM_SYSCALL (result = ttyname (fd));
1032   err = errno;
1033   if (result != NULL)
1034     result = strdup (result);
1035
1036   scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
1037
1038   if (!result)
1039     {
1040       errno = err;
1041       SCM_SYSERROR;
1042     }
1043   else
1044     ret = scm_take_locale_string (result);
1045
1046   return ret;
1047 }
1048 #undef FUNC_NAME
1049 #endif /* HAVE_TTYNAME */
1050
1051
1052 /* For thread safety "buf" is used instead of NULL for the ctermid static
1053    buffer.  Actually it's unlikely the controlling terminal will change
1054    during program execution, and indeed on glibc (2.3.2) it's always just
1055    "/dev/tty", but L_ctermid on the stack is easy and fast and guarantees
1056    safety everywhere.  */
1057 #ifdef HAVE_CTERMID
1058 SCM_DEFINE (scm_ctermid, "ctermid", 0, 0, 0,
1059             (),
1060             "Return a string containing the file name of the controlling\n"
1061             "terminal for the current process.")
1062 #define FUNC_NAME s_scm_ctermid
1063 {
1064   char buf[L_ctermid];
1065   char *result = ctermid (buf);
1066   if (*result == '\0')
1067     SCM_SYSERROR;
1068   return scm_from_locale_string (result);
1069 }
1070 #undef FUNC_NAME
1071 #endif /* HAVE_CTERMID */
1072
1073 #ifdef HAVE_TCGETPGRP
1074 SCM_DEFINE (scm_tcgetpgrp, "tcgetpgrp", 1, 0, 0,
1075             (SCM port),
1076             "Return the process group ID of the foreground process group\n"
1077             "associated with the terminal open on the file descriptor\n"
1078             "underlying @var{port}.\n"
1079             "\n"
1080             "If there is no foreground process group, the return value is a\n"
1081             "number greater than 1 that does not match the process group ID\n"
1082             "of any existing process group.  This can happen if all of the\n"
1083             "processes in the job that was formerly the foreground job have\n"
1084             "terminated, and no other job has yet been moved into the\n"
1085             "foreground.")
1086 #define FUNC_NAME s_scm_tcgetpgrp
1087 {
1088   int fd;
1089   pid_t pgid;
1090
1091   port = SCM_COERCE_OUTPORT (port);
1092
1093   SCM_VALIDATE_OPFPORT (1, port);
1094   fd = SCM_FPORT_FDES (port);
1095   if ((pgid = tcgetpgrp (fd)) == -1)
1096     SCM_SYSERROR;
1097   return scm_from_int (pgid);
1098 }
1099 #undef FUNC_NAME
1100 #endif /* HAVE_TCGETPGRP */
1101
1102 #ifdef HAVE_TCSETPGRP
1103 SCM_DEFINE (scm_tcsetpgrp, "tcsetpgrp", 2, 0, 0,
1104             (SCM port, SCM pgid),
1105             "Set the foreground process group ID for the terminal used by the file\n"
1106             "descriptor underlying @var{port} to the integer @var{pgid}.\n"
1107             "The calling process\n"
1108             "must be a member of the same session as @var{pgid} and must have the same\n"
1109             "controlling terminal.  The return value is unspecified.")
1110 #define FUNC_NAME s_scm_tcsetpgrp
1111 {
1112   int fd;
1113
1114   port = SCM_COERCE_OUTPORT (port);
1115
1116   SCM_VALIDATE_OPFPORT (1, port);
1117   fd = SCM_FPORT_FDES (port);
1118   if (tcsetpgrp (fd, scm_to_int (pgid)) == -1)
1119     SCM_SYSERROR;
1120   return SCM_UNSPECIFIED;
1121 }
1122 #undef FUNC_NAME
1123 #endif /* HAVE_TCSETPGRP */
1124
1125 SCM_DEFINE (scm_execl, "execl", 1, 0, 1,
1126             (SCM filename, SCM args),
1127             "Executes the file named by @var{filename} as a new process image.\n"
1128             "The remaining arguments are supplied to the process; from a C program\n"
1129             "they are accessible as the @code{argv} argument to @code{main}.\n"
1130             "Conventionally the first @var{arg} is the same as @var{filename}.\n"
1131             "All arguments must be strings.\n\n"
1132             "If @var{arg} is missing, @var{path} is executed with a null\n"
1133             "argument list, which may have system-dependent side-effects.\n\n"
1134             "This procedure is currently implemented using the @code{execv} system\n"
1135             "call, but we call it @code{execl} because of its Scheme calling interface.")
1136 #define FUNC_NAME s_scm_execl
1137 {
1138   char *exec_file;
1139   char **exec_argv;
1140
1141   scm_dynwind_begin (0);
1142
1143   exec_file = scm_to_locale_string (filename);
1144   scm_dynwind_free (exec_file);
1145
1146   exec_argv = scm_i_allocate_string_pointers (args);
1147
1148   execv (exec_file,
1149 #ifdef __MINGW32__
1150          /* extra "const" in mingw formals, provokes warning from gcc */
1151          (const char * const *)
1152 #endif
1153          exec_argv);
1154   SCM_SYSERROR;
1155
1156   /* not reached.  */
1157   scm_dynwind_end ();
1158   return SCM_BOOL_F;
1159 }
1160 #undef FUNC_NAME
1161
1162 SCM_DEFINE (scm_execlp, "execlp", 1, 0, 1,
1163             (SCM filename, SCM args),
1164             "Similar to @code{execl}, however if\n"
1165             "@var{filename} does not contain a slash\n"
1166             "then the file to execute will be located by searching the\n"
1167             "directories listed in the @code{PATH} environment variable.\n\n"
1168             "This procedure is currently implemented using the @code{execvp} system\n"
1169             "call, but we call it @code{execlp} because of its Scheme calling interface.")
1170 #define FUNC_NAME s_scm_execlp
1171 {
1172   char *exec_file;
1173   char **exec_argv;
1174
1175   scm_dynwind_begin (0);
1176
1177   exec_file = scm_to_locale_string (filename);
1178   scm_dynwind_free (exec_file);
1179
1180   exec_argv = scm_i_allocate_string_pointers (args);
1181
1182   execvp (exec_file,
1183 #ifdef __MINGW32__
1184           /* extra "const" in mingw formals, provokes warning from gcc */
1185           (const char * const *)
1186 #endif
1187           exec_argv);
1188   SCM_SYSERROR;
1189
1190   /* not reached.  */
1191   scm_dynwind_end ();
1192   return SCM_BOOL_F;
1193 }
1194 #undef FUNC_NAME
1195
1196
1197 /* OPTIMIZE-ME: scm_execle doesn't need malloced copies of the environment
1198    list strings the way environ_list_to_c gives.  */
1199
1200 SCM_DEFINE (scm_execle, "execle", 2, 0, 1,
1201             (SCM filename, SCM env, SCM args),
1202             "Similar to @code{execl}, but the environment of the new process is\n"
1203             "specified by @var{env}, which must be a list of strings as returned by the\n"
1204             "@code{environ} procedure.\n\n"
1205             "This procedure is currently implemented using the @code{execve} system\n"
1206             "call, but we call it @code{execle} because of its Scheme calling interface.")
1207 #define FUNC_NAME s_scm_execle
1208 {
1209   char **exec_argv;
1210   char **exec_env;
1211   char *exec_file;
1212
1213   scm_dynwind_begin (0);
1214
1215   exec_file = scm_to_locale_string (filename);
1216   scm_dynwind_free (exec_file);
1217
1218   exec_argv = scm_i_allocate_string_pointers (args);
1219   exec_env = scm_i_allocate_string_pointers (env);
1220
1221   execve (exec_file,
1222 #ifdef __MINGW32__
1223           /* extra "const" in mingw formals, provokes warning from gcc */
1224           (const char * const *)
1225 #endif
1226           exec_argv,
1227 #ifdef __MINGW32__
1228           /* extra "const" in mingw formals, provokes warning from gcc */
1229           (const char * const *)
1230 #endif
1231           exec_env);
1232   SCM_SYSERROR;
1233
1234   /* not reached.  */
1235   scm_dynwind_end ();
1236   return SCM_BOOL_F;
1237 }
1238 #undef FUNC_NAME
1239
1240 #ifdef HAVE_FORK
1241 SCM_DEFINE (scm_fork, "primitive-fork", 0, 0, 0,
1242             (),
1243             "Creates a new \"child\" process by duplicating the current \"parent\" process.\n"
1244             "In the child the return value is 0.  In the parent the return value is\n"
1245             "the integer process ID of the child.\n\n"
1246             "This procedure has been renamed from @code{fork} to avoid a naming conflict\n"
1247             "with the scsh fork.")
1248 #define FUNC_NAME s_scm_fork
1249 {
1250   int pid;
1251   pid = fork ();
1252   if (pid == -1)
1253     SCM_SYSERROR;
1254   return scm_from_int (pid);
1255 }
1256 #undef FUNC_NAME
1257
1258 /* Since Guile uses threads, we have to be very careful to avoid calling
1259    functions that are not async-signal-safe in the child.  That's why
1260    this function is implemented in C.  */
1261 static SCM
1262 scm_open_process (SCM mode, SCM prog, SCM args)
1263 #define FUNC_NAME "open-process"
1264 {
1265   long mode_bits;
1266   int reading, writing;
1267   int c2p[2]; /* Child to parent.  */
1268   int p2c[2]; /* Parent to child.  */
1269   int in = -1, out = -1, err = -1;
1270   int pid;
1271   char *exec_file;
1272   char **exec_argv;
1273   int max_fd = 1024;
1274
1275   exec_file = scm_to_locale_string (prog);
1276   exec_argv = scm_i_allocate_string_pointers (scm_cons (prog, args));
1277
1278   mode_bits = scm_i_mode_bits (mode);
1279   reading = mode_bits & SCM_RDNG;
1280   writing = mode_bits & SCM_WRTNG;
1281
1282   if (reading)
1283     {
1284       if (pipe (c2p))
1285         {
1286           int errno_save = errno;
1287           free (exec_file);
1288           errno = errno_save;
1289           SCM_SYSERROR;
1290         }
1291       out = c2p[1];
1292     }
1293
1294   if (writing)
1295     {
1296       if (pipe (p2c))
1297         {
1298           int errno_save = errno;
1299           free (exec_file);
1300           if (reading)
1301             {
1302               close (c2p[0]);
1303               close (c2p[1]);
1304             }
1305           errno = errno_save;
1306           SCM_SYSERROR;
1307         }
1308       in = p2c[0];
1309     }
1310
1311   {
1312     SCM port;
1313
1314     if (SCM_OPOUTFPORTP ((port = scm_current_error_port ())))
1315       err = SCM_FPORT_FDES (port);
1316     if (out == -1 && SCM_OPOUTFPORTP ((port = scm_current_output_port ())))
1317       out = SCM_FPORT_FDES (port);
1318     if (in == -1 && SCM_OPINFPORTP ((port = scm_current_input_port ())))
1319       in = SCM_FPORT_FDES (port);
1320   }
1321
1322 #if defined (HAVE_GETRLIMIT) && defined (RLIMIT_NOFILE)
1323   {
1324     struct rlimit lim = { 0, 0 };
1325     if (getrlimit (RLIMIT_NOFILE, &lim) == 0)
1326       max_fd = lim.rlim_cur;
1327   }
1328 #endif
1329
1330   pid = fork ();
1331
1332   if (pid == -1)
1333     {
1334       int errno_save = errno;
1335       free (exec_file);
1336       if (reading)
1337         {
1338           close (c2p[0]);
1339           close (c2p[1]);
1340         }
1341       if (writing)
1342         {
1343           close (p2c[0]);
1344           close (p2c[1]);
1345         }
1346       errno = errno_save;
1347       SCM_SYSERROR;
1348     }
1349
1350   if (pid)
1351     /* Parent. */
1352     {
1353       SCM read_port = SCM_BOOL_F, write_port = SCM_BOOL_F, port;
1354
1355       /* There is no sense in catching errors on close().  */
1356       if (reading)
1357         {
1358           close (c2p[1]);
1359           read_port = scm_fdes_to_port (c2p[0], "r", sym_read_pipe);
1360           scm_setvbuf (read_port, scm_from_int (_IONBF), SCM_UNDEFINED);
1361         }
1362       if (writing)
1363         {
1364           close (p2c[0]);
1365           write_port = scm_fdes_to_port (p2c[1], "w", sym_write_pipe);
1366           scm_setvbuf (write_port, scm_from_int (_IONBF), SCM_UNDEFINED);
1367         }
1368
1369       if (reading && writing)
1370         {
1371           static SCM make_rw_port = SCM_BOOL_F;
1372
1373           if (scm_is_false (make_rw_port))
1374             make_rw_port = scm_c_private_variable ("ice-9 popen",
1375                                                    "make-rw-port");
1376
1377           port = scm_call_2 (scm_variable_ref (make_rw_port),
1378                              read_port, write_port);
1379         }
1380       else if (reading)
1381         port = read_port;
1382       else if (writing)
1383         port = write_port;
1384       else
1385         port = scm_sys_make_void_port (mode);
1386
1387       return scm_cons (port, scm_from_int (pid));
1388     }
1389
1390   /* The child.  */
1391   if (reading)
1392     close (c2p[0]);
1393   if (writing)
1394     close (p2c[1]);
1395
1396   /* Close all file descriptors in ports inherited from the parent
1397      except for in, out, and err.  Heavy-handed, but robust.  */
1398   while (max_fd--)
1399     if (max_fd != in && max_fd != out && max_fd != err)
1400       close (max_fd);
1401
1402   /* Ignore errors on these open() calls.  */
1403   if (in == -1)
1404     in = open ("/dev/null", O_RDONLY);
1405   if (out == -1)
1406     out = open ("/dev/null", O_WRONLY);
1407   if (err == -1)
1408     err = open ("/dev/null", O_WRONLY);
1409
1410   if (in > 0)
1411     {
1412       if (out == 0)
1413         do out = dup (out); while (errno == EINTR);
1414       if (err == 0)
1415         do err = dup (err); while (errno == EINTR);
1416       do dup2 (in, 0); while (errno == EINTR);
1417       close (in);
1418     }
1419   if (out > 1)
1420     {
1421       if (err == 1)
1422         do err = dup (err); while (errno == EINTR);
1423       do dup2 (out, 1); while (errno == EINTR);
1424       close (out);
1425     }
1426   if (err > 2)
1427     {
1428       do dup2 (err, 2); while (errno == EINTR);
1429       close (err);
1430     }
1431
1432   execvp (exec_file,
1433 #ifdef __MINGW32__
1434           /* extra "const" in mingw formals, provokes warning from gcc */
1435           (const char * const *)
1436 #endif
1437           exec_argv);
1438
1439   /* The exec failed!  There is nothing sensible to do.  */
1440   if (err > 0)
1441     {
1442       char *msg = strerror (errno);
1443       fprintf (fdopen (err, "a"), "In execlp of %s: %s\n",
1444                exec_file, msg);
1445     }
1446
1447   _exit (EXIT_FAILURE);
1448   /* Not reached.  */
1449   return SCM_BOOL_F;
1450 }
1451 #undef FUNC_NAME
1452 #endif /* HAVE_FORK */
1453
1454 #ifdef __MINGW32__
1455 # include "win32-uname.h"
1456 #endif
1457
1458 #if defined (HAVE_UNAME) || defined (__MINGW32__)
1459 SCM_DEFINE (scm_uname, "uname", 0, 0, 0,
1460             (),
1461             "Return an object with some information about the computer\n"
1462             "system the program is running on.")
1463 #define FUNC_NAME s_scm_uname
1464 {
1465   struct utsname buf;
1466   SCM result = scm_c_make_vector (5, SCM_UNSPECIFIED);
1467   if (uname (&buf) < 0)
1468     SCM_SYSERROR;
1469   SCM_SIMPLE_VECTOR_SET(result, 0, scm_from_locale_string (buf.sysname));
1470   SCM_SIMPLE_VECTOR_SET(result, 1, scm_from_locale_string (buf.nodename));
1471   SCM_SIMPLE_VECTOR_SET(result, 2, scm_from_locale_string (buf.release));
1472   SCM_SIMPLE_VECTOR_SET(result, 3, scm_from_locale_string (buf.version));
1473   SCM_SIMPLE_VECTOR_SET(result, 4, scm_from_locale_string (buf.machine));
1474 /*
1475    a linux special?
1476   SCM_SIMPLE_VECTOR_SET(result, 5, scm_from_locale_string (buf.domainname));
1477 */
1478   return result;
1479 }
1480 #undef FUNC_NAME
1481 #endif /* HAVE_UNAME */
1482
1483 SCM_DEFINE (scm_environ, "environ", 0, 1, 0,
1484             (SCM env),
1485             "If @var{env} is omitted, return the current environment (in the\n"
1486             "Unix sense) as a list of strings.  Otherwise set the current\n"
1487             "environment, which is also the default environment for child\n"
1488             "processes, to the supplied list of strings.  Each member of\n"
1489             "@var{env} should be of the form @code{NAME=VALUE} and values of\n"
1490             "@code{NAME} should not be duplicated.  If @var{env} is supplied\n"
1491             "then the return value is unspecified.")
1492 #define FUNC_NAME s_scm_environ
1493 {
1494   if (SCM_UNBNDP (env))
1495     return scm_makfromstrs (-1, environ);
1496   else
1497     {
1498       environ = scm_i_allocate_string_pointers (env);
1499       return SCM_UNSPECIFIED;
1500     }
1501 }
1502 #undef FUNC_NAME
1503
1504 #ifdef L_tmpnam
1505
1506 SCM_DEFINE (scm_tmpnam, "tmpnam", 0, 0, 0,
1507             (),
1508             "Return a name in the file system that does not match any\n"
1509             "existing file.  However there is no guarantee that another\n"
1510             "process will not create the file after @code{tmpnam} is called.\n"
1511             "Care should be taken if opening the file, e.g., use the\n"
1512             "@code{O_EXCL} open flag or use @code{mkstemp!} instead.")
1513 #define FUNC_NAME s_scm_tmpnam
1514 {
1515   char name[L_tmpnam];
1516   char *rv;
1517
1518   SCM_SYSCALL (rv = tmpnam (name));
1519   if (rv == NULL)
1520     /* not SCM_SYSERROR since errno probably not set.  */
1521     SCM_MISC_ERROR ("tmpnam failed", SCM_EOL);
1522   return scm_from_locale_string (name);
1523 }
1524 #undef FUNC_NAME
1525
1526 #endif
1527
1528 SCM_DEFINE (scm_tmpfile, "tmpfile", 0, 0, 0,
1529             (void),
1530             "Return an input/output port to a unique temporary file\n"
1531             "named using the path prefix @code{P_tmpdir} defined in\n"
1532             "@file{stdio.h}.\n"
1533             "The file is automatically deleted when the port is closed\n"
1534             "or the program terminates.")
1535 #define FUNC_NAME s_scm_tmpfile
1536 {
1537   FILE *rv;
1538   int fd;
1539
1540   if (! (rv = tmpfile ()))
1541     SCM_SYSERROR;
1542
1543 #ifndef __MINGW32__
1544   fd = dup (fileno (rv));
1545   fclose (rv);
1546 #else
1547   fd = fileno (rv);
1548   /* FIXME: leaking the file, it will never be closed! */
1549 #endif
1550
1551   return scm_fdes_to_port (fd, "w+", SCM_BOOL_F);
1552 }
1553 #undef FUNC_NAME
1554
1555 SCM_DEFINE (scm_utime, "utime", 1, 5, 0,
1556             (SCM pathname, SCM actime, SCM modtime, SCM actimens, SCM modtimens,
1557              SCM flags),
1558             "@code{utime} sets the access and modification times for the\n"
1559             "file named by @var{pathname}.  If @var{actime} or @var{modtime} is\n"
1560             "not supplied, then the current time is used.  @var{actime} and\n"
1561             "@var{modtime} must be integer time values as returned by the\n"
1562             "@code{current-time} procedure.\n\n"
1563             "The optional @var{actimens} and @var{modtimens} are nanoseconds\n"
1564             "to add @var{actime} and @var{modtime}. Nanosecond precision is\n"
1565             "only supported on some combinations of file systems and operating\n"
1566             "systems.\n"
1567             "@lisp\n"
1568             "(utime \"foo\" (- (current-time) 3600))\n"
1569             "@end lisp\n"
1570             "will set the access time to one hour in the past and the\n"
1571             "modification time to the current time.")
1572 #define FUNC_NAME s_scm_utime
1573 {
1574   int rv;
1575   time_t atim_sec, mtim_sec;
1576   long atim_nsec, mtim_nsec;
1577   int f;
1578
1579   if (SCM_UNBNDP (actime))
1580     {
1581 #ifdef HAVE_UTIMENSAT
1582       atim_sec = 0;
1583       atim_nsec = UTIME_NOW;
1584 #else
1585       SCM_SYSCALL (time (&atim_sec));
1586       atim_nsec = 0;
1587 #endif
1588     }
1589   else
1590     {
1591       atim_sec = SCM_NUM2ULONG (2, actime);
1592       if (SCM_UNBNDP (actimens))
1593         atim_nsec = 0;
1594       else
1595         atim_nsec = SCM_NUM2LONG (4, actimens);
1596     }
1597
1598   if (SCM_UNBNDP (modtime))
1599     {
1600 #ifdef HAVE_UTIMENSAT
1601       mtim_sec = 0;
1602       mtim_nsec = UTIME_NOW;
1603 #else
1604       SCM_SYSCALL (time (&mtim_sec));
1605       mtim_nsec = 0;
1606 #endif
1607     }
1608   else
1609     {
1610       mtim_sec = SCM_NUM2ULONG (3, modtime);
1611       if (SCM_UNBNDP (modtimens))
1612         mtim_nsec = 0;
1613       else
1614         mtim_nsec = SCM_NUM2LONG (5, modtimens);
1615     }
1616
1617   if (SCM_UNBNDP (flags))
1618     f = 0;
1619   else
1620     f = SCM_NUM2INT (6, flags);
1621
1622 #ifdef HAVE_UTIMENSAT
1623   {
1624     struct timespec times[2];
1625     times[0].tv_sec = atim_sec;
1626     times[0].tv_nsec = atim_nsec;
1627     times[1].tv_sec = mtim_sec;
1628     times[1].tv_nsec = mtim_nsec;
1629
1630     STRING_SYSCALL (pathname, c_pathname,
1631                     rv = utimensat (AT_FDCWD, c_pathname, times, f));
1632   }
1633 #else
1634   {
1635     struct utimbuf utm;
1636     utm.actime = atim_sec;
1637     utm.modtime = mtim_sec;
1638
1639     STRING_SYSCALL (pathname, c_pathname,
1640                     rv = utime (c_pathname, &utm));
1641   }
1642 #endif
1643
1644   if (rv != 0)
1645     SCM_SYSERROR;
1646   return SCM_UNSPECIFIED;
1647 }
1648 #undef FUNC_NAME
1649
1650 SCM_DEFINE (scm_getpid, "getpid", 0, 0, 0,
1651             (),
1652             "Return an integer representing the current process ID.")
1653 #define FUNC_NAME s_scm_getpid
1654 {
1655   return scm_from_ulong (getpid ());
1656 }
1657 #undef FUNC_NAME
1658
1659 SCM_DEFINE (scm_putenv, "putenv", 1, 0, 0,
1660             (SCM str),
1661             "Modifies the environment of the current process, which is also\n"
1662             "the default environment inherited by child processes.  If\n"
1663             "@var{str} is of the form @code{NAME=VALUE} then it will be\n"
1664             "written directly into the environment, replacing any existing\n"
1665             "environment string with name matching @code{NAME}.  If\n"
1666             "@var{str} does not contain an equal sign, then any existing\n"
1667             "string with name matching @var{str} will be removed.\n"
1668             "\n"
1669             "The return value is unspecified.")
1670 #define FUNC_NAME s_scm_putenv
1671 {
1672   int rv;
1673   char *c_str = scm_to_locale_string (str);
1674
1675   /* Leave C_STR in the environment.  */
1676
1677   /* Gnulib's `putenv' module honors the semantics described above.  */
1678   rv = putenv (c_str);
1679   if (rv < 0)
1680     SCM_SYSERROR;
1681
1682   return SCM_UNSPECIFIED;
1683 }
1684 #undef FUNC_NAME
1685
1686 /* This mutex is used to serialize invocations of `setlocale ()' on non-GNU
1687    systems (i.e., systems where a reentrant locale API is not available).  It
1688    is also acquired before calls to `nl_langinfo ()'.  See `i18n.c' for
1689    details.  */
1690 scm_i_pthread_mutex_t scm_i_locale_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER;
1691 SCM_PTHREAD_ATFORK_LOCK_STATIC_MUTEX (scm_i_locale_mutex);
1692
1693 #ifdef HAVE_SETLOCALE
1694
1695 SCM_DEFINE (scm_setlocale, "setlocale", 1, 1, 0,
1696             (SCM category, SCM locale),
1697             "If @var{locale} is omitted, return the current value of the\n"
1698             "specified locale category as a system-dependent string.\n"
1699             "@var{category} should be specified using the values\n"
1700             "@code{LC_COLLATE}, @code{LC_ALL} etc.\n"
1701             "\n"
1702             "Otherwise the specified locale category is set to the string\n"
1703             "@var{locale} and the new value is returned as a\n"
1704             "system-dependent string.  If @var{locale} is an empty string,\n"
1705             "the locale will be set using environment variables.\n"
1706             "\n"
1707             "When the locale is changed, the character encoding of the new\n"
1708             "locale (UTF-8, ISO-8859-1, etc.) is used for the current\n"
1709             "input, output, and error ports\n")
1710 #define FUNC_NAME s_scm_setlocale
1711 {
1712   int c_category;
1713   char *clocale;
1714   char *rv;
1715   const char *enc;
1716
1717   scm_dynwind_begin (0);
1718
1719   if (SCM_UNBNDP (locale))
1720     {
1721       clocale = NULL;
1722     }
1723   else
1724     {
1725       clocale = scm_to_locale_string (locale);
1726       scm_dynwind_free (clocale);
1727     }
1728
1729   c_category = scm_i_to_lc_category (category, 1);
1730
1731   scm_i_pthread_mutex_lock (&scm_i_locale_mutex);
1732   rv = setlocale (c_category, clocale);
1733   scm_i_pthread_mutex_unlock (&scm_i_locale_mutex);
1734
1735   if (rv == NULL)
1736     {
1737       /* POSIX and C99 don't say anything about setlocale setting errno, so
1738          force a sensible value here.  glibc leaves ENOENT, which would be
1739          fine, but it's not a documented feature.  */
1740       errno = EINVAL;
1741       SCM_SYSERROR;
1742     }
1743
1744   enc = locale_charset ();
1745
1746   /* Set the default encoding for new ports.  */
1747   scm_i_set_default_port_encoding (enc);
1748
1749   /* Set the encoding for the stdio ports.  */
1750   scm_i_set_port_encoding_x (scm_current_input_port (), enc);
1751   scm_i_set_port_encoding_x (scm_current_output_port (), enc);
1752   scm_i_set_port_encoding_x (scm_current_error_port (), enc);
1753
1754   scm_dynwind_end ();
1755   return scm_from_locale_string (rv);
1756 }
1757 #undef FUNC_NAME
1758 #endif /* HAVE_SETLOCALE */
1759
1760 #ifdef HAVE_MKNOD
1761 SCM_DEFINE (scm_mknod, "mknod", 4, 0, 0,
1762             (SCM path, SCM type, SCM perms, SCM dev),
1763             "Creates a new special file, such as a file corresponding to a device.\n"
1764             "@var{path} specifies the name of the file.  @var{type} should\n"
1765             "be one of the following symbols:\n"
1766             "regular, directory, symlink, block-special, char-special,\n"
1767             "fifo, or socket.  @var{perms} (an integer) specifies the file permissions.\n"
1768             "@var{dev} (an integer) specifies which device the special file refers\n"
1769             "to.  Its exact interpretation depends on the kind of special file\n"
1770             "being created.\n\n"
1771             "E.g.,\n"
1772             "@lisp\n"
1773             "(mknod \"/dev/fd0\" 'block-special #o660 (+ (* 2 256) 2))\n"
1774             "@end lisp\n\n"
1775             "The return value is unspecified.")
1776 #define FUNC_NAME s_scm_mknod
1777 {
1778   int val;
1779   const char *p;
1780   int ctype = 0;
1781
1782   SCM_VALIDATE_STRING (1, path);
1783   SCM_VALIDATE_SYMBOL (2, type);
1784
1785   p = scm_i_symbol_chars (type);
1786   if (strcmp (p, "regular") == 0)
1787     ctype = S_IFREG;
1788   else if (strcmp (p, "directory") == 0)
1789     ctype = S_IFDIR;
1790 #ifdef S_IFLNK
1791   /* systems without symlinks probably don't have S_IFLNK defined */
1792   else if (strcmp (p, "symlink") == 0)
1793     ctype = S_IFLNK;
1794 #endif
1795   else if (strcmp (p, "block-special") == 0)
1796     ctype = S_IFBLK;
1797   else if (strcmp (p, "char-special") == 0)
1798     ctype = S_IFCHR;
1799   else if (strcmp (p, "fifo") == 0)
1800     ctype = S_IFIFO;
1801 #ifdef S_IFSOCK
1802   else if (strcmp (p, "socket") == 0)
1803     ctype = S_IFSOCK;
1804 #endif
1805   else
1806     SCM_OUT_OF_RANGE (2, type);
1807
1808   STRING_SYSCALL (path, c_path,
1809                   val = mknod (c_path,
1810                                ctype | scm_to_int (perms),
1811                                scm_to_int (dev)));
1812   if (val != 0)
1813     SCM_SYSERROR;
1814   return SCM_UNSPECIFIED;
1815 }
1816 #undef FUNC_NAME
1817 #endif /* HAVE_MKNOD */
1818
1819 #ifdef HAVE_NICE
1820 SCM_DEFINE (scm_nice, "nice", 1, 0, 0,
1821             (SCM incr),
1822             "Increment the priority of the current process by @var{incr}.  A higher\n"
1823             "priority value means that the process runs less often.\n"
1824             "The return value is unspecified.")
1825 #define FUNC_NAME s_scm_nice
1826 {
1827   /* nice() returns "prio-NZERO" on success or -1 on error, but -1 can arise
1828      from "prio-NZERO", so an error must be detected from errno changed */
1829   errno = 0;
1830   nice (scm_to_int (incr));
1831   if (errno != 0)
1832     SCM_SYSERROR;
1833
1834   return SCM_UNSPECIFIED;
1835 }
1836 #undef FUNC_NAME
1837 #endif /* HAVE_NICE */
1838
1839 #ifdef HAVE_SYNC
1840 SCM_DEFINE (scm_sync, "sync", 0, 0, 0,
1841             (),
1842             "Flush the operating system disk buffers.\n"
1843             "The return value is unspecified.")
1844 #define FUNC_NAME s_scm_sync
1845 {
1846   sync();
1847   return SCM_UNSPECIFIED;
1848 }
1849 #undef FUNC_NAME
1850 #endif /* HAVE_SYNC */
1851
1852
1853 /* crypt() returns a pointer to a static buffer, so we use scm_i_misc_mutex
1854    to avoid another thread overwriting it.  A test program running crypt
1855    continuously in two threads can be quickly seen tripping this problem.
1856    crypt() is pretty slow normally, so a mutex shouldn't add much overhead.
1857
1858    glibc has a thread-safe crypt_r, but (in version 2.3.2) it runs a lot
1859    slower (about 5x) than plain crypt if you pass an uninitialized data
1860    block each time.  Presumably there's some one-time setups.  The best way
1861    to use crypt_r for parallel execution in multiple threads would probably
1862    be to maintain a little pool of initialized crypt_data structures, take
1863    one and use it, then return it to the pool.  That pool could be garbage
1864    collected so it didn't add permanently to memory use if only a few crypt
1865    calls are made.  But we expect crypt will be used rarely, and even more
1866    rarely will there be any desire for lots of parallel execution on
1867    multiple cpus.  So for now we don't bother with anything fancy, just
1868    ensure it works.  */
1869
1870 #ifdef HAVE_CRYPT
1871 SCM_DEFINE (scm_crypt, "crypt", 2, 0, 0,
1872             (SCM key, SCM salt),
1873             "Encrypt @var{key} using @var{salt} as the salt value to the\n"
1874             "crypt(3) library call.")
1875 #define FUNC_NAME s_scm_crypt
1876 {
1877   SCM ret;
1878   char *c_key, *c_salt, *c_ret;
1879
1880   scm_dynwind_begin (0);
1881   scm_i_dynwind_pthread_mutex_lock (&scm_i_misc_mutex);
1882
1883   c_key = scm_to_locale_string (key);
1884   scm_dynwind_free (c_key);
1885   c_salt = scm_to_locale_string (salt);
1886   scm_dynwind_free (c_salt);
1887
1888   /* The Linux crypt(3) man page says crypt will return NULL and set errno
1889      on error.  (Eg. ENOSYS if legal restrictions mean it cannot be
1890      implemented).  */
1891   c_ret = crypt (c_key, c_salt);
1892   if (c_ret == NULL)
1893     SCM_SYSERROR;
1894
1895   ret = scm_from_locale_string (c_ret);
1896   scm_dynwind_end ();
1897   return ret;
1898 }
1899 #undef FUNC_NAME
1900 #endif /* HAVE_CRYPT */
1901
1902 #if HAVE_CHROOT
1903 SCM_DEFINE (scm_chroot, "chroot", 1, 0, 0,
1904             (SCM path),
1905             "Change the root directory to that specified in @var{path}.\n"
1906             "This directory will be used for path names beginning with\n"
1907             "@file{/}.  The root directory is inherited by all children\n"
1908             "of the current process.  Only the superuser may change the\n"
1909             "root directory.")
1910 #define FUNC_NAME s_scm_chroot
1911 {
1912   int rv;
1913
1914   WITH_STRING (path, c_path,
1915                rv = chroot (c_path));
1916   if (rv == -1)
1917     SCM_SYSERROR;
1918   return SCM_UNSPECIFIED;
1919 }
1920 #undef FUNC_NAME
1921 #endif /* HAVE_CHROOT */
1922
1923
1924 #ifdef __MINGW32__
1925 /* Wrapper function to supplying `getlogin()' under Windows.  */
1926 static char * getlogin (void)
1927 {
1928   static char user[256];
1929   static unsigned long len = 256;
1930
1931   if (!GetUserName (user, &len))
1932     return NULL;
1933   return user;
1934 }
1935 #endif /* __MINGW32__ */
1936
1937
1938 #if defined (HAVE_GETLOGIN) || defined (__MINGW32__)
1939 SCM_DEFINE (scm_getlogin, "getlogin", 0, 0, 0,
1940             (void),
1941             "Return a string containing the name of the user logged in on\n"
1942             "the controlling terminal of the process, or @code{#f} if this\n"
1943             "information cannot be obtained.")
1944 #define FUNC_NAME s_scm_getlogin
1945 {
1946   char * p;
1947
1948   p = getlogin ();
1949   if (!p || !*p)
1950     return SCM_BOOL_F;
1951   return scm_from_locale_string (p);
1952 }
1953 #undef FUNC_NAME
1954 #endif /* HAVE_GETLOGIN */
1955
1956 #if HAVE_GETPRIORITY
1957 SCM_DEFINE (scm_getpriority, "getpriority", 2, 0, 0,
1958             (SCM which, SCM who),
1959             "Return the scheduling priority of the process, process group\n"
1960             "or user, as indicated by @var{which} and @var{who}. @var{which}\n"
1961             "is one of the variables @code{PRIO_PROCESS}, @code{PRIO_PGRP}\n"
1962             "or @code{PRIO_USER}, and @var{who} is interpreted relative to\n"
1963             "@var{which} (a process identifier for @code{PRIO_PROCESS},\n"
1964             "process group identifier for @code{PRIO_PGRP}, and a user\n"
1965             "identifier for @code{PRIO_USER}.  A zero value of @var{who}\n"
1966             "denotes the current process, process group, or user.  Return\n"
1967             "the highest priority (lowest numerical value) of any of the\n"
1968             "specified processes.")
1969 #define FUNC_NAME s_scm_getpriority
1970 {
1971   int cwhich, cwho, ret;
1972
1973   cwhich = scm_to_int (which);
1974   cwho = scm_to_int (who);
1975
1976   /* We have to clear errno and examine it later, because -1 is a
1977      legal return value for getpriority().  */
1978   errno = 0;
1979   ret = getpriority (cwhich, cwho);
1980   if (errno != 0)
1981     SCM_SYSERROR;
1982   return scm_from_int (ret);
1983 }
1984 #undef FUNC_NAME
1985 #endif /* HAVE_GETPRIORITY */
1986
1987 #if HAVE_SETPRIORITY
1988 SCM_DEFINE (scm_setpriority, "setpriority", 3, 0, 0,
1989             (SCM which, SCM who, SCM prio),
1990             "Set the scheduling priority of the process, process group\n"
1991             "or user, as indicated by @var{which} and @var{who}. @var{which}\n"
1992             "is one of the variables @code{PRIO_PROCESS}, @code{PRIO_PGRP}\n"
1993             "or @code{PRIO_USER}, and @var{who} is interpreted relative to\n"
1994             "@var{which} (a process identifier for @code{PRIO_PROCESS},\n"
1995             "process group identifier for @code{PRIO_PGRP}, and a user\n"
1996             "identifier for @code{PRIO_USER}.  A zero value of @var{who}\n"
1997             "denotes the current process, process group, or user.\n"
1998             "@var{prio} is a value in the range -20 and 20, the default\n"
1999             "priority is 0; lower priorities cause more favorable\n"
2000             "scheduling.  Sets the priority of all of the specified\n"
2001             "processes.  Only the super-user may lower priorities.\n"
2002             "The return value is not specified.")
2003 #define FUNC_NAME s_scm_setpriority
2004 {
2005   int cwhich, cwho, cprio;
2006
2007   cwhich = scm_to_int (which);
2008   cwho = scm_to_int (who);
2009   cprio = scm_to_int (prio);
2010
2011   if (setpriority (cwhich, cwho, cprio) == -1)
2012     SCM_SYSERROR;
2013   return SCM_UNSPECIFIED;
2014 }
2015 #undef FUNC_NAME
2016 #endif /* HAVE_SETPRIORITY */
2017
2018 #ifdef HAVE_SCHED_GETAFFINITY
2019
2020 static SCM
2021 cpu_set_to_bitvector (const cpu_set_t *cs)
2022 {
2023   SCM bv;
2024   size_t cpu;
2025
2026   bv = scm_c_make_bitvector (sizeof (*cs), SCM_BOOL_F);
2027
2028   for (cpu = 0; cpu < sizeof (*cs); cpu++)
2029     {
2030       if (CPU_ISSET (cpu, cs))
2031         /* XXX: This is inefficient but avoids code duplication.  */
2032         scm_c_bitvector_set_x (bv, cpu, SCM_BOOL_T);
2033     }
2034
2035   return bv;
2036 }
2037
2038 SCM_DEFINE (scm_getaffinity, "getaffinity", 1, 0, 0,
2039             (SCM pid),
2040             "Return a bitvector representing the CPU affinity mask for\n"
2041             "process @var{pid}.  Each CPU the process has affinity with\n"
2042             "has its corresponding bit set in the returned bitvector.\n"
2043             "The number of bits set is a good estimate of how many CPUs\n"
2044             "Guile can use without stepping on other processes' toes.\n\n"
2045             "Currently this procedure is only defined on GNU variants\n"
2046             "(@pxref{CPU Affinity, @code{sched_getaffinity},, libc, The\n"
2047             "GNU C Library Reference Manual}).\n")
2048 #define FUNC_NAME s_scm_getaffinity
2049 {
2050   int err;
2051   cpu_set_t cs;
2052
2053   CPU_ZERO (&cs);
2054   err = sched_getaffinity (scm_to_int (pid), sizeof (cs), &cs);
2055   if (err)
2056     SCM_SYSERROR;
2057
2058   return cpu_set_to_bitvector (&cs);
2059 }
2060 #undef FUNC_NAME
2061
2062 #endif /* HAVE_SCHED_GETAFFINITY */
2063
2064 #ifdef HAVE_SCHED_SETAFFINITY
2065
2066 SCM_DEFINE (scm_setaffinity, "setaffinity", 2, 0, 0,
2067             (SCM pid, SCM mask),
2068             "Install the CPU affinity mask @var{mask}, a bitvector, for\n"
2069             "the process or thread with ID @var{pid}.  The return value\n"
2070             "is unspecified.\n\n"
2071             "Currently this procedure is only defined on GNU variants\n"
2072             "(@pxref{CPU Affinity, @code{sched_setaffinity},, libc, The\n"
2073             "GNU C Library Reference Manual}).\n")
2074 #define FUNC_NAME s_scm_setaffinity
2075 {
2076   cpu_set_t cs;
2077   scm_t_array_handle handle;
2078   const scm_t_uint32 *c_mask;
2079   size_t len, off, cpu;
2080   ssize_t inc;
2081   int err;
2082
2083   c_mask = scm_bitvector_elements (mask, &handle, &off, &len, &inc);
2084
2085   CPU_ZERO (&cs);
2086   for (cpu = 0; cpu < len; cpu++)
2087     {
2088       size_t idx;
2089
2090       idx = cpu * inc + off;
2091       if (c_mask[idx / 32] & (1UL << (idx % 32)))
2092         CPU_SET (cpu, &cs);
2093     }
2094
2095   err = sched_setaffinity (scm_to_int (pid), sizeof (cs), &cs);
2096   if (err)
2097     SCM_SYSERROR;
2098
2099   return SCM_UNSPECIFIED;
2100 }
2101 #undef FUNC_NAME
2102
2103 #endif /* HAVE_SCHED_SETAFFINITY */
2104
2105 \f
2106 #if HAVE_GETPASS
2107 SCM_DEFINE (scm_getpass, "getpass", 1, 0, 0,
2108             (SCM prompt),
2109             "Display @var{prompt} to the standard error output and read\n"
2110             "a password from @file{/dev/tty}.  If this file is not\n"
2111             "accessible, it reads from standard input.  The password may be\n"
2112             "up to 127 characters in length.  Additional characters and the\n"
2113             "terminating newline character are discarded.  While reading\n"
2114             "the password, echoing and the generation of signals by special\n"
2115             "characters is disabled.")
2116 #define FUNC_NAME s_scm_getpass
2117 {
2118   char * p;
2119   SCM passwd;
2120
2121   SCM_VALIDATE_STRING (1, prompt);
2122
2123   WITH_STRING (prompt, c_prompt,
2124                p = getpass(c_prompt));
2125   passwd = scm_from_locale_string (p);
2126
2127   /* Clear out the password in the static buffer.  */
2128   memset (p, 0, strlen (p));
2129
2130   return passwd;
2131 }
2132 #undef FUNC_NAME
2133 #endif /* HAVE_GETPASS */
2134
2135 SCM_DEFINE (scm_flock, "flock", 2, 0, 0,
2136             (SCM file, SCM operation),
2137             "Apply or remove an advisory lock on an open file.\n"
2138             "@var{operation} specifies the action to be done:\n"
2139             "\n"
2140             "@defvar LOCK_SH\n"
2141             "Shared lock.  More than one process may hold a shared lock\n"
2142             "for a given file at a given time.\n"
2143             "@end defvar\n"
2144             "@defvar LOCK_EX\n"
2145             "Exclusive lock.  Only one process may hold an exclusive lock\n"
2146             "for a given file at a given time.\n"
2147             "@end defvar\n"
2148             "@defvar LOCK_UN\n"
2149             "Unlock the file.\n"
2150             "@end defvar\n"
2151             "@defvar LOCK_NB\n"
2152             "Don't block when locking.  This is combined with one of the\n"
2153             "other operations using @code{logior}.  If @code{flock} would\n"
2154             "block an @code{EWOULDBLOCK} error is thrown.\n"
2155             "@end defvar\n"
2156             "\n"
2157             "The return value is not specified. @var{file} may be an open\n"
2158             "file descriptor or an open file descriptor port.\n"
2159             "\n"
2160             "Note that @code{flock} does not lock files across NFS.")
2161 #define FUNC_NAME s_scm_flock
2162 {
2163   int fdes;
2164
2165   if (scm_is_integer (file))
2166     fdes = scm_to_int (file);
2167   else
2168     {
2169       SCM_VALIDATE_OPFPORT (2, file);
2170
2171       fdes = SCM_FPORT_FDES (file);
2172     }
2173   if (flock (fdes, scm_to_int (operation)) == -1)
2174     SCM_SYSERROR;
2175   return SCM_UNSPECIFIED;
2176 }
2177 #undef FUNC_NAME
2178
2179 #if HAVE_SETHOSTNAME
2180 SCM_DEFINE (scm_sethostname, "sethostname", 1, 0, 0,
2181             (SCM name),
2182             "Set the host name of the current processor to @var{name}. May\n"
2183             "only be used by the superuser.  The return value is not\n"
2184             "specified.")
2185 #define FUNC_NAME s_scm_sethostname
2186 {
2187   int rv;
2188
2189   WITH_STRING (name, c_name,
2190                rv = sethostname (c_name, strlen(c_name)));
2191   if (rv == -1)
2192     SCM_SYSERROR;
2193   return SCM_UNSPECIFIED;
2194 }
2195 #undef FUNC_NAME
2196 #endif /* HAVE_SETHOSTNAME */
2197
2198
2199 #if HAVE_GETHOSTNAME
2200 SCM_DEFINE (scm_gethostname, "gethostname", 0, 0, 0,
2201             (void),
2202             "Return the host name of the current processor.")
2203 #define FUNC_NAME s_scm_gethostname
2204 {
2205 #ifdef MAXHOSTNAMELEN
2206
2207   /* Various systems define MAXHOSTNAMELEN (including Solaris in fact).
2208    * On GNU/Linux this doesn't include the terminating '\0', hence "+ 1".  */
2209   const int len = MAXHOSTNAMELEN + 1;
2210   char *const p = scm_malloc (len);
2211   const int res = gethostname (p, len);
2212
2213   scm_dynwind_begin (0);
2214   scm_dynwind_unwind_handler (free, p, 0);
2215
2216 #else
2217
2218   /* Default 256 is for Solaris, under Linux ENAMETOOLONG is returned if not
2219    * large enough.  SUSv2 specifies 255 maximum too, apparently.  */
2220   int len = 256;
2221   int res;
2222   char *p;
2223
2224 #  if HAVE_SYSCONF && defined (_SC_HOST_NAME_MAX)
2225
2226   /* POSIX specifies the HOST_NAME_MAX system parameter for the max size,
2227    * which may reflect a particular kernel configuration.
2228    * Must watch out for this existing but giving -1, as happens for instance
2229    * in gnu/linux glibc 2.3.2.  */
2230   {
2231     const long int n = sysconf (_SC_HOST_NAME_MAX);
2232     if (n != -1L)
2233       len = n;
2234   }
2235
2236 #  endif
2237
2238   p = scm_malloc (len);
2239
2240   scm_dynwind_begin (0);
2241   scm_dynwind_unwind_handler (free, p, 0);
2242
2243   res = gethostname (p, len);
2244   while (res == -1 && errno == ENAMETOOLONG)
2245     {
2246       len *= 2;
2247
2248       /* scm_realloc may throw an exception.  */
2249       p = scm_realloc (p, len);
2250       res = gethostname (p, len);
2251     }
2252
2253 #endif
2254
2255   if (res == -1)
2256     {
2257       const int save_errno = errno;
2258
2259       /* No guile exceptions can occur before we have freed p's memory. */
2260       scm_dynwind_end ();
2261       free (p);
2262
2263       errno = save_errno;
2264       SCM_SYSERROR;
2265     }
2266   else
2267     {
2268       /* scm_from_locale_string may throw an exception.  */
2269       const SCM name = scm_from_locale_string (p);
2270
2271       /* No guile exceptions can occur before we have freed p's memory. */
2272       scm_dynwind_end ();
2273       free (p);
2274
2275       return name;
2276     }
2277 }
2278 #undef FUNC_NAME
2279 #endif /* HAVE_GETHOSTNAME */
2280
2281 \f
2282 #ifdef HAVE_FORK
2283 static void
2284 scm_init_popen (void)
2285 {
2286   scm_c_define_gsubr ("open-process", 2, 0, 1, scm_open_process);
2287 }
2288 #endif
2289
2290 void
2291 scm_init_posix ()
2292 {
2293   scm_add_feature ("posix");
2294 #ifdef HAVE_GETEUID
2295   scm_add_feature ("EIDs");
2296 #endif
2297 #ifdef WAIT_ANY
2298   scm_c_define ("WAIT_ANY", scm_from_int (WAIT_ANY));
2299 #endif
2300 #ifdef WAIT_MYPGRP
2301   scm_c_define ("WAIT_MYPGRP", scm_from_int (WAIT_MYPGRP));
2302 #endif
2303 #ifdef WNOHANG
2304   scm_c_define ("WNOHANG", scm_from_int (WNOHANG));
2305 #endif
2306 #ifdef WUNTRACED
2307   scm_c_define ("WUNTRACED", scm_from_int (WUNTRACED));
2308 #endif
2309
2310 #ifdef LC_COLLATE
2311   scm_c_define ("LC_COLLATE", scm_from_int (LC_COLLATE));
2312 #endif
2313 #ifdef LC_CTYPE
2314   scm_c_define ("LC_CTYPE", scm_from_int (LC_CTYPE));
2315 #endif
2316 #ifdef LC_MONETARY
2317   scm_c_define ("LC_MONETARY", scm_from_int (LC_MONETARY));
2318 #endif
2319 #ifdef LC_NUMERIC
2320   scm_c_define ("LC_NUMERIC", scm_from_int (LC_NUMERIC));
2321 #endif
2322 #ifdef LC_TIME
2323   scm_c_define ("LC_TIME", scm_from_int (LC_TIME));
2324 #endif
2325 #ifdef LC_MESSAGES
2326   scm_c_define ("LC_MESSAGES", scm_from_int (LC_MESSAGES));
2327 #endif
2328 #ifdef LC_ALL
2329   scm_c_define ("LC_ALL", scm_from_int (LC_ALL));
2330 #endif
2331 #ifdef LC_PAPER
2332   scm_c_define ("LC_PAPER", scm_from_int (LC_PAPER));
2333 #endif
2334 #ifdef LC_NAME
2335   scm_c_define ("LC_NAME", scm_from_int (LC_NAME));
2336 #endif
2337 #ifdef LC_ADDRESS
2338   scm_c_define ("LC_ADDRESS", scm_from_int (LC_ADDRESS));
2339 #endif
2340 #ifdef LC_TELEPHONE
2341   scm_c_define ("LC_TELEPHONE", scm_from_int (LC_TELEPHONE));
2342 #endif
2343 #ifdef LC_MEASUREMENT
2344   scm_c_define ("LC_MEASUREMENT", scm_from_int (LC_MEASUREMENT));
2345 #endif
2346 #ifdef LC_IDENTIFICATION
2347   scm_c_define ("LC_IDENTIFICATION", scm_from_int (LC_IDENTIFICATION));
2348 #endif
2349 #ifdef PIPE_BUF
2350   scm_c_define ("PIPE_BUF", scm_from_long (PIPE_BUF));
2351 #endif
2352
2353 #ifdef PRIO_PROCESS
2354   scm_c_define ("PRIO_PROCESS", scm_from_int (PRIO_PROCESS));
2355 #endif
2356 #ifdef PRIO_PGRP
2357   scm_c_define ("PRIO_PGRP", scm_from_int (PRIO_PGRP));
2358 #endif
2359 #ifdef PRIO_USER
2360   scm_c_define ("PRIO_USER", scm_from_int (PRIO_USER));
2361 #endif
2362
2363 #ifdef LOCK_SH
2364   scm_c_define ("LOCK_SH", scm_from_int (LOCK_SH));
2365 #endif
2366 #ifdef LOCK_EX
2367   scm_c_define ("LOCK_EX", scm_from_int (LOCK_EX));
2368 #endif
2369 #ifdef LOCK_UN
2370   scm_c_define ("LOCK_UN", scm_from_int (LOCK_UN));
2371 #endif
2372 #ifdef LOCK_NB
2373   scm_c_define ("LOCK_NB", scm_from_int (LOCK_NB));
2374 #endif
2375
2376 #include "libguile/cpp-SIG.c"
2377 #include "libguile/posix.x"
2378
2379   scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION,
2380                             "scm_init_popen",
2381                             (scm_t_extension_init_func) scm_init_popen,
2382                             NULL);
2383 }
2384
2385 /*
2386   Local Variables:
2387   c-file-style: "gnu"
2388   End:
2389 */