libguile/posix.c

   1 /* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   2  *   2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public License
   6  * as published by the Free Software Foundation; either version 3 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301 USA
  18  */
  19
  20
  21 \f
  22 #ifdef HAVE_CONFIG_H
  23 #  include <config.h>
  24 #endif
  25
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <errno.h>
  29 #include <uniconv.h>
  30
  31 #ifdef HAVE_SCHED_H
  32 # include <sched.h>
  33 #endif
  34
  35 #include "libguile/_scm.h"
  36 #include "libguile/dynwind.h"
  37 #include "libguile/fports.h"
  38 #include "libguile/scmsigs.h"
  39 #include "libguile/feature.h"
  40 #include "libguile/strings.h"
  41 #include "libguile/srfi-13.h"
  42 #include "libguile/srfi-14.h"
  43 #include "libguile/vectors.h"
  44 #include "libguile/values.h"
  45
  46 #include "libguile/validate.h"
  47 #include "libguile/posix.h"
  48 #include "libguile/gettext.h"
  49 #include "libguile/threads.h"
  50 \f
  51
  52 #ifdef HAVE_STRING_H
  53 #include <string.h>
  54 #endif
  55 #ifdef TIME_WITH_SYS_TIME
  56 # include <sys/time.h>
  57 # include <time.h>
  58 #else
  59 # if HAVE_SYS_TIME_H
  60 #  include <sys/time.h>
  61 # else
  62 #  include <time.h>
  63 # endif
  64 #endif
  65
  66 #ifdef HAVE_UNISTD_H
  67 #include <unistd.h>
  68 #else
  69 #ifndef ttyname
  70 extern char *ttyname();
  71 #endif
  72 #endif
  73
  74 #ifdef LIBC_H_WITH_UNISTD_H
  75 #include <libc.h>
  76 #endif
  77
  78 #include <sys/types.h>
  79 #include <sys/stat.h>
  80 #include <fcntl.h>
  81
  82 #ifdef HAVE_PWD_H
  83 #include <pwd.h>
  84 #endif
  85 #ifdef HAVE_IO_H
  86 #include <io.h>
  87 #endif
  88 #ifdef HAVE_WINSOCK2_H
  89 #include <winsock2.h>
  90 #endif
  91
  92 #ifdef __MINGW32__
  93 /* Some defines for Windows here. */
  94 # include <process.h>
  95 # define pipe(fd) _pipe (fd, 256, O_BINARY)
  96 #endif /* __MINGW32__ */
  97
  98 #if HAVE_SYS_WAIT_H
  99 # include <sys/wait.h>
 100 #endif
 101 #ifndef WEXITSTATUS
 102 # define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
 103 #endif
 104 #ifndef WIFEXITED
 105 # define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
 106 #endif
 107
 108 #include <signal.h>
 109
 110 #ifdef HAVE_GRP_H
 111 #include <grp.h>
 112 #endif
 113 #ifdef HAVE_SYS_UTSNAME_H
 114 #include <sys/utsname.h>
 115 #endif
 116
 117 #ifdef HAVE_SETLOCALE
 118 #include <locale.h>
 119 #endif
 120
 121 #if (defined HAVE_NEWLOCALE) && (defined HAVE_STRCOLL_L)
 122 # define USE_GNU_LOCALE_API
 123 #endif
 124
 125 #if (defined USE_GNU_LOCALE_API) && (defined HAVE_XLOCALE_H)
 126 # include <xlocale.h>
 127 #endif
 128
 129 #ifdef HAVE_CRYPT_H
 130 #  include <crypt.h>
 131 #endif
 132
 133 #ifdef HAVE_NETDB_H
 134 #include <netdb.h>      /* for MAXHOSTNAMELEN on Solaris */
 135 #endif
 136
 137 #ifdef HAVE_SYS_PARAM_H
 138 #include <sys/param.h>  /* for MAXHOSTNAMELEN */
 139 #endif
 140
 141 #if HAVE_SYS_RESOURCE_H
 142 #  include <sys/resource.h>
 143 #endif
 144
 145 #include <sys/file.h>     /* from Gnulib */
 146
 147 /* Some Unix systems don't define these.  CPP hair is dangerous, but
 148    this seems safe enough... */
 149 #ifndef R_OK
 150 #define R_OK 4
 151 #endif
 152
 153 #ifndef W_OK
 154 #define W_OK 2
 155 #endif
 156
 157 #ifndef X_OK
 158 #define X_OK 1
 159 #endif
 160
 161 #ifndef F_OK
 162 #define F_OK 0
 163 #endif
 164
 165 /* No prototype for this on Solaris 10.  The man page says it's in
 166    <unistd.h> ... but it lies. */
 167 #if ! HAVE_DECL_SETHOSTNAME
 168 int sethostname (char *name, size_t namelen);
 169 #endif
 170
 171 /* On NextStep, <utime.h> doesn't define struct utime, unless we
 172    #define _POSIX_SOURCE before #including it.  I think this is less
 173    of a kludge than defining struct utimbuf ourselves.  */
 174 #ifdef UTIMBUF_NEEDS_POSIX
 175 #define _POSIX_SOURCE
 176 #endif
 177
 178 #ifdef HAVE_SYS_UTIME_H
 179 #include <sys/utime.h>
 180 #endif
 181
 182 #ifdef HAVE_UTIME_H
 183 #include <utime.h>
 184 #endif
 185
 186 /* Please don't add any more #includes or #defines here.  The hack
 187    above means that _POSIX_SOURCE may be #defined, which will
 188    encourage header files to do strange things.
 189
 190    FIXME: Maybe should undef _POSIX_SOURCE after it's done its job.
 191
 192    FIXME: Probably should do all the includes first, then all the fallback
 193    declarations and defines, in case things are not in the header we
 194    imagine.  */
 195
 196
 197
 198
 199 \f
 200
 201 /* Two often used patterns
 202  */
 203
 204 #define WITH_STRING(str,cstr,code)             \
 205   do {                                         \
 206     char *cstr = scm_to_locale_string (str);   \
 207     code;                                      \
 208     free (cstr);                               \
 209   } while (0)
 210
 211 #define STRING_SYSCALL(str,cstr,code)        \
 212   do {                                       \
 213     int eno;                                 \
 214     char *cstr = scm_to_locale_string (str); \
 215     SCM_SYSCALL (code);                      \
 216     eno = errno; free (cstr); errno = eno;   \
 217   } while (0)
 218
 219
 220 \f
 221 SCM_SYMBOL (sym_read_pipe, "read pipe");
 222 SCM_SYMBOL (sym_write_pipe, "write pipe");
 223
 224 SCM_DEFINE (scm_pipe, "pipe", 0, 0, 0,
 225             (),
 226             "Return a newly created pipe: a pair of ports which are linked\n"
 227             "together on the local machine.  The @emph{car} is the input\n"
 228             "port and the @emph{cdr} is the output port.  Data written (and\n"
 229             "flushed) to the output port can be read from the input port.\n"
 230             "Pipes are commonly used for communication with a newly forked\n"
 231             "child process.  The need to flush the output port can be\n"
 232             "avoided by making it unbuffered using @code{setvbuf}.\n"
 233             "\n"
 234             "Writes occur atomically provided the size of the data in bytes\n"
 235             "is not greater than the value of @code{PIPE_BUF}.  Note that\n"
 236             "the output port is likely to block if too much data (typically\n"
 237             "equal to @code{PIPE_BUF}) has been written but not yet read\n"
 238             "from the input port.")
 239 #define FUNC_NAME s_scm_pipe
 240 {
 241   int fd[2], rv;
 242   SCM p_rd, p_wt;
 243
 244   rv = pipe (fd);
 245   if (rv)
 246     SCM_SYSERROR;
 247
 248   p_rd = scm_fdes_to_port (fd[0], "r", sym_read_pipe);
 249   p_wt = scm_fdes_to_port (fd[1], "w", sym_write_pipe);
 250   return scm_cons (p_rd, p_wt);
 251 }
 252 #undef FUNC_NAME
 253
 254
 255 #ifdef HAVE_GETGROUPS
 256 SCM_DEFINE (scm_getgroups, "getgroups", 0, 0, 0,
 257             (),
 258             "Return a vector of integers representing the current\n"
 259             "supplementary group IDs.")
 260 #define FUNC_NAME s_scm_getgroups
 261 {
 262   SCM result;
 263   int ngroups;
 264   size_t size;
 265   GETGROUPS_T *groups;
 266
 267   ngroups = getgroups (0, NULL);
 268   if (ngroups <= 0)
 269     SCM_SYSERROR;
 270
 271   size = ngroups * sizeof (GETGROUPS_T);
 272   groups = scm_malloc (size);
 273   ngroups = getgroups (ngroups, groups);
 274
 275   result = scm_c_make_vector (ngroups, SCM_BOOL_F);
 276   while (--ngroups >= 0)
 277     SCM_SIMPLE_VECTOR_SET (result, ngroups, scm_from_ulong (groups[ngroups]));
 278
 279   free (groups);
 280   return result;
 281 }
 282 #undef FUNC_NAME
 283 #endif
 284
 285 #ifdef HAVE_SETGROUPS
 286 SCM_DEFINE (scm_setgroups, "setgroups", 1, 0, 0,
 287             (SCM group_vec),
 288             "Set the current set of supplementary group IDs to the integers\n"
 289             "in the given vector @var{group_vec}.  The return value is\n"
 290             "unspecified.\n"
 291             "\n"
 292             "Generally only the superuser can set the process group IDs.")
 293 #define FUNC_NAME s_scm_setgroups
 294 {
 295   size_t ngroups;
 296   size_t size;
 297   size_t i;
 298   int result;
 299   int save_errno;
 300   GETGROUPS_T *groups;
 301
 302   SCM_VALIDATE_VECTOR (SCM_ARG1, group_vec);
 303
 304   ngroups = SCM_SIMPLE_VECTOR_LENGTH (group_vec);
 305
 306   /* validate before allocating, so we don't have to worry about leaks */
 307   for (i = 0; i < ngroups; i++)
 308     {
 309       unsigned long ulong_gid;
 310       GETGROUPS_T gid;
 311       SCM_VALIDATE_ULONG_COPY (1, SCM_SIMPLE_VECTOR_REF (group_vec, i),
 312                                ulong_gid);
 313       gid = ulong_gid;
 314       if (gid != ulong_gid)
 315         SCM_OUT_OF_RANGE (1, SCM_SIMPLE_VECTOR_REF (group_vec, i));
 316     }
 317
 318   size = ngroups * sizeof (GETGROUPS_T);
 319   if (size / sizeof (GETGROUPS_T) != ngroups)
 320     SCM_OUT_OF_RANGE (SCM_ARG1, scm_from_int (ngroups));
 321   groups = scm_malloc (size);
 322   for(i = 0; i < ngroups; i++)
 323     groups [i] = SCM_NUM2ULONG (1, SCM_SIMPLE_VECTOR_REF (group_vec, i));
 324
 325   result = setgroups (ngroups, groups);
 326   save_errno = errno; /* don't let free() touch errno */
 327   free (groups);
 328   errno = save_errno;
 329   if (result < 0)
 330     SCM_SYSERROR;
 331   return SCM_UNSPECIFIED;
 332 }
 333 #undef FUNC_NAME
 334 #endif
 335
 336 #ifdef HAVE_GETPWENT
 337 SCM_DEFINE (scm_getpwuid, "getpw", 0, 1, 0,
 338             (SCM user),
 339             "Look up an entry in the user database.  @var{user} can be an\n"
 340             "integer, a string, or omitted, giving the behaviour of\n"
 341             "@code{getpwuid}, @code{getpwnam} or @code{getpwent}\n"
 342             "respectively.")
 343 #define FUNC_NAME s_scm_getpwuid
 344 {
 345   struct passwd *entry;
 346
 347   SCM result = scm_c_make_vector (7, SCM_UNSPECIFIED);
 348   if (SCM_UNBNDP (user) || scm_is_false (user))
 349     {
 350       SCM_SYSCALL (entry = getpwent ());
 351       if (! entry)
 352         {
 353           return SCM_BOOL_F;
 354         }
 355     }
 356   else if (scm_is_integer (user))
 357     {
 358       entry = getpwuid (scm_to_int (user));
 359     }
 360   else
 361     {
 362       WITH_STRING (user, c_user,
 363                    entry = getpwnam (c_user));
 364     }
 365   if (!entry)
 366     SCM_MISC_ERROR ("entry not found", SCM_EOL);
 367
 368   SCM_SIMPLE_VECTOR_SET(result, 0, scm_from_locale_string (entry->pw_name));
 369   SCM_SIMPLE_VECTOR_SET(result, 1, scm_from_locale_string (entry->pw_passwd));
 370   SCM_SIMPLE_VECTOR_SET(result, 2, scm_from_ulong (entry->pw_uid));
 371   SCM_SIMPLE_VECTOR_SET(result, 3, scm_from_ulong (entry->pw_gid));
 372   SCM_SIMPLE_VECTOR_SET(result, 4, scm_from_locale_string (entry->pw_gecos));
 373   if (!entry->pw_dir)
 374     SCM_SIMPLE_VECTOR_SET(result, 5, scm_from_locale_string (""));
 375   else
 376     SCM_SIMPLE_VECTOR_SET(result, 5, scm_from_locale_string (entry->pw_dir));
 377   if (!entry->pw_shell)
 378     SCM_SIMPLE_VECTOR_SET(result, 6, scm_from_locale_string (""));
 379   else
 380     SCM_SIMPLE_VECTOR_SET(result, 6, scm_from_locale_string (entry->pw_shell));
 381   return result;
 382 }
 383 #undef FUNC_NAME
 384 #endif /* HAVE_GETPWENT */
 385
 386
 387 #ifdef HAVE_SETPWENT
 388 SCM_DEFINE (scm_setpwent, "setpw", 0, 1, 0,
 389             (SCM arg),
 390             "If called with a true argument, initialize or reset the password data\n"
 391             "stream.  Otherwise, close the stream.  The @code{setpwent} and\n"
 392             "@code{endpwent} procedures are implemented on top of this.")
 393 #define FUNC_NAME s_scm_setpwent
 394 {
 395   if (SCM_UNBNDP (arg) || scm_is_false (arg))
 396     endpwent ();
 397   else
 398     setpwent ();
 399   return SCM_UNSPECIFIED;
 400 }
 401 #undef FUNC_NAME
 402 #endif
 403
 404
 405 #ifdef HAVE_GETGRENT
 406 /* Combines getgrgid and getgrnam.  */
 407 SCM_DEFINE (scm_getgrgid, "getgr", 0, 1, 0,
 408             (SCM name),
 409             "Look up an entry in the group database.  @var{name} can be an\n"
 410             "integer, a string, or omitted, giving the behaviour of\n"
 411             "@code{getgrgid}, @code{getgrnam} or @code{getgrent}\n"
 412             "respectively.")
 413 #define FUNC_NAME s_scm_getgrgid
 414 {
 415   struct group *entry;
 416   SCM result = scm_c_make_vector (4, SCM_UNSPECIFIED);
 417
 418   if (SCM_UNBNDP (name) || scm_is_false (name))
 419     {
 420       SCM_SYSCALL (entry = getgrent ());
 421       if (! entry)
 422         {
 423           return SCM_BOOL_F;
 424         }
 425     }
 426   else if (scm_is_integer (name))
 427     SCM_SYSCALL (entry = getgrgid (scm_to_int (name)));
 428   else
 429     STRING_SYSCALL (name, c_name,
 430                     entry = getgrnam (c_name));
 431   if (!entry)
 432     SCM_SYSERROR;
 433
 434   SCM_SIMPLE_VECTOR_SET(result, 0, scm_from_locale_string (entry->gr_name));
 435   SCM_SIMPLE_VECTOR_SET(result, 1, scm_from_locale_string (entry->gr_passwd));
 436   SCM_SIMPLE_VECTOR_SET(result, 2, scm_from_ulong  (entry->gr_gid));
 437   SCM_SIMPLE_VECTOR_SET(result, 3, scm_makfromstrs (-1, entry->gr_mem));
 438   return result;
 439 }
 440 #undef FUNC_NAME
 441
 442
 443
 444 SCM_DEFINE (scm_setgrent, "setgr", 0, 1, 0,
 445             (SCM arg),
 446             "If called with a true argument, initialize or reset the group data\n"
 447             "stream.  Otherwise, close the stream.  The @code{setgrent} and\n"
 448             "@code{endgrent} procedures are implemented on top of this.")
 449 #define FUNC_NAME s_scm_setgrent
 450 {
 451   if (SCM_UNBNDP (arg) || scm_is_false (arg))
 452     endgrent ();
 453   else
 454     setgrent ();
 455   return SCM_UNSPECIFIED;
 456 }
 457 #undef FUNC_NAME
 458 #endif /* HAVE_GETGRENT */
 459
 460
 461 #ifdef HAVE_GETRLIMIT
 462 #ifdef RLIMIT_AS
 463 SCM_SYMBOL (sym_as, "as");
 464 #endif
 465 #ifdef RLIMIT_CORE
 466 SCM_SYMBOL (sym_core, "core");
 467 #endif
 468 #ifdef RLIMIT_CPU
 469 SCM_SYMBOL (sym_cpu, "cpu");
 470 #endif
 471 #ifdef RLIMIT_DATA
 472 SCM_SYMBOL (sym_data, "data");
 473 #endif
 474 #ifdef RLIMIT_FSIZE
 475 SCM_SYMBOL (sym_fsize, "fsize");
 476 #endif
 477 #ifdef RLIMIT_MEMLOCK
 478 SCM_SYMBOL (sym_memlock, "memlock");
 479 #endif
 480 #ifdef RLIMIT_MSGQUEUE
 481 SCM_SYMBOL (sym_msgqueue, "msgqueue");
 482 #endif
 483 #ifdef RLIMIT_NICE
 484 SCM_SYMBOL (sym_nice, "nice");
 485 #endif
 486 #ifdef RLIMIT_NOFILE
 487 SCM_SYMBOL (sym_nofile, "nofile");
 488 #endif
 489 #ifdef RLIMIT_NPROC
 490 SCM_SYMBOL (sym_nproc, "nproc");
 491 #endif
 492 #ifdef RLIMIT_RSS
 493 SCM_SYMBOL (sym_rss, "rss");
 494 #endif
 495 #ifdef RLIMIT_RTPRIO
 496 SCM_SYMBOL (sym_rtprio, "rtprio");
 497 #endif
 498 #ifdef RLIMIT_RTPRIO
 499 SCM_SYMBOL (sym_rttime, "rttime");
 500 #endif
 501 #ifdef RLIMIT_SIGPENDING
 502 SCM_SYMBOL (sym_sigpending, "sigpending");
 503 #endif
 504 #ifdef RLIMIT_STACK
 505 SCM_SYMBOL (sym_stack, "stack");
 506 #endif
 507
 508 static int
 509 scm_to_resource (SCM s, const char *func, int pos)
 510 {
 511   if (scm_is_number (s))
 512     return scm_to_int (s);
 513
 514   SCM_ASSERT_TYPE (scm_is_symbol (s), s, pos, func, "symbol");
 515
 516 #ifdef RLIMIT_AS
 517   if (scm_is_eq (s, sym_as))
 518     return RLIMIT_AS;
 519 #endif
 520 #ifdef RLIMIT_CORE
 521   if (scm_is_eq (s, sym_core))
 522     return RLIMIT_CORE;
 523 #endif
 524 #ifdef RLIMIT_CPU
 525   if (scm_is_eq (s, sym_cpu))
 526     return RLIMIT_CPU;
 527 #endif
 528 #ifdef RLIMIT_DATA
 529   if (scm_is_eq (s, sym_data))
 530     return RLIMIT_DATA;
 531 #endif
 532 #ifdef RLIMIT_FSIZE
 533   if (scm_is_eq (s, sym_fsize))
 534     return RLIMIT_FSIZE;
 535 #endif
 536 #ifdef RLIMIT_MEMLOCK
 537   if (scm_is_eq (s, sym_memlock))
 538     return RLIMIT_MEMLOCK;
 539 #endif
 540 #ifdef RLIMIT_MSGQUEUE
 541   if (scm_is_eq (s, sym_msgqueue))
 542     return RLIMIT_MSGQUEUE;
 543 #endif
 544 #ifdef RLIMIT_NICE
 545   if (scm_is_eq (s, sym_nice))
 546     return RLIMIT_NICE;
 547 #endif
 548 #ifdef RLIMIT_NOFILE
 549   if (scm_is_eq (s, sym_nofile))
 550     return RLIMIT_NOFILE;
 551 #endif
 552 #ifdef RLIMIT_NPROC
 553   if (scm_is_eq (s, sym_nproc))
 554     return RLIMIT_NPROC;
 555 #endif
 556 #ifdef RLIMIT_RSS
 557   if (scm_is_eq (s, sym_rss))
 558     return RLIMIT_RSS;
 559 #endif
 560 #ifdef RLIMIT_RTPRIO
 561   if (scm_is_eq (s, sym_rtprio))
 562     return RLIMIT_RTPRIO;
 563 #endif
 564 #ifdef RLIMIT_RTPRIO
 565   if (scm_is_eq (s, sym_rttime))
 566     return RLIMIT_RTPRIO;
 567 #endif
 568 #ifdef RLIMIT_SIGPENDING
 569   if (scm_is_eq (s, sym_sigpending))
 570     return RLIMIT_SIGPENDING;
 571 #endif
 572 #ifdef RLIMIT_STACK
 573   if (scm_is_eq (s, sym_stack))
 574     return RLIMIT_STACK;
 575 #endif
 576
 577   scm_misc_error (func, "invalid rlimit resource ~A", scm_list_1 (s));
 578   return 0;
 579 }
 580
 581 SCM_DEFINE (scm_getrlimit, "getrlimit", 1, 0, 0,
 582             (SCM resource),
 583             "Get a resource limit for this process. @var{resource} identifies the resource,\n"
 584             "either as an integer or as a symbol. For example, @code{(getrlimit 'stack)}\n"
 585             "gets the limits associated with @code{RLIMIT_STACK}.\n\n"
 586             "@code{getrlimit} returns two values, the soft and the hard limit. If no\n"
 587             "limit is set for the resource in question, the returned limit will be @code{#f}.")
 588 #define FUNC_NAME s_scm_getrlimit
 589 {
 590   int iresource;
 591   struct rlimit lim = { 0, 0 };
 592
 593   iresource = scm_to_resource (resource, FUNC_NAME, 1);
 594
 595   if (getrlimit (iresource, &lim) != 0)
 596     scm_syserror (FUNC_NAME);
 597
 598   return scm_values (scm_list_2 ((lim.rlim_cur == RLIM_INFINITY) ? SCM_BOOL_F
 599                                  : scm_from_long (lim.rlim_cur),
 600                                  (lim.rlim_max == RLIM_INFINITY) ? SCM_BOOL_F
 601                                  : scm_from_long (lim.rlim_max)));
 602 }
 603 #undef FUNC_NAME
 604
 605
 606 #ifdef HAVE_SETRLIMIT
 607 SCM_DEFINE (scm_setrlimit, "setrlimit", 3, 0, 0,
 608             (SCM resource, SCM soft, SCM hard),
 609             "Set a resource limit for this process. @var{resource} identifies the resource,\n"
 610             "either as an integer or as a symbol. @var{soft} and @var{hard} should be integers,\n"
 611             "or @code{#f} to indicate no limit (i.e., @code{RLIM_INFINITY}).\n\n"
 612             "For example, @code{(setrlimit 'stack 150000 300000)} sets the @code{RLIMIT_STACK}\n"
 613             "limit to 150 kilobytes, with a hard limit of 300 kB.")
 614 #define FUNC_NAME s_scm_setrlimit
 615 {
 616   int iresource;
 617   struct rlimit lim = { 0, 0 };
 618
 619   iresource = scm_to_resource (resource, FUNC_NAME, 1);
 620
 621   lim.rlim_cur = scm_is_false (soft) ? RLIM_INFINITY : scm_to_long (soft);
 622   lim.rlim_max = scm_is_false (hard) ? RLIM_INFINITY : scm_to_long (hard);
 623
 624   if (setrlimit (iresource, &lim) != 0)
 625     scm_syserror (FUNC_NAME);
 626
 627   return SCM_UNSPECIFIED;
 628 }
 629 #undef FUNC_NAME
 630 #endif /* HAVE_SETRLIMIT */
 631 #endif /* HAVE_GETRLIMIT */
 632
 633
 634 SCM_DEFINE (scm_kill, "kill", 2, 0, 0,
 635             (SCM pid, SCM sig),
 636             "Sends a signal to the specified process or group of processes.\n\n"
 637             "@var{pid} specifies the processes to which the signal is sent:\n\n"
 638             "@table @r\n"
 639             "@item @var{pid} greater than 0\n"
 640             "The process whose identifier is @var{pid}.\n"
 641             "@item @var{pid} equal to 0\n"
 642             "All processes in the current process group.\n"
 643             "@item @var{pid} less than -1\n"
 644             "The process group whose identifier is -@var{pid}\n"
 645             "@item @var{pid} equal to -1\n"
 646             "If the process is privileged, all processes except for some special\n"
 647             "system processes.  Otherwise, all processes with the current effective\n"
 648             "user ID.\n"
 649             "@end table\n\n"
 650             "@var{sig} should be specified using a variable corresponding to\n"
 651             "the Unix symbolic name, e.g.,\n\n"
 652             "@defvar SIGHUP\n"
 653             "Hang-up signal.\n"
 654             "@end defvar\n\n"
 655             "@defvar SIGINT\n"
 656             "Interrupt signal.\n"
 657             "@end defvar")
 658 #define FUNC_NAME s_scm_kill
 659 {
 660   /* Signal values are interned in scm_init_posix().  */
 661 #ifdef HAVE_KILL
 662   if (kill (scm_to_int (pid), scm_to_int  (sig)) != 0)
 663     SCM_SYSERROR;
 664 #else
 665   /* Mingw has raise(), but not kill().  (Other raw DOS environments might
 666      be similar.)  Use raise() when the requested pid is our own process,
 667      otherwise bomb.  */
 668   if (scm_to_int (pid) == getpid ())
 669     {
 670       if (raise (scm_to_int (sig)) != 0)
 671         {
 672         err:
 673           SCM_SYSERROR;
 674         }
 675       else
 676         {
 677           errno = ENOSYS;
 678           goto err;
 679         }
 680     }
 681 #endif
 682   return SCM_UNSPECIFIED;
 683 }
 684 #undef FUNC_NAME
 685
 686 #ifdef HAVE_WAITPID
 687 SCM_DEFINE (scm_waitpid, "waitpid", 1, 1, 0,
 688             (SCM pid, SCM options),
 689             "This procedure collects status information from a child process which\n"
 690             "has terminated or (optionally) stopped.  Normally it will\n"
 691             "suspend the calling process until this can be done.  If more than one\n"
 692             "child process is eligible then one will be chosen by the operating system.\n\n"
 693             "The value of @var{pid} determines the behaviour:\n\n"
 694             "@table @r\n"
 695             "@item @var{pid} greater than 0\n"
 696             "Request status information from the specified child process.\n"
 697             "@item @var{pid} equal to -1 or WAIT_ANY\n"
 698             "Request status information for any child process.\n"
 699             "@item @var{pid} equal to 0 or WAIT_MYPGRP\n"
 700             "Request status information for any child process in the current process\n"
 701             "group.\n"
 702             "@item @var{pid} less than -1\n"
 703             "Request status information for any child process whose process group ID\n"
 704             "is -@var{pid}.\n"
 705             "@end table\n\n"
 706             "The @var{options} argument, if supplied, should be the bitwise OR of the\n"
 707             "values of zero or more of the following variables:\n\n"
 708             "@defvar WNOHANG\n"
 709             "Return immediately even if there are no child processes to be collected.\n"
 710             "@end defvar\n\n"
 711             "@defvar WUNTRACED\n"
 712             "Report status information for stopped processes as well as terminated\n"
 713             "processes.\n"
 714             "@end defvar\n\n"
 715             "The return value is a pair containing:\n\n"
 716             "@enumerate\n"
 717             "@item\n"
 718             "The process ID of the child process, or 0 if @code{WNOHANG} was\n"
 719             "specified and no process was collected.\n"
 720             "@item\n"
 721             "The integer status value.\n"
 722             "@end enumerate")
 723 #define FUNC_NAME s_scm_waitpid
 724 {
 725   int i;
 726   int status;
 727   int ioptions;
 728   if (SCM_UNBNDP (options))
 729     ioptions = 0;
 730   else
 731     {
 732       /* Flags are interned in scm_init_posix.  */
 733       ioptions = scm_to_int (options);
 734     }
 735   SCM_SYSCALL (i = waitpid (scm_to_int (pid), &status, ioptions));
 736   if (i == -1)
 737     SCM_SYSERROR;
 738   return scm_cons (scm_from_int (i), scm_from_int (status));
 739 }
 740 #undef FUNC_NAME
 741 #endif /* HAVE_WAITPID */
 742
 743 #ifndef __MINGW32__
 744 SCM_DEFINE (scm_status_exit_val, "status:exit-val", 1, 0, 0,
 745             (SCM status),
 746             "Return the exit status value, as would be set if a process\n"
 747             "ended normally through a call to @code{exit} or @code{_exit},\n"
 748             "if any, otherwise @code{#f}.")
 749 #define FUNC_NAME s_scm_status_exit_val
 750 {
 751   int lstatus;
 752
 753   /* On Ultrix, the WIF... macros assume their argument is an lvalue;
 754      go figure.  */
 755   lstatus = scm_to_int (status);
 756   if (WIFEXITED (lstatus))
 757     return (scm_from_int (WEXITSTATUS (lstatus)));
 758   else
 759     return SCM_BOOL_F;
 760 }
 761 #undef FUNC_NAME
 762
 763 SCM_DEFINE (scm_status_term_sig, "status:term-sig", 1, 0, 0,
 764             (SCM status),
 765             "Return the signal number which terminated the process, if any,\n"
 766             "otherwise @code{#f}.")
 767 #define FUNC_NAME s_scm_status_term_sig
 768 {
 769   int lstatus;
 770
 771   lstatus = scm_to_int (status);
 772   if (WIFSIGNALED (lstatus))
 773     return scm_from_int (WTERMSIG (lstatus));
 774   else
 775     return SCM_BOOL_F;
 776 }
 777 #undef FUNC_NAME
 778
 779 SCM_DEFINE (scm_status_stop_sig, "status:stop-sig", 1, 0, 0,
 780             (SCM status),
 781             "Return the signal number which stopped the process, if any,\n"
 782             "otherwise @code{#f}.")
 783 #define FUNC_NAME s_scm_status_stop_sig
 784 {
 785   int lstatus;
 786
 787   lstatus = scm_to_int (status);
 788   if (WIFSTOPPED (lstatus))
 789     return scm_from_int (WSTOPSIG (lstatus));
 790   else
 791     return SCM_BOOL_F;
 792 }
 793 #undef FUNC_NAME
 794 #endif /* __MINGW32__ */
 795
 796 #ifdef HAVE_GETPPID
 797 SCM_DEFINE (scm_getppid, "getppid", 0, 0, 0,
 798             (),
 799             "Return an integer representing the process ID of the parent\n"
 800             "process.")
 801 #define FUNC_NAME s_scm_getppid
 802 {
 803   return scm_from_int (getppid ());
 804 }
 805 #undef FUNC_NAME
 806 #endif /* HAVE_GETPPID */
 807
 808
 809 #ifndef __MINGW32__
 810 SCM_DEFINE (scm_getuid, "getuid", 0, 0, 0,
 811             (),
 812             "Return an integer representing the current real user ID.")
 813 #define FUNC_NAME s_scm_getuid
 814 {
 815   return scm_from_int (getuid ());
 816 }
 817 #undef FUNC_NAME
 818
 819
 820
 821 SCM_DEFINE (scm_getgid, "getgid", 0, 0, 0,
 822             (),
 823             "Return an integer representing the current real group ID.")
 824 #define FUNC_NAME s_scm_getgid
 825 {
 826   return scm_from_int (getgid ());
 827 }
 828 #undef FUNC_NAME
 829
 830
 831
 832 SCM_DEFINE (scm_geteuid, "geteuid", 0, 0, 0,
 833             (),
 834             "Return an integer representing the current effective user ID.\n"
 835             "If the system does not support effective IDs, then the real ID\n"
 836             "is returned.  @code{(provided? 'EIDs)} reports whether the\n"
 837             "system supports effective IDs.")
 838 #define FUNC_NAME s_scm_geteuid
 839 {
 840 #ifdef HAVE_GETEUID
 841   return scm_from_int (geteuid ());
 842 #else
 843   return scm_from_int (getuid ());
 844 #endif
 845 }
 846 #undef FUNC_NAME
 847
 848
 849 SCM_DEFINE (scm_getegid, "getegid", 0, 0, 0,
 850             (),
 851             "Return an integer representing the current effective group ID.\n"
 852             "If the system does not support effective IDs, then the real ID\n"
 853             "is returned.  @code{(provided? 'EIDs)} reports whether the\n"
 854             "system supports effective IDs.")
 855 #define FUNC_NAME s_scm_getegid
 856 {
 857 #ifdef HAVE_GETEUID
 858   return scm_from_int (getegid ());
 859 #else
 860   return scm_from_int (getgid ());
 861 #endif
 862 }
 863 #undef FUNC_NAME
 864
 865
 866 SCM_DEFINE (scm_setuid, "setuid", 1, 0, 0,
 867             (SCM id),
 868             "Sets both the real and effective user IDs to the integer @var{id}, provided\n"
 869             "the process has appropriate privileges.\n"
 870             "The return value is unspecified.")
 871 #define FUNC_NAME s_scm_setuid
 872 {
 873   if (setuid (scm_to_int (id)) != 0)
 874     SCM_SYSERROR;
 875   return SCM_UNSPECIFIED;
 876 }
 877 #undef FUNC_NAME
 878
 879 SCM_DEFINE (scm_setgid, "setgid", 1, 0, 0,
 880             (SCM id),
 881             "Sets both the real and effective group IDs to the integer @var{id}, provided\n"
 882             "the process has appropriate privileges.\n"
 883             "The return value is unspecified.")
 884 #define FUNC_NAME s_scm_setgid
 885 {
 886   if (setgid (scm_to_int (id)) != 0)
 887     SCM_SYSERROR;
 888   return SCM_UNSPECIFIED;
 889 }
 890 #undef FUNC_NAME
 891
 892 SCM_DEFINE (scm_seteuid, "seteuid", 1, 0, 0,
 893             (SCM id),
 894             "Sets the effective user ID to the integer @var{id}, provided the process\n"
 895             "has appropriate privileges.  If effective IDs are not supported, the\n"
 896             "real ID is set instead -- @code{(provided? 'EIDs)} reports whether the\n"
 897             "system supports effective IDs.\n"
 898             "The return value is unspecified.")
 899 #define FUNC_NAME s_scm_seteuid
 900 {
 901   int rv;
 902
 903 #ifdef HAVE_SETEUID
 904   rv = seteuid (scm_to_int (id));
 905 #else
 906   rv = setuid (scm_to_int (id));
 907 #endif
 908   if (rv != 0)
 909     SCM_SYSERROR;
 910   return SCM_UNSPECIFIED;
 911 }
 912 #undef FUNC_NAME
 913 #endif /* __MINGW32__ */
 914
 915
 916 #ifdef HAVE_SETEGID
 917 SCM_DEFINE (scm_setegid, "setegid", 1, 0, 0,
 918             (SCM id),
 919             "Sets the effective group ID to the integer @var{id}, provided the process\n"
 920             "has appropriate privileges.  If effective IDs are not supported, the\n"
 921             "real ID is set instead -- @code{(provided? 'EIDs)} reports whether the\n"
 922             "system supports effective IDs.\n"
 923             "The return value is unspecified.")
 924 #define FUNC_NAME s_scm_setegid
 925 {
 926   int rv;
 927
 928 #ifdef HAVE_SETEUID
 929   rv = setegid (scm_to_int (id));
 930 #else
 931   rv = setgid (scm_to_int (id));
 932 #endif
 933   if (rv != 0)
 934     SCM_SYSERROR;
 935   return SCM_UNSPECIFIED;
 936
 937 }
 938 #undef FUNC_NAME
 939 #endif
 940
 941
 942 #ifdef HAVE_GETPGRP
 943 SCM_DEFINE (scm_getpgrp, "getpgrp", 0, 0, 0,
 944             (),
 945             "Return an integer representing the current process group ID.\n"
 946             "This is the POSIX definition, not BSD.")
 947 #define FUNC_NAME s_scm_getpgrp
 948 {
 949   int (*fn)();
 950   fn = (int (*) ()) getpgrp;
 951   return scm_from_int (fn (0));
 952 }
 953 #undef FUNC_NAME
 954 #endif /* HAVE_GETPGRP */
 955
 956
 957 #ifdef HAVE_SETPGID
 958 SCM_DEFINE (scm_setpgid, "setpgid", 2, 0, 0,
 959             (SCM pid, SCM pgid),
 960             "Move the process @var{pid} into the process group @var{pgid}.  @var{pid} or\n"
 961             "@var{pgid} must be integers: they can be zero to indicate the ID of the\n"
 962             "current process.\n"
 963             "Fails on systems that do not support job control.\n"
 964             "The return value is unspecified.")
 965 #define FUNC_NAME s_scm_setpgid
 966 {
 967   /* FIXME(?): may be known as setpgrp.  */
 968   if (setpgid (scm_to_int (pid), scm_to_int (pgid)) != 0)
 969     SCM_SYSERROR;
 970   return SCM_UNSPECIFIED;
 971 }
 972 #undef FUNC_NAME
 973 #endif /* HAVE_SETPGID */
 974
 975 #ifdef HAVE_SETSID
 976 SCM_DEFINE (scm_setsid, "setsid", 0, 0, 0,
 977             (),
 978             "Creates a new session.  The current process becomes the session leader\n"
 979             "and is put in a new process group.  The process will be detached\n"
 980             "from its controlling terminal if it has one.\n"
 981             "The return value is an integer representing the new process group ID.")
 982 #define FUNC_NAME s_scm_setsid
 983 {
 984   pid_t sid = setsid ();
 985   if (sid == -1)
 986     SCM_SYSERROR;
 987   return SCM_UNSPECIFIED;
 988 }
 989 #undef FUNC_NAME
 990 #endif /* HAVE_SETSID */
 991
 992 #ifdef HAVE_GETSID
 993 SCM_DEFINE (scm_getsid, "getsid", 1, 0, 0,
 994             (SCM pid),
 995             "Returns the session ID of process @var{pid}.  (The session\n"
 996             "ID of a process is the process group ID of its session leader.)")
 997 #define FUNC_NAME s_scm_getsid
 998 {
 999   return scm_from_int (getsid (scm_to_int (pid)));
1000 }
1001 #undef FUNC_NAME
1002 #endif /* HAVE_GETSID */
1003
1004
1005 /* ttyname returns its result in a single static buffer, hence
1006    scm_i_misc_mutex for thread safety.  In glibc 2.3.2 two threads
1007    continuously calling ttyname will otherwise get an overwrite quite
1008    easily.
1009
1010    ttyname_r (when available) could be used instead of scm_i_misc_mutex, but
1011    there's probably little to be gained in either speed or parallelism.  */
1012
1013 #ifdef HAVE_TTYNAME
1014 SCM_DEFINE (scm_ttyname, "ttyname", 1, 0, 0,
1015             (SCM port),
1016             "Return a string with the name of the serial terminal device\n"
1017             "underlying @var{port}.")
1018 #define FUNC_NAME s_scm_ttyname
1019 {
1020   char *result;
1021   int fd, err;
1022   SCM ret = SCM_BOOL_F;
1023
1024   port = SCM_COERCE_OUTPORT (port);
1025   SCM_VALIDATE_OPPORT (1, port);
1026   if (!SCM_FPORTP (port))
1027     return SCM_BOOL_F;
1028   fd = SCM_FPORT_FDES (port);
1029
1030   scm_i_scm_pthread_mutex_lock (&scm_i_misc_mutex);
1031
1032   SCM_SYSCALL (result = ttyname (fd));
1033   err = errno;
1034   if (result != NULL)
1035     result = strdup (result);
1036
1037   scm_i_pthread_mutex_unlock (&scm_i_misc_mutex);
1038
1039   if (!result)
1040     {
1041       errno = err;
1042       SCM_SYSERROR;
1043     }
1044   else
1045     ret = scm_take_locale_string (result);
1046
1047   return ret;
1048 }
1049 #undef FUNC_NAME
1050 #endif /* HAVE_TTYNAME */
1051
1052
1053 /* For thread safety "buf" is used instead of NULL for the ctermid static
1054    buffer.  Actually it's unlikely the controlling terminal will change
1055    during program execution, and indeed on glibc (2.3.2) it's always just
1056    "/dev/tty", but L_ctermid on the stack is easy and fast and guarantees
1057    safety everywhere.  */
1058 #ifdef HAVE_CTERMID
1059 SCM_DEFINE (scm_ctermid, "ctermid", 0, 0, 0,
1060             (),
1061             "Return a string containing the file name of the controlling\n"
1062             "terminal for the current process.")
1063 #define FUNC_NAME s_scm_ctermid
1064 {
1065   char buf[L_ctermid];
1066   char *result = ctermid (buf);
1067   if (*result == '\0')
1068     SCM_SYSERROR;
1069   return scm_from_locale_string (result);
1070 }
1071 #undef FUNC_NAME
1072 #endif /* HAVE_CTERMID */
1073
1074 #ifdef HAVE_TCGETPGRP
1075 SCM_DEFINE (scm_tcgetpgrp, "tcgetpgrp", 1, 0, 0,
1076             (SCM port),
1077             "Return the process group ID of the foreground process group\n"
1078             "associated with the terminal open on the file descriptor\n"
1079             "underlying @var{port}.\n"
1080             "\n"
1081             "If there is no foreground process group, the return value is a\n"
1082             "number greater than 1 that does not match the process group ID\n"
1083             "of any existing process group.  This can happen if all of the\n"
1084             "processes in the job that was formerly the foreground job have\n"
1085             "terminated, and no other job has yet been moved into the\n"
1086             "foreground.")
1087 #define FUNC_NAME s_scm_tcgetpgrp
1088 {
1089   int fd;
1090   pid_t pgid;
1091
1092   port = SCM_COERCE_OUTPORT (port);
1093
1094   SCM_VALIDATE_OPFPORT (1, port);
1095   fd = SCM_FPORT_FDES (port);
1096   if ((pgid = tcgetpgrp (fd)) == -1)
1097     SCM_SYSERROR;
1098   return scm_from_int (pgid);
1099 }
1100 #undef FUNC_NAME
1101 #endif /* HAVE_TCGETPGRP */
1102
1103 #ifdef HAVE_TCSETPGRP
1104 SCM_DEFINE (scm_tcsetpgrp, "tcsetpgrp", 2, 0, 0,
1105             (SCM port, SCM pgid),
1106             "Set the foreground process group ID for the terminal used by the file\n"
1107             "descriptor underlying @var{port} to the integer @var{pgid}.\n"
1108             "The calling process\n"
1109             "must be a member of the same session as @var{pgid} and must have the same\n"
1110             "controlling terminal.  The return value is unspecified.")
1111 #define FUNC_NAME s_scm_tcsetpgrp
1112 {
1113   int fd;
1114
1115   port = SCM_COERCE_OUTPORT (port);
1116
1117   SCM_VALIDATE_OPFPORT (1, port);
1118   fd = SCM_FPORT_FDES (port);
1119   if (tcsetpgrp (fd, scm_to_int (pgid)) == -1)
1120     SCM_SYSERROR;
1121   return SCM_UNSPECIFIED;
1122 }
1123 #undef FUNC_NAME
1124 #endif /* HAVE_TCSETPGRP */
1125
1126 SCM_DEFINE (scm_execl, "execl", 1, 0, 1,
1127             (SCM filename, SCM args),
1128             "Executes the file named by @var{filename} as a new process image.\n"
1129             "The remaining arguments are supplied to the process; from a C program\n"
1130             "they are accessible as the @code{argv} argument to @code{main}.\n"
1131             "Conventionally the first @var{arg} is the same as @var{filename}.\n"
1132             "All arguments must be strings.\n\n"
1133             "If @var{arg} is missing, @var{path} is executed with a null\n"
1134             "argument list, which may have system-dependent side-effects.\n\n"
1135             "This procedure is currently implemented using the @code{execv} system\n"
1136             "call, but we call it @code{execl} because of its Scheme calling interface.")
1137 #define FUNC_NAME s_scm_execl
1138 {
1139   char *exec_file;
1140   char **exec_argv;
1141
1142   scm_dynwind_begin (0);
1143
1144   exec_file = scm_to_locale_string (filename);
1145   scm_dynwind_free (exec_file);
1146
1147   exec_argv = scm_i_allocate_string_pointers (args);
1148
1149   execv (exec_file,
1150 #ifdef __MINGW32__
1151          /* extra "const" in mingw formals, provokes warning from gcc */
1152          (const char * const *)
1153 #endif
1154          exec_argv);
1155   SCM_SYSERROR;
1156
1157   /* not reached.  */
1158   scm_dynwind_end ();
1159   return SCM_BOOL_F;
1160 }
1161 #undef FUNC_NAME
1162
1163 SCM_DEFINE (scm_execlp, "execlp", 1, 0, 1,
1164             (SCM filename, SCM args),
1165             "Similar to @code{execl}, however if\n"
1166             "@var{filename} does not contain a slash\n"
1167             "then the file to execute will be located by searching the\n"
1168             "directories listed in the @code{PATH} environment variable.\n\n"
1169             "This procedure is currently implemented using the @code{execvp} system\n"
1170             "call, but we call it @code{execlp} because of its Scheme calling interface.")
1171 #define FUNC_NAME s_scm_execlp
1172 {
1173   char *exec_file;
1174   char **exec_argv;
1175
1176   scm_dynwind_begin (0);
1177
1178   exec_file = scm_to_locale_string (filename);
1179   scm_dynwind_free (exec_file);
1180
1181   exec_argv = scm_i_allocate_string_pointers (args);
1182
1183   execvp (exec_file,
1184 #ifdef __MINGW32__
1185           /* extra "const" in mingw formals, provokes warning from gcc */
1186           (const char * const *)
1187 #endif
1188           exec_argv);
1189   SCM_SYSERROR;
1190
1191   /* not reached.  */
1192   scm_dynwind_end ();
1193   return SCM_BOOL_F;
1194 }
1195 #undef FUNC_NAME
1196
1197
1198 /* OPTIMIZE-ME: scm_execle doesn't need malloced copies of the environment
1199    list strings the way environ_list_to_c gives.  */
1200
1201 SCM_DEFINE (scm_execle, "execle", 2, 0, 1,
1202             (SCM filename, SCM env, SCM args),
1203             "Similar to @code{execl}, but the environment of the new process is\n"
1204             "specified by @var{env}, which must be a list of strings as returned by the\n"
1205             "@code{environ} procedure.\n\n"
1206             "This procedure is currently implemented using the @code{execve} system\n"
1207             "call, but we call it @code{execle} because of its Scheme calling interface.")
1208 #define FUNC_NAME s_scm_execle
1209 {
1210   char **exec_argv;
1211   char **exec_env;
1212   char *exec_file;
1213
1214   scm_dynwind_begin (0);
1215
1216   exec_file = scm_to_locale_string (filename);
1217   scm_dynwind_free (exec_file);
1218
1219   exec_argv = scm_i_allocate_string_pointers (args);
1220   exec_env = scm_i_allocate_string_pointers (env);
1221
1222   execve (exec_file,
1223 #ifdef __MINGW32__
1224           /* extra "const" in mingw formals, provokes warning from gcc */
1225           (const char * const *)
1226 #endif
1227           exec_argv,
1228 #ifdef __MINGW32__
1229           /* extra "const" in mingw formals, provokes warning from gcc */
1230           (const char * const *)
1231 #endif
1232           exec_env);
1233   SCM_SYSERROR;
1234
1235   /* not reached.  */
1236   scm_dynwind_end ();
1237   return SCM_BOOL_F;
1238 }
1239 #undef FUNC_NAME
1240
1241 #ifdef HAVE_FORK
1242 SCM_DEFINE (scm_fork, "primitive-fork", 0, 0, 0,
1243             (),
1244             "Creates a new \"child\" process by duplicating the current \"parent\" process.\n"
1245             "In the child the return value is 0.  In the parent the return value is\n"
1246             "the integer process ID of the child.\n\n"
1247             "This procedure has been renamed from @code{fork} to avoid a naming conflict\n"
1248             "with the scsh fork.")
1249 #define FUNC_NAME s_scm_fork
1250 {
1251   int pid;
1252   scm_i_finalizer_pre_fork ();
1253   if (scm_ilength (scm_all_threads ()) != 1)
1254     /* Other threads may be holding on to resources that Guile needs --
1255        it is not safe to permit one thread to fork while others are
1256        running.
1257
1258        In addition, POSIX clearly specifies that if a multi-threaded
1259        program forks, the child must only call functions that are
1260        async-signal-safe.  We can't guarantee that in general.  The best
1261        we can do is to allow forking only very early, before any call to
1262        sigaction spawns the signal-handling thread.  */
1263     scm_display
1264       (scm_from_latin1_string
1265        ("warning: call to primitive-fork while multiple threads are running;\n"
1266         "         further behavior unspecified.  See \"Processes\" in the\n"
1267         "         manual, for more information.\n"),
1268        scm_current_warning_port ());
1269   pid = fork ();
1270   if (pid == -1)
1271     SCM_SYSERROR;
1272   return scm_from_int (pid);
1273 }
1274 #undef FUNC_NAME
1275
1276 /* Since Guile uses threads, we have to be very careful to avoid calling
1277    functions that are not async-signal-safe in the child.  That's why
1278    this function is implemented in C.  */
1279 static SCM
1280 scm_open_process (SCM mode, SCM prog, SCM args)
1281 #define FUNC_NAME "open-process"
1282 {
1283   long mode_bits;
1284   int reading, writing;
1285   int c2p[2]; /* Child to parent.  */
1286   int p2c[2]; /* Parent to child.  */
1287   int in = -1, out = -1, err = -1;
1288   int pid;
1289   char *exec_file;
1290   char **exec_argv;
1291   int max_fd = 1024;
1292
1293   exec_file = scm_to_locale_string (prog);
1294   exec_argv = scm_i_allocate_string_pointers (scm_cons (prog, args));
1295
1296   mode_bits = scm_i_mode_bits (mode);
1297   reading = mode_bits & SCM_RDNG;
1298   writing = mode_bits & SCM_WRTNG;
1299
1300   if (reading)
1301     {
1302       if (pipe (c2p))
1303         {
1304           int errno_save = errno;
1305           free (exec_file);
1306           errno = errno_save;
1307           SCM_SYSERROR;
1308         }
1309       out = c2p[1];
1310     }
1311
1312   if (writing)
1313     {
1314       if (pipe (p2c))
1315         {
1316           int errno_save = errno;
1317           free (exec_file);
1318           if (reading)
1319             {
1320               close (c2p[0]);
1321               close (c2p[1]);
1322             }
1323           errno = errno_save;
1324           SCM_SYSERROR;
1325         }
1326       in = p2c[0];
1327     }
1328
1329   {
1330     SCM port;
1331
1332     if (SCM_OPOUTFPORTP ((port = scm_current_error_port ())))
1333       err = SCM_FPORT_FDES (port);
1334     if (out == -1 && SCM_OPOUTFPORTP ((port = scm_current_output_port ())))
1335       out = SCM_FPORT_FDES (port);
1336     if (in == -1 && SCM_OPINFPORTP ((port = scm_current_input_port ())))
1337       in = SCM_FPORT_FDES (port);
1338   }
1339
1340 #if defined (HAVE_GETRLIMIT) && defined (RLIMIT_NOFILE)
1341   {
1342     struct rlimit lim = { 0, 0 };
1343     if (getrlimit (RLIMIT_NOFILE, &lim) == 0)
1344       max_fd = lim.rlim_cur;
1345   }
1346 #endif
1347
1348   pid = fork ();
1349
1350   if (pid == -1)
1351     {
1352       int errno_save = errno;
1353       free (exec_file);
1354       if (reading)
1355         {
1356           close (c2p[0]);
1357           close (c2p[1]);
1358         }
1359       if (writing)
1360         {
1361           close (p2c[0]);
1362           close (p2c[1]);
1363         }
1364       errno = errno_save;
1365       SCM_SYSERROR;
1366     }
1367
1368   if (pid)
1369     /* Parent. */
1370     {
1371       SCM read_port = SCM_BOOL_F, write_port = SCM_BOOL_F;
1372
1373       /* There is no sense in catching errors on close().  */
1374       if (reading)
1375         {
1376           close (c2p[1]);
1377           read_port = scm_fdes_to_port (c2p[0], "r", sym_read_pipe);
1378           scm_setvbuf (read_port, scm_from_int (_IONBF), SCM_UNDEFINED);
1379         }
1380       if (writing)
1381         {
1382           close (p2c[0]);
1383           write_port = scm_fdes_to_port (p2c[1], "w", sym_write_pipe);
1384           scm_setvbuf (write_port, scm_from_int (_IONBF), SCM_UNDEFINED);
1385         }
1386
1387       return scm_values
1388         (scm_list_3 (read_port, write_port, scm_from_int (pid)));
1389     }
1390
1391   /* The child.  */
1392   if (reading)
1393     close (c2p[0]);
1394   if (writing)
1395     close (p2c[1]);
1396
1397   /* Close all file descriptors in ports inherited from the parent
1398      except for in, out, and err.  Heavy-handed, but robust.  */
1399   while (max_fd--)
1400     if (max_fd != in && max_fd != out && max_fd != err)
1401       close (max_fd);
1402
1403   /* Ignore errors on these open() calls.  */
1404   if (in == -1)
1405     in = open ("/dev/null", O_RDONLY);
1406   if (out == -1)
1407     out = open ("/dev/null", O_WRONLY);
1408   if (err == -1)
1409     err = open ("/dev/null", O_WRONLY);
1410
1411   if (in > 0)
1412     {
1413       if (out == 0)
1414         do out = dup (out); while (errno == EINTR);
1415       if (err == 0)
1416         do err = dup (err); while (errno == EINTR);
1417       do dup2 (in, 0); while (errno == EINTR);
1418       close (in);
1419     }
1420   if (out > 1)
1421     {
1422       if (err == 1)
1423         do err = dup (err); while (errno == EINTR);
1424       do dup2 (out, 1); while (errno == EINTR);
1425       close (out);
1426     }
1427   if (err > 2)
1428     {
1429       do dup2 (err, 2); while (errno == EINTR);
1430       close (err);
1431     }
1432
1433   execvp (exec_file,
1434 #ifdef __MINGW32__
1435           /* extra "const" in mingw formals, provokes warning from gcc */
1436           (const char * const *)
1437 #endif
1438           exec_argv);
1439
1440   /* The exec failed!  There is nothing sensible to do.  */
1441   if (err > 0)
1442     {
1443       char *msg = strerror (errno);
1444       fprintf (fdopen (err, "a"), "In execlp of %s: %s\n",
1445                exec_file, msg);
1446     }
1447
1448   _exit (EXIT_FAILURE);
1449   /* Not reached.  */
1450   return SCM_BOOL_F;
1451 }
1452 #undef FUNC_NAME
1453 #endif /* HAVE_FORK */
1454
1455 #ifdef __MINGW32__
1456 # include "win32-uname.h"
1457 #endif
1458
1459 #if defined (HAVE_UNAME) || defined (__MINGW32__)
1460 SCM_DEFINE (scm_uname, "uname", 0, 0, 0,
1461             (),
1462             "Return an object with some information about the computer\n"
1463             "system the program is running on.")
1464 #define FUNC_NAME s_scm_uname
1465 {
1466   struct utsname buf;
1467   SCM result = scm_c_make_vector (5, SCM_UNSPECIFIED);
1468   if (uname (&buf) < 0)
1469     SCM_SYSERROR;
1470   SCM_SIMPLE_VECTOR_SET(result, 0, scm_from_locale_string (buf.sysname));
1471   SCM_SIMPLE_VECTOR_SET(result, 1, scm_from_locale_string (buf.nodename));
1472   SCM_SIMPLE_VECTOR_SET(result, 2, scm_from_locale_string (buf.release));
1473   SCM_SIMPLE_VECTOR_SET(result, 3, scm_from_locale_string (buf.version));
1474   SCM_SIMPLE_VECTOR_SET(result, 4, scm_from_locale_string (buf.machine));
1475 /*
1476    a linux special?
1477   SCM_SIMPLE_VECTOR_SET(result, 5, scm_from_locale_string (buf.domainname));
1478 */
1479   return result;
1480 }
1481 #undef FUNC_NAME
1482 #endif /* HAVE_UNAME */
1483
1484 SCM_DEFINE (scm_environ, "environ", 0, 1, 0,
1485             (SCM env),
1486             "If @var{env} is omitted, return the current environment (in the\n"
1487             "Unix sense) as a list of strings.  Otherwise set the current\n"
1488             "environment, which is also the default environment for child\n"
1489             "processes, to the supplied list of strings.  Each member of\n"
1490             "@var{env} should be of the form @code{NAME=VALUE} and values of\n"
1491             "@code{NAME} should not be duplicated.  If @var{env} is supplied\n"
1492             "then the return value is unspecified.")
1493 #define FUNC_NAME s_scm_environ
1494 {
1495   if (SCM_UNBNDP (env))
1496     return scm_makfromstrs (-1, environ);
1497   else
1498     {
1499       environ = scm_i_allocate_string_pointers (env);
1500       return SCM_UNSPECIFIED;
1501     }
1502 }
1503 #undef FUNC_NAME
1504
1505 #ifdef L_tmpnam
1506
1507 SCM_DEFINE (scm_tmpnam, "tmpnam", 0, 0, 0,
1508             (),
1509             "Return a name in the file system that does not match any\n"
1510             "existing file.  However there is no guarantee that another\n"
1511             "process will not create the file after @code{tmpnam} is called.\n"
1512             "Care should be taken if opening the file, e.g., use the\n"
1513             "@code{O_EXCL} open flag or use @code{mkstemp!} instead.")
1514 #define FUNC_NAME s_scm_tmpnam
1515 {
1516   char name[L_tmpnam];
1517   char *rv;
1518
1519   SCM_SYSCALL (rv = tmpnam (name));
1520   if (rv == NULL)
1521     /* not SCM_SYSERROR since errno probably not set.  */
1522     SCM_MISC_ERROR ("tmpnam failed", SCM_EOL);
1523   return scm_from_locale_string (name);
1524 }
1525 #undef FUNC_NAME
1526
1527 #endif
1528
1529 SCM_DEFINE (scm_tmpfile, "tmpfile", 0, 0, 0,
1530             (void),
1531             "Return an input/output port to a unique temporary file\n"
1532             "named using the path prefix @code{P_tmpdir} defined in\n"
1533             "@file{stdio.h}.\n"
1534             "The file is automatically deleted when the port is closed\n"
1535             "or the program terminates.")
1536 #define FUNC_NAME s_scm_tmpfile
1537 {
1538   FILE *rv;
1539   int fd;
1540
1541   if (! (rv = tmpfile ()))
1542     SCM_SYSERROR;
1543
1544 #ifndef __MINGW32__
1545   fd = dup (fileno (rv));
1546   fclose (rv);
1547 #else
1548   fd = fileno (rv);
1549   /* FIXME: leaking the file, it will never be closed! */
1550 #endif
1551
1552   return scm_fdes_to_port (fd, "w+", SCM_BOOL_F);
1553 }
1554 #undef FUNC_NAME
1555
1556 SCM_DEFINE (scm_utime, "utime", 1, 5, 0,
1557             (SCM pathname, SCM actime, SCM modtime, SCM actimens, SCM modtimens,
1558              SCM flags),
1559             "@code{utime} sets the access and modification times for the\n"
1560             "file named by @var{pathname}.  If @var{actime} or @var{modtime} is\n"
1561             "not supplied, then the current time is used.  @var{actime} and\n"
1562             "@var{modtime} must be integer time values as returned by the\n"
1563             "@code{current-time} procedure.\n\n"
1564             "The optional @var{actimens} and @var{modtimens} are nanoseconds\n"
1565             "to add @var{actime} and @var{modtime}. Nanosecond precision is\n"
1566             "only supported on some combinations of file systems and operating\n"
1567             "systems.\n"
1568             "@lisp\n"
1569             "(utime \"foo\" (- (current-time) 3600))\n"
1570             "@end lisp\n"
1571             "will set the access time to one hour in the past and the\n"
1572             "modification time to the current time.")
1573 #define FUNC_NAME s_scm_utime
1574 {
1575   int rv;
1576   time_t atim_sec, mtim_sec;
1577   long atim_nsec, mtim_nsec;
1578   int f;
1579
1580   if (SCM_UNBNDP (actime))
1581     {
1582 #ifdef HAVE_UTIMENSAT
1583       atim_sec = 0;
1584       atim_nsec = UTIME_NOW;
1585 #else
1586       SCM_SYSCALL (time (&atim_sec));
1587       atim_nsec = 0;
1588 #endif
1589     }
1590   else
1591     {
1592       atim_sec = SCM_NUM2ULONG (2, actime);
1593       if (SCM_UNBNDP (actimens))
1594         atim_nsec = 0;
1595       else
1596         atim_nsec = SCM_NUM2LONG (4, actimens);
1597     }
1598
1599   if (SCM_UNBNDP (modtime))
1600     {
1601 #ifdef HAVE_UTIMENSAT
1602       mtim_sec = 0;
1603       mtim_nsec = UTIME_NOW;
1604 #else
1605       SCM_SYSCALL (time (&mtim_sec));
1606       mtim_nsec = 0;
1607 #endif
1608     }
1609   else
1610     {
1611       mtim_sec = SCM_NUM2ULONG (3, modtime);
1612       if (SCM_UNBNDP (modtimens))
1613         mtim_nsec = 0;
1614       else
1615         mtim_nsec = SCM_NUM2LONG (5, modtimens);
1616     }
1617
1618   if (SCM_UNBNDP (flags))
1619     f = 0;
1620   else
1621     f = SCM_NUM2INT (6, flags);
1622
1623 #ifdef HAVE_UTIMENSAT
1624   {
1625     struct timespec times[2];
1626     times[0].tv_sec = atim_sec;
1627     times[0].tv_nsec = atim_nsec;
1628     times[1].tv_sec = mtim_sec;
1629     times[1].tv_nsec = mtim_nsec;
1630
1631     STRING_SYSCALL (pathname, c_pathname,
1632                     rv = utimensat (AT_FDCWD, c_pathname, times, f));
1633   }
1634 #else
1635   {
1636     struct utimbuf utm;
1637     utm.actime = atim_sec;
1638     utm.modtime = mtim_sec;
1639
1640     STRING_SYSCALL (pathname, c_pathname,
1641                     rv = utime (c_pathname, &utm));
1642   }
1643 #endif
1644
1645   if (rv != 0)
1646     SCM_SYSERROR;
1647   return SCM_UNSPECIFIED;
1648 }
1649 #undef FUNC_NAME
1650
1651 SCM_DEFINE (scm_getpid, "getpid", 0, 0, 0,
1652             (),
1653             "Return an integer representing the current process ID.")
1654 #define FUNC_NAME s_scm_getpid
1655 {
1656   return scm_from_ulong (getpid ());
1657 }
1658 #undef FUNC_NAME
1659
1660 SCM_DEFINE (scm_putenv, "putenv", 1, 0, 0,
1661             (SCM str),
1662             "Modifies the environment of the current process, which is also\n"
1663             "the default environment inherited by child processes.  If\n"
1664             "@var{str} is of the form @code{NAME=VALUE} then it will be\n"
1665             "written directly into the environment, replacing any existing\n"
1666             "environment string with name matching @code{NAME}.  If\n"
1667             "@var{str} does not contain an equal sign, then any existing\n"
1668             "string with name matching @var{str} will be removed.\n"
1669             "\n"
1670             "The return value is unspecified.")
1671 #define FUNC_NAME s_scm_putenv
1672 {
1673   int rv;
1674   char *c_str = scm_to_locale_string (str);
1675
1676   /* Leave C_STR in the environment.  */
1677
1678   /* Gnulib's `putenv' module honors the semantics described above.  */
1679   rv = putenv (c_str);
1680   if (rv < 0)
1681     SCM_SYSERROR;
1682
1683   return SCM_UNSPECIFIED;
1684 }
1685 #undef FUNC_NAME
1686
1687 /* This mutex is used to serialize invocations of `setlocale ()' on non-GNU
1688    systems (i.e., systems where a reentrant locale API is not available).  It
1689    is also acquired before calls to `nl_langinfo ()'.  See `i18n.c' for
1690    details.  */
1691 scm_i_pthread_mutex_t scm_i_locale_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER;
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 #ifdef HAVE_FORK
2380   scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION,
2381                             "scm_init_popen",
2382                             (scm_t_extension_init_func) scm_init_popen,
2383                             NULL);
2384 #endif  /* HAVE_FORK */
2385 }
2386
2387 /*
2388   Local Variables:
2389   c-file-style: "gnu"
2390   End:
2391 */