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   if (scm_ilength (scm_all_threads ()) != 1)
1253     /* Other threads may be holding on to resources that Guile needs --
1254        it is not safe to permit one thread to fork while others are
1255        running.
1256
1257        In addition, POSIX clearly specifies that if a multi-threaded
1258        program forks, the child must only call functions that are
1259        async-signal-safe.  We can't guarantee that in general.  The best
1260        we can do is to allow forking only very early, before any call to
1261        sigaction spawns the signal-handling thread.  */
1262     scm_display
1263       (scm_from_latin1_string
1264        ("warning: call to primitive-fork while multiple threads are running;\n"
1265         "         further behavior unspecified.  See \"Processes\" in the\n"
1266         "         manual, for more information.\n"),
1267        scm_current_warning_port ());
1268   pid = fork ();
1269   if (pid == -1)
1270     SCM_SYSERROR;
1271   return scm_from_int (pid);
1272 }
1273 #undef FUNC_NAME
1274
1275 /* Since Guile uses threads, we have to be very careful to avoid calling
1276    functions that are not async-signal-safe in the child.  That's why
1277    this function is implemented in C.  */
1278 static SCM
1279 scm_open_process (SCM mode, SCM prog, SCM args)
1280 #define FUNC_NAME "open-process"
1281 {
1282   long mode_bits;
1283   int reading, writing;
1284   int c2p[2]; /* Child to parent.  */
1285   int p2c[2]; /* Parent to child.  */
1286   int in = -1, out = -1, err = -1;
1287   int pid;
1288   char *exec_file;
1289   char **exec_argv;
1290   int max_fd = 1024;
1291
1292   exec_file = scm_to_locale_string (prog);
1293   exec_argv = scm_i_allocate_string_pointers (scm_cons (prog, args));
1294
1295   mode_bits = scm_i_mode_bits (mode);
1296   reading = mode_bits & SCM_RDNG;
1297   writing = mode_bits & SCM_WRTNG;
1298
1299   if (reading)
1300     {
1301       if (pipe (c2p))
1302         {
1303           int errno_save = errno;
1304           free (exec_file);
1305           errno = errno_save;
1306           SCM_SYSERROR;
1307         }
1308       out = c2p[1];
1309     }
1310
1311   if (writing)
1312     {
1313       if (pipe (p2c))
1314         {
1315           int errno_save = errno;
1316           free (exec_file);
1317           if (reading)
1318             {
1319               close (c2p[0]);
1320               close (c2p[1]);
1321             }
1322           errno = errno_save;
1323           SCM_SYSERROR;
1324         }
1325       in = p2c[0];
1326     }
1327
1328   {
1329     SCM port;
1330
1331     if (SCM_OPOUTFPORTP ((port = scm_current_error_port ())))
1332       err = SCM_FPORT_FDES (port);
1333     if (out == -1 && SCM_OPOUTFPORTP ((port = scm_current_output_port ())))
1334       out = SCM_FPORT_FDES (port);
1335     if (in == -1 && SCM_OPINFPORTP ((port = scm_current_input_port ())))
1336       in = SCM_FPORT_FDES (port);
1337   }
1338
1339 #if defined (HAVE_GETRLIMIT) && defined (RLIMIT_NOFILE)
1340   {
1341     struct rlimit lim = { 0, 0 };
1342     if (getrlimit (RLIMIT_NOFILE, &lim) == 0)
1343       max_fd = lim.rlim_cur;
1344   }
1345 #endif
1346
1347   pid = fork ();
1348
1349   if (pid == -1)
1350     {
1351       int errno_save = errno;
1352       free (exec_file);
1353       if (reading)
1354         {
1355           close (c2p[0]);
1356           close (c2p[1]);
1357         }
1358       if (writing)
1359         {
1360           close (p2c[0]);
1361           close (p2c[1]);
1362         }
1363       errno = errno_save;
1364       SCM_SYSERROR;
1365     }
1366
1367   if (pid)
1368     /* Parent. */
1369     {
1370       SCM read_port = SCM_BOOL_F, write_port = SCM_BOOL_F;
1371
1372       /* There is no sense in catching errors on close().  */
1373       if (reading)
1374         {
1375           close (c2p[1]);
1376           read_port = scm_fdes_to_port (c2p[0], "r", sym_read_pipe);
1377           scm_setvbuf (read_port, scm_from_int (_IONBF), SCM_UNDEFINED);
1378         }
1379       if (writing)
1380         {
1381           close (p2c[0]);
1382           write_port = scm_fdes_to_port (p2c[1], "w", sym_write_pipe);
1383           scm_setvbuf (write_port, scm_from_int (_IONBF), SCM_UNDEFINED);
1384         }
1385
1386       return scm_values
1387         (scm_list_3 (read_port, write_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
1692 #ifdef HAVE_SETLOCALE
1693
1694 SCM_DEFINE (scm_setlocale, "setlocale", 1, 1, 0,
1695             (SCM category, SCM locale),
1696             "If @var{locale} is omitted, return the current value of the\n"
1697             "specified locale category as a system-dependent string.\n"
1698             "@var{category} should be specified using the values\n"
1699             "@code{LC_COLLATE}, @code{LC_ALL} etc.\n"
1700             "\n"
1701             "Otherwise the specified locale category is set to the string\n"
1702             "@var{locale} and the new value is returned as a\n"
1703             "system-dependent string.  If @var{locale} is an empty string,\n"
1704             "the locale will be set using environment variables.\n"
1705             "\n"
1706             "When the locale is changed, the character encoding of the new\n"
1707             "locale (UTF-8, ISO-8859-1, etc.) is used for the current\n"
1708             "input, output, and error ports\n")
1709 #define FUNC_NAME s_scm_setlocale
1710 {
1711   int c_category;
1712   char *clocale;
1713   char *rv;
1714   const char *enc;
1715
1716   scm_dynwind_begin (0);
1717
1718   if (SCM_UNBNDP (locale))
1719     {
1720       clocale = NULL;
1721     }
1722   else
1723     {
1724       clocale = scm_to_locale_string (locale);
1725       scm_dynwind_free (clocale);
1726     }
1727
1728   c_category = scm_i_to_lc_category (category, 1);
1729
1730   scm_i_pthread_mutex_lock (&scm_i_locale_mutex);
1731   rv = setlocale (c_category, clocale);
1732   scm_i_pthread_mutex_unlock (&scm_i_locale_mutex);
1733
1734   if (rv == NULL)
1735     {
1736       /* POSIX and C99 don't say anything about setlocale setting errno, so
1737          force a sensible value here.  glibc leaves ENOENT, which would be
1738          fine, but it's not a documented feature.  */
1739       errno = EINVAL;
1740       SCM_SYSERROR;
1741     }
1742
1743   enc = locale_charset ();
1744
1745   /* Set the default encoding for new ports.  */
1746   scm_i_set_default_port_encoding (enc);
1747
1748   /* Set the encoding for the stdio ports.  */
1749   scm_i_set_port_encoding_x (scm_current_input_port (), enc);
1750   scm_i_set_port_encoding_x (scm_current_output_port (), enc);
1751   scm_i_set_port_encoding_x (scm_current_error_port (), enc);
1752
1753   scm_dynwind_end ();
1754   return scm_from_locale_string (rv);
1755 }
1756 #undef FUNC_NAME
1757 #endif /* HAVE_SETLOCALE */
1758
1759 #ifdef HAVE_MKNOD
1760 SCM_DEFINE (scm_mknod, "mknod", 4, 0, 0,
1761             (SCM path, SCM type, SCM perms, SCM dev),
1762             "Creates a new special file, such as a file corresponding to a device.\n"
1763             "@var{path} specifies the name of the file.  @var{type} should\n"
1764             "be one of the following symbols:\n"
1765             "regular, directory, symlink, block-special, char-special,\n"
1766             "fifo, or socket.  @var{perms} (an integer) specifies the file permissions.\n"
1767             "@var{dev} (an integer) specifies which device the special file refers\n"
1768             "to.  Its exact interpretation depends on the kind of special file\n"
1769             "being created.\n\n"
1770             "E.g.,\n"
1771             "@lisp\n"
1772             "(mknod \"/dev/fd0\" 'block-special #o660 (+ (* 2 256) 2))\n"
1773             "@end lisp\n\n"
1774             "The return value is unspecified.")
1775 #define FUNC_NAME s_scm_mknod
1776 {
1777   int val;
1778   const char *p;
1779   int ctype = 0;
1780
1781   SCM_VALIDATE_STRING (1, path);
1782   SCM_VALIDATE_SYMBOL (2, type);
1783
1784   p = scm_i_symbol_chars (type);
1785   if (strcmp (p, "regular") == 0)
1786     ctype = S_IFREG;
1787   else if (strcmp (p, "directory") == 0)
1788     ctype = S_IFDIR;
1789 #ifdef S_IFLNK
1790   /* systems without symlinks probably don't have S_IFLNK defined */
1791   else if (strcmp (p, "symlink") == 0)
1792     ctype = S_IFLNK;
1793 #endif
1794   else if (strcmp (p, "block-special") == 0)
1795     ctype = S_IFBLK;
1796   else if (strcmp (p, "char-special") == 0)
1797     ctype = S_IFCHR;
1798   else if (strcmp (p, "fifo") == 0)
1799     ctype = S_IFIFO;
1800 #ifdef S_IFSOCK
1801   else if (strcmp (p, "socket") == 0)
1802     ctype = S_IFSOCK;
1803 #endif
1804   else
1805     SCM_OUT_OF_RANGE (2, type);
1806
1807   STRING_SYSCALL (path, c_path,
1808                   val = mknod (c_path,
1809                                ctype | scm_to_int (perms),
1810                                scm_to_int (dev)));
1811   if (val != 0)
1812     SCM_SYSERROR;
1813   return SCM_UNSPECIFIED;
1814 }
1815 #undef FUNC_NAME
1816 #endif /* HAVE_MKNOD */
1817
1818 #ifdef HAVE_NICE
1819 SCM_DEFINE (scm_nice, "nice", 1, 0, 0,
1820             (SCM incr),
1821             "Increment the priority of the current process by @var{incr}.  A higher\n"
1822             "priority value means that the process runs less often.\n"
1823             "The return value is unspecified.")
1824 #define FUNC_NAME s_scm_nice
1825 {
1826   /* nice() returns "prio-NZERO" on success or -1 on error, but -1 can arise
1827      from "prio-NZERO", so an error must be detected from errno changed */
1828   errno = 0;
1829   nice (scm_to_int (incr));
1830   if (errno != 0)
1831     SCM_SYSERROR;
1832
1833   return SCM_UNSPECIFIED;
1834 }
1835 #undef FUNC_NAME
1836 #endif /* HAVE_NICE */
1837
1838 #ifdef HAVE_SYNC
1839 SCM_DEFINE (scm_sync, "sync", 0, 0, 0,
1840             (),
1841             "Flush the operating system disk buffers.\n"
1842             "The return value is unspecified.")
1843 #define FUNC_NAME s_scm_sync
1844 {
1845   sync();
1846   return SCM_UNSPECIFIED;
1847 }
1848 #undef FUNC_NAME
1849 #endif /* HAVE_SYNC */
1850
1851
1852 /* crypt() returns a pointer to a static buffer, so we use scm_i_misc_mutex
1853    to avoid another thread overwriting it.  A test program running crypt
1854    continuously in two threads can be quickly seen tripping this problem.
1855    crypt() is pretty slow normally, so a mutex shouldn't add much overhead.
1856
1857    glibc has a thread-safe crypt_r, but (in version 2.3.2) it runs a lot
1858    slower (about 5x) than plain crypt if you pass an uninitialized data
1859    block each time.  Presumably there's some one-time setups.  The best way
1860    to use crypt_r for parallel execution in multiple threads would probably
1861    be to maintain a little pool of initialized crypt_data structures, take
1862    one and use it, then return it to the pool.  That pool could be garbage
1863    collected so it didn't add permanently to memory use if only a few crypt
1864    calls are made.  But we expect crypt will be used rarely, and even more
1865    rarely will there be any desire for lots of parallel execution on
1866    multiple cpus.  So for now we don't bother with anything fancy, just
1867    ensure it works.  */
1868
1869 #ifdef HAVE_CRYPT
1870 SCM_DEFINE (scm_crypt, "crypt", 2, 0, 0,
1871             (SCM key, SCM salt),
1872             "Encrypt @var{key} using @var{salt} as the salt value to the\n"
1873             "crypt(3) library call.")
1874 #define FUNC_NAME s_scm_crypt
1875 {
1876   SCM ret;
1877   char *c_key, *c_salt, *c_ret;
1878
1879   scm_dynwind_begin (0);
1880   scm_i_dynwind_pthread_mutex_lock (&scm_i_misc_mutex);
1881
1882   c_key = scm_to_locale_string (key);
1883   scm_dynwind_free (c_key);
1884   c_salt = scm_to_locale_string (salt);
1885   scm_dynwind_free (c_salt);
1886
1887   /* The Linux crypt(3) man page says crypt will return NULL and set errno
1888      on error.  (Eg. ENOSYS if legal restrictions mean it cannot be
1889      implemented).  */
1890   c_ret = crypt (c_key, c_salt);
1891   if (c_ret == NULL)
1892     SCM_SYSERROR;
1893
1894   ret = scm_from_locale_string (c_ret);
1895   scm_dynwind_end ();
1896   return ret;
1897 }
1898 #undef FUNC_NAME
1899 #endif /* HAVE_CRYPT */
1900
1901 #if HAVE_CHROOT
1902 SCM_DEFINE (scm_chroot, "chroot", 1, 0, 0,
1903             (SCM path),
1904             "Change the root directory to that specified in @var{path}.\n"
1905             "This directory will be used for path names beginning with\n"
1906             "@file{/}.  The root directory is inherited by all children\n"
1907             "of the current process.  Only the superuser may change the\n"
1908             "root directory.")
1909 #define FUNC_NAME s_scm_chroot
1910 {
1911   int rv;
1912
1913   WITH_STRING (path, c_path,
1914                rv = chroot (c_path));
1915   if (rv == -1)
1916     SCM_SYSERROR;
1917   return SCM_UNSPECIFIED;
1918 }
1919 #undef FUNC_NAME
1920 #endif /* HAVE_CHROOT */
1921
1922
1923 #ifdef __MINGW32__
1924 /* Wrapper function to supplying `getlogin()' under Windows.  */
1925 static char * getlogin (void)
1926 {
1927   static char user[256];
1928   static unsigned long len = 256;
1929
1930   if (!GetUserName (user, &len))
1931     return NULL;
1932   return user;
1933 }
1934 #endif /* __MINGW32__ */
1935
1936
1937 #if defined (HAVE_GETLOGIN) || defined (__MINGW32__)
1938 SCM_DEFINE (scm_getlogin, "getlogin", 0, 0, 0,
1939             (void),
1940             "Return a string containing the name of the user logged in on\n"
1941             "the controlling terminal of the process, or @code{#f} if this\n"
1942             "information cannot be obtained.")
1943 #define FUNC_NAME s_scm_getlogin
1944 {
1945   char * p;
1946
1947   p = getlogin ();
1948   if (!p || !*p)
1949     return SCM_BOOL_F;
1950   return scm_from_locale_string (p);
1951 }
1952 #undef FUNC_NAME
1953 #endif /* HAVE_GETLOGIN */
1954
1955 #if HAVE_GETPRIORITY
1956 SCM_DEFINE (scm_getpriority, "getpriority", 2, 0, 0,
1957             (SCM which, SCM who),
1958             "Return the scheduling priority of the process, process group\n"
1959             "or user, as indicated by @var{which} and @var{who}. @var{which}\n"
1960             "is one of the variables @code{PRIO_PROCESS}, @code{PRIO_PGRP}\n"
1961             "or @code{PRIO_USER}, and @var{who} is interpreted relative to\n"
1962             "@var{which} (a process identifier for @code{PRIO_PROCESS},\n"
1963             "process group identifier for @code{PRIO_PGRP}, and a user\n"
1964             "identifier for @code{PRIO_USER}.  A zero value of @var{who}\n"
1965             "denotes the current process, process group, or user.  Return\n"
1966             "the highest priority (lowest numerical value) of any of the\n"
1967             "specified processes.")
1968 #define FUNC_NAME s_scm_getpriority
1969 {
1970   int cwhich, cwho, ret;
1971
1972   cwhich = scm_to_int (which);
1973   cwho = scm_to_int (who);
1974
1975   /* We have to clear errno and examine it later, because -1 is a
1976      legal return value for getpriority().  */
1977   errno = 0;
1978   ret = getpriority (cwhich, cwho);
1979   if (errno != 0)
1980     SCM_SYSERROR;
1981   return scm_from_int (ret);
1982 }
1983 #undef FUNC_NAME
1984 #endif /* HAVE_GETPRIORITY */
1985
1986 #if HAVE_SETPRIORITY
1987 SCM_DEFINE (scm_setpriority, "setpriority", 3, 0, 0,
1988             (SCM which, SCM who, SCM prio),
1989             "Set the scheduling priority of the process, process group\n"
1990             "or user, as indicated by @var{which} and @var{who}. @var{which}\n"
1991             "is one of the variables @code{PRIO_PROCESS}, @code{PRIO_PGRP}\n"
1992             "or @code{PRIO_USER}, and @var{who} is interpreted relative to\n"
1993             "@var{which} (a process identifier for @code{PRIO_PROCESS},\n"
1994             "process group identifier for @code{PRIO_PGRP}, and a user\n"
1995             "identifier for @code{PRIO_USER}.  A zero value of @var{who}\n"
1996             "denotes the current process, process group, or user.\n"
1997             "@var{prio} is a value in the range -20 and 20, the default\n"
1998             "priority is 0; lower priorities cause more favorable\n"
1999             "scheduling.  Sets the priority of all of the specified\n"
2000             "processes.  Only the super-user may lower priorities.\n"
2001             "The return value is not specified.")
2002 #define FUNC_NAME s_scm_setpriority
2003 {
2004   int cwhich, cwho, cprio;
2005
2006   cwhich = scm_to_int (which);
2007   cwho = scm_to_int (who);
2008   cprio = scm_to_int (prio);
2009
2010   if (setpriority (cwhich, cwho, cprio) == -1)
2011     SCM_SYSERROR;
2012   return SCM_UNSPECIFIED;
2013 }
2014 #undef FUNC_NAME
2015 #endif /* HAVE_SETPRIORITY */
2016
2017 #ifdef HAVE_SCHED_GETAFFINITY
2018
2019 static SCM
2020 cpu_set_to_bitvector (const cpu_set_t *cs)
2021 {
2022   SCM bv;
2023   size_t cpu;
2024
2025   bv = scm_c_make_bitvector (sizeof (*cs), SCM_BOOL_F);
2026
2027   for (cpu = 0; cpu < sizeof (*cs); cpu++)
2028     {
2029       if (CPU_ISSET (cpu, cs))
2030         /* XXX: This is inefficient but avoids code duplication.  */
2031         scm_c_bitvector_set_x (bv, cpu, SCM_BOOL_T);
2032     }
2033
2034   return bv;
2035 }
2036
2037 SCM_DEFINE (scm_getaffinity, "getaffinity", 1, 0, 0,
2038             (SCM pid),
2039             "Return a bitvector representing the CPU affinity mask for\n"
2040             "process @var{pid}.  Each CPU the process has affinity with\n"
2041             "has its corresponding bit set in the returned bitvector.\n"
2042             "The number of bits set is a good estimate of how many CPUs\n"
2043             "Guile can use without stepping on other processes' toes.\n\n"
2044             "Currently this procedure is only defined on GNU variants\n"
2045             "(@pxref{CPU Affinity, @code{sched_getaffinity},, libc, The\n"
2046             "GNU C Library Reference Manual}).\n")
2047 #define FUNC_NAME s_scm_getaffinity
2048 {
2049   int err;
2050   cpu_set_t cs;
2051
2052   CPU_ZERO (&cs);
2053   err = sched_getaffinity (scm_to_int (pid), sizeof (cs), &cs);
2054   if (err)
2055     SCM_SYSERROR;
2056
2057   return cpu_set_to_bitvector (&cs);
2058 }
2059 #undef FUNC_NAME
2060
2061 #endif /* HAVE_SCHED_GETAFFINITY */
2062
2063 #ifdef HAVE_SCHED_SETAFFINITY
2064
2065 SCM_DEFINE (scm_setaffinity, "setaffinity", 2, 0, 0,
2066             (SCM pid, SCM mask),
2067             "Install the CPU affinity mask @var{mask}, a bitvector, for\n"
2068             "the process or thread with ID @var{pid}.  The return value\n"
2069             "is unspecified.\n\n"
2070             "Currently this procedure is only defined on GNU variants\n"
2071             "(@pxref{CPU Affinity, @code{sched_setaffinity},, libc, The\n"
2072             "GNU C Library Reference Manual}).\n")
2073 #define FUNC_NAME s_scm_setaffinity
2074 {
2075   cpu_set_t cs;
2076   scm_t_array_handle handle;
2077   const scm_t_uint32 *c_mask;
2078   size_t len, off, cpu;
2079   ssize_t inc;
2080   int err;
2081
2082   c_mask = scm_bitvector_elements (mask, &handle, &off, &len, &inc);
2083
2084   CPU_ZERO (&cs);
2085   for (cpu = 0; cpu < len; cpu++)
2086     {
2087       size_t idx;
2088
2089       idx = cpu * inc + off;
2090       if (c_mask[idx / 32] & (1UL << (idx % 32)))
2091         CPU_SET (cpu, &cs);
2092     }
2093
2094   err = sched_setaffinity (scm_to_int (pid), sizeof (cs), &cs);
2095   if (err)
2096     SCM_SYSERROR;
2097
2098   return SCM_UNSPECIFIED;
2099 }
2100 #undef FUNC_NAME
2101
2102 #endif /* HAVE_SCHED_SETAFFINITY */
2103
2104 \f
2105 #if HAVE_GETPASS
2106 SCM_DEFINE (scm_getpass, "getpass", 1, 0, 0,
2107             (SCM prompt),
2108             "Display @var{prompt} to the standard error output and read\n"
2109             "a password from @file{/dev/tty}.  If this file is not\n"
2110             "accessible, it reads from standard input.  The password may be\n"
2111             "up to 127 characters in length.  Additional characters and the\n"
2112             "terminating newline character are discarded.  While reading\n"
2113             "the password, echoing and the generation of signals by special\n"
2114             "characters is disabled.")
2115 #define FUNC_NAME s_scm_getpass
2116 {
2117   char * p;
2118   SCM passwd;
2119
2120   SCM_VALIDATE_STRING (1, prompt);
2121
2122   WITH_STRING (prompt, c_prompt,
2123                p = getpass(c_prompt));
2124   passwd = scm_from_locale_string (p);
2125
2126   /* Clear out the password in the static buffer.  */
2127   memset (p, 0, strlen (p));
2128
2129   return passwd;
2130 }
2131 #undef FUNC_NAME
2132 #endif /* HAVE_GETPASS */
2133
2134 SCM_DEFINE (scm_flock, "flock", 2, 0, 0,
2135             (SCM file, SCM operation),
2136             "Apply or remove an advisory lock on an open file.\n"
2137             "@var{operation} specifies the action to be done:\n"
2138             "\n"
2139             "@defvar LOCK_SH\n"
2140             "Shared lock.  More than one process may hold a shared lock\n"
2141             "for a given file at a given time.\n"
2142             "@end defvar\n"
2143             "@defvar LOCK_EX\n"
2144             "Exclusive lock.  Only one process may hold an exclusive lock\n"
2145             "for a given file at a given time.\n"
2146             "@end defvar\n"
2147             "@defvar LOCK_UN\n"
2148             "Unlock the file.\n"
2149             "@end defvar\n"
2150             "@defvar LOCK_NB\n"
2151             "Don't block when locking.  This is combined with one of the\n"
2152             "other operations using @code{logior}.  If @code{flock} would\n"
2153             "block an @code{EWOULDBLOCK} error is thrown.\n"
2154             "@end defvar\n"
2155             "\n"
2156             "The return value is not specified. @var{file} may be an open\n"
2157             "file descriptor or an open file descriptor port.\n"
2158             "\n"
2159             "Note that @code{flock} does not lock files across NFS.")
2160 #define FUNC_NAME s_scm_flock
2161 {
2162   int fdes;
2163
2164   if (scm_is_integer (file))
2165     fdes = scm_to_int (file);
2166   else
2167     {
2168       SCM_VALIDATE_OPFPORT (2, file);
2169
2170       fdes = SCM_FPORT_FDES (file);
2171     }
2172   if (flock (fdes, scm_to_int (operation)) == -1)
2173     SCM_SYSERROR;
2174   return SCM_UNSPECIFIED;
2175 }
2176 #undef FUNC_NAME
2177
2178 #if HAVE_SETHOSTNAME
2179 SCM_DEFINE (scm_sethostname, "sethostname", 1, 0, 0,
2180             (SCM name),
2181             "Set the host name of the current processor to @var{name}. May\n"
2182             "only be used by the superuser.  The return value is not\n"
2183             "specified.")
2184 #define FUNC_NAME s_scm_sethostname
2185 {
2186   int rv;
2187
2188   WITH_STRING (name, c_name,
2189                rv = sethostname (c_name, strlen(c_name)));
2190   if (rv == -1)
2191     SCM_SYSERROR;
2192   return SCM_UNSPECIFIED;
2193 }
2194 #undef FUNC_NAME
2195 #endif /* HAVE_SETHOSTNAME */
2196
2197
2198 #if HAVE_GETHOSTNAME
2199 SCM_DEFINE (scm_gethostname, "gethostname", 0, 0, 0,
2200             (void),
2201             "Return the host name of the current processor.")
2202 #define FUNC_NAME s_scm_gethostname
2203 {
2204 #ifdef MAXHOSTNAMELEN
2205
2206   /* Various systems define MAXHOSTNAMELEN (including Solaris in fact).
2207    * On GNU/Linux this doesn't include the terminating '\0', hence "+ 1".  */
2208   const int len = MAXHOSTNAMELEN + 1;
2209   char *const p = scm_malloc (len);
2210   const int res = gethostname (p, len);
2211
2212   scm_dynwind_begin (0);
2213   scm_dynwind_unwind_handler (free, p, 0);
2214
2215 #else
2216
2217   /* Default 256 is for Solaris, under Linux ENAMETOOLONG is returned if not
2218    * large enough.  SUSv2 specifies 255 maximum too, apparently.  */
2219   int len = 256;
2220   int res;
2221   char *p;
2222
2223 #  if HAVE_SYSCONF && defined (_SC_HOST_NAME_MAX)
2224
2225   /* POSIX specifies the HOST_NAME_MAX system parameter for the max size,
2226    * which may reflect a particular kernel configuration.
2227    * Must watch out for this existing but giving -1, as happens for instance
2228    * in gnu/linux glibc 2.3.2.  */
2229   {
2230     const long int n = sysconf (_SC_HOST_NAME_MAX);
2231     if (n != -1L)
2232       len = n;
2233   }
2234
2235 #  endif
2236
2237   p = scm_malloc (len);
2238
2239   scm_dynwind_begin (0);
2240   scm_dynwind_unwind_handler (free, p, 0);
2241
2242   res = gethostname (p, len);
2243   while (res == -1 && errno == ENAMETOOLONG)
2244     {
2245       len *= 2;
2246
2247       /* scm_realloc may throw an exception.  */
2248       p = scm_realloc (p, len);
2249       res = gethostname (p, len);
2250     }
2251
2252 #endif
2253
2254   if (res == -1)
2255     {
2256       const int save_errno = errno;
2257
2258       /* No guile exceptions can occur before we have freed p's memory. */
2259       scm_dynwind_end ();
2260       free (p);
2261
2262       errno = save_errno;
2263       SCM_SYSERROR;
2264     }
2265   else
2266     {
2267       /* scm_from_locale_string may throw an exception.  */
2268       const SCM name = scm_from_locale_string (p);
2269
2270       /* No guile exceptions can occur before we have freed p's memory. */
2271       scm_dynwind_end ();
2272       free (p);
2273
2274       return name;
2275     }
2276 }
2277 #undef FUNC_NAME
2278 #endif /* HAVE_GETHOSTNAME */
2279
2280 \f
2281 #ifdef HAVE_FORK
2282 static void
2283 scm_init_popen (void)
2284 {
2285   scm_c_define_gsubr ("open-process", 2, 0, 1, scm_open_process);
2286 }
2287 #endif
2288
2289 void
2290 scm_init_posix ()
2291 {
2292   scm_add_feature ("posix");
2293 #ifdef HAVE_GETEUID
2294   scm_add_feature ("EIDs");
2295 #endif
2296 #ifdef WAIT_ANY
2297   scm_c_define ("WAIT_ANY", scm_from_int (WAIT_ANY));
2298 #endif
2299 #ifdef WAIT_MYPGRP
2300   scm_c_define ("WAIT_MYPGRP", scm_from_int (WAIT_MYPGRP));
2301 #endif
2302 #ifdef WNOHANG
2303   scm_c_define ("WNOHANG", scm_from_int (WNOHANG));
2304 #endif
2305 #ifdef WUNTRACED
2306   scm_c_define ("WUNTRACED", scm_from_int (WUNTRACED));
2307 #endif
2308
2309 #ifdef LC_COLLATE
2310   scm_c_define ("LC_COLLATE", scm_from_int (LC_COLLATE));
2311 #endif
2312 #ifdef LC_CTYPE
2313   scm_c_define ("LC_CTYPE", scm_from_int (LC_CTYPE));
2314 #endif
2315 #ifdef LC_MONETARY
2316   scm_c_define ("LC_MONETARY", scm_from_int (LC_MONETARY));
2317 #endif
2318 #ifdef LC_NUMERIC
2319   scm_c_define ("LC_NUMERIC", scm_from_int (LC_NUMERIC));
2320 #endif
2321 #ifdef LC_TIME
2322   scm_c_define ("LC_TIME", scm_from_int (LC_TIME));
2323 #endif
2324 #ifdef LC_MESSAGES
2325   scm_c_define ("LC_MESSAGES", scm_from_int (LC_MESSAGES));
2326 #endif
2327 #ifdef LC_ALL
2328   scm_c_define ("LC_ALL", scm_from_int (LC_ALL));
2329 #endif
2330 #ifdef LC_PAPER
2331   scm_c_define ("LC_PAPER", scm_from_int (LC_PAPER));
2332 #endif
2333 #ifdef LC_NAME
2334   scm_c_define ("LC_NAME", scm_from_int (LC_NAME));
2335 #endif
2336 #ifdef LC_ADDRESS
2337   scm_c_define ("LC_ADDRESS", scm_from_int (LC_ADDRESS));
2338 #endif
2339 #ifdef LC_TELEPHONE
2340   scm_c_define ("LC_TELEPHONE", scm_from_int (LC_TELEPHONE));
2341 #endif
2342 #ifdef LC_MEASUREMENT
2343   scm_c_define ("LC_MEASUREMENT", scm_from_int (LC_MEASUREMENT));
2344 #endif
2345 #ifdef LC_IDENTIFICATION
2346   scm_c_define ("LC_IDENTIFICATION", scm_from_int (LC_IDENTIFICATION));
2347 #endif
2348 #ifdef PIPE_BUF
2349   scm_c_define ("PIPE_BUF", scm_from_long (PIPE_BUF));
2350 #endif
2351
2352 #ifdef PRIO_PROCESS
2353   scm_c_define ("PRIO_PROCESS", scm_from_int (PRIO_PROCESS));
2354 #endif
2355 #ifdef PRIO_PGRP
2356   scm_c_define ("PRIO_PGRP", scm_from_int (PRIO_PGRP));
2357 #endif
2358 #ifdef PRIO_USER
2359   scm_c_define ("PRIO_USER", scm_from_int (PRIO_USER));
2360 #endif
2361
2362 #ifdef LOCK_SH
2363   scm_c_define ("LOCK_SH", scm_from_int (LOCK_SH));
2364 #endif
2365 #ifdef LOCK_EX
2366   scm_c_define ("LOCK_EX", scm_from_int (LOCK_EX));
2367 #endif
2368 #ifdef LOCK_UN
2369   scm_c_define ("LOCK_UN", scm_from_int (LOCK_UN));
2370 #endif
2371 #ifdef LOCK_NB
2372   scm_c_define ("LOCK_NB", scm_from_int (LOCK_NB));
2373 #endif
2374
2375 #include "libguile/cpp-SIG.c"
2376 #include "libguile/posix.x"
2377
2378 #ifdef HAVE_FORK
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 #endif  /* HAVE_FORK */
2384 }
2385
2386 /*
2387   Local Variables:
2388   c-file-style: "gnu"
2389   End:
2390 */