lib/unistd.in.h

   1 /* Substitute for and wrapper around <unistd.h>.
   2    Copyright (C) 2003-2009 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #ifndef _GL_UNISTD_H
  19
  20 #if __GNUC__ >= 3
  21 @PRAGMA_SYSTEM_HEADER@
  22 #endif
  23
  24 /* The include_next requires a split double-inclusion guard.  */
  25 #if @HAVE_UNISTD_H@
  26 # @INCLUDE_NEXT@ @NEXT_UNISTD_H@
  27 #endif
  28
  29 #ifndef _GL_UNISTD_H
  30 #define _GL_UNISTD_H
  31
  32 /* NetBSD 5.0 mis-defines NULL.  Also get size_t.  */
  33 #include <stddef.h>
  34
  35 /* mingw doesn't define the SEEK_* or *_FILENO macros in <unistd.h>.  */
  36 #if !(defined SEEK_CUR && defined SEEK_END && defined SEEK_SET)
  37 # include <stdio.h>
  38 #endif
  39
  40 /* mingw fails to declare _exit in <unistd.h>.  */
  41 /* mingw, BeOS, Haiku declare environ in <stdlib.h>, not in <unistd.h>.  */
  42 #include <stdlib.h>
  43
  44 #if ((@GNULIB_WRITE@ && @REPLACE_WRITE@ && @GNULIB_UNISTD_H_SIGPIPE@)   \
  45      || (@GNULIB_READLINK@ && (!@HAVE_READLINK@ || @REPLACE_READLINK@)) \
  46      || (@GNULIB_READLINKAT@ && !@HAVE_READLINKAT@))
  47 /* Get ssize_t.  */
  48 # include <sys/types.h>
  49 #endif
  50
  51 /* Get getopt(), optarg, optind, opterr, optopt.  */
  52 #if @GNULIB_UNISTD_H_GETOPT@ && !defined _GL_SYSTEM_GETOPT
  53 # include <getopt.h>
  54 #endif
  55
  56 #if @GNULIB_GETHOSTNAME@
  57 /* Get all possible declarations of gethostname().  */
  58 # if @UNISTD_H_HAVE_WINSOCK2_H@
  59 #  include <winsock2.h>
  60 #  if !defined _GL_SYS_SOCKET_H
  61 #   undef socket
  62 #   define socket               socket_used_without_including_sys_socket_h
  63 #   undef connect
  64 #   define connect              connect_used_without_including_sys_socket_h
  65 #   undef accept
  66 #   define accept               accept_used_without_including_sys_socket_h
  67 #   undef bind
  68 #   define bind                 bind_used_without_including_sys_socket_h
  69 #   undef getpeername
  70 #   define getpeername          getpeername_used_without_including_sys_socket_h
  71 #   undef getsockname
  72 #   define getsockname          getsockname_used_without_including_sys_socket_h
  73 #   undef getsockopt
  74 #   define getsockopt           getsockopt_used_without_including_sys_socket_h
  75 #   undef listen
  76 #   define listen               listen_used_without_including_sys_socket_h
  77 #   undef recv
  78 #   define recv                 recv_used_without_including_sys_socket_h
  79 #   undef send
  80 #   define send                 send_used_without_including_sys_socket_h
  81 #   undef recvfrom
  82 #   define recvfrom             recvfrom_used_without_including_sys_socket_h
  83 #   undef sendto
  84 #   define sendto               sendto_used_without_including_sys_socket_h
  85 #   undef setsockopt
  86 #   define setsockopt           setsockopt_used_without_including_sys_socket_h
  87 #   undef shutdown
  88 #   define shutdown             shutdown_used_without_including_sys_socket_h
  89 #  endif
  90 #  if !defined _GL_SYS_SELECT_H
  91 #   undef select
  92 #   define select               select_used_without_including_sys_select_h
  93 #  endif
  94 # endif
  95 #endif
  96
  97 /* The definition of GL_LINK_WARNING is copied here.  */
  98
  99
 100 /* OS/2 EMX lacks these macros.  */
 101 #ifndef STDIN_FILENO
 102 # define STDIN_FILENO 0
 103 #endif
 104 #ifndef STDOUT_FILENO
 105 # define STDOUT_FILENO 1
 106 #endif
 107 #ifndef STDERR_FILENO
 108 # define STDERR_FILENO 2
 109 #endif
 110
 111 /* Ensure *_OK macros exist.  */
 112 #ifndef F_OK
 113 # define F_OK 0
 114 # define X_OK 1
 115 # define W_OK 2
 116 # define R_OK 4
 117 #endif
 118
 119
 120 /* Declare overridden functions.  */
 121
 122 #ifdef __cplusplus
 123 extern "C" {
 124 #endif
 125
 126
 127 #if @GNULIB_CHOWN@
 128 # if @REPLACE_CHOWN@
 129 #  ifndef REPLACE_CHOWN
 130 #   define REPLACE_CHOWN 1
 131 #  endif
 132 #  if REPLACE_CHOWN
 133 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
 134    to GID (if GID is not -1).  Follow symbolic links.
 135    Return 0 if successful, otherwise -1 and errno set.
 136    See the POSIX:2001 specification
 137    <http://www.opengroup.org/susv3xsh/chown.html>.  */
 138 #   define chown rpl_chown
 139 extern int chown (const char *file, uid_t uid, gid_t gid);
 140 #  endif
 141 # endif
 142 #elif defined GNULIB_POSIXCHECK
 143 # undef chown
 144 # define chown(f,u,g) \
 145     (GL_LINK_WARNING ("chown fails to follow symlinks on some systems and " \
 146                       "doesn't treat a uid or gid of -1 on some systems - " \
 147                       "use gnulib module chown for portability"), \
 148      chown (f, u, g))
 149 #endif
 150
 151
 152 #if @GNULIB_CLOSE@
 153 # if @REPLACE_CLOSE@
 154 /* Automatically included by modules that need a replacement for close.  */
 155 #  undef close
 156 #  define close rpl_close
 157 extern int close (int);
 158 # endif
 159 #elif @UNISTD_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS@
 160 # undef close
 161 # define close close_used_without_requesting_gnulib_module_close
 162 #elif defined GNULIB_POSIXCHECK
 163 # undef close
 164 # define close(f) \
 165     (GL_LINK_WARNING ("close does not portably work on sockets - " \
 166                       "use gnulib module close for portability"), \
 167      close (f))
 168 #endif
 169
 170
 171 #if @REPLACE_DUP@
 172 # define dup rpl_dup
 173 extern int dup (int);
 174 #endif
 175
 176
 177 #if @GNULIB_DUP2@
 178 # if @REPLACE_DUP2@
 179 #  define dup2 rpl_dup2
 180 # endif
 181 # if !@HAVE_DUP2@ || @REPLACE_DUP2@
 182 /* Copy the file descriptor OLDFD into file descriptor NEWFD.  Do nothing if
 183    NEWFD = OLDFD, otherwise close NEWFD first if it is open.
 184    Return newfd if successful, otherwise -1 and errno set.
 185    See the POSIX:2001 specification
 186    <http://www.opengroup.org/susv3xsh/dup2.html>.  */
 187 extern int dup2 (int oldfd, int newfd);
 188 # endif
 189 #elif defined GNULIB_POSIXCHECK
 190 # undef dup2
 191 # define dup2(o,n) \
 192     (GL_LINK_WARNING ("dup2 is unportable - " \
 193                       "use gnulib module dup2 for portability"), \
 194      dup2 (o, n))
 195 #endif
 196
 197
 198 #if @GNULIB_DUP3@
 199 /* Copy the file descriptor OLDFD into file descriptor NEWFD, with the
 200    specified flags.
 201    The flags are a bitmask, possibly including O_CLOEXEC (defined in <fcntl.h>)
 202    and O_TEXT, O_BINARY (defined in "binary-io.h").
 203    Close NEWFD first if it is open.
 204    Return newfd if successful, otherwise -1 and errno set.
 205    See the Linux man page at
 206    <http://www.kernel.org/doc/man-pages/online/pages/man2/dup3.2.html>.  */
 207 # if @HAVE_DUP3@
 208 #  define dup3 rpl_dup3
 209 # endif
 210 extern int dup3 (int oldfd, int newfd, int flags);
 211 #elif defined GNULIB_POSIXCHECK
 212 # undef dup3
 213 # define dup3(o,n,f) \
 214     (GL_LINK_WARNING ("dup3 is unportable - " \
 215                       "use gnulib module dup3 for portability"), \
 216      dup3 (o, n, f))
 217 #endif
 218
 219
 220 #if @GNULIB_ENVIRON@
 221 # if !@HAVE_DECL_ENVIRON@
 222 /* Set of environment variables and values.  An array of strings of the form
 223    "VARIABLE=VALUE", terminated with a NULL.  */
 224 #  if defined __APPLE__ && defined __MACH__
 225 #   include <crt_externs.h>
 226 #   define environ (*_NSGetEnviron ())
 227 #  else
 228 extern char **environ;
 229 #  endif
 230 # endif
 231 #elif defined GNULIB_POSIXCHECK
 232 # undef environ
 233 # define environ \
 234     (GL_LINK_WARNING ("environ is unportable - " \
 235                       "use gnulib module environ for portability"), \
 236      environ)
 237 #endif
 238
 239
 240 #if @GNULIB_EUIDACCESS@
 241 # if !@HAVE_EUIDACCESS@
 242 /* Like access(), except that it uses the effective user id and group id of
 243    the current process.  */
 244 extern int euidaccess (const char *filename, int mode);
 245 # endif
 246 #elif defined GNULIB_POSIXCHECK
 247 # undef euidaccess
 248 # define euidaccess(f,m) \
 249     (GL_LINK_WARNING ("euidaccess is unportable - " \
 250                       "use gnulib module euidaccess for portability"), \
 251      euidaccess (f, m))
 252 #endif
 253
 254
 255 #if @GNULIB_FACCESSAT@
 256 # if !@HAVE_FACCESSAT@
 257 int faccessat (int fd, char const *file, int mode, int flag);
 258 # endif
 259 #elif defined GNULIB_POSIXCHECK
 260 # undef faccessat
 261 # define faccessat(d,n,m,f)                         \
 262     (GL_LINK_WARNING ("faccessat is not portable - " \
 263                       "use gnulib module faccessat for portability"), \
 264      faccessat (d, n, m, f))
 265 #endif
 266
 267
 268 #if @GNULIB_FCHDIR@
 269 # if @REPLACE_FCHDIR@
 270 /* Change the process' current working directory to the directory on which
 271    the given file descriptor is open.
 272    Return 0 if successful, otherwise -1 and errno set.
 273    See the POSIX:2001 specification
 274    <http://www.opengroup.org/susv3xsh/fchdir.html>.  */
 275 extern int fchdir (int /*fd*/);
 276
 277 /* Gnulib internal hooks needed to maintain the fchdir metadata.  */
 278 extern int _gl_register_fd (int fd, const char *filename);
 279 extern void _gl_unregister_fd (int fd);
 280 extern int _gl_register_dup (int oldfd, int newfd);
 281 extern const char *_gl_directory_name (int fd);
 282
 283 # endif
 284 #elif defined GNULIB_POSIXCHECK
 285 # undef fchdir
 286 # define fchdir(f) \
 287     (GL_LINK_WARNING ("fchdir is unportable - " \
 288                       "use gnulib module fchdir for portability"), \
 289      fchdir (f))
 290 #endif
 291
 292
 293 #if @GNULIB_FCHOWNAT@
 294 # if @REPLACE_FCHOWNAT@
 295 #  undef fchownat
 296 #  define fchownat rpl_fchownat
 297 # endif
 298 # if !@HAVE_FCHOWNAT@ || @REPLACE_FCHOWNAT@
 299 extern int fchownat (int fd, char const *file, uid_t owner, gid_t group, int flag);
 300 # endif
 301 #elif defined GNULIB_POSIXCHECK
 302 # undef fchownat
 303 # define fchownat(d,n,o,g,f)                        \
 304     (GL_LINK_WARNING ("fchownat is not portable - " \
 305                       "use gnulib module openat for portability"), \
 306      fchownat (d, n, o, g, f))
 307 #endif
 308
 309
 310 #if @GNULIB_FSYNC@
 311 /* Synchronize changes to a file.
 312    Return 0 if successful, otherwise -1 and errno set.
 313    See POSIX:2001 specification
 314    <http://www.opengroup.org/susv3xsh/fsync.html>.  */
 315 # if !@HAVE_FSYNC@
 316 extern int fsync (int fd);
 317 # endif
 318 #elif defined GNULIB_POSIXCHECK
 319 # undef fsync
 320 # define fsync(fd) \
 321     (GL_LINK_WARNING ("fsync is unportable - " \
 322                       "use gnulib module fsync for portability"), \
 323      fsync (fd))
 324 #endif
 325
 326
 327 #if @GNULIB_FTRUNCATE@
 328 # if !@HAVE_FTRUNCATE@
 329 /* Change the size of the file to which FD is opened to become equal to LENGTH.
 330    Return 0 if successful, otherwise -1 and errno set.
 331    See the POSIX:2001 specification
 332    <http://www.opengroup.org/susv3xsh/ftruncate.html>.  */
 333 extern int ftruncate (int fd, off_t length);
 334 # endif
 335 #elif defined GNULIB_POSIXCHECK
 336 # undef ftruncate
 337 # define ftruncate(f,l) \
 338     (GL_LINK_WARNING ("ftruncate is unportable - " \
 339                       "use gnulib module ftruncate for portability"), \
 340      ftruncate (f, l))
 341 #endif
 342
 343
 344 #if @GNULIB_GETCWD@
 345 /* Include the headers that might declare getcwd so that they will not
 346    cause confusion if included after this file.  */
 347 # include <stdlib.h>
 348 # if @REPLACE_GETCWD@
 349 /* Get the name of the current working directory, and put it in SIZE bytes
 350    of BUF.
 351    Return BUF if successful, or NULL if the directory couldn't be determined
 352    or SIZE was too small.
 353    See the POSIX:2001 specification
 354    <http://www.opengroup.org/susv3xsh/getcwd.html>.
 355    Additionally, the gnulib module 'getcwd' guarantees the following GNU
 356    extension: If BUF is NULL, an array is allocated with 'malloc'; the array
 357    is SIZE bytes long, unless SIZE == 0, in which case it is as big as
 358    necessary.  */
 359 #  define getcwd rpl_getcwd
 360 extern char * getcwd (char *buf, size_t size);
 361 # endif
 362 #elif defined GNULIB_POSIXCHECK
 363 # undef getcwd
 364 # define getcwd(b,s) \
 365     (GL_LINK_WARNING ("getcwd is unportable - " \
 366                       "use gnulib module getcwd for portability"), \
 367      getcwd (b, s))
 368 #endif
 369
 370
 371 #if @GNULIB_GETDOMAINNAME@
 372 /* Return the NIS domain name of the machine.
 373    WARNING! The NIS domain name is unrelated to the fully qualified host name
 374             of the machine.  It is also unrelated to email addresses.
 375    WARNING! The NIS domain name is usually the empty string or "(none)" when
 376             not using NIS.
 377
 378    Put up to LEN bytes of the NIS domain name into NAME.
 379    Null terminate it if the name is shorter than LEN.
 380    If the NIS domain name is longer than LEN, set errno = EINVAL and return -1.
 381    Return 0 if successful, otherwise set errno and return -1.  */
 382 # if !@HAVE_GETDOMAINNAME@
 383 extern int getdomainname(char *name, size_t len);
 384 # endif
 385 #elif defined GNULIB_POSIXCHECK
 386 # undef getdomainname
 387 # define getdomainname(n,l) \
 388     (GL_LINK_WARNING ("getdomainname is unportable - " \
 389                       "use gnulib module getdomainname for portability"), \
 390      getdomainname (n, l))
 391 #endif
 392
 393
 394 #if @GNULIB_GETDTABLESIZE@
 395 # if !@HAVE_GETDTABLESIZE@
 396 /* Return the maximum number of file descriptors in the current process.
 397    In POSIX, this is same as sysconf (_SC_OPEN_MAX).  */
 398 extern int getdtablesize (void);
 399 # endif
 400 #elif defined GNULIB_POSIXCHECK
 401 # undef getdtablesize
 402 # define getdtablesize() \
 403     (GL_LINK_WARNING ("getdtablesize is unportable - " \
 404                       "use gnulib module getdtablesize for portability"), \
 405      getdtablesize ())
 406 #endif
 407
 408
 409 #if @GNULIB_GETHOSTNAME@
 410 /* Return the standard host name of the machine.
 411    WARNING! The host name may or may not be fully qualified.
 412
 413    Put up to LEN bytes of the host name into NAME.
 414    Null terminate it if the name is shorter than LEN.
 415    If the host name is longer than LEN, set errno = EINVAL and return -1.
 416    Return 0 if successful, otherwise set errno and return -1.  */
 417 # if @UNISTD_H_HAVE_WINSOCK2_H@
 418 #  undef gethostname
 419 #  define gethostname rpl_gethostname
 420 # endif
 421 # if @UNISTD_H_HAVE_WINSOCK2_H@ || !@HAVE_GETHOSTNAME@
 422 extern int gethostname(char *name, size_t len);
 423 # endif
 424 #elif @UNISTD_H_HAVE_WINSOCK2_H@
 425 # undef gethostname
 426 # define gethostname gethostname_used_without_requesting_gnulib_module_gethostname
 427 #elif defined GNULIB_POSIXCHECK
 428 # undef gethostname
 429 # define gethostname(n,l) \
 430     (GL_LINK_WARNING ("gethostname is unportable - " \
 431                       "use gnulib module gethostname for portability"), \
 432      gethostname (n, l))
 433 #endif
 434
 435
 436 #if @GNULIB_GETLOGIN_R@
 437 /* Copies the user's login name to NAME.
 438    The array pointed to by NAME has room for SIZE bytes.
 439
 440    Returns 0 if successful.  Upon error, an error number is returned, or -1 in
 441    the case that the login name cannot be found but no specific error is
 442    provided (this case is hopefully rare but is left open by the POSIX spec).
 443
 444    See <http://www.opengroup.org/susv3xsh/getlogin.html>.
 445  */
 446 # if !@HAVE_DECL_GETLOGIN_R@
 447 extern int getlogin_r (char *name, size_t size);
 448 # endif
 449 #elif defined GNULIB_POSIXCHECK
 450 # undef getlogin_r
 451 # define getlogin_r(n,s) \
 452     (GL_LINK_WARNING ("getlogin_r is unportable - " \
 453                       "use gnulib module getlogin_r for portability"), \
 454      getlogin_r (n, s))
 455 #endif
 456
 457
 458 #if @GNULIB_GETPAGESIZE@
 459 # if @REPLACE_GETPAGESIZE@
 460 #  define getpagesize rpl_getpagesize
 461 extern int getpagesize (void);
 462 # elif !@HAVE_GETPAGESIZE@
 463 /* This is for POSIX systems.  */
 464 #  if !defined getpagesize && defined _SC_PAGESIZE
 465 #   if ! (defined __VMS && __VMS_VER < 70000000)
 466 #    define getpagesize() sysconf (_SC_PAGESIZE)
 467 #   endif
 468 #  endif
 469 /* This is for older VMS.  */
 470 #  if !defined getpagesize && defined __VMS
 471 #   ifdef __ALPHA
 472 #    define getpagesize() 8192
 473 #   else
 474 #    define getpagesize() 512
 475 #   endif
 476 #  endif
 477 /* This is for BeOS.  */
 478 #  if !defined getpagesize && @HAVE_OS_H@
 479 #   include <OS.h>
 480 #   if defined B_PAGE_SIZE
 481 #    define getpagesize() B_PAGE_SIZE
 482 #   endif
 483 #  endif
 484 /* This is for AmigaOS4.0.  */
 485 #  if !defined getpagesize && defined __amigaos4__
 486 #   define getpagesize() 2048
 487 #  endif
 488 /* This is for older Unix systems.  */
 489 #  if !defined getpagesize && @HAVE_SYS_PARAM_H@
 490 #   include <sys/param.h>
 491 #   ifdef EXEC_PAGESIZE
 492 #    define getpagesize() EXEC_PAGESIZE
 493 #   else
 494 #    ifdef NBPG
 495 #     ifndef CLSIZE
 496 #      define CLSIZE 1
 497 #     endif
 498 #     define getpagesize() (NBPG * CLSIZE)
 499 #    else
 500 #     ifdef NBPC
 501 #      define getpagesize() NBPC
 502 #     endif
 503 #    endif
 504 #   endif
 505 #  endif
 506 # endif
 507 #elif defined GNULIB_POSIXCHECK
 508 # undef getpagesize
 509 # define getpagesize() \
 510     (GL_LINK_WARNING ("getpagesize is unportable - " \
 511                       "use gnulib module getpagesize for portability"), \
 512      getpagesize ())
 513 #endif
 514
 515
 516 #if @GNULIB_GETUSERSHELL@
 517 # if !@HAVE_GETUSERSHELL@
 518 /* Return the next valid login shell on the system, or NULL when the end of
 519    the list has been reached.  */
 520 extern char *getusershell (void);
 521 /* Rewind to pointer that is advanced at each getusershell() call.  */
 522 extern void setusershell (void);
 523 /* Free the pointer that is advanced at each getusershell() call and
 524    associated resources.  */
 525 extern void endusershell (void);
 526 # endif
 527 #elif defined GNULIB_POSIXCHECK
 528 # undef getusershell
 529 # define getusershell() \
 530     (GL_LINK_WARNING ("getusershell is unportable - " \
 531                       "use gnulib module getusershell for portability"), \
 532      getusershell ())
 533 # undef setusershell
 534 # define setusershell() \
 535     (GL_LINK_WARNING ("setusershell is unportable - " \
 536                       "use gnulib module getusershell for portability"), \
 537      setusershell ())
 538 # undef endusershell
 539 # define endusershell() \
 540     (GL_LINK_WARNING ("endusershell is unportable - " \
 541                       "use gnulib module getusershell for portability"), \
 542      endusershell ())
 543 #endif
 544
 545
 546 #if @GNULIB_LCHOWN@
 547 # if @REPLACE_LCHOWN@
 548 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
 549    to GID (if GID is not -1).  Do not follow symbolic links.
 550    Return 0 if successful, otherwise -1 and errno set.
 551    See the POSIX:2001 specification
 552    <http://www.opengroup.org/susv3xsh/lchown.html>.  */
 553 #  define lchown rpl_lchown
 554 extern int lchown (char const *file, uid_t owner, gid_t group);
 555 # endif
 556 #elif defined GNULIB_POSIXCHECK
 557 # undef lchown
 558 # define lchown(f,u,g) \
 559     (GL_LINK_WARNING ("lchown is unportable to pre-POSIX.1-2001 " \
 560                       "systems - use gnulib module lchown for portability"), \
 561      lchown (f, u, g))
 562 #endif
 563
 564
 565 #if @GNULIB_LINK@
 566 # if @REPLACE_LINK@
 567 #  define link rpl_link
 568 # endif
 569 /* Create a new hard link for an existing file.
 570    Return 0 if successful, otherwise -1 and errno set.
 571    See POSIX:2001 specification
 572    <http://www.opengroup.org/susv3xsh/link.html>.  */
 573 # if !@HAVE_LINK@ || @REPLACE_LINK@
 574 extern int link (const char *path1, const char *path2);
 575 # endif
 576 #elif defined GNULIB_POSIXCHECK
 577 # undef link
 578 # define link(path1,path2) \
 579     (GL_LINK_WARNING ("link is unportable - " \
 580                       "use gnulib module link for portability"), \
 581      link (path1, path2))
 582 #endif
 583
 584 #if @GNULIB_LINKAT@
 585 # if @REPLACE_LINKAT@
 586 #  undef linkat
 587 #  define linkat rpl_linkat
 588 # endif
 589 /* Create a new hard link for an existing file, relative to two
 590    directories.  FLAG controls whether symlinks are followed.
 591    Return 0 if successful, otherwise -1 and errno set.  */
 592 # if !@HAVE_LINKAT@ || @REPLACE_LINKAT@
 593 extern int linkat (int fd1, const char *path1, int fd2, const char *path2,
 594                    int flag);
 595 # endif
 596 #elif defined GNULIB_POSIXCHECK
 597 # undef linkat
 598 # define link(f1,path1,f2,path2,f)              \
 599     (GL_LINK_WARNING ("linkat is unportable - " \
 600                       "use gnulib module linkat for portability"), \
 601      linkat (f1, path1, f2, path2,f))
 602 #endif
 603
 604 #if @GNULIB_LSEEK@
 605 # if @REPLACE_LSEEK@
 606 /* Set the offset of FD relative to SEEK_SET, SEEK_CUR, or SEEK_END.
 607    Return the new offset if successful, otherwise -1 and errno set.
 608    See the POSIX:2001 specification
 609    <http://www.opengroup.org/susv3xsh/lseek.html>.  */
 610 #  define lseek rpl_lseek
 611    extern off_t lseek (int fd, off_t offset, int whence);
 612 # endif
 613 #elif defined GNULIB_POSIXCHECK
 614 # undef lseek
 615 # define lseek(f,o,w) \
 616     (GL_LINK_WARNING ("lseek does not fail with ESPIPE on pipes on some " \
 617                       "systems - use gnulib module lseek for portability"), \
 618      lseek (f, o, w))
 619 #endif
 620
 621
 622 #if @GNULIB_PIPE2@
 623 /* Create a pipe, applying the given flags when opening the read-end of the
 624    pipe and the write-end of the pipe.
 625    The flags are a bitmask, possibly including O_CLOEXEC (defined in <fcntl.h>)
 626    and O_TEXT, O_BINARY (defined in "binary-io.h").
 627    Store the read-end as fd[0] and the write-end as fd[1].
 628    Return 0 upon success, or -1 with errno set upon failure.
 629    See also the Linux man page at
 630    <http://www.kernel.org/doc/man-pages/online/pages/man2/pipe2.2.html>.  */
 631 # if @HAVE_PIPE2@
 632 #  define pipe2 rpl_pipe2
 633 # endif
 634 extern int pipe2 (int fd[2], int flags);
 635 #elif defined GNULIB_POSIXCHECK
 636 # undef pipe2
 637 # define pipe2(f,o) \
 638     (GL_LINK_WARNING ("pipe2 is unportable - " \
 639                       "use gnulib module pipe2 for portability"), \
 640      pipe2 (f, o))
 641 #endif
 642
 643
 644 #if @GNULIB_READLINK@
 645 # if @REPLACE_READLINK@
 646 #  define readlink rpl_readlink
 647 # endif
 648 /* Read the contents of the symbolic link FILE and place the first BUFSIZE
 649    bytes of it into BUF.  Return the number of bytes placed into BUF if
 650    successful, otherwise -1 and errno set.
 651    See the POSIX:2001 specification
 652    <http://www.opengroup.org/susv3xsh/readlink.html>.  */
 653 # if !@HAVE_READLINK@ || @REPLACE_READLINK@
 654 extern ssize_t readlink (const char *file, char *buf, size_t bufsize);
 655 # endif
 656 #elif defined GNULIB_POSIXCHECK
 657 # undef readlink
 658 # define readlink(f,b,s) \
 659     (GL_LINK_WARNING ("readlink is unportable - " \
 660                       "use gnulib module readlink for portability"), \
 661      readlink (f, b, s))
 662 #endif
 663
 664
 665 #if @GNULIB_READLINKAT@
 666 # if !@HAVE_READLINKAT@
 667 ssize_t readlinkat (int fd, char const *file, char *buf, size_t len);
 668 # endif
 669 #elif defined GNULIB_POSIXCHECK
 670 # undef readlinkat
 671 # define readlinkat(d,n,b,l)                         \
 672     (GL_LINK_WARNING ("readlinkat is not portable - " \
 673                       "use gnulib module symlinkat for portability"), \
 674      readlinkat (d, n, b, l))
 675 #endif
 676
 677
 678 #if @GNULIB_RMDIR@
 679 # if @REPLACE_RMDIR@
 680 #  define rmdir rpl_rmdir
 681 /* Remove the directory DIR.  */
 682 extern int rmdir (char const *name);
 683 # endif
 684 #elif defined GNULIB_POSIXCHECK
 685 # undef rmdir
 686 # define rmdir(n) \
 687     (GL_LINK_WARNING ("rmdir is unportable - " \
 688                       "use gnulib module rmdir for portability"), \
 689      rmdir (n))
 690 #endif
 691
 692
 693 #if @GNULIB_SLEEP@
 694 /* Pause the execution of the current thread for N seconds.
 695    Returns the number of seconds left to sleep.
 696    See the POSIX:2001 specification
 697    <http://www.opengroup.org/susv3xsh/sleep.html>.  */
 698 # if !@HAVE_SLEEP@
 699 extern unsigned int sleep (unsigned int n);
 700 # endif
 701 #elif defined GNULIB_POSIXCHECK
 702 # undef sleep
 703 # define sleep(n) \
 704     (GL_LINK_WARNING ("sleep is unportable - " \
 705                       "use gnulib module sleep for portability"), \
 706      sleep (n))
 707 #endif
 708
 709
 710 #if @GNULIB_SYMLINK@
 711 # if @REPLACE_SYMLINK@
 712 #  undef symlink
 713 #  define symlink rpl_symlink
 714 # endif
 715 # if !@HAVE_SYMLINK@ || @REPLACE_SYMLINK@
 716 int symlink (char const *contents, char const *file);
 717 # endif
 718 #elif defined GNULIB_POSIXCHECK
 719 # undef symlink
 720 # define symlink(c,n)                        \
 721     (GL_LINK_WARNING ("symlink is not portable - " \
 722                       "use gnulib module symlink for portability"), \
 723      symlink (c, n))
 724 #endif
 725
 726
 727 #if @GNULIB_SYMLINKAT@
 728 # if !@HAVE_SYMLINKAT@
 729 int symlinkat (char const *contents, int fd, char const *file);
 730 # endif
 731 #elif defined GNULIB_POSIXCHECK
 732 # undef symlinkat
 733 # define symlinkat(c,d,n)                            \
 734     (GL_LINK_WARNING ("symlinkat is not portable - " \
 735                       "use gnulib module symlinkat for portability"), \
 736      symlinkat (c, d, n))
 737 #endif
 738
 739
 740 #if @GNULIB_UNLINK@
 741 # if @REPLACE_UNLINK@
 742 #  undef unlink
 743 #  define unlink rpl_unlink
 744 extern int unlink (char const *file);
 745 # endif
 746 #elif defined GNULIB_POSIXCHECK
 747 # undef unlink
 748 # define unlink(n)                         \
 749     (GL_LINK_WARNING ("unlink is not portable - " \
 750                       "use gnulib module unlink for portability"), \
 751      unlink (n))
 752 #endif
 753
 754
 755 #if @GNULIB_UNLINKAT@
 756 # if @REPLACE_UNLINKAT@
 757 #  undef unlinkat
 758 #  define unlinkat rpl_unlinkat
 759 # endif
 760 # if !@HAVE_UNLINKAT@ || @REPLACE_UNLINKAT@
 761 extern int unlinkat (int fd, char const *file, int flag);
 762 # endif
 763 #elif defined GNULIB_POSIXCHECK
 764 # undef unlinkat
 765 # define unlinkat(d,n,f)                         \
 766     (GL_LINK_WARNING ("unlinkat is not portable - " \
 767                       "use gnulib module openat for portability"), \
 768      unlinkat (d, n, f))
 769 #endif
 770
 771
 772 #if @GNULIB_WRITE@ && @REPLACE_WRITE@ && @GNULIB_UNISTD_H_SIGPIPE@
 773 /* Write up to COUNT bytes starting at BUF to file descriptor FD.
 774    See the POSIX:2001 specification
 775    <http://www.opengroup.org/susv3xsh/write.html>.  */
 776 # undef write
 777 # define write rpl_write
 778 extern ssize_t write (int fd, const void *buf, size_t count);
 779 #endif
 780
 781
 782 #ifdef __cplusplus
 783 }
 784 #endif
 785
 786
 787 #endif /* _GL_UNISTD_H */
 788 #endif /* _GL_UNISTD_H */