lib/unistd.in.h

   1 /* Substitute for and wrapper around <unistd.h>.
   2    Copyright (C) 2003-2011 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 General Public License as published by
   6    the Free Software Foundation; either version 3, 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 General Public License for more details.
  13
  14    You should have received a copy of the GNU 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 #if __GNUC__ >= 3
  19 @PRAGMA_SYSTEM_HEADER@
  20 #endif
  21 @PRAGMA_COLUMNS@
  22
  23 /* Special invocation convention:
  24    - On mingw, several headers, including <winsock2.h>, include <unistd.h>,
  25      but we need to ensure that both the system <unistd.h> and <winsock2.h>
  26      are completely included before we replace gethostname.  */
  27 #if @GNULIB_GETHOSTNAME@ && @UNISTD_H_HAVE_WINSOCK2_H@ \
  28   && !defined _GL_WINSOCK2_H_WITNESS && defined _WINSOCK2_H
  29 /* <unistd.h> is being indirectly included for the first time from
  30    <winsock2.h>; avoid declaring any overrides.  */
  31 # if @HAVE_UNISTD_H@
  32 #  @INCLUDE_NEXT@ @NEXT_UNISTD_H@
  33 # else
  34 #  error unexpected; report this to bug-gnulib@gnu.org
  35 # endif
  36 # define _GL_WINSOCK2_H_WITNESS
  37
  38 /* Normal invocation.  */
  39 #elif !defined _GL_UNISTD_H
  40
  41 /* The include_next requires a split double-inclusion guard.  */
  42 #if @HAVE_UNISTD_H@
  43 # @INCLUDE_NEXT@ @NEXT_UNISTD_H@
  44 #endif
  45
  46 /* Get all possible declarations of gethostname().  */
  47 #if @GNULIB_GETHOSTNAME@ && @UNISTD_H_HAVE_WINSOCK2_H@ \
  48   && !defined _GL_INCLUDING_WINSOCK2_H
  49 # define _GL_INCLUDING_WINSOCK2_H
  50 # include <winsock2.h>
  51 # undef _GL_INCLUDING_WINSOCK2_H
  52 #endif
  53
  54 #if !defined _GL_UNISTD_H && !defined _GL_INCLUDING_WINSOCK2_H
  55 #define _GL_UNISTD_H
  56
  57 /* NetBSD 5.0 mis-defines NULL.  Also get size_t.  */
  58 #include <stddef.h>
  59
  60 /* mingw doesn't define the SEEK_* or *_FILENO macros in <unistd.h>.  */
  61 /* Cygwin 1.7.1 declares symlinkat in <stdio.h>, not in <unistd.h>.  */
  62 /* But avoid namespace pollution on glibc systems.  */
  63 #if (!(defined SEEK_CUR && defined SEEK_END && defined SEEK_SET) \
  64      || ((@GNULIB_SYMLINKAT@ || defined GNULIB_POSIXCHECK) \
  65          && defined __CYGWIN__)) \
  66     && ! defined __GLIBC__
  67 # include <stdio.h>
  68 #endif
  69
  70 /* Cygwin 1.7.1 declares unlinkat in <fcntl.h>, not in <unistd.h>.  */
  71 /* But avoid namespace pollution on glibc systems.  */
  72 #if (@GNULIB_UNLINKAT@ || defined GNULIB_POSIXCHECK) && defined __CYGWIN__ \
  73     && ! defined __GLIBC__
  74 # include <fcntl.h>
  75 #endif
  76
  77 /* mingw fails to declare _exit in <unistd.h>.  */
  78 /* mingw, BeOS, Haiku declare environ in <stdlib.h>, not in <unistd.h>.  */
  79 /* Solaris declares getcwd not only in <unistd.h> but also in <stdlib.h>.  */
  80 /* But avoid namespace pollution on glibc systems.  */
  81 #ifndef __GLIBC__
  82 # include <stdlib.h>
  83 #endif
  84
  85 /* mingw declares getcwd in <io.h>, not in <unistd.h>.  */
  86 #if ((@GNULIB_GETCWD@ || defined GNULIB_POSIXCHECK) \
  87      && ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
  88 # include <io.h>
  89 #endif
  90
  91 /* AIX and OSF/1 5.1 declare getdomainname in <netdb.h>, not in <unistd.h>.
  92    NonStop Kernel declares gethostname in <netdb.h>, not in <unistd.h>.  */
  93 /* But avoid namespace pollution on glibc systems.  */
  94 #if ((@GNULIB_GETDOMAINNAME@ && (defined _AIX || defined __osf__)) \
  95      || (@GNULIB_GETHOSTNAME@ && defined __TANDEM)) \
  96     && !defined __GLIBC__
  97 # include <netdb.h>
  98 #endif
  99
 100 #if (@GNULIB_WRITE@ || @GNULIB_READLINK@ || @GNULIB_READLINKAT@ \
 101      || @GNULIB_PREAD@ || @GNULIB_PWRITE@ || defined GNULIB_POSIXCHECK)
 102 /* Get ssize_t.  */
 103 # include <sys/types.h>
 104 #endif
 105
 106 /* Get getopt(), optarg, optind, opterr, optopt.
 107    But avoid namespace pollution on glibc systems.  */
 108 #if @GNULIB_UNISTD_H_GETOPT@ && !defined __GLIBC__ && !defined _GL_SYSTEM_GETOPT
 109 # include <getopt.h>
 110 #endif
 111
 112 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
 113
 114 /* The definition of _GL_ARG_NONNULL is copied here.  */
 115
 116 /* The definition of _GL_WARN_ON_USE is copied here.  */
 117
 118
 119 #if @GNULIB_GETHOSTNAME@
 120 /* Get all possible declarations of gethostname().  */
 121 # if @UNISTD_H_HAVE_WINSOCK2_H@
 122 #  if !defined _GL_SYS_SOCKET_H
 123 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 124 #    undef socket
 125 #    define socket              socket_used_without_including_sys_socket_h
 126 #    undef connect
 127 #    define connect             connect_used_without_including_sys_socket_h
 128 #    undef accept
 129 #    define accept              accept_used_without_including_sys_socket_h
 130 #    undef bind
 131 #    define bind                bind_used_without_including_sys_socket_h
 132 #    undef getpeername
 133 #    define getpeername         getpeername_used_without_including_sys_socket_h
 134 #    undef getsockname
 135 #    define getsockname         getsockname_used_without_including_sys_socket_h
 136 #    undef getsockopt
 137 #    define getsockopt          getsockopt_used_without_including_sys_socket_h
 138 #    undef listen
 139 #    define listen              listen_used_without_including_sys_socket_h
 140 #    undef recv
 141 #    define recv                recv_used_without_including_sys_socket_h
 142 #    undef send
 143 #    define send                send_used_without_including_sys_socket_h
 144 #    undef recvfrom
 145 #    define recvfrom            recvfrom_used_without_including_sys_socket_h
 146 #    undef sendto
 147 #    define sendto              sendto_used_without_including_sys_socket_h
 148 #    undef setsockopt
 149 #    define setsockopt          setsockopt_used_without_including_sys_socket_h
 150 #    undef shutdown
 151 #    define shutdown            shutdown_used_without_including_sys_socket_h
 152 #   else
 153      _GL_WARN_ON_USE (socket,
 154                       "socket() used without including <sys/socket.h>");
 155      _GL_WARN_ON_USE (connect,
 156                       "connect() used without including <sys/socket.h>");
 157      _GL_WARN_ON_USE (accept,
 158                       "accept() used without including <sys/socket.h>");
 159      _GL_WARN_ON_USE (bind,
 160                       "bind() used without including <sys/socket.h>");
 161      _GL_WARN_ON_USE (getpeername,
 162                       "getpeername() used without including <sys/socket.h>");
 163      _GL_WARN_ON_USE (getsockname,
 164                       "getsockname() used without including <sys/socket.h>");
 165      _GL_WARN_ON_USE (getsockopt,
 166                       "getsockopt() used without including <sys/socket.h>");
 167      _GL_WARN_ON_USE (listen,
 168                       "listen() used without including <sys/socket.h>");
 169      _GL_WARN_ON_USE (recv,
 170                       "recv() used without including <sys/socket.h>");
 171      _GL_WARN_ON_USE (send,
 172                       "send() used without including <sys/socket.h>");
 173      _GL_WARN_ON_USE (recvfrom,
 174                       "recvfrom() used without including <sys/socket.h>");
 175      _GL_WARN_ON_USE (sendto,
 176                       "sendto() used without including <sys/socket.h>");
 177      _GL_WARN_ON_USE (setsockopt,
 178                       "setsockopt() used without including <sys/socket.h>");
 179      _GL_WARN_ON_USE (shutdown,
 180                       "shutdown() used without including <sys/socket.h>");
 181 #   endif
 182 #  endif
 183 #  if !defined _GL_SYS_SELECT_H
 184 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 185 #    undef select
 186 #    define select              select_used_without_including_sys_select_h
 187 #   else
 188      _GL_WARN_ON_USE (select,
 189                       "select() used without including <sys/select.h>");
 190 #   endif
 191 #  endif
 192 # endif
 193 #endif
 194
 195
 196 /* OS/2 EMX lacks these macros.  */
 197 #ifndef STDIN_FILENO
 198 # define STDIN_FILENO 0
 199 #endif
 200 #ifndef STDOUT_FILENO
 201 # define STDOUT_FILENO 1
 202 #endif
 203 #ifndef STDERR_FILENO
 204 # define STDERR_FILENO 2
 205 #endif
 206
 207 /* Ensure *_OK macros exist.  */
 208 #ifndef F_OK
 209 # define F_OK 0
 210 # define X_OK 1
 211 # define W_OK 2
 212 # define R_OK 4
 213 #endif
 214
 215
 216 /* Declare overridden functions.  */
 217
 218
 219 #if defined GNULIB_POSIXCHECK
 220 /* The access() function is a security risk.  */
 221 _GL_WARN_ON_USE (access, "the access function is a security risk - "
 222                  "use the gnulib module faccessat instead");
 223 #endif
 224
 225
 226 #if @GNULIB_CHOWN@
 227 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
 228    to GID (if GID is not -1).  Follow symbolic links.
 229    Return 0 if successful, otherwise -1 and errno set.
 230    See the POSIX:2001 specification
 231    <http://www.opengroup.org/susv3xsh/chown.html>.  */
 232 # if @REPLACE_CHOWN@
 233 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 234 #   undef chown
 235 #   define chown rpl_chown
 236 #  endif
 237 _GL_FUNCDECL_RPL (chown, int, (const char *file, uid_t uid, gid_t gid)
 238                               _GL_ARG_NONNULL ((1)));
 239 _GL_CXXALIAS_RPL (chown, int, (const char *file, uid_t uid, gid_t gid));
 240 # else
 241 #  if !@HAVE_CHOWN@
 242 _GL_FUNCDECL_SYS (chown, int, (const char *file, uid_t uid, gid_t gid)
 243                               _GL_ARG_NONNULL ((1)));
 244 #  endif
 245 _GL_CXXALIAS_SYS (chown, int, (const char *file, uid_t uid, gid_t gid));
 246 # endif
 247 _GL_CXXALIASWARN (chown);
 248 #elif defined GNULIB_POSIXCHECK
 249 # undef chown
 250 # if HAVE_RAW_DECL_CHOWN
 251 _GL_WARN_ON_USE (chown, "chown fails to follow symlinks on some systems and "
 252                  "doesn't treat a uid or gid of -1 on some systems - "
 253                  "use gnulib module chown for portability");
 254 # endif
 255 #endif
 256
 257
 258 #if @GNULIB_CLOSE@
 259 # if @REPLACE_CLOSE@
 260 /* Automatically included by modules that need a replacement for close.  */
 261 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 262 #   undef close
 263 #   define close rpl_close
 264 #  endif
 265 _GL_FUNCDECL_RPL (close, int, (int fd));
 266 _GL_CXXALIAS_RPL (close, int, (int fd));
 267 # else
 268 _GL_CXXALIAS_SYS (close, int, (int fd));
 269 # endif
 270 _GL_CXXALIASWARN (close);
 271 #elif @UNISTD_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS@
 272 # undef close
 273 # define close close_used_without_requesting_gnulib_module_close
 274 #elif defined GNULIB_POSIXCHECK
 275 # undef close
 276 /* Assume close is always declared.  */
 277 _GL_WARN_ON_USE (close, "close does not portably work on sockets - "
 278                  "use gnulib module close for portability");
 279 #endif
 280
 281
 282 #if @REPLACE_DUP@
 283 # if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 284 #  define dup rpl_dup
 285 # endif
 286 _GL_FUNCDECL_RPL (dup, int, (int oldfd));
 287 _GL_CXXALIAS_RPL (dup, int, (int oldfd));
 288 #else
 289 _GL_CXXALIAS_SYS (dup, int, (int oldfd));
 290 #endif
 291 _GL_CXXALIASWARN (dup);
 292
 293
 294 #if @GNULIB_DUP2@
 295 /* Copy the file descriptor OLDFD into file descriptor NEWFD.  Do nothing if
 296    NEWFD = OLDFD, otherwise close NEWFD first if it is open.
 297    Return newfd if successful, otherwise -1 and errno set.
 298    See the POSIX:2001 specification
 299    <http://www.opengroup.org/susv3xsh/dup2.html>.  */
 300 # if @REPLACE_DUP2@
 301 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 302 #   define dup2 rpl_dup2
 303 #  endif
 304 _GL_FUNCDECL_RPL (dup2, int, (int oldfd, int newfd));
 305 _GL_CXXALIAS_RPL (dup2, int, (int oldfd, int newfd));
 306 # else
 307 #  if !@HAVE_DUP2@
 308 _GL_FUNCDECL_SYS (dup2, int, (int oldfd, int newfd));
 309 #  endif
 310 _GL_CXXALIAS_SYS (dup2, int, (int oldfd, int newfd));
 311 # endif
 312 _GL_CXXALIASWARN (dup2);
 313 #elif defined GNULIB_POSIXCHECK
 314 # undef dup2
 315 # if HAVE_RAW_DECL_DUP2
 316 _GL_WARN_ON_USE (dup2, "dup2 is unportable - "
 317                  "use gnulib module dup2 for portability");
 318 # endif
 319 #endif
 320
 321
 322 #if @GNULIB_DUP3@
 323 /* Copy the file descriptor OLDFD into file descriptor NEWFD, with the
 324    specified flags.
 325    The flags are a bitmask, possibly including O_CLOEXEC (defined in <fcntl.h>)
 326    and O_TEXT, O_BINARY (defined in "binary-io.h").
 327    Close NEWFD first if it is open.
 328    Return newfd if successful, otherwise -1 and errno set.
 329    See the Linux man page at
 330    <http://www.kernel.org/doc/man-pages/online/pages/man2/dup3.2.html>.  */
 331 # if @HAVE_DUP3@
 332 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 333 #   define dup3 rpl_dup3
 334 #  endif
 335 _GL_FUNCDECL_RPL (dup3, int, (int oldfd, int newfd, int flags));
 336 _GL_CXXALIAS_RPL (dup3, int, (int oldfd, int newfd, int flags));
 337 # else
 338 _GL_FUNCDECL_SYS (dup3, int, (int oldfd, int newfd, int flags));
 339 _GL_CXXALIAS_SYS (dup3, int, (int oldfd, int newfd, int flags));
 340 # endif
 341 _GL_CXXALIASWARN (dup3);
 342 #elif defined GNULIB_POSIXCHECK
 343 # undef dup3
 344 # if HAVE_RAW_DECL_DUP3
 345 _GL_WARN_ON_USE (dup3, "dup3 is unportable - "
 346                  "use gnulib module dup3 for portability");
 347 # endif
 348 #endif
 349
 350
 351 #if @GNULIB_ENVIRON@
 352 # if !@HAVE_DECL_ENVIRON@
 353 /* Set of environment variables and values.  An array of strings of the form
 354    "VARIABLE=VALUE", terminated with a NULL.  */
 355 #  if defined __APPLE__ && defined __MACH__
 356 #   include <crt_externs.h>
 357 #   define environ (*_NSGetEnviron ())
 358 #  else
 359 #   ifdef __cplusplus
 360 extern "C" {
 361 #   endif
 362 extern char **environ;
 363 #   ifdef __cplusplus
 364 }
 365 #   endif
 366 #  endif
 367 # endif
 368 #elif defined GNULIB_POSIXCHECK
 369 # if HAVE_RAW_DECL_ENVIRON
 370 static inline char ***
 371 rpl_environ (void)
 372 {
 373   return &environ;
 374 }
 375 _GL_WARN_ON_USE (rpl_environ, "environ is unportable - "
 376                  "use gnulib module environ for portability");
 377 #  undef environ
 378 #  define environ (*rpl_environ ())
 379 # endif
 380 #endif
 381
 382
 383 #if @GNULIB_EUIDACCESS@
 384 /* Like access(), except that it uses the effective user id and group id of
 385    the current process.  */
 386 # if !@HAVE_EUIDACCESS@
 387 _GL_FUNCDECL_SYS (euidaccess, int, (const char *filename, int mode)
 388                                    _GL_ARG_NONNULL ((1)));
 389 # endif
 390 _GL_CXXALIAS_SYS (euidaccess, int, (const char *filename, int mode));
 391 _GL_CXXALIASWARN (euidaccess);
 392 # if defined GNULIB_POSIXCHECK
 393 /* Like access(), this function is a security risk.  */
 394 _GL_WARN_ON_USE (euidaccess, "the euidaccess function is a security risk - "
 395                  "use the gnulib module faccessat instead");
 396 # endif
 397 #elif defined GNULIB_POSIXCHECK
 398 # undef euidaccess
 399 # if HAVE_RAW_DECL_EUIDACCESS
 400 _GL_WARN_ON_USE (euidaccess, "euidaccess is unportable - "
 401                  "use gnulib module euidaccess for portability");
 402 # endif
 403 #endif
 404
 405
 406 #if @GNULIB_FACCESSAT@
 407 # if !@HAVE_FACCESSAT@
 408 _GL_FUNCDECL_SYS (faccessat, int,
 409                   (int fd, char const *file, int mode, int flag)
 410                   _GL_ARG_NONNULL ((2)));
 411 # endif
 412 _GL_CXXALIAS_SYS (faccessat, int,
 413                   (int fd, char const *file, int mode, int flag));
 414 _GL_CXXALIASWARN (faccessat);
 415 #elif defined GNULIB_POSIXCHECK
 416 # undef faccessat
 417 # if HAVE_RAW_DECL_FACCESSAT
 418 _GL_WARN_ON_USE (faccessat, "faccessat is not portable - "
 419                  "use gnulib module faccessat for portability");
 420 # endif
 421 #endif
 422
 423
 424 #if @GNULIB_FCHDIR@
 425 /* Change the process' current working directory to the directory on which
 426    the given file descriptor is open.
 427    Return 0 if successful, otherwise -1 and errno set.
 428    See the POSIX:2001 specification
 429    <http://www.opengroup.org/susv3xsh/fchdir.html>.  */
 430 # if ! @HAVE_FCHDIR@
 431 _GL_FUNCDECL_SYS (fchdir, int, (int /*fd*/));
 432
 433 /* Gnulib internal hooks needed to maintain the fchdir metadata.  */
 434 _GL_EXTERN_C int _gl_register_fd (int fd, const char *filename)
 435      _GL_ARG_NONNULL ((2));
 436 _GL_EXTERN_C void _gl_unregister_fd (int fd);
 437 _GL_EXTERN_C int _gl_register_dup (int oldfd, int newfd);
 438 _GL_EXTERN_C const char *_gl_directory_name (int fd);
 439
 440 # else
 441 #  if !@HAVE_DECL_FCHDIR@
 442 _GL_FUNCDECL_SYS (fchdir, int, (int /*fd*/));
 443 #  endif
 444 # endif
 445 _GL_CXXALIAS_SYS (fchdir, int, (int /*fd*/));
 446 _GL_CXXALIASWARN (fchdir);
 447 #elif defined GNULIB_POSIXCHECK
 448 # undef fchdir
 449 # if HAVE_RAW_DECL_FCHDIR
 450 _GL_WARN_ON_USE (fchdir, "fchdir is unportable - "
 451                  "use gnulib module fchdir for portability");
 452 # endif
 453 #endif
 454
 455
 456 #if @GNULIB_FCHOWNAT@
 457 # if @REPLACE_FCHOWNAT@
 458 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 459 #   undef fchownat
 460 #   define fchownat rpl_fchownat
 461 #  endif
 462 _GL_FUNCDECL_RPL (fchownat, int, (int fd, char const *file,
 463                                   uid_t owner, gid_t group, int flag)
 464                                  _GL_ARG_NONNULL ((2)));
 465 _GL_CXXALIAS_RPL (fchownat, int, (int fd, char const *file,
 466                                   uid_t owner, gid_t group, int flag));
 467 # else
 468 #  if !@HAVE_FCHOWNAT@
 469 _GL_FUNCDECL_SYS (fchownat, int, (int fd, char const *file,
 470                                   uid_t owner, gid_t group, int flag)
 471                                  _GL_ARG_NONNULL ((2)));
 472 #  endif
 473 _GL_CXXALIAS_SYS (fchownat, int, (int fd, char const *file,
 474                                   uid_t owner, gid_t group, int flag));
 475 # endif
 476 _GL_CXXALIASWARN (fchownat);
 477 #elif defined GNULIB_POSIXCHECK
 478 # undef fchownat
 479 # if HAVE_RAW_DECL_FCHOWNAT
 480 _GL_WARN_ON_USE (fchownat, "fchownat is not portable - "
 481                  "use gnulib module openat for portability");
 482 # endif
 483 #endif
 484
 485
 486 #if @GNULIB_FSYNC@
 487 /* Synchronize changes to a file.
 488    Return 0 if successful, otherwise -1 and errno set.
 489    See POSIX:2001 specification
 490    <http://www.opengroup.org/susv3xsh/fsync.html>.  */
 491 # if !@HAVE_FSYNC@
 492 _GL_FUNCDECL_SYS (fsync, int, (int fd));
 493 # endif
 494 _GL_CXXALIAS_SYS (fsync, int, (int fd));
 495 _GL_CXXALIASWARN (fsync);
 496 #elif defined GNULIB_POSIXCHECK
 497 # undef fsync
 498 # if HAVE_RAW_DECL_FSYNC
 499 _GL_WARN_ON_USE (fsync, "fsync is unportable - "
 500                  "use gnulib module fsync for portability");
 501 # endif
 502 #endif
 503
 504
 505 #if @GNULIB_FTRUNCATE@
 506 /* Change the size of the file to which FD is opened to become equal to LENGTH.
 507    Return 0 if successful, otherwise -1 and errno set.
 508    See the POSIX:2001 specification
 509    <http://www.opengroup.org/susv3xsh/ftruncate.html>.  */
 510 # if !@HAVE_FTRUNCATE@
 511 _GL_FUNCDECL_SYS (ftruncate, int, (int fd, off_t length));
 512 # endif
 513 _GL_CXXALIAS_SYS (ftruncate, int, (int fd, off_t length));
 514 _GL_CXXALIASWARN (ftruncate);
 515 #elif defined GNULIB_POSIXCHECK
 516 # undef ftruncate
 517 # if HAVE_RAW_DECL_FTRUNCATE
 518 _GL_WARN_ON_USE (ftruncate, "ftruncate is unportable - "
 519                  "use gnulib module ftruncate for portability");
 520 # endif
 521 #endif
 522
 523
 524 #if @GNULIB_GETCWD@
 525 /* Get the name of the current working directory, and put it in SIZE bytes
 526    of BUF.
 527    Return BUF if successful, or NULL if the directory couldn't be determined
 528    or SIZE was too small.
 529    See the POSIX:2001 specification
 530    <http://www.opengroup.org/susv3xsh/getcwd.html>.
 531    Additionally, the gnulib module 'getcwd' guarantees the following GNU
 532    extension: If BUF is NULL, an array is allocated with 'malloc'; the array
 533    is SIZE bytes long, unless SIZE == 0, in which case it is as big as
 534    necessary.  */
 535 # if @REPLACE_GETCWD@
 536 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 537 #   define getcwd rpl_getcwd
 538 #  endif
 539 _GL_FUNCDECL_RPL (getcwd, char *, (char *buf, size_t size));
 540 _GL_CXXALIAS_RPL (getcwd, char *, (char *buf, size_t size));
 541 # else
 542 /* Need to cast, because on mingw, the second parameter is
 543                                                    int size.  */
 544 _GL_CXXALIAS_SYS_CAST (getcwd, char *, (char *buf, size_t size));
 545 # endif
 546 _GL_CXXALIASWARN (getcwd);
 547 #elif defined GNULIB_POSIXCHECK
 548 # undef getcwd
 549 # if HAVE_RAW_DECL_GETCWD
 550 _GL_WARN_ON_USE (getcwd, "getcwd is unportable - "
 551                  "use gnulib module getcwd for portability");
 552 # endif
 553 #endif
 554
 555
 556 #if @GNULIB_GETDOMAINNAME@
 557 /* Return the NIS domain name of the machine.
 558    WARNING! The NIS domain name is unrelated to the fully qualified host name
 559             of the machine.  It is also unrelated to email addresses.
 560    WARNING! The NIS domain name is usually the empty string or "(none)" when
 561             not using NIS.
 562
 563    Put up to LEN bytes of the NIS domain name into NAME.
 564    Null terminate it if the name is shorter than LEN.
 565    If the NIS domain name is longer than LEN, set errno = EINVAL and return -1.
 566    Return 0 if successful, otherwise set errno and return -1.  */
 567 # if @REPLACE_GETDOMAINNAME@
 568 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 569 #   undef getdomainname
 570 #   define getdomainname rpl_getdomainname
 571 #  endif
 572 _GL_FUNCDECL_RPL (getdomainname, int, (char *name, size_t len)
 573                                       _GL_ARG_NONNULL ((1)));
 574 _GL_CXXALIAS_RPL (getdomainname, int, (char *name, size_t len));
 575 # else
 576 #  if !@HAVE_DECL_GETDOMAINNAME@
 577 _GL_FUNCDECL_SYS (getdomainname, int, (char *name, size_t len)
 578                                       _GL_ARG_NONNULL ((1)));
 579 #  endif
 580 _GL_CXXALIAS_SYS (getdomainname, int, (char *name, size_t len));
 581 # endif
 582 _GL_CXXALIASWARN (getdomainname);
 583 #elif defined GNULIB_POSIXCHECK
 584 # undef getdomainname
 585 # if HAVE_RAW_DECL_GETDOMAINNAME
 586 _GL_WARN_ON_USE (getdomainname, "getdomainname is unportable - "
 587                  "use gnulib module getdomainname for portability");
 588 # endif
 589 #endif
 590
 591
 592 #if @GNULIB_GETDTABLESIZE@
 593 /* Return the maximum number of file descriptors in the current process.
 594    In POSIX, this is same as sysconf (_SC_OPEN_MAX).  */
 595 # if !@HAVE_GETDTABLESIZE@
 596 _GL_FUNCDECL_SYS (getdtablesize, int, (void));
 597 # endif
 598 _GL_CXXALIAS_SYS (getdtablesize, int, (void));
 599 _GL_CXXALIASWARN (getdtablesize);
 600 #elif defined GNULIB_POSIXCHECK
 601 # undef getdtablesize
 602 # if HAVE_RAW_DECL_GETDTABLESIZE
 603 _GL_WARN_ON_USE (getdtablesize, "getdtablesize is unportable - "
 604                  "use gnulib module getdtablesize for portability");
 605 # endif
 606 #endif
 607
 608
 609 #if @GNULIB_GETGROUPS@
 610 /* Return the supplemental groups that the current process belongs to.
 611    It is unspecified whether the effective group id is in the list.
 612    If N is 0, return the group count; otherwise, N describes how many
 613    entries are available in GROUPS.  Return -1 and set errno if N is
 614    not 0 and not large enough.  Fails with ENOSYS on some systems.  */
 615 # if @REPLACE_GETGROUPS@
 616 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 617 #   undef getgroups
 618 #   define getgroups rpl_getgroups
 619 #  endif
 620 _GL_FUNCDECL_RPL (getgroups, int, (int n, gid_t *groups));
 621 _GL_CXXALIAS_RPL (getgroups, int, (int n, gid_t *groups));
 622 # else
 623 #  if !@HAVE_GETGROUPS@
 624 _GL_FUNCDECL_SYS (getgroups, int, (int n, gid_t *groups));
 625 #  endif
 626 _GL_CXXALIAS_SYS (getgroups, int, (int n, gid_t *groups));
 627 # endif
 628 _GL_CXXALIASWARN (getgroups);
 629 #elif defined GNULIB_POSIXCHECK
 630 # undef getgroups
 631 # if HAVE_RAW_DECL_GETGROUPS
 632 _GL_WARN_ON_USE (getgroups, "getgroups is unportable - "
 633                  "use gnulib module getgroups for portability");
 634 # endif
 635 #endif
 636
 637
 638 #if @GNULIB_GETHOSTNAME@
 639 /* Return the standard host name of the machine.
 640    WARNING! The host name may or may not be fully qualified.
 641
 642    Put up to LEN bytes of the host name into NAME.
 643    Null terminate it if the name is shorter than LEN.
 644    If the host name is longer than LEN, set errno = EINVAL and return -1.
 645    Return 0 if successful, otherwise set errno and return -1.  */
 646 # if @UNISTD_H_HAVE_WINSOCK2_H@
 647 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 648 #   undef gethostname
 649 #   define gethostname rpl_gethostname
 650 #  endif
 651 _GL_FUNCDECL_RPL (gethostname, int, (char *name, size_t len)
 652                                     _GL_ARG_NONNULL ((1)));
 653 _GL_CXXALIAS_RPL (gethostname, int, (char *name, size_t len));
 654 # else
 655 #  if !@HAVE_GETHOSTNAME@
 656 _GL_FUNCDECL_SYS (gethostname, int, (char *name, size_t len)
 657                                     _GL_ARG_NONNULL ((1)));
 658 #  endif
 659 /* Need to cast, because on Solaris 10 and OSF/1 5.1 systems, the second
 660    parameter is
 661                                                       int len.  */
 662 _GL_CXXALIAS_SYS_CAST (gethostname, int, (char *name, size_t len));
 663 # endif
 664 _GL_CXXALIASWARN (gethostname);
 665 #elif @UNISTD_H_HAVE_WINSOCK2_H@
 666 # undef gethostname
 667 # define gethostname gethostname_used_without_requesting_gnulib_module_gethostname
 668 #elif defined GNULIB_POSIXCHECK
 669 # undef gethostname
 670 # if HAVE_RAW_DECL_GETHOSTNAME
 671 _GL_WARN_ON_USE (gethostname, "gethostname is unportable - "
 672                  "use gnulib module gethostname for portability");
 673 # endif
 674 #endif
 675
 676
 677 #if @GNULIB_GETLOGIN@
 678 /* Returns the user's login name, or NULL if it cannot be found.  Upon error,
 679    returns NULL with errno set.
 680
 681    See <http://www.opengroup.org/susv3xsh/getlogin.html>.
 682
 683    Most programs don't need to use this function, because the information is
 684    available through environment variables:
 685      ${LOGNAME-$USER}        on Unix platforms,
 686      $USERNAME               on native Windows platforms.
 687  */
 688 # if !@HAVE_GETLOGIN@
 689 _GL_FUNCDECL_SYS (getlogin, char *, (void));
 690 # endif
 691 _GL_CXXALIAS_SYS (getlogin, char *, (void));
 692 _GL_CXXALIASWARN (getlogin);
 693 #elif defined GNULIB_POSIXCHECK
 694 # undef getlogin
 695 # if HAVE_RAW_DECL_GETLOGIN
 696 _GL_WARN_ON_USE (getlogin, "getlogin is unportable - "
 697                  "use gnulib module getlogin for portability");
 698 # endif
 699 #endif
 700
 701
 702 #if @GNULIB_GETLOGIN_R@
 703 /* Copies the user's login name to NAME.
 704    The array pointed to by NAME has room for SIZE bytes.
 705
 706    Returns 0 if successful.  Upon error, an error number is returned, or -1 in
 707    the case that the login name cannot be found but no specific error is
 708    provided (this case is hopefully rare but is left open by the POSIX spec).
 709
 710    See <http://www.opengroup.org/susv3xsh/getlogin.html>.
 711
 712    Most programs don't need to use this function, because the information is
 713    available through environment variables:
 714      ${LOGNAME-$USER}        on Unix platforms,
 715      $USERNAME               on native Windows platforms.
 716  */
 717 # if @REPLACE_GETLOGIN_R@
 718 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 719 #   define getlogin_r rpl_getlogin_r
 720 #  endif
 721 _GL_FUNCDECL_RPL (getlogin_r, int, (char *name, size_t size)
 722                                    _GL_ARG_NONNULL ((1)));
 723 _GL_CXXALIAS_RPL (getlogin_r, int, (char *name, size_t size));
 724 # else
 725 #  if !@HAVE_DECL_GETLOGIN_R@
 726 _GL_FUNCDECL_SYS (getlogin_r, int, (char *name, size_t size)
 727                                    _GL_ARG_NONNULL ((1)));
 728 #  endif
 729 /* Need to cast, because on Solaris 10 systems, the second argument is
 730                                                      int size.  */
 731 _GL_CXXALIAS_SYS_CAST (getlogin_r, int, (char *name, size_t size));
 732 # endif
 733 _GL_CXXALIASWARN (getlogin_r);
 734 #elif defined GNULIB_POSIXCHECK
 735 # undef getlogin_r
 736 # if HAVE_RAW_DECL_GETLOGIN_R
 737 _GL_WARN_ON_USE (getlogin_r, "getlogin_r is unportable - "
 738                  "use gnulib module getlogin_r for portability");
 739 # endif
 740 #endif
 741
 742
 743 #if @GNULIB_GETPAGESIZE@
 744 # if @REPLACE_GETPAGESIZE@
 745 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 746 #   define getpagesize rpl_getpagesize
 747 #  endif
 748 _GL_FUNCDECL_RPL (getpagesize, int, (void));
 749 _GL_CXXALIAS_RPL (getpagesize, int, (void));
 750 # else
 751 #  if !@HAVE_GETPAGESIZE@
 752 #   if !defined getpagesize
 753 /* This is for POSIX systems.  */
 754 #    if !defined _gl_getpagesize && defined _SC_PAGESIZE
 755 #     if ! (defined __VMS && __VMS_VER < 70000000)
 756 #      define _gl_getpagesize() sysconf (_SC_PAGESIZE)
 757 #     endif
 758 #    endif
 759 /* This is for older VMS.  */
 760 #    if !defined _gl_getpagesize && defined __VMS
 761 #     ifdef __ALPHA
 762 #      define _gl_getpagesize() 8192
 763 #     else
 764 #      define _gl_getpagesize() 512
 765 #     endif
 766 #    endif
 767 /* This is for BeOS.  */
 768 #    if !defined _gl_getpagesize && @HAVE_OS_H@
 769 #     include <OS.h>
 770 #     if defined B_PAGE_SIZE
 771 #      define _gl_getpagesize() B_PAGE_SIZE
 772 #     endif
 773 #    endif
 774 /* This is for AmigaOS4.0.  */
 775 #    if !defined _gl_getpagesize && defined __amigaos4__
 776 #     define _gl_getpagesize() 2048
 777 #    endif
 778 /* This is for older Unix systems.  */
 779 #    if !defined _gl_getpagesize && @HAVE_SYS_PARAM_H@
 780 #     include <sys/param.h>
 781 #     ifdef EXEC_PAGESIZE
 782 #      define _gl_getpagesize() EXEC_PAGESIZE
 783 #     else
 784 #      ifdef NBPG
 785 #       ifndef CLSIZE
 786 #        define CLSIZE 1
 787 #       endif
 788 #       define _gl_getpagesize() (NBPG * CLSIZE)
 789 #      else
 790 #       ifdef NBPC
 791 #        define _gl_getpagesize() NBPC
 792 #       endif
 793 #      endif
 794 #     endif
 795 #    endif
 796 #    if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 797 #     define getpagesize() _gl_getpagesize ()
 798 #    else
 799 #     if !GNULIB_defined_getpagesize_function
 800 static inline int
 801 getpagesize ()
 802 {
 803   return _gl_getpagesize ();
 804 }
 805 #      define GNULIB_defined_getpagesize_function 1
 806 #     endif
 807 #    endif
 808 #   endif
 809 #  endif
 810 /* Need to cast, because on Cygwin 1.5.x systems, the return type is size_t.  */
 811 _GL_CXXALIAS_SYS_CAST (getpagesize, int, (void));
 812 # endif
 813 # if @HAVE_DECL_GETPAGESIZE@
 814 _GL_CXXALIASWARN (getpagesize);
 815 # endif
 816 #elif defined GNULIB_POSIXCHECK
 817 # undef getpagesize
 818 # if HAVE_RAW_DECL_GETPAGESIZE
 819 _GL_WARN_ON_USE (getpagesize, "getpagesize is unportable - "
 820                  "use gnulib module getpagesize for portability");
 821 # endif
 822 #endif
 823
 824
 825 #if @GNULIB_GETUSERSHELL@
 826 /* Return the next valid login shell on the system, or NULL when the end of
 827    the list has been reached.  */
 828 # if !@HAVE_DECL_GETUSERSHELL@
 829 _GL_FUNCDECL_SYS (getusershell, char *, (void));
 830 # endif
 831 _GL_CXXALIAS_SYS (getusershell, char *, (void));
 832 _GL_CXXALIASWARN (getusershell);
 833 #elif defined GNULIB_POSIXCHECK
 834 # undef getusershell
 835 # if HAVE_RAW_DECL_GETUSERSHELL
 836 _GL_WARN_ON_USE (getusershell, "getusershell is unportable - "
 837                  "use gnulib module getusershell for portability");
 838 # endif
 839 #endif
 840
 841 #if @GNULIB_GETUSERSHELL@
 842 /* Rewind to pointer that is advanced at each getusershell() call.  */
 843 # if !@HAVE_DECL_GETUSERSHELL@
 844 _GL_FUNCDECL_SYS (setusershell, void, (void));
 845 # endif
 846 _GL_CXXALIAS_SYS (setusershell, void, (void));
 847 _GL_CXXALIASWARN (setusershell);
 848 #elif defined GNULIB_POSIXCHECK
 849 # undef setusershell
 850 # if HAVE_RAW_DECL_SETUSERSHELL
 851 _GL_WARN_ON_USE (setusershell, "setusershell is unportable - "
 852                  "use gnulib module getusershell for portability");
 853 # endif
 854 #endif
 855
 856 #if @GNULIB_GETUSERSHELL@
 857 /* Free the pointer that is advanced at each getusershell() call and
 858    associated resources.  */
 859 # if !@HAVE_DECL_GETUSERSHELL@
 860 _GL_FUNCDECL_SYS (endusershell, void, (void));
 861 # endif
 862 _GL_CXXALIAS_SYS (endusershell, void, (void));
 863 _GL_CXXALIASWARN (endusershell);
 864 #elif defined GNULIB_POSIXCHECK
 865 # undef endusershell
 866 # if HAVE_RAW_DECL_ENDUSERSHELL
 867 _GL_WARN_ON_USE (endusershell, "endusershell is unportable - "
 868                  "use gnulib module getusershell for portability");
 869 # endif
 870 #endif
 871
 872
 873 #if @GNULIB_LCHOWN@
 874 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
 875    to GID (if GID is not -1).  Do not follow symbolic links.
 876    Return 0 if successful, otherwise -1 and errno set.
 877    See the POSIX:2001 specification
 878    <http://www.opengroup.org/susv3xsh/lchown.html>.  */
 879 # if @REPLACE_LCHOWN@
 880 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 881 #   undef lchown
 882 #   define lchown rpl_lchown
 883 #  endif
 884 _GL_FUNCDECL_RPL (lchown, int, (char const *file, uid_t owner, gid_t group)
 885                                _GL_ARG_NONNULL ((1)));
 886 _GL_CXXALIAS_RPL (lchown, int, (char const *file, uid_t owner, gid_t group));
 887 # else
 888 #  if !@HAVE_LCHOWN@
 889 _GL_FUNCDECL_SYS (lchown, int, (char const *file, uid_t owner, gid_t group)
 890                                _GL_ARG_NONNULL ((1)));
 891 #  endif
 892 _GL_CXXALIAS_SYS (lchown, int, (char const *file, uid_t owner, gid_t group));
 893 # endif
 894 _GL_CXXALIASWARN (lchown);
 895 #elif defined GNULIB_POSIXCHECK
 896 # undef lchown
 897 # if HAVE_RAW_DECL_LCHOWN
 898 _GL_WARN_ON_USE (lchown, "lchown is unportable to pre-POSIX.1-2001 systems - "
 899                  "use gnulib module lchown for portability");
 900 # endif
 901 #endif
 902
 903
 904 #if @GNULIB_LINK@
 905 /* Create a new hard link for an existing file.
 906    Return 0 if successful, otherwise -1 and errno set.
 907    See POSIX:2001 specification
 908    <http://www.opengroup.org/susv3xsh/link.html>.  */
 909 # if @REPLACE_LINK@
 910 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 911 #   define link rpl_link
 912 #  endif
 913 _GL_FUNCDECL_RPL (link, int, (const char *path1, const char *path2)
 914                              _GL_ARG_NONNULL ((1, 2)));
 915 _GL_CXXALIAS_RPL (link, int, (const char *path1, const char *path2));
 916 # else
 917 #  if !@HAVE_LINK@
 918 _GL_FUNCDECL_SYS (link, int, (const char *path1, const char *path2)
 919                              _GL_ARG_NONNULL ((1, 2)));
 920 #  endif
 921 _GL_CXXALIAS_SYS (link, int, (const char *path1, const char *path2));
 922 # endif
 923 _GL_CXXALIASWARN (link);
 924 #elif defined GNULIB_POSIXCHECK
 925 # undef link
 926 # if HAVE_RAW_DECL_LINK
 927 _GL_WARN_ON_USE (link, "link is unportable - "
 928                  "use gnulib module link for portability");
 929 # endif
 930 #endif
 931
 932
 933 #if @GNULIB_LINKAT@
 934 /* Create a new hard link for an existing file, relative to two
 935    directories.  FLAG controls whether symlinks are followed.
 936    Return 0 if successful, otherwise -1 and errno set.  */
 937 # if @REPLACE_LINKAT@
 938 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 939 #   undef linkat
 940 #   define linkat rpl_linkat
 941 #  endif
 942 _GL_FUNCDECL_RPL (linkat, int,
 943                   (int fd1, const char *path1, int fd2, const char *path2,
 944                    int flag)
 945                   _GL_ARG_NONNULL ((2, 4)));
 946 _GL_CXXALIAS_RPL (linkat, int,
 947                   (int fd1, const char *path1, int fd2, const char *path2,
 948                    int flag));
 949 # else
 950 #  if !@HAVE_LINKAT@
 951 _GL_FUNCDECL_SYS (linkat, int,
 952                   (int fd1, const char *path1, int fd2, const char *path2,
 953                    int flag)
 954                   _GL_ARG_NONNULL ((2, 4)));
 955 #  endif
 956 _GL_CXXALIAS_SYS (linkat, int,
 957                   (int fd1, const char *path1, int fd2, const char *path2,
 958                    int flag));
 959 # endif
 960 _GL_CXXALIASWARN (linkat);
 961 #elif defined GNULIB_POSIXCHECK
 962 # undef linkat
 963 # if HAVE_RAW_DECL_LINKAT
 964 _GL_WARN_ON_USE (linkat, "linkat is unportable - "
 965                  "use gnulib module linkat for portability");
 966 # endif
 967 #endif
 968
 969
 970 #if @GNULIB_LSEEK@
 971 /* Set the offset of FD relative to SEEK_SET, SEEK_CUR, or SEEK_END.
 972    Return the new offset if successful, otherwise -1 and errno set.
 973    See the POSIX:2001 specification
 974    <http://www.opengroup.org/susv3xsh/lseek.html>.  */
 975 # if @REPLACE_LSEEK@
 976 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 977 #   define lseek rpl_lseek
 978 #  endif
 979 _GL_FUNCDECL_RPL (lseek, off_t, (int fd, off_t offset, int whence));
 980 _GL_CXXALIAS_RPL (lseek, off_t, (int fd, off_t offset, int whence));
 981 # else
 982 _GL_CXXALIAS_SYS (lseek, off_t, (int fd, off_t offset, int whence));
 983 # endif
 984 _GL_CXXALIASWARN (lseek);
 985 #elif defined GNULIB_POSIXCHECK
 986 # undef lseek
 987 # if HAVE_RAW_DECL_LSEEK
 988 _GL_WARN_ON_USE (lseek, "lseek does not fail with ESPIPE on pipes on some "
 989                  "systems - use gnulib module lseek for portability");
 990 # endif
 991 #endif
 992
 993
 994 #if @GNULIB_PIPE@
 995 /* Create a pipe, defaulting to O_BINARY mode.
 996    Store the read-end as fd[0] and the write-end as fd[1].
 997    Return 0 upon success, or -1 with errno set upon failure.  */
 998 # if !@HAVE_PIPE@
 999 _GL_FUNCDECL_SYS (pipe, int, (int fd[2]) _GL_ARG_NONNULL ((1)));
1000 # endif
1001 _GL_CXXALIAS_SYS (pipe, int, (int fd[2]));
1002 _GL_CXXALIASWARN (pipe);
1003 #elif defined GNULIB_POSIXCHECK
1004 # undef pipe
1005 # if HAVE_RAW_DECL_PIPE
1006 _GL_WARN_ON_USE (pipe, "pipe is unportable - "
1007                  "use gnulib module pipe-posix for portability");
1008 # endif
1009 #endif
1010
1011
1012 #if @GNULIB_PIPE2@
1013 /* Create a pipe, applying the given flags when opening the read-end of the
1014    pipe and the write-end of the pipe.
1015    The flags are a bitmask, possibly including O_CLOEXEC (defined in <fcntl.h>)
1016    and O_TEXT, O_BINARY (defined in "binary-io.h").
1017    Store the read-end as fd[0] and the write-end as fd[1].
1018    Return 0 upon success, or -1 with errno set upon failure.
1019    See also the Linux man page at
1020    <http://www.kernel.org/doc/man-pages/online/pages/man2/pipe2.2.html>.  */
1021 # if @HAVE_PIPE2@
1022 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1023 #   define pipe2 rpl_pipe2
1024 #  endif
1025 _GL_FUNCDECL_RPL (pipe2, int, (int fd[2], int flags) _GL_ARG_NONNULL ((1)));
1026 _GL_CXXALIAS_RPL (pipe2, int, (int fd[2], int flags));
1027 # else
1028 _GL_FUNCDECL_SYS (pipe2, int, (int fd[2], int flags) _GL_ARG_NONNULL ((1)));
1029 _GL_CXXALIAS_SYS (pipe2, int, (int fd[2], int flags));
1030 # endif
1031 _GL_CXXALIASWARN (pipe2);
1032 #elif defined GNULIB_POSIXCHECK
1033 # undef pipe2
1034 # if HAVE_RAW_DECL_PIPE2
1035 _GL_WARN_ON_USE (pipe2, "pipe2 is unportable - "
1036                  "use gnulib module pipe2 for portability");
1037 # endif
1038 #endif
1039
1040
1041 #if @GNULIB_PREAD@
1042 /* Read at most BUFSIZE bytes from FD into BUF, starting at OFFSET.
1043    Return the number of bytes placed into BUF if successful, otherwise
1044    set errno and return -1.  0 indicates EOF.  See the POSIX:2001
1045    specification <http://www.opengroup.org/susv3xsh/pread.html>.  */
1046 # if @REPLACE_PREAD@
1047 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1048 #   define pread rpl_pread
1049 #  endif
1050 _GL_FUNCDECL_RPL (pread, ssize_t,
1051                   (int fd, void *buf, size_t bufsize, off_t offset)
1052                   _GL_ARG_NONNULL ((2)));
1053 _GL_CXXALIAS_RPL (pread, ssize_t,
1054                   (int fd, void *buf, size_t bufsize, off_t offset));
1055 # else
1056 #  if !@HAVE_PREAD@
1057 _GL_FUNCDECL_SYS (pread, ssize_t,
1058                   (int fd, void *buf, size_t bufsize, off_t offset)
1059                   _GL_ARG_NONNULL ((2)));
1060 #  endif
1061 _GL_CXXALIAS_SYS (pread, ssize_t,
1062                   (int fd, void *buf, size_t bufsize, off_t offset));
1063 # endif
1064 _GL_CXXALIASWARN (pread);
1065 #elif defined GNULIB_POSIXCHECK
1066 # undef pread
1067 # if HAVE_RAW_DECL_PREAD
1068 _GL_WARN_ON_USE (pread, "pread is unportable - "
1069                  "use gnulib module pread for portability");
1070 # endif
1071 #endif
1072
1073
1074 #if @GNULIB_PWRITE@
1075 /* Write at most BUFSIZE bytes from BUF into FD, starting at OFFSET.
1076    Return the number of bytes written if successful, otherwise
1077    set errno and return -1.  0 indicates nothing written.  See the
1078    POSIX:2001 specification
1079    <http://www.opengroup.org/susv3xsh/pwrite.html>.  */
1080 # if @REPLACE_PWRITE@
1081 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1082 #   define pwrite rpl_pwrite
1083 #  endif
1084 _GL_FUNCDECL_RPL (pwrite, ssize_t,
1085                   (int fd, const void *buf, size_t bufsize, off_t offset)
1086                   _GL_ARG_NONNULL ((2)));
1087 _GL_CXXALIAS_RPL (pwrite, ssize_t,
1088                   (int fd, const void *buf, size_t bufsize, off_t offset));
1089 # else
1090 #  if !@HAVE_PWRITE@
1091 _GL_FUNCDECL_SYS (pwrite, ssize_t,
1092                   (int fd, const void *buf, size_t bufsize, off_t offset)
1093                   _GL_ARG_NONNULL ((2)));
1094 #  endif
1095 _GL_CXXALIAS_SYS (pwrite, ssize_t,
1096                   (int fd, const void *buf, size_t bufsize, off_t offset));
1097 # endif
1098 _GL_CXXALIASWARN (pwrite);
1099 #elif defined GNULIB_POSIXCHECK
1100 # undef pwrite
1101 # if HAVE_RAW_DECL_PWRITE
1102 _GL_WARN_ON_USE (pwrite, "pwrite is unportable - "
1103                  "use gnulib module pwrite for portability");
1104 # endif
1105 #endif
1106
1107
1108 #if @GNULIB_READLINK@
1109 /* Read the contents of the symbolic link FILE and place the first BUFSIZE
1110    bytes of it into BUF.  Return the number of bytes placed into BUF if
1111    successful, otherwise -1 and errno set.
1112    See the POSIX:2001 specification
1113    <http://www.opengroup.org/susv3xsh/readlink.html>.  */
1114 # if @REPLACE_READLINK@
1115 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1116 #   define readlink rpl_readlink
1117 #  endif
1118 _GL_FUNCDECL_RPL (readlink, ssize_t,
1119                   (const char *file, char *buf, size_t bufsize)
1120                   _GL_ARG_NONNULL ((1, 2)));
1121 _GL_CXXALIAS_RPL (readlink, ssize_t,
1122                   (const char *file, char *buf, size_t bufsize));
1123 # else
1124 #  if !@HAVE_READLINK@
1125 _GL_FUNCDECL_SYS (readlink, ssize_t,
1126                   (const char *file, char *buf, size_t bufsize)
1127                   _GL_ARG_NONNULL ((1, 2)));
1128 #  endif
1129 _GL_CXXALIAS_SYS (readlink, ssize_t,
1130                   (const char *file, char *buf, size_t bufsize));
1131 # endif
1132 _GL_CXXALIASWARN (readlink);
1133 #elif defined GNULIB_POSIXCHECK
1134 # undef readlink
1135 # if HAVE_RAW_DECL_READLINK
1136 _GL_WARN_ON_USE (readlink, "readlink is unportable - "
1137                  "use gnulib module readlink for portability");
1138 # endif
1139 #endif
1140
1141
1142 #if @GNULIB_READLINKAT@
1143 # if !@HAVE_READLINKAT@
1144 _GL_FUNCDECL_SYS (readlinkat, ssize_t,
1145                   (int fd, char const *file, char *buf, size_t len)
1146                   _GL_ARG_NONNULL ((2, 3)));
1147 # endif
1148 _GL_CXXALIAS_SYS (readlinkat, ssize_t,
1149                   (int fd, char const *file, char *buf, size_t len));
1150 _GL_CXXALIASWARN (readlinkat);
1151 #elif defined GNULIB_POSIXCHECK
1152 # undef readlinkat
1153 # if HAVE_RAW_DECL_READLINKAT
1154 _GL_WARN_ON_USE (readlinkat, "readlinkat is not portable - "
1155                  "use gnulib module readlinkat for portability");
1156 # endif
1157 #endif
1158
1159
1160 #if @GNULIB_RMDIR@
1161 /* Remove the directory DIR.  */
1162 # if @REPLACE_RMDIR@
1163 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1164 #   define rmdir rpl_rmdir
1165 #  endif
1166 _GL_FUNCDECL_RPL (rmdir, int, (char const *name) _GL_ARG_NONNULL ((1)));
1167 _GL_CXXALIAS_RPL (rmdir, int, (char const *name));
1168 # else
1169 _GL_CXXALIAS_SYS (rmdir, int, (char const *name));
1170 # endif
1171 _GL_CXXALIASWARN (rmdir);
1172 #elif defined GNULIB_POSIXCHECK
1173 # undef rmdir
1174 # if HAVE_RAW_DECL_RMDIR
1175 _GL_WARN_ON_USE (rmdir, "rmdir is unportable - "
1176                  "use gnulib module rmdir for portability");
1177 # endif
1178 #endif
1179
1180
1181 #if @GNULIB_SLEEP@
1182 /* Pause the execution of the current thread for N seconds.
1183    Returns the number of seconds left to sleep.
1184    See the POSIX:2001 specification
1185    <http://www.opengroup.org/susv3xsh/sleep.html>.  */
1186 # if @REPLACE_SLEEP@
1187 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1188 #   undef sleep
1189 #   define sleep rpl_sleep
1190 #  endif
1191 _GL_FUNCDECL_RPL (sleep, unsigned int, (unsigned int n));
1192 _GL_CXXALIAS_RPL (sleep, unsigned int, (unsigned int n));
1193 # else
1194 #  if !@HAVE_SLEEP@
1195 _GL_FUNCDECL_SYS (sleep, unsigned int, (unsigned int n));
1196 #  endif
1197 _GL_CXXALIAS_SYS (sleep, unsigned int, (unsigned int n));
1198 # endif
1199 _GL_CXXALIASWARN (sleep);
1200 #elif defined GNULIB_POSIXCHECK
1201 # undef sleep
1202 # if HAVE_RAW_DECL_SLEEP
1203 _GL_WARN_ON_USE (sleep, "sleep is unportable - "
1204                  "use gnulib module sleep for portability");
1205 # endif
1206 #endif
1207
1208
1209 #if @GNULIB_SYMLINK@
1210 # if @REPLACE_SYMLINK@
1211 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1212 #   undef symlink
1213 #   define symlink rpl_symlink
1214 #  endif
1215 _GL_FUNCDECL_RPL (symlink, int, (char const *contents, char const *file)
1216                                 _GL_ARG_NONNULL ((1, 2)));
1217 _GL_CXXALIAS_RPL (symlink, int, (char const *contents, char const *file));
1218 # else
1219 #  if !@HAVE_SYMLINK@
1220 _GL_FUNCDECL_SYS (symlink, int, (char const *contents, char const *file)
1221                                 _GL_ARG_NONNULL ((1, 2)));
1222 #  endif
1223 _GL_CXXALIAS_SYS (symlink, int, (char const *contents, char const *file));
1224 # endif
1225 _GL_CXXALIASWARN (symlink);
1226 #elif defined GNULIB_POSIXCHECK
1227 # undef symlink
1228 # if HAVE_RAW_DECL_SYMLINK
1229 _GL_WARN_ON_USE (symlink, "symlink is not portable - "
1230                  "use gnulib module symlink for portability");
1231 # endif
1232 #endif
1233
1234
1235 #if @GNULIB_SYMLINKAT@
1236 # if !@HAVE_SYMLINKAT@
1237 _GL_FUNCDECL_SYS (symlinkat, int,
1238                   (char const *contents, int fd, char const *file)
1239                   _GL_ARG_NONNULL ((1, 3)));
1240 # endif
1241 _GL_CXXALIAS_SYS (symlinkat, int,
1242                   (char const *contents, int fd, char const *file));
1243 _GL_CXXALIASWARN (symlinkat);
1244 #elif defined GNULIB_POSIXCHECK
1245 # undef symlinkat
1246 # if HAVE_RAW_DECL_SYMLINKAT
1247 _GL_WARN_ON_USE (symlinkat, "symlinkat is not portable - "
1248                  "use gnulib module symlinkat for portability");
1249 # endif
1250 #endif
1251
1252
1253 #if @GNULIB_TTYNAME_R@
1254 /* Store at most BUFLEN characters of the pathname of the terminal FD is
1255    open on in BUF.  Return 0 on success, otherwise an error number.  */
1256 # if @REPLACE_TTYNAME_R@
1257 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1258 #   undef ttyname_r
1259 #   define ttyname_r rpl_ttyname_r
1260 #  endif
1261 _GL_FUNCDECL_RPL (ttyname_r, int,
1262                   (int fd, char *buf, size_t buflen) _GL_ARG_NONNULL ((2)));
1263 _GL_CXXALIAS_RPL (ttyname_r, int,
1264                   (int fd, char *buf, size_t buflen));
1265 # else
1266 #  if !@HAVE_DECL_TTYNAME_R@
1267 _GL_FUNCDECL_SYS (ttyname_r, int,
1268                   (int fd, char *buf, size_t buflen) _GL_ARG_NONNULL ((2)));
1269 #  endif
1270 _GL_CXXALIAS_SYS (ttyname_r, int,
1271                   (int fd, char *buf, size_t buflen));
1272 # endif
1273 _GL_CXXALIASWARN (ttyname_r);
1274 #elif defined GNULIB_POSIXCHECK
1275 # undef ttyname_r
1276 # if HAVE_RAW_DECL_TTYNAME_R
1277 _GL_WARN_ON_USE (ttyname_r, "ttyname_r is not portable - "
1278                  "use gnulib module ttyname_r for portability");
1279 # endif
1280 #endif
1281
1282
1283 #if @GNULIB_UNLINK@
1284 # if @REPLACE_UNLINK@
1285 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1286 #   undef unlink
1287 #   define unlink rpl_unlink
1288 #  endif
1289 _GL_FUNCDECL_RPL (unlink, int, (char const *file) _GL_ARG_NONNULL ((1)));
1290 _GL_CXXALIAS_RPL (unlink, int, (char const *file));
1291 # else
1292 _GL_CXXALIAS_SYS (unlink, int, (char const *file));
1293 # endif
1294 _GL_CXXALIASWARN (unlink);
1295 #elif defined GNULIB_POSIXCHECK
1296 # undef unlink
1297 # if HAVE_RAW_DECL_UNLINK
1298 _GL_WARN_ON_USE (unlink, "unlink is not portable - "
1299                  "use gnulib module unlink for portability");
1300 # endif
1301 #endif
1302
1303
1304 #if @GNULIB_UNLINKAT@
1305 # if @REPLACE_UNLINKAT@
1306 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1307 #   undef unlinkat
1308 #   define unlinkat rpl_unlinkat
1309 #  endif
1310 _GL_FUNCDECL_RPL (unlinkat, int, (int fd, char const *file, int flag)
1311                                  _GL_ARG_NONNULL ((2)));
1312 _GL_CXXALIAS_RPL (unlinkat, int, (int fd, char const *file, int flag));
1313 # else
1314 #  if !@HAVE_UNLINKAT@
1315 _GL_FUNCDECL_SYS (unlinkat, int, (int fd, char const *file, int flag)
1316                                  _GL_ARG_NONNULL ((2)));
1317 #  endif
1318 _GL_CXXALIAS_SYS (unlinkat, int, (int fd, char const *file, int flag));
1319 # endif
1320 _GL_CXXALIASWARN (unlinkat);
1321 #elif defined GNULIB_POSIXCHECK
1322 # undef unlinkat
1323 # if HAVE_RAW_DECL_UNLINKAT
1324 _GL_WARN_ON_USE (unlinkat, "unlinkat is not portable - "
1325                  "use gnulib module openat for portability");
1326 # endif
1327 #endif
1328
1329
1330 #if @GNULIB_USLEEP@
1331 /* Pause the execution of the current thread for N microseconds.
1332    Returns 0 on completion, or -1 on range error.
1333    See the POSIX:2001 specification
1334    <http://www.opengroup.org/susv3xsh/sleep.html>.  */
1335 # if @REPLACE_USLEEP@
1336 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1337 #   undef usleep
1338 #   define usleep rpl_usleep
1339 #  endif
1340 _GL_FUNCDECL_RPL (usleep, int, (useconds_t n));
1341 _GL_CXXALIAS_RPL (usleep, int, (useconds_t n));
1342 # else
1343 #  if !@HAVE_USLEEP@
1344 _GL_FUNCDECL_SYS (usleep, int, (useconds_t n));
1345 #  endif
1346 _GL_CXXALIAS_SYS (usleep, int, (useconds_t n));
1347 # endif
1348 _GL_CXXALIASWARN (usleep);
1349 #elif defined GNULIB_POSIXCHECK
1350 # undef usleep
1351 # if HAVE_RAW_DECL_USLEEP
1352 _GL_WARN_ON_USE (usleep, "usleep is unportable - "
1353                  "use gnulib module usleep for portability");
1354 # endif
1355 #endif
1356
1357
1358 #if @GNULIB_WRITE@
1359 /* Write up to COUNT bytes starting at BUF to file descriptor FD.
1360    See the POSIX:2001 specification
1361    <http://www.opengroup.org/susv3xsh/write.html>.  */
1362 # if @REPLACE_WRITE@ && @GNULIB_UNISTD_H_SIGPIPE@
1363 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1364 #   undef write
1365 #   define write rpl_write
1366 #  endif
1367 _GL_FUNCDECL_RPL (write, ssize_t, (int fd, const void *buf, size_t count)
1368                                   _GL_ARG_NONNULL ((2)));
1369 _GL_CXXALIAS_RPL (write, ssize_t, (int fd, const void *buf, size_t count));
1370 # else
1371 /* Need to cast, because on mingw, the third parameter is
1372                                                              unsigned int count
1373    and the return type is 'int'.  */
1374 _GL_CXXALIAS_SYS_CAST (write, ssize_t, (int fd, const void *buf, size_t count));
1375 # endif
1376 _GL_CXXALIASWARN (write);
1377 #endif
1378
1379
1380 #endif /* _GL_UNISTD_H */
1381 #endif /* _GL_UNISTD_H */