lib/unistd.in.h

   1 /* Substitute for and wrapper around <unistd.h>.
   2    Copyright (C) 2003-2013 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, see <http://www.gnu.org/licenses/>.  */
  16
  17 #if __GNUC__ >= 3
  18 @PRAGMA_SYSTEM_HEADER@
  19 #endif
  20 @PRAGMA_COLUMNS@
  21
  22 /* Special invocation convention:
  23    - On mingw, several headers, including <winsock2.h>, include <unistd.h>,
  24      but we need to ensure that both the system <unistd.h> and <winsock2.h>
  25      are completely included before we replace gethostname.  */
  26 #if @GNULIB_GETHOSTNAME@ && @UNISTD_H_HAVE_WINSOCK2_H@ \
  27   && !defined _GL_WINSOCK2_H_WITNESS && defined _WINSOCK2_H
  28 /* <unistd.h> is being indirectly included for the first time from
  29    <winsock2.h>; avoid declaring any overrides.  */
  30 # if @HAVE_UNISTD_H@
  31 #  @INCLUDE_NEXT@ @NEXT_UNISTD_H@
  32 # else
  33 #  error unexpected; report this to bug-gnulib@gnu.org
  34 # endif
  35 # define _GL_WINSOCK2_H_WITNESS
  36
  37 /* Normal invocation.  */
  38 #elif !defined _@GUARD_PREFIX@_UNISTD_H
  39
  40 /* The include_next requires a split double-inclusion guard.  */
  41 #if @HAVE_UNISTD_H@
  42 # @INCLUDE_NEXT@ @NEXT_UNISTD_H@
  43 #endif
  44
  45 /* Get all possible declarations of gethostname().  */
  46 #if @GNULIB_GETHOSTNAME@ && @UNISTD_H_HAVE_WINSOCK2_H@ \
  47   && !defined _GL_INCLUDING_WINSOCK2_H
  48 # define _GL_INCLUDING_WINSOCK2_H
  49 # include <winsock2.h>
  50 # undef _GL_INCLUDING_WINSOCK2_H
  51 #endif
  52
  53 #if !defined _@GUARD_PREFIX@_UNISTD_H && !defined _GL_INCLUDING_WINSOCK2_H
  54 #define _@GUARD_PREFIX@_UNISTD_H
  55
  56 /* NetBSD 5.0 mis-defines NULL.  Also get size_t.  */
  57 #include <stddef.h>
  58
  59 /* mingw doesn't define the SEEK_* or *_FILENO macros in <unistd.h>.  */
  60 /* Cygwin 1.7.1 declares symlinkat in <stdio.h>, not in <unistd.h>.  */
  61 /* But avoid namespace pollution on glibc systems.  */
  62 #if (!(defined SEEK_CUR && defined SEEK_END && defined SEEK_SET) \
  63      || ((@GNULIB_SYMLINKAT@ || defined GNULIB_POSIXCHECK) \
  64          && defined __CYGWIN__)) \
  65     && ! defined __GLIBC__
  66 # include <stdio.h>
  67 #endif
  68
  69 /* Cygwin 1.7.1 declares unlinkat in <fcntl.h>, not in <unistd.h>.  */
  70 /* But avoid namespace pollution on glibc systems.  */
  71 #if (@GNULIB_UNLINKAT@ || defined GNULIB_POSIXCHECK) && defined __CYGWIN__ \
  72     && ! defined __GLIBC__
  73 # include <fcntl.h>
  74 #endif
  75
  76 /* mingw fails to declare _exit in <unistd.h>.  */
  77 /* mingw, MSVC, BeOS, Haiku declare environ in <stdlib.h>, not in
  78    <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 /* Native Windows platforms declare chdir, getcwd, rmdir in
  86    <io.h> and/or <direct.h>, not in <unistd.h>.
  87    They also declare access(), chmod(), close(), dup(), dup2(), isatty(),
  88    lseek(), read(), unlink(), write() in <io.h>.  */
  89 #if ((@GNULIB_CHDIR@ || @GNULIB_GETCWD@ || @GNULIB_RMDIR@ \
  90       || defined GNULIB_POSIXCHECK) \
  91      && ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
  92 # include <io.h>     /* mingw32, mingw64 */
  93 # include <direct.h> /* mingw64, MSVC 9 */
  94 #elif (@GNULIB_CLOSE@ || @GNULIB_DUP@ || @GNULIB_DUP2@ || @GNULIB_ISATTY@ \
  95        || @GNULIB_LSEEK@ || @GNULIB_READ@ || @GNULIB_UNLINK@ || @GNULIB_WRITE@ \
  96        || defined GNULIB_POSIXCHECK) \
  97       && ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__)
  98 # include <io.h>
  99 #endif
 100
 101 /* AIX and OSF/1 5.1 declare getdomainname in <netdb.h>, not in <unistd.h>.
 102    NonStop Kernel declares gethostname in <netdb.h>, not in <unistd.h>.  */
 103 /* But avoid namespace pollution on glibc systems.  */
 104 #if ((@GNULIB_GETDOMAINNAME@ && (defined _AIX || defined __osf__)) \
 105      || (@GNULIB_GETHOSTNAME@ && defined __TANDEM)) \
 106     && !defined __GLIBC__
 107 # include <netdb.h>
 108 #endif
 109
 110 /* MSVC defines off_t in <sys/types.h>.
 111    May also define off_t to a 64-bit type on native Windows.  */
 112 #if !@HAVE_UNISTD_H@ || @WINDOWS_64_BIT_OFF_T@
 113 /* Get off_t.  */
 114 # include <sys/types.h>
 115 #endif
 116
 117 #if (@GNULIB_READ@ || @GNULIB_WRITE@ \
 118      || @GNULIB_READLINK@ || @GNULIB_READLINKAT@ \
 119      || @GNULIB_PREAD@ || @GNULIB_PWRITE@ || defined GNULIB_POSIXCHECK)
 120 /* Get ssize_t.  */
 121 # include <sys/types.h>
 122 #endif
 123
 124 /* Get getopt(), optarg, optind, opterr, optopt.
 125    But avoid namespace pollution on glibc systems.  */
 126 #if @GNULIB_UNISTD_H_GETOPT@ && !defined __GLIBC__ && !defined _GL_SYSTEM_GETOPT
 127 # include <getopt.h>
 128 #endif
 129
 130 _GL_INLINE_HEADER_BEGIN
 131 #ifndef _GL_UNISTD_INLINE
 132 # define _GL_UNISTD_INLINE _GL_INLINE
 133 #endif
 134
 135 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
 136
 137 /* The definition of _GL_ARG_NONNULL is copied here.  */
 138
 139 /* The definition of _GL_WARN_ON_USE is copied here.  */
 140
 141
 142 /* Hide some function declarations from <winsock2.h>.  */
 143
 144 #if @GNULIB_GETHOSTNAME@ && @UNISTD_H_HAVE_WINSOCK2_H@
 145 # if !defined _@GUARD_PREFIX@_SYS_SOCKET_H
 146 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 147 #   undef socket
 148 #   define socket              socket_used_without_including_sys_socket_h
 149 #   undef connect
 150 #   define connect             connect_used_without_including_sys_socket_h
 151 #   undef accept
 152 #   define accept              accept_used_without_including_sys_socket_h
 153 #   undef bind
 154 #   define bind                bind_used_without_including_sys_socket_h
 155 #   undef getpeername
 156 #   define getpeername         getpeername_used_without_including_sys_socket_h
 157 #   undef getsockname
 158 #   define getsockname         getsockname_used_without_including_sys_socket_h
 159 #   undef getsockopt
 160 #   define getsockopt          getsockopt_used_without_including_sys_socket_h
 161 #   undef listen
 162 #   define listen              listen_used_without_including_sys_socket_h
 163 #   undef recv
 164 #   define recv                recv_used_without_including_sys_socket_h
 165 #   undef send
 166 #   define send                send_used_without_including_sys_socket_h
 167 #   undef recvfrom
 168 #   define recvfrom            recvfrom_used_without_including_sys_socket_h
 169 #   undef sendto
 170 #   define sendto              sendto_used_without_including_sys_socket_h
 171 #   undef setsockopt
 172 #   define setsockopt          setsockopt_used_without_including_sys_socket_h
 173 #   undef shutdown
 174 #   define shutdown            shutdown_used_without_including_sys_socket_h
 175 #  else
 176     _GL_WARN_ON_USE (socket,
 177                      "socket() used without including <sys/socket.h>");
 178     _GL_WARN_ON_USE (connect,
 179                      "connect() used without including <sys/socket.h>");
 180     _GL_WARN_ON_USE (accept,
 181                      "accept() used without including <sys/socket.h>");
 182     _GL_WARN_ON_USE (bind,
 183                      "bind() used without including <sys/socket.h>");
 184     _GL_WARN_ON_USE (getpeername,
 185                      "getpeername() used without including <sys/socket.h>");
 186     _GL_WARN_ON_USE (getsockname,
 187                      "getsockname() used without including <sys/socket.h>");
 188     _GL_WARN_ON_USE (getsockopt,
 189                      "getsockopt() used without including <sys/socket.h>");
 190     _GL_WARN_ON_USE (listen,
 191                      "listen() used without including <sys/socket.h>");
 192     _GL_WARN_ON_USE (recv,
 193                      "recv() used without including <sys/socket.h>");
 194     _GL_WARN_ON_USE (send,
 195                      "send() used without including <sys/socket.h>");
 196     _GL_WARN_ON_USE (recvfrom,
 197                      "recvfrom() used without including <sys/socket.h>");
 198     _GL_WARN_ON_USE (sendto,
 199                      "sendto() used without including <sys/socket.h>");
 200     _GL_WARN_ON_USE (setsockopt,
 201                      "setsockopt() used without including <sys/socket.h>");
 202     _GL_WARN_ON_USE (shutdown,
 203                      "shutdown() used without including <sys/socket.h>");
 204 #  endif
 205 # endif
 206 # if !defined _@GUARD_PREFIX@_SYS_SELECT_H
 207 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 208 #   undef select
 209 #   define select              select_used_without_including_sys_select_h
 210 #  else
 211     _GL_WARN_ON_USE (select,
 212                      "select() used without including <sys/select.h>");
 213 #  endif
 214 # endif
 215 #endif
 216
 217
 218 /* OS/2 EMX lacks these macros.  */
 219 #ifndef STDIN_FILENO
 220 # define STDIN_FILENO 0
 221 #endif
 222 #ifndef STDOUT_FILENO
 223 # define STDOUT_FILENO 1
 224 #endif
 225 #ifndef STDERR_FILENO
 226 # define STDERR_FILENO 2
 227 #endif
 228
 229 /* Ensure *_OK macros exist.  */
 230 #ifndef F_OK
 231 # define F_OK 0
 232 # define X_OK 1
 233 # define W_OK 2
 234 # define R_OK 4
 235 #endif
 236
 237
 238 /* Declare overridden functions.  */
 239
 240
 241 #if defined GNULIB_POSIXCHECK
 242 /* The access() function is a security risk.  */
 243 _GL_WARN_ON_USE (access, "the access function is a security risk - "
 244                  "use the gnulib module faccessat instead");
 245 #endif
 246
 247
 248 #if @GNULIB_CHDIR@
 249 _GL_CXXALIAS_SYS (chdir, int, (const char *file) _GL_ARG_NONNULL ((1)));
 250 _GL_CXXALIASWARN (chdir);
 251 #elif defined GNULIB_POSIXCHECK
 252 # undef chdir
 253 # if HAVE_RAW_DECL_CHDIR
 254 _GL_WARN_ON_USE (chown, "chdir is not always in <unistd.h> - "
 255                  "use gnulib module chdir for portability");
 256 # endif
 257 #endif
 258
 259
 260 #if @GNULIB_CHOWN@
 261 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
 262    to GID (if GID is not -1).  Follow symbolic links.
 263    Return 0 if successful, otherwise -1 and errno set.
 264    See the POSIX:2008 specification
 265    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/chown.html.  */
 266 # if @REPLACE_CHOWN@
 267 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 268 #   undef chown
 269 #   define chown rpl_chown
 270 #  endif
 271 _GL_FUNCDECL_RPL (chown, int, (const char *file, uid_t uid, gid_t gid)
 272                               _GL_ARG_NONNULL ((1)));
 273 _GL_CXXALIAS_RPL (chown, int, (const char *file, uid_t uid, gid_t gid));
 274 # else
 275 #  if !@HAVE_CHOWN@
 276 _GL_FUNCDECL_SYS (chown, int, (const char *file, uid_t uid, gid_t gid)
 277                               _GL_ARG_NONNULL ((1)));
 278 #  endif
 279 _GL_CXXALIAS_SYS (chown, int, (const char *file, uid_t uid, gid_t gid));
 280 # endif
 281 _GL_CXXALIASWARN (chown);
 282 #elif defined GNULIB_POSIXCHECK
 283 # undef chown
 284 # if HAVE_RAW_DECL_CHOWN
 285 _GL_WARN_ON_USE (chown, "chown fails to follow symlinks on some systems and "
 286                  "doesn't treat a uid or gid of -1 on some systems - "
 287                  "use gnulib module chown for portability");
 288 # endif
 289 #endif
 290
 291
 292 #if @GNULIB_CLOSE@
 293 # if @REPLACE_CLOSE@
 294 /* Automatically included by modules that need a replacement for close.  */
 295 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 296 #   undef close
 297 #   define close rpl_close
 298 #  endif
 299 _GL_FUNCDECL_RPL (close, int, (int fd));
 300 _GL_CXXALIAS_RPL (close, int, (int fd));
 301 # else
 302 _GL_CXXALIAS_SYS (close, int, (int fd));
 303 # endif
 304 _GL_CXXALIASWARN (close);
 305 #elif @UNISTD_H_HAVE_WINSOCK2_H_AND_USE_SOCKETS@
 306 # undef close
 307 # define close close_used_without_requesting_gnulib_module_close
 308 #elif defined GNULIB_POSIXCHECK
 309 # undef close
 310 /* Assume close is always declared.  */
 311 _GL_WARN_ON_USE (close, "close does not portably work on sockets - "
 312                  "use gnulib module close for portability");
 313 #endif
 314
 315
 316 #if @GNULIB_DUP@
 317 # if @REPLACE_DUP@
 318 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 319 #   define dup rpl_dup
 320 #  endif
 321 _GL_FUNCDECL_RPL (dup, int, (int oldfd));
 322 _GL_CXXALIAS_RPL (dup, int, (int oldfd));
 323 # else
 324 _GL_CXXALIAS_SYS (dup, int, (int oldfd));
 325 # endif
 326 _GL_CXXALIASWARN (dup);
 327 #elif defined GNULIB_POSIXCHECK
 328 # undef dup
 329 # if HAVE_RAW_DECL_DUP
 330 _GL_WARN_ON_USE (dup, "dup is unportable - "
 331                  "use gnulib module dup for portability");
 332 # endif
 333 #endif
 334
 335
 336 #if @GNULIB_DUP2@
 337 /* Copy the file descriptor OLDFD into file descriptor NEWFD.  Do nothing if
 338    NEWFD = OLDFD, otherwise close NEWFD first if it is open.
 339    Return newfd if successful, otherwise -1 and errno set.
 340    See the POSIX:2008 specification
 341    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/dup2.html>.  */
 342 # if @REPLACE_DUP2@
 343 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 344 #   define dup2 rpl_dup2
 345 #  endif
 346 _GL_FUNCDECL_RPL (dup2, int, (int oldfd, int newfd));
 347 _GL_CXXALIAS_RPL (dup2, int, (int oldfd, int newfd));
 348 # else
 349 #  if !@HAVE_DUP2@
 350 _GL_FUNCDECL_SYS (dup2, int, (int oldfd, int newfd));
 351 #  endif
 352 _GL_CXXALIAS_SYS (dup2, int, (int oldfd, int newfd));
 353 # endif
 354 _GL_CXXALIASWARN (dup2);
 355 #elif defined GNULIB_POSIXCHECK
 356 # undef dup2
 357 # if HAVE_RAW_DECL_DUP2
 358 _GL_WARN_ON_USE (dup2, "dup2 is unportable - "
 359                  "use gnulib module dup2 for portability");
 360 # endif
 361 #endif
 362
 363
 364 #if @GNULIB_DUP3@
 365 /* Copy the file descriptor OLDFD into file descriptor NEWFD, with the
 366    specified flags.
 367    The flags are a bitmask, possibly including O_CLOEXEC (defined in <fcntl.h>)
 368    and O_TEXT, O_BINARY (defined in "binary-io.h").
 369    Close NEWFD first if it is open.
 370    Return newfd if successful, otherwise -1 and errno set.
 371    See the Linux man page at
 372    <http://www.kernel.org/doc/man-pages/online/pages/man2/dup3.2.html>.  */
 373 # if @HAVE_DUP3@
 374 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 375 #   define dup3 rpl_dup3
 376 #  endif
 377 _GL_FUNCDECL_RPL (dup3, int, (int oldfd, int newfd, int flags));
 378 _GL_CXXALIAS_RPL (dup3, int, (int oldfd, int newfd, int flags));
 379 # else
 380 _GL_FUNCDECL_SYS (dup3, int, (int oldfd, int newfd, int flags));
 381 _GL_CXXALIAS_SYS (dup3, int, (int oldfd, int newfd, int flags));
 382 # endif
 383 _GL_CXXALIASWARN (dup3);
 384 #elif defined GNULIB_POSIXCHECK
 385 # undef dup3
 386 # if HAVE_RAW_DECL_DUP3
 387 _GL_WARN_ON_USE (dup3, "dup3 is unportable - "
 388                  "use gnulib module dup3 for portability");
 389 # endif
 390 #endif
 391
 392
 393 #if @GNULIB_ENVIRON@
 394 # if !@HAVE_DECL_ENVIRON@
 395 /* Set of environment variables and values.  An array of strings of the form
 396    "VARIABLE=VALUE", terminated with a NULL.  */
 397 #  if defined __APPLE__ && defined __MACH__
 398 #   include <crt_externs.h>
 399 #   define environ (*_NSGetEnviron ())
 400 #  else
 401 #   ifdef __cplusplus
 402 extern "C" {
 403 #   endif
 404 extern char **environ;
 405 #   ifdef __cplusplus
 406 }
 407 #   endif
 408 #  endif
 409 # endif
 410 #elif defined GNULIB_POSIXCHECK
 411 # if HAVE_RAW_DECL_ENVIRON
 412 _GL_UNISTD_INLINE char ***
 413 rpl_environ (void)
 414 {
 415   return &environ;
 416 }
 417 _GL_WARN_ON_USE (rpl_environ, "environ is unportable - "
 418                  "use gnulib module environ for portability");
 419 #  undef environ
 420 #  define environ (*rpl_environ ())
 421 # endif
 422 #endif
 423
 424
 425 #if @GNULIB_EUIDACCESS@
 426 /* Like access(), except that it uses the effective user id and group id of
 427    the current process.  */
 428 # if !@HAVE_EUIDACCESS@
 429 _GL_FUNCDECL_SYS (euidaccess, int, (const char *filename, int mode)
 430                                    _GL_ARG_NONNULL ((1)));
 431 # endif
 432 _GL_CXXALIAS_SYS (euidaccess, int, (const char *filename, int mode));
 433 _GL_CXXALIASWARN (euidaccess);
 434 # if defined GNULIB_POSIXCHECK
 435 /* Like access(), this function is a security risk.  */
 436 _GL_WARN_ON_USE (euidaccess, "the euidaccess function is a security risk - "
 437                  "use the gnulib module faccessat instead");
 438 # endif
 439 #elif defined GNULIB_POSIXCHECK
 440 # undef euidaccess
 441 # if HAVE_RAW_DECL_EUIDACCESS
 442 _GL_WARN_ON_USE (euidaccess, "euidaccess is unportable - "
 443                  "use gnulib module euidaccess for portability");
 444 # endif
 445 #endif
 446
 447
 448 #if @GNULIB_FACCESSAT@
 449 # if !@HAVE_FACCESSAT@
 450 _GL_FUNCDECL_SYS (faccessat, int,
 451                   (int fd, char const *file, int mode, int flag)
 452                   _GL_ARG_NONNULL ((2)));
 453 # endif
 454 _GL_CXXALIAS_SYS (faccessat, int,
 455                   (int fd, char const *file, int mode, int flag));
 456 _GL_CXXALIASWARN (faccessat);
 457 #elif defined GNULIB_POSIXCHECK
 458 # undef faccessat
 459 # if HAVE_RAW_DECL_FACCESSAT
 460 _GL_WARN_ON_USE (faccessat, "faccessat is not portable - "
 461                  "use gnulib module faccessat for portability");
 462 # endif
 463 #endif
 464
 465
 466 #if @GNULIB_FCHDIR@
 467 /* Change the process' current working directory to the directory on which
 468    the given file descriptor is open.
 469    Return 0 if successful, otherwise -1 and errno set.
 470    See the POSIX:2008 specification
 471    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/fchdir.html>.  */
 472 # if ! @HAVE_FCHDIR@
 473 _GL_FUNCDECL_SYS (fchdir, int, (int /*fd*/));
 474
 475 /* Gnulib internal hooks needed to maintain the fchdir metadata.  */
 476 _GL_EXTERN_C int _gl_register_fd (int fd, const char *filename)
 477      _GL_ARG_NONNULL ((2));
 478 _GL_EXTERN_C void _gl_unregister_fd (int fd);
 479 _GL_EXTERN_C int _gl_register_dup (int oldfd, int newfd);
 480 _GL_EXTERN_C const char *_gl_directory_name (int fd);
 481
 482 # else
 483 #  if !@HAVE_DECL_FCHDIR@
 484 _GL_FUNCDECL_SYS (fchdir, int, (int /*fd*/));
 485 #  endif
 486 # endif
 487 _GL_CXXALIAS_SYS (fchdir, int, (int /*fd*/));
 488 _GL_CXXALIASWARN (fchdir);
 489 #elif defined GNULIB_POSIXCHECK
 490 # undef fchdir
 491 # if HAVE_RAW_DECL_FCHDIR
 492 _GL_WARN_ON_USE (fchdir, "fchdir is unportable - "
 493                  "use gnulib module fchdir for portability");
 494 # endif
 495 #endif
 496
 497
 498 #if @GNULIB_FCHOWNAT@
 499 # if @REPLACE_FCHOWNAT@
 500 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 501 #   undef fchownat
 502 #   define fchownat rpl_fchownat
 503 #  endif
 504 _GL_FUNCDECL_RPL (fchownat, int, (int fd, char const *file,
 505                                   uid_t owner, gid_t group, int flag)
 506                                  _GL_ARG_NONNULL ((2)));
 507 _GL_CXXALIAS_RPL (fchownat, int, (int fd, char const *file,
 508                                   uid_t owner, gid_t group, int flag));
 509 # else
 510 #  if !@HAVE_FCHOWNAT@
 511 _GL_FUNCDECL_SYS (fchownat, int, (int fd, char const *file,
 512                                   uid_t owner, gid_t group, int flag)
 513                                  _GL_ARG_NONNULL ((2)));
 514 #  endif
 515 _GL_CXXALIAS_SYS (fchownat, int, (int fd, char const *file,
 516                                   uid_t owner, gid_t group, int flag));
 517 # endif
 518 _GL_CXXALIASWARN (fchownat);
 519 #elif defined GNULIB_POSIXCHECK
 520 # undef fchownat
 521 # if HAVE_RAW_DECL_FCHOWNAT
 522 _GL_WARN_ON_USE (fchownat, "fchownat is not portable - "
 523                  "use gnulib module openat for portability");
 524 # endif
 525 #endif
 526
 527
 528 #if @GNULIB_FDATASYNC@
 529 /* Synchronize changes to a file.
 530    Return 0 if successful, otherwise -1 and errno set.
 531    See POSIX:2008 specification
 532    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/fdatasync.html>.  */
 533 # if !@HAVE_FDATASYNC@ || !@HAVE_DECL_FDATASYNC@
 534 _GL_FUNCDECL_SYS (fdatasync, int, (int fd));
 535 # endif
 536 _GL_CXXALIAS_SYS (fdatasync, int, (int fd));
 537 _GL_CXXALIASWARN (fdatasync);
 538 #elif defined GNULIB_POSIXCHECK
 539 # undef fdatasync
 540 # if HAVE_RAW_DECL_FDATASYNC
 541 _GL_WARN_ON_USE (fdatasync, "fdatasync is unportable - "
 542                  "use gnulib module fdatasync for portability");
 543 # endif
 544 #endif
 545
 546
 547 #if @GNULIB_FSYNC@
 548 /* Synchronize changes, including metadata, to a file.
 549    Return 0 if successful, otherwise -1 and errno set.
 550    See POSIX:2008 specification
 551    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/fsync.html>.  */
 552 # if !@HAVE_FSYNC@
 553 _GL_FUNCDECL_SYS (fsync, int, (int fd));
 554 # endif
 555 _GL_CXXALIAS_SYS (fsync, int, (int fd));
 556 _GL_CXXALIASWARN (fsync);
 557 #elif defined GNULIB_POSIXCHECK
 558 # undef fsync
 559 # if HAVE_RAW_DECL_FSYNC
 560 _GL_WARN_ON_USE (fsync, "fsync is unportable - "
 561                  "use gnulib module fsync for portability");
 562 # endif
 563 #endif
 564
 565
 566 #if @GNULIB_FTRUNCATE@
 567 /* Change the size of the file to which FD is opened to become equal to LENGTH.
 568    Return 0 if successful, otherwise -1 and errno set.
 569    See the POSIX:2008 specification
 570    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/ftruncate.html>.  */
 571 # if @REPLACE_FTRUNCATE@
 572 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 573 #   undef ftruncate
 574 #   define ftruncate rpl_ftruncate
 575 #  endif
 576 _GL_FUNCDECL_RPL (ftruncate, int, (int fd, off_t length));
 577 _GL_CXXALIAS_RPL (ftruncate, int, (int fd, off_t length));
 578 # else
 579 #  if !@HAVE_FTRUNCATE@
 580 _GL_FUNCDECL_SYS (ftruncate, int, (int fd, off_t length));
 581 #  endif
 582 _GL_CXXALIAS_SYS (ftruncate, int, (int fd, off_t length));
 583 # endif
 584 _GL_CXXALIASWARN (ftruncate);
 585 #elif defined GNULIB_POSIXCHECK
 586 # undef ftruncate
 587 # if HAVE_RAW_DECL_FTRUNCATE
 588 _GL_WARN_ON_USE (ftruncate, "ftruncate is unportable - "
 589                  "use gnulib module ftruncate for portability");
 590 # endif
 591 #endif
 592
 593
 594 #if @GNULIB_GETCWD@
 595 /* Get the name of the current working directory, and put it in SIZE bytes
 596    of BUF.
 597    Return BUF if successful, or NULL if the directory couldn't be determined
 598    or SIZE was too small.
 599    See the POSIX:2008 specification
 600    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/getcwd.html>.
 601    Additionally, the gnulib module 'getcwd' guarantees the following GNU
 602    extension: If BUF is NULL, an array is allocated with 'malloc'; the array
 603    is SIZE bytes long, unless SIZE == 0, in which case it is as big as
 604    necessary.  */
 605 # if @REPLACE_GETCWD@
 606 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 607 #   define getcwd rpl_getcwd
 608 #  endif
 609 _GL_FUNCDECL_RPL (getcwd, char *, (char *buf, size_t size));
 610 _GL_CXXALIAS_RPL (getcwd, char *, (char *buf, size_t size));
 611 # else
 612 /* Need to cast, because on mingw, the second parameter is
 613                                                    int size.  */
 614 _GL_CXXALIAS_SYS_CAST (getcwd, char *, (char *buf, size_t size));
 615 # endif
 616 _GL_CXXALIASWARN (getcwd);
 617 #elif defined GNULIB_POSIXCHECK
 618 # undef getcwd
 619 # if HAVE_RAW_DECL_GETCWD
 620 _GL_WARN_ON_USE (getcwd, "getcwd is unportable - "
 621                  "use gnulib module getcwd for portability");
 622 # endif
 623 #endif
 624
 625
 626 #if @GNULIB_GETDOMAINNAME@
 627 /* Return the NIS domain name of the machine.
 628    WARNING! The NIS domain name is unrelated to the fully qualified host name
 629             of the machine.  It is also unrelated to email addresses.
 630    WARNING! The NIS domain name is usually the empty string or "(none)" when
 631             not using NIS.
 632
 633    Put up to LEN bytes of the NIS domain name into NAME.
 634    Null terminate it if the name is shorter than LEN.
 635    If the NIS domain name is longer than LEN, set errno = EINVAL and return -1.
 636    Return 0 if successful, otherwise set errno and return -1.  */
 637 # if @REPLACE_GETDOMAINNAME@
 638 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 639 #   undef getdomainname
 640 #   define getdomainname rpl_getdomainname
 641 #  endif
 642 _GL_FUNCDECL_RPL (getdomainname, int, (char *name, size_t len)
 643                                       _GL_ARG_NONNULL ((1)));
 644 _GL_CXXALIAS_RPL (getdomainname, int, (char *name, size_t len));
 645 # else
 646 #  if !@HAVE_DECL_GETDOMAINNAME@
 647 _GL_FUNCDECL_SYS (getdomainname, int, (char *name, size_t len)
 648                                       _GL_ARG_NONNULL ((1)));
 649 #  endif
 650 _GL_CXXALIAS_SYS (getdomainname, int, (char *name, size_t len));
 651 # endif
 652 _GL_CXXALIASWARN (getdomainname);
 653 #elif defined GNULIB_POSIXCHECK
 654 # undef getdomainname
 655 # if HAVE_RAW_DECL_GETDOMAINNAME
 656 _GL_WARN_ON_USE (getdomainname, "getdomainname is unportable - "
 657                  "use gnulib module getdomainname for portability");
 658 # endif
 659 #endif
 660
 661
 662 #if @GNULIB_GETDTABLESIZE@
 663 /* Return the maximum number of file descriptors in the current process.
 664    In POSIX, this is same as sysconf (_SC_OPEN_MAX).  */
 665 # if !@HAVE_GETDTABLESIZE@
 666 _GL_FUNCDECL_SYS (getdtablesize, int, (void));
 667 # endif
 668 _GL_CXXALIAS_SYS (getdtablesize, int, (void));
 669 _GL_CXXALIASWARN (getdtablesize);
 670 #elif defined GNULIB_POSIXCHECK
 671 # undef getdtablesize
 672 # if HAVE_RAW_DECL_GETDTABLESIZE
 673 _GL_WARN_ON_USE (getdtablesize, "getdtablesize is unportable - "
 674                  "use gnulib module getdtablesize for portability");
 675 # endif
 676 #endif
 677
 678
 679 #if @GNULIB_GETGROUPS@
 680 /* Return the supplemental groups that the current process belongs to.
 681    It is unspecified whether the effective group id is in the list.
 682    If N is 0, return the group count; otherwise, N describes how many
 683    entries are available in GROUPS.  Return -1 and set errno if N is
 684    not 0 and not large enough.  Fails with ENOSYS on some systems.  */
 685 # if @REPLACE_GETGROUPS@
 686 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 687 #   undef getgroups
 688 #   define getgroups rpl_getgroups
 689 #  endif
 690 _GL_FUNCDECL_RPL (getgroups, int, (int n, gid_t *groups));
 691 _GL_CXXALIAS_RPL (getgroups, int, (int n, gid_t *groups));
 692 # else
 693 #  if !@HAVE_GETGROUPS@
 694 _GL_FUNCDECL_SYS (getgroups, int, (int n, gid_t *groups));
 695 #  endif
 696 _GL_CXXALIAS_SYS (getgroups, int, (int n, gid_t *groups));
 697 # endif
 698 _GL_CXXALIASWARN (getgroups);
 699 #elif defined GNULIB_POSIXCHECK
 700 # undef getgroups
 701 # if HAVE_RAW_DECL_GETGROUPS
 702 _GL_WARN_ON_USE (getgroups, "getgroups is unportable - "
 703                  "use gnulib module getgroups for portability");
 704 # endif
 705 #endif
 706
 707
 708 #if @GNULIB_GETHOSTNAME@
 709 /* Return the standard host name of the machine.
 710    WARNING! The host name may or may not be fully qualified.
 711
 712    Put up to LEN bytes of the host name into NAME.
 713    Null terminate it if the name is shorter than LEN.
 714    If the host name is longer than LEN, set errno = EINVAL and return -1.
 715    Return 0 if successful, otherwise set errno and return -1.  */
 716 # if @UNISTD_H_HAVE_WINSOCK2_H@
 717 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 718 #   undef gethostname
 719 #   define gethostname rpl_gethostname
 720 #  endif
 721 _GL_FUNCDECL_RPL (gethostname, int, (char *name, size_t len)
 722                                     _GL_ARG_NONNULL ((1)));
 723 _GL_CXXALIAS_RPL (gethostname, int, (char *name, size_t len));
 724 # else
 725 #  if !@HAVE_GETHOSTNAME@
 726 _GL_FUNCDECL_SYS (gethostname, int, (char *name, size_t len)
 727                                     _GL_ARG_NONNULL ((1)));
 728 #  endif
 729 /* Need to cast, because on Solaris 10 and OSF/1 5.1 systems, the second
 730    parameter is
 731                                                       int len.  */
 732 _GL_CXXALIAS_SYS_CAST (gethostname, int, (char *name, size_t len));
 733 # endif
 734 _GL_CXXALIASWARN (gethostname);
 735 #elif @UNISTD_H_HAVE_WINSOCK2_H@
 736 # undef gethostname
 737 # define gethostname gethostname_used_without_requesting_gnulib_module_gethostname
 738 #elif defined GNULIB_POSIXCHECK
 739 # undef gethostname
 740 # if HAVE_RAW_DECL_GETHOSTNAME
 741 _GL_WARN_ON_USE (gethostname, "gethostname is unportable - "
 742                  "use gnulib module gethostname for portability");
 743 # endif
 744 #endif
 745
 746
 747 #if @GNULIB_GETLOGIN@
 748 /* Returns the user's login name, or NULL if it cannot be found.  Upon error,
 749    returns NULL with errno set.
 750
 751    See <http://www.opengroup.org/susv3xsh/getlogin.html>.
 752
 753    Most programs don't need to use this function, because the information is
 754    available through environment variables:
 755      ${LOGNAME-$USER}        on Unix platforms,
 756      $USERNAME               on native Windows platforms.
 757  */
 758 # if !@HAVE_GETLOGIN@
 759 _GL_FUNCDECL_SYS (getlogin, char *, (void));
 760 # endif
 761 _GL_CXXALIAS_SYS (getlogin, char *, (void));
 762 _GL_CXXALIASWARN (getlogin);
 763 #elif defined GNULIB_POSIXCHECK
 764 # undef getlogin
 765 # if HAVE_RAW_DECL_GETLOGIN
 766 _GL_WARN_ON_USE (getlogin, "getlogin is unportable - "
 767                  "use gnulib module getlogin for portability");
 768 # endif
 769 #endif
 770
 771
 772 #if @GNULIB_GETLOGIN_R@
 773 /* Copies the user's login name to NAME.
 774    The array pointed to by NAME has room for SIZE bytes.
 775
 776    Returns 0 if successful.  Upon error, an error number is returned, or -1 in
 777    the case that the login name cannot be found but no specific error is
 778    provided (this case is hopefully rare but is left open by the POSIX spec).
 779
 780    See <http://www.opengroup.org/susv3xsh/getlogin.html>.
 781
 782    Most programs don't need to use this function, because the information is
 783    available through environment variables:
 784      ${LOGNAME-$USER}        on Unix platforms,
 785      $USERNAME               on native Windows platforms.
 786  */
 787 # if @REPLACE_GETLOGIN_R@
 788 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 789 #   define getlogin_r rpl_getlogin_r
 790 #  endif
 791 _GL_FUNCDECL_RPL (getlogin_r, int, (char *name, size_t size)
 792                                    _GL_ARG_NONNULL ((1)));
 793 _GL_CXXALIAS_RPL (getlogin_r, int, (char *name, size_t size));
 794 # else
 795 #  if !@HAVE_DECL_GETLOGIN_R@
 796 _GL_FUNCDECL_SYS (getlogin_r, int, (char *name, size_t size)
 797                                    _GL_ARG_NONNULL ((1)));
 798 #  endif
 799 /* Need to cast, because on Solaris 10 systems, the second argument is
 800                                                      int size.  */
 801 _GL_CXXALIAS_SYS_CAST (getlogin_r, int, (char *name, size_t size));
 802 # endif
 803 _GL_CXXALIASWARN (getlogin_r);
 804 #elif defined GNULIB_POSIXCHECK
 805 # undef getlogin_r
 806 # if HAVE_RAW_DECL_GETLOGIN_R
 807 _GL_WARN_ON_USE (getlogin_r, "getlogin_r is unportable - "
 808                  "use gnulib module getlogin_r for portability");
 809 # endif
 810 #endif
 811
 812
 813 #if @GNULIB_GETPAGESIZE@
 814 # if @REPLACE_GETPAGESIZE@
 815 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 816 #   define getpagesize rpl_getpagesize
 817 #  endif
 818 _GL_FUNCDECL_RPL (getpagesize, int, (void));
 819 _GL_CXXALIAS_RPL (getpagesize, int, (void));
 820 # else
 821 #  if !@HAVE_GETPAGESIZE@
 822 #   if !defined getpagesize
 823 /* This is for POSIX systems.  */
 824 #    if !defined _gl_getpagesize && defined _SC_PAGESIZE
 825 #     if ! (defined __VMS && __VMS_VER < 70000000)
 826 #      define _gl_getpagesize() sysconf (_SC_PAGESIZE)
 827 #     endif
 828 #    endif
 829 /* This is for older VMS.  */
 830 #    if !defined _gl_getpagesize && defined __VMS
 831 #     ifdef __ALPHA
 832 #      define _gl_getpagesize() 8192
 833 #     else
 834 #      define _gl_getpagesize() 512
 835 #     endif
 836 #    endif
 837 /* This is for BeOS.  */
 838 #    if !defined _gl_getpagesize && @HAVE_OS_H@
 839 #     include <OS.h>
 840 #     if defined B_PAGE_SIZE
 841 #      define _gl_getpagesize() B_PAGE_SIZE
 842 #     endif
 843 #    endif
 844 /* This is for AmigaOS4.0.  */
 845 #    if !defined _gl_getpagesize && defined __amigaos4__
 846 #     define _gl_getpagesize() 2048
 847 #    endif
 848 /* This is for older Unix systems.  */
 849 #    if !defined _gl_getpagesize && @HAVE_SYS_PARAM_H@
 850 #     include <sys/param.h>
 851 #     ifdef EXEC_PAGESIZE
 852 #      define _gl_getpagesize() EXEC_PAGESIZE
 853 #     else
 854 #      ifdef NBPG
 855 #       ifndef CLSIZE
 856 #        define CLSIZE 1
 857 #       endif
 858 #       define _gl_getpagesize() (NBPG * CLSIZE)
 859 #      else
 860 #       ifdef NBPC
 861 #        define _gl_getpagesize() NBPC
 862 #       endif
 863 #      endif
 864 #     endif
 865 #    endif
 866 #    if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 867 #     define getpagesize() _gl_getpagesize ()
 868 #    else
 869 #     if !GNULIB_defined_getpagesize_function
 870 _GL_UNISTD_INLINE int
 871 getpagesize ()
 872 {
 873   return _gl_getpagesize ();
 874 }
 875 #      define GNULIB_defined_getpagesize_function 1
 876 #     endif
 877 #    endif
 878 #   endif
 879 #  endif
 880 /* Need to cast, because on Cygwin 1.5.x systems, the return type is size_t.  */
 881 _GL_CXXALIAS_SYS_CAST (getpagesize, int, (void));
 882 # endif
 883 # if @HAVE_DECL_GETPAGESIZE@
 884 _GL_CXXALIASWARN (getpagesize);
 885 # endif
 886 #elif defined GNULIB_POSIXCHECK
 887 # undef getpagesize
 888 # if HAVE_RAW_DECL_GETPAGESIZE
 889 _GL_WARN_ON_USE (getpagesize, "getpagesize is unportable - "
 890                  "use gnulib module getpagesize for portability");
 891 # endif
 892 #endif
 893
 894
 895 #if @GNULIB_GETUSERSHELL@
 896 /* Return the next valid login shell on the system, or NULL when the end of
 897    the list has been reached.  */
 898 # if !@HAVE_DECL_GETUSERSHELL@
 899 _GL_FUNCDECL_SYS (getusershell, char *, (void));
 900 # endif
 901 _GL_CXXALIAS_SYS (getusershell, char *, (void));
 902 _GL_CXXALIASWARN (getusershell);
 903 #elif defined GNULIB_POSIXCHECK
 904 # undef getusershell
 905 # if HAVE_RAW_DECL_GETUSERSHELL
 906 _GL_WARN_ON_USE (getusershell, "getusershell is unportable - "
 907                  "use gnulib module getusershell for portability");
 908 # endif
 909 #endif
 910
 911 #if @GNULIB_GETUSERSHELL@
 912 /* Rewind to pointer that is advanced at each getusershell() call.  */
 913 # if !@HAVE_DECL_GETUSERSHELL@
 914 _GL_FUNCDECL_SYS (setusershell, void, (void));
 915 # endif
 916 _GL_CXXALIAS_SYS (setusershell, void, (void));
 917 _GL_CXXALIASWARN (setusershell);
 918 #elif defined GNULIB_POSIXCHECK
 919 # undef setusershell
 920 # if HAVE_RAW_DECL_SETUSERSHELL
 921 _GL_WARN_ON_USE (setusershell, "setusershell is unportable - "
 922                  "use gnulib module getusershell for portability");
 923 # endif
 924 #endif
 925
 926 #if @GNULIB_GETUSERSHELL@
 927 /* Free the pointer that is advanced at each getusershell() call and
 928    associated resources.  */
 929 # if !@HAVE_DECL_GETUSERSHELL@
 930 _GL_FUNCDECL_SYS (endusershell, void, (void));
 931 # endif
 932 _GL_CXXALIAS_SYS (endusershell, void, (void));
 933 _GL_CXXALIASWARN (endusershell);
 934 #elif defined GNULIB_POSIXCHECK
 935 # undef endusershell
 936 # if HAVE_RAW_DECL_ENDUSERSHELL
 937 _GL_WARN_ON_USE (endusershell, "endusershell is unportable - "
 938                  "use gnulib module getusershell for portability");
 939 # endif
 940 #endif
 941
 942
 943 #if @GNULIB_GROUP_MEMBER@
 944 /* Determine whether group id is in calling user's group list.  */
 945 # if !@HAVE_GROUP_MEMBER@
 946 _GL_FUNCDECL_SYS (group_member, int, (gid_t gid));
 947 # endif
 948 _GL_CXXALIAS_SYS (group_member, int, (gid_t gid));
 949 _GL_CXXALIASWARN (group_member);
 950 #elif defined GNULIB_POSIXCHECK
 951 # undef group_member
 952 # if HAVE_RAW_DECL_GROUP_MEMBER
 953 _GL_WARN_ON_USE (group_member, "group_member is unportable - "
 954                  "use gnulib module group-member for portability");
 955 # endif
 956 #endif
 957
 958
 959 #if @GNULIB_ISATTY@
 960 # if @REPLACE_ISATTY@
 961 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 962 #   undef isatty
 963 #   define isatty rpl_isatty
 964 #  endif
 965 _GL_FUNCDECL_RPL (isatty, int, (int fd));
 966 _GL_CXXALIAS_RPL (isatty, int, (int fd));
 967 # else
 968 _GL_CXXALIAS_SYS (isatty, int, (int fd));
 969 # endif
 970 _GL_CXXALIASWARN (isatty);
 971 #elif defined GNULIB_POSIXCHECK
 972 # undef isatty
 973 # if HAVE_RAW_DECL_ISATTY
 974 _GL_WARN_ON_USE (isatty, "isatty has portability problems on native Windows - "
 975                  "use gnulib module isatty for portability");
 976 # endif
 977 #endif
 978
 979
 980 #if @GNULIB_LCHOWN@
 981 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
 982    to GID (if GID is not -1).  Do not follow symbolic links.
 983    Return 0 if successful, otherwise -1 and errno set.
 984    See the POSIX:2008 specification
 985    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/lchown.html>.  */
 986 # if @REPLACE_LCHOWN@
 987 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 988 #   undef lchown
 989 #   define lchown rpl_lchown
 990 #  endif
 991 _GL_FUNCDECL_RPL (lchown, int, (char const *file, uid_t owner, gid_t group)
 992                                _GL_ARG_NONNULL ((1)));
 993 _GL_CXXALIAS_RPL (lchown, int, (char const *file, uid_t owner, gid_t group));
 994 # else
 995 #  if !@HAVE_LCHOWN@
 996 _GL_FUNCDECL_SYS (lchown, int, (char const *file, uid_t owner, gid_t group)
 997                                _GL_ARG_NONNULL ((1)));
 998 #  endif
 999 _GL_CXXALIAS_SYS (lchown, int, (char const *file, uid_t owner, gid_t group));
1000 # endif
1001 _GL_CXXALIASWARN (lchown);
1002 #elif defined GNULIB_POSIXCHECK
1003 # undef lchown
1004 # if HAVE_RAW_DECL_LCHOWN
1005 _GL_WARN_ON_USE (lchown, "lchown is unportable to pre-POSIX.1-2001 systems - "
1006                  "use gnulib module lchown for portability");
1007 # endif
1008 #endif
1009
1010
1011 #if @GNULIB_LINK@
1012 /* Create a new hard link for an existing file.
1013    Return 0 if successful, otherwise -1 and errno set.
1014    See POSIX:2008 specification
1015    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/link.html>.  */
1016 # if @REPLACE_LINK@
1017 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1018 #   define link rpl_link
1019 #  endif
1020 _GL_FUNCDECL_RPL (link, int, (const char *path1, const char *path2)
1021                              _GL_ARG_NONNULL ((1, 2)));
1022 _GL_CXXALIAS_RPL (link, int, (const char *path1, const char *path2));
1023 # else
1024 #  if !@HAVE_LINK@
1025 _GL_FUNCDECL_SYS (link, int, (const char *path1, const char *path2)
1026                              _GL_ARG_NONNULL ((1, 2)));
1027 #  endif
1028 _GL_CXXALIAS_SYS (link, int, (const char *path1, const char *path2));
1029 # endif
1030 _GL_CXXALIASWARN (link);
1031 #elif defined GNULIB_POSIXCHECK
1032 # undef link
1033 # if HAVE_RAW_DECL_LINK
1034 _GL_WARN_ON_USE (link, "link is unportable - "
1035                  "use gnulib module link for portability");
1036 # endif
1037 #endif
1038
1039
1040 #if @GNULIB_LINKAT@
1041 /* Create a new hard link for an existing file, relative to two
1042    directories.  FLAG controls whether symlinks are followed.
1043    Return 0 if successful, otherwise -1 and errno set.  */
1044 # if @REPLACE_LINKAT@
1045 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1046 #   undef linkat
1047 #   define linkat rpl_linkat
1048 #  endif
1049 _GL_FUNCDECL_RPL (linkat, int,
1050                   (int fd1, const char *path1, int fd2, const char *path2,
1051                    int flag)
1052                   _GL_ARG_NONNULL ((2, 4)));
1053 _GL_CXXALIAS_RPL (linkat, int,
1054                   (int fd1, const char *path1, int fd2, const char *path2,
1055                    int flag));
1056 # else
1057 #  if !@HAVE_LINKAT@
1058 _GL_FUNCDECL_SYS (linkat, int,
1059                   (int fd1, const char *path1, int fd2, const char *path2,
1060                    int flag)
1061                   _GL_ARG_NONNULL ((2, 4)));
1062 #  endif
1063 _GL_CXXALIAS_SYS (linkat, int,
1064                   (int fd1, const char *path1, int fd2, const char *path2,
1065                    int flag));
1066 # endif
1067 _GL_CXXALIASWARN (linkat);
1068 #elif defined GNULIB_POSIXCHECK
1069 # undef linkat
1070 # if HAVE_RAW_DECL_LINKAT
1071 _GL_WARN_ON_USE (linkat, "linkat is unportable - "
1072                  "use gnulib module linkat for portability");
1073 # endif
1074 #endif
1075
1076
1077 #if @GNULIB_LSEEK@
1078 /* Set the offset of FD relative to SEEK_SET, SEEK_CUR, or SEEK_END.
1079    Return the new offset if successful, otherwise -1 and errno set.
1080    See the POSIX:2008 specification
1081    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/lseek.html>.  */
1082 # if @REPLACE_LSEEK@
1083 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1084 #   define lseek rpl_lseek
1085 #  endif
1086 _GL_FUNCDECL_RPL (lseek, off_t, (int fd, off_t offset, int whence));
1087 _GL_CXXALIAS_RPL (lseek, off_t, (int fd, off_t offset, int whence));
1088 # else
1089 _GL_CXXALIAS_SYS (lseek, off_t, (int fd, off_t offset, int whence));
1090 # endif
1091 _GL_CXXALIASWARN (lseek);
1092 #elif defined GNULIB_POSIXCHECK
1093 # undef lseek
1094 # if HAVE_RAW_DECL_LSEEK
1095 _GL_WARN_ON_USE (lseek, "lseek does not fail with ESPIPE on pipes on some "
1096                  "systems - use gnulib module lseek for portability");
1097 # endif
1098 #endif
1099
1100
1101 #if @GNULIB_PIPE@
1102 /* Create a pipe, defaulting to O_BINARY mode.
1103    Store the read-end as fd[0] and the write-end as fd[1].
1104    Return 0 upon success, or -1 with errno set upon failure.  */
1105 # if !@HAVE_PIPE@
1106 _GL_FUNCDECL_SYS (pipe, int, (int fd[2]) _GL_ARG_NONNULL ((1)));
1107 # endif
1108 _GL_CXXALIAS_SYS (pipe, int, (int fd[2]));
1109 _GL_CXXALIASWARN (pipe);
1110 #elif defined GNULIB_POSIXCHECK
1111 # undef pipe
1112 # if HAVE_RAW_DECL_PIPE
1113 _GL_WARN_ON_USE (pipe, "pipe is unportable - "
1114                  "use gnulib module pipe-posix for portability");
1115 # endif
1116 #endif
1117
1118
1119 #if @GNULIB_PIPE2@
1120 /* Create a pipe, applying the given flags when opening the read-end of the
1121    pipe and the write-end of the pipe.
1122    The flags are a bitmask, possibly including O_CLOEXEC (defined in <fcntl.h>)
1123    and O_TEXT, O_BINARY (defined in "binary-io.h").
1124    Store the read-end as fd[0] and the write-end as fd[1].
1125    Return 0 upon success, or -1 with errno set upon failure.
1126    See also the Linux man page at
1127    <http://www.kernel.org/doc/man-pages/online/pages/man2/pipe2.2.html>.  */
1128 # if @HAVE_PIPE2@
1129 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1130 #   define pipe2 rpl_pipe2
1131 #  endif
1132 _GL_FUNCDECL_RPL (pipe2, int, (int fd[2], int flags) _GL_ARG_NONNULL ((1)));
1133 _GL_CXXALIAS_RPL (pipe2, int, (int fd[2], int flags));
1134 # else
1135 _GL_FUNCDECL_SYS (pipe2, int, (int fd[2], int flags) _GL_ARG_NONNULL ((1)));
1136 _GL_CXXALIAS_SYS (pipe2, int, (int fd[2], int flags));
1137 # endif
1138 _GL_CXXALIASWARN (pipe2);
1139 #elif defined GNULIB_POSIXCHECK
1140 # undef pipe2
1141 # if HAVE_RAW_DECL_PIPE2
1142 _GL_WARN_ON_USE (pipe2, "pipe2 is unportable - "
1143                  "use gnulib module pipe2 for portability");
1144 # endif
1145 #endif
1146
1147
1148 #if @GNULIB_PREAD@
1149 /* Read at most BUFSIZE bytes from FD into BUF, starting at OFFSET.
1150    Return the number of bytes placed into BUF if successful, otherwise
1151    set errno and return -1.  0 indicates EOF.
1152    See the POSIX:2008 specification
1153    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/pread.html>.  */
1154 # if @REPLACE_PREAD@
1155 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1156 #   undef pread
1157 #   define pread rpl_pread
1158 #  endif
1159 _GL_FUNCDECL_RPL (pread, ssize_t,
1160                   (int fd, void *buf, size_t bufsize, off_t offset)
1161                   _GL_ARG_NONNULL ((2)));
1162 _GL_CXXALIAS_RPL (pread, ssize_t,
1163                   (int fd, void *buf, size_t bufsize, off_t offset));
1164 # else
1165 #  if !@HAVE_PREAD@
1166 _GL_FUNCDECL_SYS (pread, ssize_t,
1167                   (int fd, void *buf, size_t bufsize, off_t offset)
1168                   _GL_ARG_NONNULL ((2)));
1169 #  endif
1170 _GL_CXXALIAS_SYS (pread, ssize_t,
1171                   (int fd, void *buf, size_t bufsize, off_t offset));
1172 # endif
1173 _GL_CXXALIASWARN (pread);
1174 #elif defined GNULIB_POSIXCHECK
1175 # undef pread
1176 # if HAVE_RAW_DECL_PREAD
1177 _GL_WARN_ON_USE (pread, "pread is unportable - "
1178                  "use gnulib module pread for portability");
1179 # endif
1180 #endif
1181
1182
1183 #if @GNULIB_PWRITE@
1184 /* Write at most BUFSIZE bytes from BUF into FD, starting at OFFSET.
1185    Return the number of bytes written if successful, otherwise
1186    set errno and return -1.  0 indicates nothing written.  See the
1187    POSIX:2008 specification
1188    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/pwrite.html>.  */
1189 # if @REPLACE_PWRITE@
1190 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1191 #   undef pwrite
1192 #   define pwrite rpl_pwrite
1193 #  endif
1194 _GL_FUNCDECL_RPL (pwrite, ssize_t,
1195                   (int fd, const void *buf, size_t bufsize, off_t offset)
1196                   _GL_ARG_NONNULL ((2)));
1197 _GL_CXXALIAS_RPL (pwrite, ssize_t,
1198                   (int fd, const void *buf, size_t bufsize, off_t offset));
1199 # else
1200 #  if !@HAVE_PWRITE@
1201 _GL_FUNCDECL_SYS (pwrite, ssize_t,
1202                   (int fd, const void *buf, size_t bufsize, off_t offset)
1203                   _GL_ARG_NONNULL ((2)));
1204 #  endif
1205 _GL_CXXALIAS_SYS (pwrite, ssize_t,
1206                   (int fd, const void *buf, size_t bufsize, off_t offset));
1207 # endif
1208 _GL_CXXALIASWARN (pwrite);
1209 #elif defined GNULIB_POSIXCHECK
1210 # undef pwrite
1211 # if HAVE_RAW_DECL_PWRITE
1212 _GL_WARN_ON_USE (pwrite, "pwrite is unportable - "
1213                  "use gnulib module pwrite for portability");
1214 # endif
1215 #endif
1216
1217
1218 #if @GNULIB_READ@
1219 /* Read up to COUNT bytes from file descriptor FD into the buffer starting
1220    at BUF.  See the POSIX:2008 specification
1221    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/read.html>.  */
1222 # if @REPLACE_READ@
1223 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1224 #   undef read
1225 #   define read rpl_read
1226 #  endif
1227 _GL_FUNCDECL_RPL (read, ssize_t, (int fd, void *buf, size_t count)
1228                                  _GL_ARG_NONNULL ((2)));
1229 _GL_CXXALIAS_RPL (read, ssize_t, (int fd, void *buf, size_t count));
1230 # else
1231 /* Need to cast, because on mingw, the third parameter is
1232                                                           unsigned int count
1233    and the return type is 'int'.  */
1234 _GL_CXXALIAS_SYS_CAST (read, ssize_t, (int fd, void *buf, size_t count));
1235 # endif
1236 _GL_CXXALIASWARN (read);
1237 #endif
1238
1239
1240 #if @GNULIB_READLINK@
1241 /* Read the contents of the symbolic link FILE and place the first BUFSIZE
1242    bytes of it into BUF.  Return the number of bytes placed into BUF if
1243    successful, otherwise -1 and errno set.
1244    See the POSIX:2008 specification
1245    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/readlink.html>.  */
1246 # if @REPLACE_READLINK@
1247 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1248 #   define readlink rpl_readlink
1249 #  endif
1250 _GL_FUNCDECL_RPL (readlink, ssize_t,
1251                   (const char *file, char *buf, size_t bufsize)
1252                   _GL_ARG_NONNULL ((1, 2)));
1253 _GL_CXXALIAS_RPL (readlink, ssize_t,
1254                   (const char *file, char *buf, size_t bufsize));
1255 # else
1256 #  if !@HAVE_READLINK@
1257 _GL_FUNCDECL_SYS (readlink, ssize_t,
1258                   (const char *file, char *buf, size_t bufsize)
1259                   _GL_ARG_NONNULL ((1, 2)));
1260 #  endif
1261 _GL_CXXALIAS_SYS (readlink, ssize_t,
1262                   (const char *file, char *buf, size_t bufsize));
1263 # endif
1264 _GL_CXXALIASWARN (readlink);
1265 #elif defined GNULIB_POSIXCHECK
1266 # undef readlink
1267 # if HAVE_RAW_DECL_READLINK
1268 _GL_WARN_ON_USE (readlink, "readlink is unportable - "
1269                  "use gnulib module readlink for portability");
1270 # endif
1271 #endif
1272
1273
1274 #if @GNULIB_READLINKAT@
1275 # if !@HAVE_READLINKAT@
1276 _GL_FUNCDECL_SYS (readlinkat, ssize_t,
1277                   (int fd, char const *file, char *buf, size_t len)
1278                   _GL_ARG_NONNULL ((2, 3)));
1279 # endif
1280 _GL_CXXALIAS_SYS (readlinkat, ssize_t,
1281                   (int fd, char const *file, char *buf, size_t len));
1282 _GL_CXXALIASWARN (readlinkat);
1283 #elif defined GNULIB_POSIXCHECK
1284 # undef readlinkat
1285 # if HAVE_RAW_DECL_READLINKAT
1286 _GL_WARN_ON_USE (readlinkat, "readlinkat is not portable - "
1287                  "use gnulib module readlinkat for portability");
1288 # endif
1289 #endif
1290
1291
1292 #if @GNULIB_RMDIR@
1293 /* Remove the directory DIR.  */
1294 # if @REPLACE_RMDIR@
1295 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1296 #   define rmdir rpl_rmdir
1297 #  endif
1298 _GL_FUNCDECL_RPL (rmdir, int, (char const *name) _GL_ARG_NONNULL ((1)));
1299 _GL_CXXALIAS_RPL (rmdir, int, (char const *name));
1300 # else
1301 _GL_CXXALIAS_SYS (rmdir, int, (char const *name));
1302 # endif
1303 _GL_CXXALIASWARN (rmdir);
1304 #elif defined GNULIB_POSIXCHECK
1305 # undef rmdir
1306 # if HAVE_RAW_DECL_RMDIR
1307 _GL_WARN_ON_USE (rmdir, "rmdir is unportable - "
1308                  "use gnulib module rmdir for portability");
1309 # endif
1310 #endif
1311
1312
1313 #if @GNULIB_SETHOSTNAME@
1314 /* Set the host name of the machine.
1315    The host name may or may not be fully qualified.
1316
1317    Put LEN bytes of NAME into the host name.
1318    Return 0 if successful, otherwise, set errno and return -1.
1319
1320    Platforms with no ability to set the hostname return -1 and set
1321    errno = ENOSYS.  */
1322 # if !@HAVE_SETHOSTNAME@ || !@HAVE_DECL_SETHOSTNAME@
1323 _GL_FUNCDECL_SYS (sethostname, int, (const char *name, size_t len)
1324                                     _GL_ARG_NONNULL ((1)));
1325 # endif
1326 /* Need to cast, because on Solaris 11 2011-10, Mac OS X 10.5, IRIX 6.5
1327    and FreeBSD 6.4 the second parameter is int.  On Solaris 11
1328    2011-10, the first parameter is not const.  */
1329 _GL_CXXALIAS_SYS_CAST (sethostname, int, (const char *name, size_t len));
1330 _GL_CXXALIASWARN (sethostname);
1331 #elif defined GNULIB_POSIXCHECK
1332 # undef sethostname
1333 # if HAVE_RAW_DECL_SETHOSTNAME
1334 _GL_WARN_ON_USE (sethostname, "sethostname is unportable - "
1335                  "use gnulib module sethostname for portability");
1336 # endif
1337 #endif
1338
1339
1340 #if @GNULIB_SLEEP@
1341 /* Pause the execution of the current thread for N seconds.
1342    Returns the number of seconds left to sleep.
1343    See the POSIX:2008 specification
1344    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/sleep.html>.  */
1345 # if @REPLACE_SLEEP@
1346 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1347 #   undef sleep
1348 #   define sleep rpl_sleep
1349 #  endif
1350 _GL_FUNCDECL_RPL (sleep, unsigned int, (unsigned int n));
1351 _GL_CXXALIAS_RPL (sleep, unsigned int, (unsigned int n));
1352 # else
1353 #  if !@HAVE_SLEEP@
1354 _GL_FUNCDECL_SYS (sleep, unsigned int, (unsigned int n));
1355 #  endif
1356 _GL_CXXALIAS_SYS (sleep, unsigned int, (unsigned int n));
1357 # endif
1358 _GL_CXXALIASWARN (sleep);
1359 #elif defined GNULIB_POSIXCHECK
1360 # undef sleep
1361 # if HAVE_RAW_DECL_SLEEP
1362 _GL_WARN_ON_USE (sleep, "sleep is unportable - "
1363                  "use gnulib module sleep for portability");
1364 # endif
1365 #endif
1366
1367
1368 #if @GNULIB_SYMLINK@
1369 # if @REPLACE_SYMLINK@
1370 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1371 #   undef symlink
1372 #   define symlink rpl_symlink
1373 #  endif
1374 _GL_FUNCDECL_RPL (symlink, int, (char const *contents, char const *file)
1375                                 _GL_ARG_NONNULL ((1, 2)));
1376 _GL_CXXALIAS_RPL (symlink, int, (char const *contents, char const *file));
1377 # else
1378 #  if !@HAVE_SYMLINK@
1379 _GL_FUNCDECL_SYS (symlink, int, (char const *contents, char const *file)
1380                                 _GL_ARG_NONNULL ((1, 2)));
1381 #  endif
1382 _GL_CXXALIAS_SYS (symlink, int, (char const *contents, char const *file));
1383 # endif
1384 _GL_CXXALIASWARN (symlink);
1385 #elif defined GNULIB_POSIXCHECK
1386 # undef symlink
1387 # if HAVE_RAW_DECL_SYMLINK
1388 _GL_WARN_ON_USE (symlink, "symlink is not portable - "
1389                  "use gnulib module symlink for portability");
1390 # endif
1391 #endif
1392
1393
1394 #if @GNULIB_SYMLINKAT@
1395 # if !@HAVE_SYMLINKAT@
1396 _GL_FUNCDECL_SYS (symlinkat, int,
1397                   (char const *contents, int fd, char const *file)
1398                   _GL_ARG_NONNULL ((1, 3)));
1399 # endif
1400 _GL_CXXALIAS_SYS (symlinkat, int,
1401                   (char const *contents, int fd, char const *file));
1402 _GL_CXXALIASWARN (symlinkat);
1403 #elif defined GNULIB_POSIXCHECK
1404 # undef symlinkat
1405 # if HAVE_RAW_DECL_SYMLINKAT
1406 _GL_WARN_ON_USE (symlinkat, "symlinkat is not portable - "
1407                  "use gnulib module symlinkat for portability");
1408 # endif
1409 #endif
1410
1411
1412 #if @GNULIB_TTYNAME_R@
1413 /* Store at most BUFLEN characters of the pathname of the terminal FD is
1414    open on in BUF.  Return 0 on success, otherwise an error number.  */
1415 # if @REPLACE_TTYNAME_R@
1416 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1417 #   undef ttyname_r
1418 #   define ttyname_r rpl_ttyname_r
1419 #  endif
1420 _GL_FUNCDECL_RPL (ttyname_r, int,
1421                   (int fd, char *buf, size_t buflen) _GL_ARG_NONNULL ((2)));
1422 _GL_CXXALIAS_RPL (ttyname_r, int,
1423                   (int fd, char *buf, size_t buflen));
1424 # else
1425 #  if !@HAVE_DECL_TTYNAME_R@
1426 _GL_FUNCDECL_SYS (ttyname_r, int,
1427                   (int fd, char *buf, size_t buflen) _GL_ARG_NONNULL ((2)));
1428 #  endif
1429 _GL_CXXALIAS_SYS (ttyname_r, int,
1430                   (int fd, char *buf, size_t buflen));
1431 # endif
1432 _GL_CXXALIASWARN (ttyname_r);
1433 #elif defined GNULIB_POSIXCHECK
1434 # undef ttyname_r
1435 # if HAVE_RAW_DECL_TTYNAME_R
1436 _GL_WARN_ON_USE (ttyname_r, "ttyname_r is not portable - "
1437                  "use gnulib module ttyname_r for portability");
1438 # endif
1439 #endif
1440
1441
1442 #if @GNULIB_UNLINK@
1443 # if @REPLACE_UNLINK@
1444 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1445 #   undef unlink
1446 #   define unlink rpl_unlink
1447 #  endif
1448 _GL_FUNCDECL_RPL (unlink, int, (char const *file) _GL_ARG_NONNULL ((1)));
1449 _GL_CXXALIAS_RPL (unlink, int, (char const *file));
1450 # else
1451 _GL_CXXALIAS_SYS (unlink, int, (char const *file));
1452 # endif
1453 _GL_CXXALIASWARN (unlink);
1454 #elif defined GNULIB_POSIXCHECK
1455 # undef unlink
1456 # if HAVE_RAW_DECL_UNLINK
1457 _GL_WARN_ON_USE (unlink, "unlink is not portable - "
1458                  "use gnulib module unlink for portability");
1459 # endif
1460 #endif
1461
1462
1463 #if @GNULIB_UNLINKAT@
1464 # if @REPLACE_UNLINKAT@
1465 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1466 #   undef unlinkat
1467 #   define unlinkat rpl_unlinkat
1468 #  endif
1469 _GL_FUNCDECL_RPL (unlinkat, int, (int fd, char const *file, int flag)
1470                                  _GL_ARG_NONNULL ((2)));
1471 _GL_CXXALIAS_RPL (unlinkat, int, (int fd, char const *file, int flag));
1472 # else
1473 #  if !@HAVE_UNLINKAT@
1474 _GL_FUNCDECL_SYS (unlinkat, int, (int fd, char const *file, int flag)
1475                                  _GL_ARG_NONNULL ((2)));
1476 #  endif
1477 _GL_CXXALIAS_SYS (unlinkat, int, (int fd, char const *file, int flag));
1478 # endif
1479 _GL_CXXALIASWARN (unlinkat);
1480 #elif defined GNULIB_POSIXCHECK
1481 # undef unlinkat
1482 # if HAVE_RAW_DECL_UNLINKAT
1483 _GL_WARN_ON_USE (unlinkat, "unlinkat is not portable - "
1484                  "use gnulib module openat for portability");
1485 # endif
1486 #endif
1487
1488
1489 #if @GNULIB_USLEEP@
1490 /* Pause the execution of the current thread for N microseconds.
1491    Returns 0 on completion, or -1 on range error.
1492    See the POSIX:2001 specification
1493    <http://www.opengroup.org/susv3xsh/usleep.html>.  */
1494 # if @REPLACE_USLEEP@
1495 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1496 #   undef usleep
1497 #   define usleep rpl_usleep
1498 #  endif
1499 _GL_FUNCDECL_RPL (usleep, int, (useconds_t n));
1500 _GL_CXXALIAS_RPL (usleep, int, (useconds_t n));
1501 # else
1502 #  if !@HAVE_USLEEP@
1503 _GL_FUNCDECL_SYS (usleep, int, (useconds_t n));
1504 #  endif
1505 _GL_CXXALIAS_SYS (usleep, int, (useconds_t n));
1506 # endif
1507 _GL_CXXALIASWARN (usleep);
1508 #elif defined GNULIB_POSIXCHECK
1509 # undef usleep
1510 # if HAVE_RAW_DECL_USLEEP
1511 _GL_WARN_ON_USE (usleep, "usleep is unportable - "
1512                  "use gnulib module usleep for portability");
1513 # endif
1514 #endif
1515
1516
1517 #if @GNULIB_WRITE@
1518 /* Write up to COUNT bytes starting at BUF to file descriptor FD.
1519    See the POSIX:2008 specification
1520    <http://pubs.opengroup.org/onlinepubs/9699919799/functions/write.html>.  */
1521 # if @REPLACE_WRITE@
1522 #  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
1523 #   undef write
1524 #   define write rpl_write
1525 #  endif
1526 _GL_FUNCDECL_RPL (write, ssize_t, (int fd, const void *buf, size_t count)
1527                                   _GL_ARG_NONNULL ((2)));
1528 _GL_CXXALIAS_RPL (write, ssize_t, (int fd, const void *buf, size_t count));
1529 # else
1530 /* Need to cast, because on mingw, the third parameter is
1531                                                              unsigned int count
1532    and the return type is 'int'.  */
1533 _GL_CXXALIAS_SYS_CAST (write, ssize_t, (int fd, const void *buf, size_t count));
1534 # endif
1535 _GL_CXXALIASWARN (write);
1536 #endif
1537
1538 _GL_INLINE_HEADER_END
1539
1540 #endif /* _@GUARD_PREFIX@_UNISTD_H */
1541 #endif /* _@GUARD_PREFIX@_UNISTD_H */