1 /* Substitute for and wrapper around <unistd.h>.
2 Copyright (C) 2004-2008 Free Software Foundation, Inc.
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 2, or (at your option)
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.
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. */
20 @PRAGMA_SYSTEM_HEADER@
22 /* The include_next requires a split double-inclusion guard. */
24 # @INCLUDE_NEXT@ @NEXT_UNISTD_H@
30 /* mingw doesn't define the SEEK_* macros in <unistd.h>. */
31 #if !(defined SEEK_CUR && defined SEEK_END && defined SEEK_SET)
35 /* mingw fails to declare _exit in <unistd.h>. */
38 #if @GNULIB_WRITE@ && @REPLACE_WRITE@ && @GNULIB_UNISTD_H_SIGPIPE@
40 # include <sys/types.h>
43 /* The definition of GL_LINK_WARNING is copied here. */
46 /* Declare overridden functions. */
55 # ifndef REPLACE_CHOWN
56 # define REPLACE_CHOWN 1
59 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
60 to GID (if GID is not -1). Follow symbolic links.
61 Return 0 if successful, otherwise -1 and errno set.
62 See the POSIX:2001 specification
63 <http://www.opengroup.org/susv3xsh/chown.html>. */
64 # define chown rpl_chown
65 extern int chown (const char *file, uid_t uid, gid_t gid);
68 #elif defined GNULIB_POSIXCHECK
70 # define chown(f,u,g) \
71 (GL_LINK_WARNING ("chown fails to follow symlinks on some systems and " \
72 "doesn't treat a uid or gid of -1 on some systems - " \
73 "use gnulib module chown for portability"), \
80 /* Automatically included by modules that need a replacement for close. */
82 # define close rpl_close
83 extern int close (int);
90 /* Copy the file descriptor OLDFD into file descriptor NEWFD. Do nothing if
91 NEWFD = OLDFD, otherwise close NEWFD first if it is open.
92 Return 0 if successful, otherwise -1 and errno set.
93 See the POSIX:2001 specification
94 <http://www.opengroup.org/susv3xsh/dup2.html>. */
95 extern int dup2 (int oldfd, int newfd);
97 #elif defined GNULIB_POSIXCHECK
100 (GL_LINK_WARNING ("dup2 is unportable - " \
101 "use gnulib module dup2 for portability"), \
107 # if !@HAVE_DECL_ENVIRON@
108 /* Set of environment variables and values. An array of strings of the form
109 "VARIABLE=VALUE", terminated with a NULL. */
110 # if defined __APPLE__ && defined __MACH__
111 # include <crt_externs.h>
112 # define environ (*_NSGetEnviron ())
114 extern char **environ;
117 #elif defined GNULIB_POSIXCHECK
120 (GL_LINK_WARNING ("environ is unportable - " \
121 "use gnulib module environ for portability"), \
127 # if @REPLACE_FCHDIR@
129 /* Change the process' current working directory to the directory on which
130 the given file descriptor is open.
131 Return 0 if successful, otherwise -1 and errno set.
132 See the POSIX:2001 specification
133 <http://www.opengroup.org/susv3xsh/fchdir.html>. */
134 extern int fchdir (int /*fd*/);
137 extern int dup (int);
138 # define dup2 rpl_dup2
139 extern int dup2 (int, int);
142 #elif defined GNULIB_POSIXCHECK
145 (GL_LINK_WARNING ("fchdir is unportable - " \
146 "use gnulib module fchdir for portability"), \
152 /* Synchronize changes to a file.
153 Return 0 if successful, otherwise -1 and errno set.
154 See POSIX:2001 specification
155 <http://www.opengroup.org/susv3xsh/fsync.html>. */
157 extern int fsync (int fd);
159 #elif defined GNULIB_POSIXCHECK
162 (GL_LINK_WARNING ("fsync is unportable - " \
163 "use gnulib module fsync for portability"), \
168 #if @GNULIB_FTRUNCATE@
169 # if !@HAVE_FTRUNCATE@
170 /* Change the size of the file to which FD is opened to become equal to LENGTH.
171 Return 0 if successful, otherwise -1 and errno set.
172 See the POSIX:2001 specification
173 <http://www.opengroup.org/susv3xsh/ftruncate.html>. */
174 extern int ftruncate (int fd, off_t length);
176 #elif defined GNULIB_POSIXCHECK
178 # define ftruncate(f,l) \
179 (GL_LINK_WARNING ("ftruncate is unportable - " \
180 "use gnulib module ftruncate for portability"), \
186 /* Include the headers that might declare getcwd so that they will not
187 cause confusion if included after this file. */
189 # if @REPLACE_GETCWD@
190 /* Get the name of the current working directory, and put it in SIZE bytes
192 Return BUF if successful, or NULL if the directory couldn't be determined
193 or SIZE was too small.
194 See the POSIX:2001 specification
195 <http://www.opengroup.org/susv3xsh/getcwd.html>.
196 Additionally, the gnulib module 'getcwd' guarantees the following GNU
197 extension: If BUF is NULL, an array is allocated with 'malloc'; the array
198 is SIZE bytes long, unless SIZE == 0, in which case it is as big as
200 # define getcwd rpl_getcwd
201 extern char * getcwd (char *buf, size_t size);
203 #elif defined GNULIB_POSIXCHECK
205 # define getcwd(b,s) \
206 (GL_LINK_WARNING ("getcwd is unportable - " \
207 "use gnulib module getcwd for portability"), \
212 #if @GNULIB_GETDTABLESIZE@
213 # if !@HAVE_GETDTABLESIZE@
214 /* Return the maximum number of file descriptors in the current process. */
215 extern int getdtablesize (void);
217 #elif defined GNULIB_POSIXCHECK
218 # undef getdtablesize
219 # define getdtablesize() \
220 (GL_LINK_WARNING ("getdtablesize is unportable - " \
221 "use gnulib module getdtablesize for portability"), \
226 #if @GNULIB_GETLOGIN_R@
227 /* Copies the user's login name to NAME.
228 The array pointed to by NAME has room for SIZE bytes.
230 Returns 0 if successful. Upon error, an error number is returned, or -1 in
231 the case that the login name cannot be found but no specific error is
232 provided (this case is hopefully rare but is left open by the POSIX spec).
234 See <http://www.opengroup.org/susv3xsh/getlogin.html>.
236 # if !@HAVE_DECL_GETLOGIN_R@
238 extern int getlogin_r (char *name, size_t size);
240 #elif defined GNULIB_POSIXCHECK
242 # define getlogin_r(n,s) \
243 (GL_LINK_WARNING ("getlogin_r is unportable - " \
244 "use gnulib module getlogin_r for portability"), \
249 #if @GNULIB_GETPAGESIZE@
250 # if @REPLACE_GETPAGESIZE@
251 # define getpagesize rpl_getpagesize
252 extern int getpagesize (void);
253 # elif !@HAVE_GETPAGESIZE@
254 /* This is for POSIX systems. */
255 # if !defined getpagesize && defined _SC_PAGESIZE
256 # if ! (defined __VMS && __VMS_VER < 70000000)
257 # define getpagesize() sysconf (_SC_PAGESIZE)
260 /* This is for older VMS. */
261 # if !defined getpagesize && defined __VMS
263 # define getpagesize() 8192
265 # define getpagesize() 512
268 /* This is for BeOS. */
269 # if !defined getpagesize && @HAVE_OS_H@
271 # if defined B_PAGE_SIZE
272 # define getpagesize() B_PAGE_SIZE
275 /* This is for AmigaOS4.0. */
276 # if !defined getpagesize && defined __amigaos4__
277 # define getpagesize() 2048
279 /* This is for older Unix systems. */
280 # if !defined getpagesize && @HAVE_SYS_PARAM_H@
281 # include <sys/param.h>
282 # ifdef EXEC_PAGESIZE
283 # define getpagesize() EXEC_PAGESIZE
289 # define getpagesize() (NBPG * CLSIZE)
292 # define getpagesize() NBPC
298 #elif defined GNULIB_POSIXCHECK
300 # define getpagesize() \
301 (GL_LINK_WARNING ("getpagesize is unportable - " \
302 "use gnulib module getpagesize for portability"), \
308 # if @REPLACE_LCHOWN@
309 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
310 to GID (if GID is not -1). Do not follow symbolic links.
311 Return 0 if successful, otherwise -1 and errno set.
312 See the POSIX:2001 specification
313 <http://www.opengroup.org/susv3xsh/lchown.html>. */
314 # define lchown rpl_lchown
315 extern int lchown (char const *file, uid_t owner, gid_t group);
317 #elif defined GNULIB_POSIXCHECK
319 # define lchown(f,u,g) \
320 (GL_LINK_WARNING ("lchown is unportable to pre-POSIX.1-2001 " \
321 "systems - use gnulib module lchown for portability"), \
328 /* Set the offset of FD relative to SEEK_SET, SEEK_CUR, or SEEK_END.
329 Return the new offset if successful, otherwise -1 and errno set.
330 See the POSIX:2001 specification
331 <http://www.opengroup.org/susv3xsh/lseek.html>. */
332 # define lseek rpl_lseek
333 extern off_t lseek (int fd, off_t offset, int whence);
335 #elif defined GNULIB_POSIXCHECK
337 # define lseek(f,o,w) \
338 (GL_LINK_WARNING ("lseek does not fail with ESPIPE on pipes on some " \
339 "systems - use gnulib module lseek for portability"), \
344 #if @GNULIB_READLINK@
345 /* Read the contents of the symbolic link FILE and place the first BUFSIZE
346 bytes of it into BUF. Return the number of bytes placed into BUF if
347 successful, otherwise -1 and errno set.
348 See the POSIX:2001 specification
349 <http://www.opengroup.org/susv3xsh/readlink.html>. */
350 # if !@HAVE_READLINK@
352 extern int readlink (const char *file, char *buf, size_t bufsize);
354 #elif defined GNULIB_POSIXCHECK
356 # define readlink(f,b,s) \
357 (GL_LINK_WARNING ("readlink is unportable - " \
358 "use gnulib module readlink for portability"), \
364 /* Pause the execution of the current thread for N seconds.
365 Returns the number of seconds left to sleep.
366 See the POSIX:2001 specification
367 <http://www.opengroup.org/susv3xsh/sleep.html>. */
369 extern unsigned int sleep (unsigned int n);
371 #elif defined GNULIB_POSIXCHECK
374 (GL_LINK_WARNING ("sleep is unportable - " \
375 "use gnulib module sleep for portability"), \
380 #if @GNULIB_WRITE@ && @REPLACE_WRITE@ && @GNULIB_UNISTD_H_SIGPIPE@
381 /* Write up to COUNT bytes starting at BUF to file descriptor FD.
382 See the POSIX:2001 specification
383 <http://www.opengroup.org/susv3xsh/write.html>. */
385 # define write rpl_write
386 extern ssize_t write (int fd, const void *buf, size_t count);
390 #ifdef FCHDIR_REPLACEMENT
391 /* gnulib internal function. */
392 extern void _gl_unregister_fd (int fd);
401 #endif /* _GL_UNISTD_H */
402 #endif /* _GL_UNISTD_H */