1 /* Substitute for and wrapper around <unistd.h>.
2 Copyright (C) 2004-2007 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 /* The include_next requires a split double-inclusion guard. */
22 # if @HAVE_INCLUDE_NEXT@
23 # include_next <unistd.h>
25 # include @ABSOLUTE_UNISTD_H@
32 /* mingw doesn't define the SEEK_* macros in <unistd.h>. */
33 #if !(defined SEEK_CUR && defined SEEK_END && defined SEEK_SET)
37 /* mingw fails to declare _exit in <unistd.h>. */
40 /* The definition of GL_LINK_WARNING is copied here. */
43 /* Declare overridden functions. */
52 # ifndef REPLACE_CHOWN
53 # define REPLACE_CHOWN 1
56 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
57 to GID (if GID is not -1). Follow symbolic links.
58 Return 0 if successful, otherwise -1 and errno set.
59 See the POSIX:2001 specification
60 <http://www.opengroup.org/susv3xsh/chown.html>. */
61 # define chown rpl_chown
62 extern int chown (const char *file, uid_t uid, gid_t gid);
65 #elif defined GNULIB_POSIXCHECK
67 # define chown(f,u,g) \
68 (GL_LINK_WARNING ("chown fails to follow symlinks on some systems and " \
69 "doesn't treat a uid or gid of -1 on some systems - " \
70 "use gnulib module chown for portability"), \
77 /* Copy the file descriptor OLDFD into file descriptor NEWFD. Do nothing if
78 NEWFD = OLDFD, otherwise close NEWFD first if it is open.
79 Return 0 if successful, otherwise -1 and errno set.
80 See the POSIX:2001 specification
81 <http://www.opengroup.org/susv3xsh/dup2.html>. */
82 extern int dup2 (int oldfd, int newfd);
84 #elif defined GNULIB_POSIXCHECK
87 (GL_LINK_WARNING ("dup2 is unportable - " \
88 "use gnulib module dup2 for portability"), \
96 /* Change the process' current working directory to the directory on which
97 the given file descriptor is open.
98 Return 0 if successful, otherwise -1 and errno set.
99 See the POSIX:2001 specification
100 <http://www.opengroup.org/susv3xsh/fchdir.html>. */
101 extern int fchdir (int /*fd*/);
103 # define close rpl_close
104 extern int close (int);
106 extern int dup (int);
107 # define dup2 rpl_dup2
108 extern int dup2 (int, int);
111 #elif defined GNULIB_POSIXCHECK
114 (GL_LINK_WARNING ("fchdir is unportable - " \
115 "use gnulib module fchdir for portability"), \
120 #if @GNULIB_FTRUNCATE@
121 # if !@HAVE_FTRUNCATE@
122 /* Change the size of the file to which FD is opened to become equal to LENGTH.
123 Return 0 if successful, otherwise -1 and errno set.
124 See the POSIX:2001 specification
125 <http://www.opengroup.org/susv3xsh/ftruncate.html>. */
126 extern int ftruncate (int fd, off_t length);
128 #elif defined GNULIB_POSIXCHECK
130 # define ftruncate(f,l) \
131 (GL_LINK_WARNING ("ftruncate is unportable - " \
132 "use gnulib module ftruncate for portability"), \
138 /* Include the headers that might declare getcwd so that they will not
139 cause confusion if included after this file. */
141 # if @REPLACE_GETCWD@
142 /* Get the name of the current working directory, and put it in SIZE bytes
144 Return BUF if successful, or NULL if the directory couldn't be determined
145 or SIZE was too small.
146 See the POSIX:2001 specification
147 <http://www.opengroup.org/susv3xsh/getcwd.html>.
148 Additionally, the gnulib module 'getcwd' guarantees the following GNU
149 extension: If BUF is NULL, an array is allocated with 'malloc'; the array
150 is SIZE bytes long, unless SIZE == 0, in which case it is as big as
152 # define getcwd rpl_getcwd
153 extern char * getcwd (char *buf, size_t size);
155 #elif defined GNULIB_POSIXCHECK
157 # define getcwd(b,s) \
158 (GL_LINK_WARNING ("getcwd is unportable - " \
159 "use gnulib module getcwd for portability"), \
164 #if @GNULIB_GETLOGIN_R@
165 /* Copies the user's login name to NAME.
166 The array pointed to by NAME has room for SIZE bytes.
168 Returns 0 if successful. Upon error, an error number is returned, or -1 in
169 the case that the login name cannot be found but no specific error is
170 provided (this case is hopefully rare but is left open by the POSIX spec).
172 See <http://www.opengroup.org/susv3xsh/getlogin.html>.
174 # if !@HAVE_DECL_GETLOGIN_R@
176 extern int getlogin_r (char *name, size_t size);
178 #elif defined GNULIB_POSIXCHECK
180 # define getlogin_r(n,s) \
181 (GL_LINK_WARNING ("getlogin_r is unportable - " \
182 "use gnulib module getlogin_r for portability"), \
188 # if @REPLACE_LCHOWN@
189 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
190 to GID (if GID is not -1). Do not follow symbolic links.
191 Return 0 if successful, otherwise -1 and errno set.
192 See the POSIX:2001 specification
193 <http://www.opengroup.org/susv3xsh/lchown.html>. */
194 # define lchown rpl_lchown
195 extern int lchown (char const *file, uid_t owner, gid_t group);
197 #elif defined GNULIB_POSIXCHECK
199 # define lchown(f,u,g) \
200 (GL_LINK_WARNING ("lchown is unportable to pre-POSIX.1-2001 " \
201 "systems - use gnulib module lchown for portability"), \
208 /* Set the offset of FD relative to SEEK_SET, SEEK_CUR, or SEEK_END.
209 Return the new offset if successful, otherwise -1 and errno set.
210 See the POSIX:2001 specification
211 <http://www.opengroup.org/susv3xsh/lseek.html>. */
212 # define lseek rpl_lseek
213 extern off_t lseek (int fd, off_t offset, int whence);
215 #elif defined GNULIB_POSIXCHECK
217 # define lseek(f,o,w) \
218 (GL_LINK_WARNING ("lseek does not fail with ESPIPE on pipes on some " \
219 "systems - use gnulib module lseek for portability"), \
224 #if @GNULIB_READLINK@
225 /* Read the contents of the symbolic link FILE and place the first BUFSIZE
226 bytes of it into BUF. Return the number of bytes placed into BUF if
227 successful, otherwise -1 and errno set.
228 See the POSIX:2001 specification
229 <http://www.opengroup.org/susv3xsh/readlink.html>. */
230 # if !@HAVE_READLINK@
232 extern int readlink (const char *file, char *buf, size_t bufsize);
234 #elif defined GNULIB_POSIXCHECK
236 # define readlink(f,b,s) \
237 (GL_LINK_WARNING ("readlink is unportable - " \
238 "use gnulib module readlink for portability"), \
244 /* Pause the execution of the current thread for N seconds.
245 Returns the number of seconds left to sleep.
246 See the POSIX:2001 specification
247 <http://www.opengroup.org/susv3xsh/sleep.html>. */
249 extern unsigned int sleep (unsigned int n);
251 #elif defined GNULIB_POSIXCHECK
254 (GL_LINK_WARNING ("sleep is unportable - " \
255 "use gnulib module sleep for portability"), \
265 #endif /* _GL_UNISTD_H */
266 #endif /* _GL_UNISTD_H */