1/* Substitute for and wrapper around <unistd.h>. 2 Copyright (C) 2004-2007 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 2, or (at your option) 7 any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU 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#ifndef _GL_UNISTD_H 19 20/* The include_next requires a split double-inclusion guard. */ 21#if @HAVE_UNISTD_H@ 22# @INCLUDE_NEXT@ @NEXT_UNISTD_H@ 23#endif 24 25#ifndef _GL_UNISTD_H 26#define _GL_UNISTD_H 27 28/* mingw doesn't define the SEEK_* macros in <unistd.h>. */ 29#if !(defined SEEK_CUR && defined SEEK_END && defined SEEK_SET) 30# include <stdio.h> 31#endif 32 33/* mingw fails to declare _exit in <unistd.h>. */ 34#include <stdlib.h> 35 36/* The definition of GL_LINK_WARNING is copied here. */ 37 38 39/* Declare overridden functions. */ 40 41#ifdef __cplusplus 42extern "C" { 43#endif 44 45 46#if @GNULIB_CHOWN@ 47# if @REPLACE_CHOWN@ 48# ifndef REPLACE_CHOWN 49# define REPLACE_CHOWN 1 50# endif 51# if REPLACE_CHOWN 52/* Change the owner of FILE to UID (if UID is not -1) and the group of FILE 53 to GID (if GID is not -1). Follow symbolic links. 54 Return 0 if successful, otherwise -1 and errno set. 55 See the POSIX:2001 specification 56 <http://www.opengroup.org/susv3xsh/chown.html>. */ 57# define chown rpl_chown 58extern int chown (const char *file, uid_t uid, gid_t gid); 59# endif 60# endif 61#elif defined GNULIB_POSIXCHECK 62# undef chown 63# define chown(f,u,g) \ 64 (GL_LINK_WARNING ("chown fails to follow symlinks on some systems and " \ 65 "doesn't treat a uid or gid of -1 on some systems - " \ 66 "use gnulib module chown for portability"), \ 67 chown (f, u, g)) 68#endif 69 70 71#if @GNULIB_DUP2@ 72# if !@HAVE_DUP2@ 73/* Copy the file descriptor OLDFD into file descriptor NEWFD. Do nothing if 74 NEWFD = OLDFD, otherwise close NEWFD first if it is open. 75 Return 0 if successful, otherwise -1 and errno set. 76 See the POSIX:2001 specification 77 <http://www.opengroup.org/susv3xsh/dup2.html>. */ 78extern int dup2 (int oldfd, int newfd); 79# endif 80#elif defined GNULIB_POSIXCHECK 81# undef dup2 82# define dup2(o,n) \ 83 (GL_LINK_WARNING ("dup2 is unportable - " \ 84 "use gnulib module dup2 for portability"), \ 85 dup2 (o, n)) 86#endif 87 88 89#if @GNULIB_FCHDIR@ 90# if @REPLACE_FCHDIR@ 91 92/* Change the process' current working directory to the directory on which 93 the given file descriptor is open. 94 Return 0 if successful, otherwise -1 and errno set. 95 See the POSIX:2001 specification 96 <http://www.opengroup.org/susv3xsh/fchdir.html>. */ 97extern int fchdir (int /*fd*/); 98 99# define close rpl_close 100extern int close (int); 101# define dup rpl_dup 102extern int dup (int); 103# define dup2 rpl_dup2 104extern int dup2 (int, int); 105 106# endif 107#elif defined GNULIB_POSIXCHECK 108# undef fchdir 109# define fchdir(f) \ 110 (GL_LINK_WARNING ("fchdir is unportable - " \ 111 "use gnulib module fchdir for portability"), \ 112 fchdir (f)) 113#endif 114 115 116#if @GNULIB_FTRUNCATE@ 117# if !@HAVE_FTRUNCATE@ 118/* Change the size of the file to which FD is opened to become equal to LENGTH. 119 Return 0 if successful, otherwise -1 and errno set. 120 See the POSIX:2001 specification 121 <http://www.opengroup.org/susv3xsh/ftruncate.html>. */ 122extern int ftruncate (int fd, off_t length); 123# endif 124#elif defined GNULIB_POSIXCHECK 125# undef ftruncate 126# define ftruncate(f,l) \ 127 (GL_LINK_WARNING ("ftruncate is unportable - " \ 128 "use gnulib module ftruncate for portability"), \ 129 ftruncate (f, l)) 130#endif 131 132 133#if @GNULIB_GETCWD@ 134/* Include the headers that might declare getcwd so that they will not 135 cause confusion if included after this file. */ 136# include <stdlib.h> 137# if @REPLACE_GETCWD@ 138/* Get the name of the current working directory, and put it in SIZE bytes 139 of BUF. 140 Return BUF if successful, or NULL if the directory couldn't be determined 141 or SIZE was too small. 142 See the POSIX:2001 specification 143 <http://www.opengroup.org/susv3xsh/getcwd.html>. 144 Additionally, the gnulib module 'getcwd' guarantees the following GNU 145 extension: If BUF is NULL, an array is allocated with 'malloc'; the array 146 is SIZE bytes long, unless SIZE == 0, in which case it is as big as 147 necessary. */ 148# define getcwd rpl_getcwd 149extern char * getcwd (char *buf, size_t size); 150# endif 151#elif defined GNULIB_POSIXCHECK 152# undef getcwd 153# define getcwd(b,s) \ 154 (GL_LINK_WARNING ("getcwd is unportable - " \ 155 "use gnulib module getcwd for portability"), \ 156 getcwd (b, s)) 157#endif 158 159 160#if @GNULIB_GETLOGIN_R@ 161/* Copies the user's login name to NAME. 162 The array pointed to by NAME has room for SIZE bytes. 163 164 Returns 0 if successful. Upon error, an error number is returned, or -1 in 165 the case that the login name cannot be found but no specific error is 166 provided (this case is hopefully rare but is left open by the POSIX spec). 167 168 See <http://www.opengroup.org/susv3xsh/getlogin.html>. 169 */ 170# if !@HAVE_DECL_GETLOGIN_R@ 171# include <stddef.h> 172extern int getlogin_r (char *name, size_t size); 173# endif 174#elif defined GNULIB_POSIXCHECK 175# undef getlogin_r 176# define getlogin_r(n,s) \ 177 (GL_LINK_WARNING ("getlogin_r is unportable - " \ 178 "use gnulib module getlogin_r for portability"), \ 179 getlogin_r (n, s)) 180#endif 181 182 183#if @GNULIB_LCHOWN@ 184# if @REPLACE_LCHOWN@ 185/* Change the owner of FILE to UID (if UID is not -1) and the group of FILE 186 to GID (if GID is not -1). Do not follow symbolic links. 187 Return 0 if successful, otherwise -1 and errno set. 188 See the POSIX:2001 specification 189 <http://www.opengroup.org/susv3xsh/lchown.html>. */ 190# define lchown rpl_lchown 191extern int lchown (char const *file, uid_t owner, gid_t group); 192# endif 193#elif defined GNULIB_POSIXCHECK 194# undef lchown 195# define lchown(f,u,g) \ 196 (GL_LINK_WARNING ("lchown is unportable to pre-POSIX.1-2001 " \ 197 "systems - use gnulib module lchown for portability"), \ 198 lchown (f, u, g)) 199#endif 200 201 202#if @GNULIB_LSEEK@ 203# if @REPLACE_LSEEK@ 204/* Set the offset of FD relative to SEEK_SET, SEEK_CUR, or SEEK_END. 205 Return the new offset if successful, otherwise -1 and errno set. 206 See the POSIX:2001 specification 207 <http://www.opengroup.org/susv3xsh/lseek.html>. */ 208# define lseek rpl_lseek 209 extern off_t lseek (int fd, off_t offset, int whence); 210# endif 211#elif defined GNULIB_POSIXCHECK 212# undef lseek 213# define lseek(f,o,w) \ 214 (GL_LINK_WARNING ("lseek does not fail with ESPIPE on pipes on some " \ 215 "systems - use gnulib module lseek for portability"), \ 216 lseek (f, o, w)) 217#endif 218 219 220#if @GNULIB_READLINK@ 221/* Read the contents of the symbolic link FILE and place the first BUFSIZE 222 bytes of it into BUF. Return the number of bytes placed into BUF if 223 successful, otherwise -1 and errno set. 224 See the POSIX:2001 specification 225 <http://www.opengroup.org/susv3xsh/readlink.html>. */ 226# if !@HAVE_READLINK@ 227# include <stddef.h> 228extern int readlink (const char *file, char *buf, size_t bufsize); 229# endif 230#elif defined GNULIB_POSIXCHECK 231# undef readlink 232# define readlink(f,b,s) \ 233 (GL_LINK_WARNING ("readlink is unportable - " \ 234 "use gnulib module readlink for portability"), \ 235 readlink (f, b, s)) 236#endif 237 238 239#if @GNULIB_SLEEP@ 240/* Pause the execution of the current thread for N seconds. 241 Returns the number of seconds left to sleep. 242 See the POSIX:2001 specification 243 <http://www.opengroup.org/susv3xsh/sleep.html>. */ 244# if !@HAVE_SLEEP@ 245extern unsigned int sleep (unsigned int n); 246# endif 247#elif defined GNULIB_POSIXCHECK 248# undef sleep 249# define sleep(n) \ 250 (GL_LINK_WARNING ("sleep is unportable - " \ 251 "use gnulib module sleep for portability"), \ 252 sleep (n)) 253#endif 254 255 256#ifdef __cplusplus 257} 258#endif 259 260 261#endif /* _GL_UNISTD_H */ 262#endif /* _GL_UNISTD_H */ 263