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 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#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_GETPAGESIZE@ 184# if !@HAVE_GETPAGESIZE@ 185/* This is for POSIX systems. */ 186# if !defined getpagesize && defined _SC_PAGESIZE 187# if ! (defined __VMS && __VMS_VER < 70000000) 188# define getpagesize() sysconf (_SC_PAGESIZE) 189# endif 190# endif 191/* This is for older VMS. */ 192# if !defined getpagesize && defined __VMS 193# ifdef __ALPHA 194# define getpagesize() 8192 195# else 196# define getpagesize() 512 197# endif 198# endif 199/* This is for BeOS. */ 200# if !defined getpagesize && @HAVE_OS_H@ 201# include <OS.h> 202# if defined B_PAGE_SIZE 203# define getpagesize() B_PAGE_SIZE 204# endif 205# endif 206/* This is for AmigaOS4.0. */ 207# if !defined getpagesize && defined __amigaos4__ 208# define getpagesize() 2048 209# endif 210/* This is for older Unix systems. */ 211# if !defined getpagesize && @HAVE_SYS_PARAM_H@ 212# include <sys/param.h> 213# ifdef EXEC_PAGESIZE 214# define getpagesize() EXEC_PAGESIZE 215# else 216# ifdef NBPG 217# ifndef CLSIZE 218# define CLSIZE 1 219# endif 220# define getpagesize() (NBPG * CLSIZE) 221# else 222# ifdef NBPC 223# define getpagesize() NBPC 224# endif 225# endif 226# endif 227# endif 228# endif 229#elif defined GNULIB_POSIXCHECK 230# undef getpagesize 231# define getpagesize() \ 232 (GL_LINK_WARNING ("getpagesize is unportable - " \ 233 "use gnulib module getpagesize for portability"), \ 234 getpagesize ()) 235#endif 236 237 238#if @GNULIB_LCHOWN@ 239# if @REPLACE_LCHOWN@ 240/* Change the owner of FILE to UID (if UID is not -1) and the group of FILE 241 to GID (if GID is not -1). Do not follow symbolic links. 242 Return 0 if successful, otherwise -1 and errno set. 243 See the POSIX:2001 specification 244 <http://www.opengroup.org/susv3xsh/lchown.html>. */ 245# define lchown rpl_lchown 246extern int lchown (char const *file, uid_t owner, gid_t group); 247# endif 248#elif defined GNULIB_POSIXCHECK 249# undef lchown 250# define lchown(f,u,g) \ 251 (GL_LINK_WARNING ("lchown is unportable to pre-POSIX.1-2001 " \ 252 "systems - use gnulib module lchown for portability"), \ 253 lchown (f, u, g)) 254#endif 255 256 257#if @GNULIB_LSEEK@ 258# if @REPLACE_LSEEK@ 259/* Set the offset of FD relative to SEEK_SET, SEEK_CUR, or SEEK_END. 260 Return the new offset if successful, otherwise -1 and errno set. 261 See the POSIX:2001 specification 262 <http://www.opengroup.org/susv3xsh/lseek.html>. */ 263# define lseek rpl_lseek 264 extern off_t lseek (int fd, off_t offset, int whence); 265# endif 266#elif defined GNULIB_POSIXCHECK 267# undef lseek 268# define lseek(f,o,w) \ 269 (GL_LINK_WARNING ("lseek does not fail with ESPIPE on pipes on some " \ 270 "systems - use gnulib module lseek for portability"), \ 271 lseek (f, o, w)) 272#endif 273 274 275#if @GNULIB_READLINK@ 276/* Read the contents of the symbolic link FILE and place the first BUFSIZE 277 bytes of it into BUF. Return the number of bytes placed into BUF if 278 successful, otherwise -1 and errno set. 279 See the POSIX:2001 specification 280 <http://www.opengroup.org/susv3xsh/readlink.html>. */ 281# if !@HAVE_READLINK@ 282# include <stddef.h> 283extern int readlink (const char *file, char *buf, size_t bufsize); 284# endif 285#elif defined GNULIB_POSIXCHECK 286# undef readlink 287# define readlink(f,b,s) \ 288 (GL_LINK_WARNING ("readlink is unportable - " \ 289 "use gnulib module readlink for portability"), \ 290 readlink (f, b, s)) 291#endif 292 293 294#if @GNULIB_SLEEP@ 295/* Pause the execution of the current thread for N seconds. 296 Returns the number of seconds left to sleep. 297 See the POSIX:2001 specification 298 <http://www.opengroup.org/susv3xsh/sleep.html>. */ 299# if !@HAVE_SLEEP@ 300extern unsigned int sleep (unsigned int n); 301# endif 302#elif defined GNULIB_POSIXCHECK 303# undef sleep 304# define sleep(n) \ 305 (GL_LINK_WARNING ("sleep is unportable - " \ 306 "use gnulib module sleep for portability"), \ 307 sleep (n)) 308#endif 309 310 311#ifdef __cplusplus 312} 313#endif 314 315 316#endif /* _GL_UNISTD_H */ 317#endif /* _GL_UNISTD_H */ 318