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272
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1 /* Substitute for and wrapper around <unistd.h>.
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2 Copyright (C) 2003-2008 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software Foundation,
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16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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17
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18 #ifndef _GL_UNISTD_H
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19
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20 #if __GNUC__ >= 3
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21 @PRAGMA_SYSTEM_HEADER@
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22 #endif
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23
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24 /* The include_next requires a split double-inclusion guard. */
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25 #if @HAVE_UNISTD_H@
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26 # @INCLUDE_NEXT@ @NEXT_UNISTD_H@
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27 #endif
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28
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29 #ifndef _GL_UNISTD_H
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30 #define _GL_UNISTD_H
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31
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32 /* mingw doesn't define the SEEK_* macros in <unistd.h>. */
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33 #if !(defined SEEK_CUR && defined SEEK_END && defined SEEK_SET)
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34 # include <stdio.h>
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35 #endif
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36
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37 /* mingw fails to declare _exit in <unistd.h>. */
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38 /* mingw, BeOS, Haiku declare environ in <stdlib.h>, not in <unistd.h>. */
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39 #include <stdlib.h>
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40
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41 #if @GNULIB_WRITE@ && @REPLACE_WRITE@ && @GNULIB_UNISTD_H_SIGPIPE@
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42 /* Get ssize_t. */
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43 # include <sys/types.h>
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44 #endif
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45
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46 #if @GNULIB_GETHOSTNAME@
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47 /* Get all possible declarations of gethostname(). */
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48 # if @UNISTD_H_HAVE_WINSOCK2_H@
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49 # include <winsock2.h>
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50 # if !defined _GL_SYS_SOCKET_H
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51 # undef socket
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52 # define socket socket_used_without_including_sys_socket_h
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53 # undef connect
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54 # define connect connect_used_without_including_sys_socket_h
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55 # undef accept
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56 # define accept accept_used_without_including_sys_socket_h
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57 # undef bind
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58 # define bind bind_used_without_including_sys_socket_h
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59 # undef getpeername
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60 # define getpeername getpeername_used_without_including_sys_socket_h
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61 # undef getsockname
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62 # define getsockname getsockname_used_without_including_sys_socket_h
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63 # undef getsockopt
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64 # define getsockopt getsockopt_used_without_including_sys_socket_h
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65 # undef listen
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66 # define listen listen_used_without_including_sys_socket_h
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67 # undef recv
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68 # define recv recv_used_without_including_sys_socket_h
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69 # undef send
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70 # define send send_used_without_including_sys_socket_h
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71 # undef recvfrom
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72 # define recvfrom recvfrom_used_without_including_sys_socket_h
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73 # undef sendto
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74 # define sendto sendto_used_without_including_sys_socket_h
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75 # undef setsockopt
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76 # define setsockopt setsockopt_used_without_including_sys_socket_h
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77 # undef shutdown
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78 # define shutdown shutdown_used_without_including_sys_socket_h
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79 # endif
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80 # if !defined _GL_SYS_SELECT_H
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81 # undef select
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82 # define select select_used_without_including_sys_select_h
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83 # endif
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84 # endif
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85 #endif
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86
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87 /* The definition of GL_LINK_WARNING is copied here. */
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88
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89
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90 /* Declare overridden functions. */
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91
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92 #ifdef __cplusplus
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93 extern "C" {
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94 #endif
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95
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96
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97 #if @GNULIB_CHOWN@
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98 # if @REPLACE_CHOWN@
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99 # ifndef REPLACE_CHOWN
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100 # define REPLACE_CHOWN 1
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101 # endif
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102 # if REPLACE_CHOWN
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103 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
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104 to GID (if GID is not -1). Follow symbolic links.
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105 Return 0 if successful, otherwise -1 and errno set.
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106 See the POSIX:2001 specification
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107 <http://www.opengroup.org/susv3xsh/chown.html>. */
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108 # define chown rpl_chown
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109 extern int chown (const char *file, uid_t uid, gid_t gid);
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110 # endif
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111 # endif
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112 #elif defined GNULIB_POSIXCHECK
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113 # undef chown
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114 # define chown(f,u,g) \
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115 (GL_LINK_WARNING ("chown fails to follow symlinks on some systems and " \
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116 "doesn't treat a uid or gid of -1 on some systems - " \
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117 "use gnulib module chown for portability"), \
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118 chown (f, u, g))
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119 #endif
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120
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121
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122 #if @GNULIB_CLOSE@
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123 # if @UNISTD_H_HAVE_WINSOCK2_H@
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124 /* Need a gnulib internal function. */
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125 # define HAVE__GL_CLOSE_FD_MAYBE_SOCKET 1
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126 # endif
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127 # if @REPLACE_CLOSE@
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128 /* Automatically included by modules that need a replacement for close. */
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129 # undef close
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130 # define close rpl_close
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131 extern int close (int);
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132 # endif
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133 #elif @UNISTD_H_HAVE_WINSOCK2_H@
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134 # undef close
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135 # define close close_used_without_requesting_gnulib_module_close
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136 #elif defined GNULIB_POSIXCHECK
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137 # undef close
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138 # define close(f) \
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139 (GL_LINK_WARNING ("close does not portably work on sockets - " \
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140 "use gnulib module close for portability"), \
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141 close (f))
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142 #endif
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143
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144
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145 #if @GNULIB_DUP2@
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146 # if !@HAVE_DUP2@
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147 /* Copy the file descriptor OLDFD into file descriptor NEWFD. Do nothing if
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148 NEWFD = OLDFD, otherwise close NEWFD first if it is open.
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149 Return 0 if successful, otherwise -1 and errno set.
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150 See the POSIX:2001 specification
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151 <http://www.opengroup.org/susv3xsh/dup2.html>. */
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152 extern int dup2 (int oldfd, int newfd);
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153 # endif
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154 #elif defined GNULIB_POSIXCHECK
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155 # undef dup2
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156 # define dup2(o,n) \
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157 (GL_LINK_WARNING ("dup2 is unportable - " \
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158 "use gnulib module dup2 for portability"), \
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159 dup2 (o, n))
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160 #endif
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161
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162
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163 #if @GNULIB_ENVIRON@
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164 # if !@HAVE_DECL_ENVIRON@
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165 /* Set of environment variables and values. An array of strings of the form
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166 "VARIABLE=VALUE", terminated with a NULL. */
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167 # if defined __APPLE__ && defined __MACH__
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168 # include <crt_externs.h>
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169 # define environ (*_NSGetEnviron ())
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170 # else
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171 extern char **environ;
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172 # endif
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173 # endif
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174 #elif defined GNULIB_POSIXCHECK
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175 # undef environ
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176 # define environ \
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177 (GL_LINK_WARNING ("environ is unportable - " \
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178 "use gnulib module environ for portability"), \
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179 environ)
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180 #endif
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181
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182
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183 #if @GNULIB_EUIDACCESS@
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184 # if !@HAVE_EUIDACCESS@
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185 /* Like access(), except that is uses the effective user id and group id of
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186 the current process. */
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187 extern int euidaccess (const char *filename, int mode);
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188 # endif
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189 #elif defined GNULIB_POSIXCHECK
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190 # undef euidaccess
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191 # define euidaccess(f,m) \
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192 (GL_LINK_WARNING ("euidaccess is unportable - " \
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193 "use gnulib module euidaccess for portability"), \
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194 euidaccess (f, m))
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195 #endif
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196
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197
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198 #if @GNULIB_FCHDIR@
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199 # if @REPLACE_FCHDIR@
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200
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201 /* Change the process' current working directory to the directory on which
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202 the given file descriptor is open.
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203 Return 0 if successful, otherwise -1 and errno set.
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204 See the POSIX:2001 specification
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205 <http://www.opengroup.org/susv3xsh/fchdir.html>. */
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206 extern int fchdir (int /*fd*/);
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207
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208 # define dup rpl_dup
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209 extern int dup (int);
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210 # define dup2 rpl_dup2
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211 extern int dup2 (int, int);
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212
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213 # endif
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214 #elif defined GNULIB_POSIXCHECK
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215 # undef fchdir
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216 # define fchdir(f) \
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217 (GL_LINK_WARNING ("fchdir is unportable - " \
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218 "use gnulib module fchdir for portability"), \
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219 fchdir (f))
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220 #endif
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221
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222
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223 #if @GNULIB_FSYNC@
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224 /* Synchronize changes to a file.
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225 Return 0 if successful, otherwise -1 and errno set.
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226 See POSIX:2001 specification
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227 <http://www.opengroup.org/susv3xsh/fsync.html>. */
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228 # if !@HAVE_FSYNC@
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229 extern int fsync (int fd);
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230 # endif
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231 #elif defined GNULIB_POSIXCHECK
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232 # undef fsync
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233 # define fsync(fd) \
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234 (GL_LINK_WARNING ("fsync is unportable - " \
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235 "use gnulib module fsync for portability"), \
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236 fsync (fd))
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237 #endif
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238
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239
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240 #if @GNULIB_FTRUNCATE@
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241 # if !@HAVE_FTRUNCATE@
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242 /* Change the size of the file to which FD is opened to become equal to LENGTH.
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243 Return 0 if successful, otherwise -1 and errno set.
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244 See the POSIX:2001 specification
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245 <http://www.opengroup.org/susv3xsh/ftruncate.html>. */
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246 extern int ftruncate (int fd, off_t length);
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247 # endif
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248 #elif defined GNULIB_POSIXCHECK
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249 # undef ftruncate
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250 # define ftruncate(f,l) \
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251 (GL_LINK_WARNING ("ftruncate is unportable - " \
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252 "use gnulib module ftruncate for portability"), \
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253 ftruncate (f, l))
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254 #endif
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255
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256
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257 #if @GNULIB_GETCWD@
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258 /* Include the headers that might declare getcwd so that they will not
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259 cause confusion if included after this file. */
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260 # include <stdlib.h>
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261 # if @REPLACE_GETCWD@
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262 /* Get the name of the current working directory, and put it in SIZE bytes
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263 of BUF.
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264 Return BUF if successful, or NULL if the directory couldn't be determined
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265 or SIZE was too small.
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266 See the POSIX:2001 specification
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267 <http://www.opengroup.org/susv3xsh/getcwd.html>.
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268 Additionally, the gnulib module 'getcwd' guarantees the following GNU
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269 extension: If BUF is NULL, an array is allocated with 'malloc'; the array
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270 is SIZE bytes long, unless SIZE == 0, in which case it is as big as
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271 necessary. */
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272 # define getcwd rpl_getcwd
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273 extern char * getcwd (char *buf, size_t size);
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274 # endif
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275 #elif defined GNULIB_POSIXCHECK
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276 # undef getcwd
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277 # define getcwd(b,s) \
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278 (GL_LINK_WARNING ("getcwd is unportable - " \
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279 "use gnulib module getcwd for portability"), \
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280 getcwd (b, s))
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281 #endif
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282
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283
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284 #if @GNULIB_GETDOMAINNAME@
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285 /* Return the NIS domain name of the machine.
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286 WARNING! The NIS domain name is unrelated to the fully qualified host name
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287 of the machine. It is also unrelated to email addresses.
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288 WARNING! The NIS domain name is usually the empty string or "(none)" when
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289 not using NIS.
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290
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291 Put up to LEN bytes of the NIS domain name into NAME.
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292 Null terminate it if the name is shorter than LEN.
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293 If the NIS domain name is longer than LEN, set errno = EINVAL and return -1.
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294 Return 0 if successful, otherwise set errno and return -1. */
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295 # if !@HAVE_GETDOMAINNAME@
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296 extern int getdomainname(char *name, size_t len);
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297 # endif
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298 #elif defined GNULIB_POSIXCHECK
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299 # undef getdomainname
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300 # define getdomainname(n,l) \
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301 (GL_LINK_WARNING ("getdomainname is unportable - " \
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302 "use gnulib module getdomainname for portability"), \
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303 getdomainname (n, l))
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304 #endif
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305
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306
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307 #if @GNULIB_GETDTABLESIZE@
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308 # if !@HAVE_GETDTABLESIZE@
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309 /* Return the maximum number of file descriptors in the current process. */
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310 extern int getdtablesize (void);
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311 # endif
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312 #elif defined GNULIB_POSIXCHECK
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313 # undef getdtablesize
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314 # define getdtablesize() \
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315 (GL_LINK_WARNING ("getdtablesize is unportable - " \
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316 "use gnulib module getdtablesize for portability"), \
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317 getdtablesize ())
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318 #endif
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319
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320
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321 #if @GNULIB_GETHOSTNAME@
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322 /* Return the standard host name of the machine.
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323 WARNING! The host name may or may not be fully qualified.
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324
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325 Put up to LEN bytes of the host name into NAME.
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326 Null terminate it if the name is shorter than LEN.
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327 If the host name is longer than LEN, set errno = EINVAL and return -1.
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328 Return 0 if successful, otherwise set errno and return -1. */
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329 # if @UNISTD_H_HAVE_WINSOCK2_H@
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330 # undef gethostname
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331 # define gethostname rpl_gethostname
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332 # endif
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333 # if @UNISTD_H_HAVE_WINSOCK2_H@ || !@HAVE_GETHOSTNAME@
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334 extern int gethostname(char *name, size_t len);
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335 # endif
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336 #elif @UNISTD_H_HAVE_WINSOCK2_H@
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337 # undef gethostname
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338 # define gethostname gethostname_used_without_requesting_gnulib_module_gethostname
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339 #elif defined GNULIB_POSIXCHECK
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340 # undef gethostname
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341 # define gethostname(n,l) \
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342 (GL_LINK_WARNING ("gethostname is unportable - " \
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343 "use gnulib module gethostname for portability"), \
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344 gethostname (n, l))
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345 #endif
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346
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347
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348 #if @GNULIB_GETLOGIN_R@
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349 /* Copies the user's login name to NAME.
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350 The array pointed to by NAME has room for SIZE bytes.
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351
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352 Returns 0 if successful. Upon error, an error number is returned, or -1 in
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353 the case that the login name cannot be found but no specific error is
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354 provided (this case is hopefully rare but is left open by the POSIX spec).
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355
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356 See <http://www.opengroup.org/susv3xsh/getlogin.html>.
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357 */
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358 # if !@HAVE_DECL_GETLOGIN_R@
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359 # include <stddef.h>
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360 extern int getlogin_r (char *name, size_t size);
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361 # endif
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362 #elif defined GNULIB_POSIXCHECK
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363 # undef getlogin_r
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364 # define getlogin_r(n,s) \
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365 (GL_LINK_WARNING ("getlogin_r is unportable - " \
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366 "use gnulib module getlogin_r for portability"), \
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367 getlogin_r (n, s))
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368 #endif
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369
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370
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371 #if @GNULIB_GETPAGESIZE@
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372 # if @REPLACE_GETPAGESIZE@
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373 # define getpagesize rpl_getpagesize
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374 extern int getpagesize (void);
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375 # elif !@HAVE_GETPAGESIZE@
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376 /* This is for POSIX systems. */
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377 # if !defined getpagesize && defined _SC_PAGESIZE
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378 # if ! (defined __VMS && __VMS_VER < 70000000)
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379 # define getpagesize() sysconf (_SC_PAGESIZE)
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380 # endif
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381 # endif
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382 /* This is for older VMS. */
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383 # if !defined getpagesize && defined __VMS
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384 # ifdef __ALPHA
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385 # define getpagesize() 8192
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386 # else
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387 # define getpagesize() 512
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388 # endif
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389 # endif
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390 /* This is for BeOS. */
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391 # if !defined getpagesize && @HAVE_OS_H@
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392 # include <OS.h>
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393 # if defined B_PAGE_SIZE
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394 # define getpagesize() B_PAGE_SIZE
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395 # endif
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396 # endif
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397 /* This is for AmigaOS4.0. */
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398 # if !defined getpagesize && defined __amigaos4__
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399 # define getpagesize() 2048
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400 # endif
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401 /* This is for older Unix systems. */
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402 # if !defined getpagesize && @HAVE_SYS_PARAM_H@
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403 # include <sys/param.h>
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404 # ifdef EXEC_PAGESIZE
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405 # define getpagesize() EXEC_PAGESIZE
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406 # else
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407 # ifdef NBPG
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408 # ifndef CLSIZE
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409 # define CLSIZE 1
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410 # endif
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411 # define getpagesize() (NBPG * CLSIZE)
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412 # else
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413 # ifdef NBPC
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414 # define getpagesize() NBPC
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415 # endif
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416 # endif
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417 # endif
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418 # endif
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419 # endif
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420 #elif defined GNULIB_POSIXCHECK
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421 # undef getpagesize
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422 # define getpagesize() \
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423 (GL_LINK_WARNING ("getpagesize is unportable - " \
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424 "use gnulib module getpagesize for portability"), \
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425 getpagesize ())
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426 #endif
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427
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428
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429 #if @GNULIB_GETUSERSHELL@
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430 # if !@HAVE_GETUSERSHELL@
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431 /* Return the next valid login shell on the system, or NULL when the end of
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432 the list has been reached. */
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433 extern char *getusershell (void);
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434 /* Rewind to pointer that is advanced at each getusershell() call. */
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435 extern void setusershell (void);
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436 /* Free the pointer that is advanced at each getusershell() call and
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437 associated resources. */
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438 extern void endusershell (void);
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439 # endif
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440 #elif defined GNULIB_POSIXCHECK
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441 # undef getusershell
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442 # define getusershell() \
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443 (GL_LINK_WARNING ("getusershell is unportable - " \
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444 "use gnulib module getusershell for portability"), \
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445 getusershell ())
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446 # undef setusershell
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447 # define setusershell() \
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448 (GL_LINK_WARNING ("setusershell is unportable - " \
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449 "use gnulib module getusershell for portability"), \
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450 setusershell ())
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451 # undef endusershell
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452 # define endusershell() \
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453 (GL_LINK_WARNING ("endusershell is unportable - " \
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454 "use gnulib module getusershell for portability"), \
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455 endusershell ())
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456 #endif
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457
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458
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459 #if @GNULIB_LCHOWN@
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460 # if @REPLACE_LCHOWN@
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461 /* Change the owner of FILE to UID (if UID is not -1) and the group of FILE
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462 to GID (if GID is not -1). Do not follow symbolic links.
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463 Return 0 if successful, otherwise -1 and errno set.
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464 See the POSIX:2001 specification
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465 <http://www.opengroup.org/susv3xsh/lchown.html>. */
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|
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466 # define lchown rpl_lchown
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|
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467 extern int lchown (char const *file, uid_t owner, gid_t group);
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|
|
468 # endif
|
|
|
469 #elif defined GNULIB_POSIXCHECK
|
|
|
470 # undef lchown
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|
|
471 # define lchown(f,u,g) \
|
|
|
472 (GL_LINK_WARNING ("lchown is unportable to pre-POSIX.1-2001 " \
|
|
|
473 "systems - use gnulib module lchown for portability"), \
|
|
|
474 lchown (f, u, g))
|
|
|
475 #endif
|
|
|
476
|
|
|
477
|
|
|
478 #if @GNULIB_LSEEK@
|
|
|
479 # if @REPLACE_LSEEK@
|
|
|
480 /* Set the offset of FD relative to SEEK_SET, SEEK_CUR, or SEEK_END.
|
|
|
481 Return the new offset if successful, otherwise -1 and errno set.
|
|
|
482 See the POSIX:2001 specification
|
|
|
483 <http://www.opengroup.org/susv3xsh/lseek.html>. */
|
|
|
484 # define lseek rpl_lseek
|
|
|
485 extern off_t lseek (int fd, off_t offset, int whence);
|
|
|
486 # endif
|
|
|
487 #elif defined GNULIB_POSIXCHECK
|
|
|
488 # undef lseek
|
|
|
489 # define lseek(f,o,w) \
|
|
|
490 (GL_LINK_WARNING ("lseek does not fail with ESPIPE on pipes on some " \
|
|
|
491 "systems - use gnulib module lseek for portability"), \
|
|
|
492 lseek (f, o, w))
|
|
|
493 #endif
|
|
|
494
|
|
|
495
|
|
|
496 #if @GNULIB_READLINK@
|
|
|
497 /* Read the contents of the symbolic link FILE and place the first BUFSIZE
|
|
|
498 bytes of it into BUF. Return the number of bytes placed into BUF if
|
|
|
499 successful, otherwise -1 and errno set.
|
|
|
500 See the POSIX:2001 specification
|
|
|
501 <http://www.opengroup.org/susv3xsh/readlink.html>. */
|
|
|
502 # if !@HAVE_READLINK@
|
|
|
503 # include <stddef.h>
|
|
|
504 extern int readlink (const char *file, char *buf, size_t bufsize);
|
|
|
505 # endif
|
|
|
506 #elif defined GNULIB_POSIXCHECK
|
|
|
507 # undef readlink
|
|
|
508 # define readlink(f,b,s) \
|
|
|
509 (GL_LINK_WARNING ("readlink is unportable - " \
|
|
|
510 "use gnulib module readlink for portability"), \
|
|
|
511 readlink (f, b, s))
|
|
|
512 #endif
|
|
|
513
|
|
|
514
|
|
|
515 #if @GNULIB_SLEEP@
|
|
|
516 /* Pause the execution of the current thread for N seconds.
|
|
|
517 Returns the number of seconds left to sleep.
|
|
|
518 See the POSIX:2001 specification
|
|
|
519 <http://www.opengroup.org/susv3xsh/sleep.html>. */
|
|
|
520 # if !@HAVE_SLEEP@
|
|
|
521 extern unsigned int sleep (unsigned int n);
|
|
|
522 # endif
|
|
|
523 #elif defined GNULIB_POSIXCHECK
|
|
|
524 # undef sleep
|
|
|
525 # define sleep(n) \
|
|
|
526 (GL_LINK_WARNING ("sleep is unportable - " \
|
|
|
527 "use gnulib module sleep for portability"), \
|
|
|
528 sleep (n))
|
|
|
529 #endif
|
|
|
530
|
|
|
531
|
|
|
532 #if @GNULIB_WRITE@ && @REPLACE_WRITE@ && @GNULIB_UNISTD_H_SIGPIPE@
|
|
|
533 /* Write up to COUNT bytes starting at BUF to file descriptor FD.
|
|
|
534 See the POSIX:2001 specification
|
|
|
535 <http://www.opengroup.org/susv3xsh/write.html>. */
|
|
|
536 # undef write
|
|
|
537 # define write rpl_write
|
|
|
538 extern ssize_t write (int fd, const void *buf, size_t count);
|
|
|
539 #endif
|
|
|
540
|
|
|
541
|
|
|
542 #ifdef FCHDIR_REPLACEMENT
|
|
|
543 /* gnulib internal function. */
|
|
|
544 extern void _gl_unregister_fd (int fd);
|
|
|
545 #endif
|
|
|
546
|
|
|
547
|
|
|
548 #ifdef __cplusplus
|
|
|
549 }
|
|
|
550 #endif
|
|
|
551
|
|
|
552
|
|
|
553 #endif /* _GL_UNISTD_H */
|
|
|
554 #endif /* _GL_UNISTD_H */
|
