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annotate lib/openat.c @ 7017:005fe24b840a

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Update javaexec module from GNU gettext 0.15.
author Bruno Haible <bruno@clisp.org>
date Sat, 22 Jul 2006 15:17:55 +0000
parents d65bd1fc3298
children 43e3888c56c4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* provide a replacement openat function
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2 Copyright (C) 2004, 2005, 2006 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 2, 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 /* written by Jim Meyering */
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19
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20 #ifdef HAVE_CONFIG_H
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21 # include <config.h>
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22 #endif
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23
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24 #include "openat.h"
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25
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26 #include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
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27 #include "fcntl--.h"
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28 #include "openat-priv.h"
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29 #include "save-cwd.h"
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30 #include "unistd--.h"
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31
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32 #include <stdarg.h>
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33 #include <stddef.h>
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34 #include <errno.h>
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35
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36 /* Replacement for Solaris' openat function.
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37 <http://www.google.com/search?q=openat+site:docs.sun.com>
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38 Simulate it by doing save_cwd/fchdir/open/restore_cwd.
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39 If either the save_cwd or the restore_cwd fails (relatively unlikely,
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40 and usually indicative of a problem that deserves close attention),
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41 then give a diagnostic and exit nonzero.
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42 Otherwise, upon failure, set errno and return -1, as openat does.
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43 Upon successful completion, return a file descriptor. */
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44 int
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45 openat (int fd, char const *file, int flags, ...)
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46 {
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47 mode_t mode = 0;
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48
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49 if (flags & O_CREAT)
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50 {
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51 va_list arg;
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52 va_start (arg, flags);
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53
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54 /* If mode_t is narrower than int, use the promoted type (int),
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55 not mode_t. Use sizeof to guess whether mode_t is narrower;
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56 we don't know of any practical counterexamples. */
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57 mode = (sizeof (mode_t) < sizeof (int)
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58 ? va_arg (arg, int)
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59 : va_arg (arg, mode_t));
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60
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61 va_end (arg);
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62 }
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63
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64 return openat_permissive (fd, file, flags, mode, NULL);
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65 }
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66
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67 /* Like openat (FD, FILE, FLAGS, MODE), but if CWD_ERRNO is
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68 nonnull, set *CWD_ERRNO to an errno value if unable to save
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69 or restore the initial working directory. This is needed only
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70 the first time remove.c's remove_dir opens a command-line
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71 directory argument.
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72
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73 If a previous attempt to restore the current working directory
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74 failed, then we must not even try to access a `.'-relative name.
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75 It is the caller's responsibility not to call this function
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76 in that case. */
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77
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78 int
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79 openat_permissive (int fd, char const *file, int flags, mode_t mode,
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80 int *cwd_errno)
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81 {
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82 struct saved_cwd saved_cwd;
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83 int saved_errno;
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84 int err;
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85 bool save_ok;
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86
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87 if (fd == AT_FDCWD || IS_ABSOLUTE_FILE_NAME (file))
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88 return open (file, flags, mode);
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89
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90 {
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91 char *proc_file;
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92 BUILD_PROC_NAME (proc_file, fd, file);
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93 err = open (proc_file, flags, mode);
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94 /* If the syscall succeeds, or if it fails with an unexpected
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95 errno value, then return right away. Otherwise, fall through
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96 and resort to using save_cwd/restore_cwd. */
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97 if (0 <= err || ! EXPECTED_ERRNO (errno))
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98 return err;
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99 }
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100
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101 save_ok = (save_cwd (&saved_cwd) == 0);
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102 if (! save_ok)
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103 {
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104 if (! cwd_errno)
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105 openat_save_fail (errno);
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106 *cwd_errno = errno;
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107 }
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108
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109 err = fchdir (fd);
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110 saved_errno = errno;
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111
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112 if (! err)
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113 {
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114 err = open (file, flags, mode);
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115 saved_errno = errno;
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116 if (save_ok && restore_cwd (&saved_cwd) != 0)
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117 {
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118 if (! cwd_errno)
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119 openat_restore_fail (errno);
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120 *cwd_errno = errno;
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121 }
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122 }
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123
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124 free_cwd (&saved_cwd);
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125 errno = saved_errno;
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126 return err;
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127 }
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128
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129 #if !HAVE_FDOPENDIR
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130
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131 /* Replacement for Solaris' function by the same name.
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132 <http://www.google.com/search?q=fdopendir+site:docs.sun.com>
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133 Simulate it by doing save_cwd/fchdir/opendir(".")/restore_cwd.
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134 If either the save_cwd or the restore_cwd fails (relatively unlikely,
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135 and usually indicative of a problem that deserves close attention),
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136 then give a diagnostic and exit nonzero.
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137 Otherwise, this function works just like Solaris' fdopendir.
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138
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139 W A R N I N G:
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140 Unlike the other fd-related functions here, this one
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141 effectively consumes its FD parameter. The caller should not
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142 close or otherwise manipulate FD if this function returns successfully. */
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143 DIR *
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144 fdopendir (int fd)
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145 {
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146 struct saved_cwd saved_cwd;
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147 int saved_errno;
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148 DIR *dir;
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149
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150 char *proc_file;
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151 BUILD_PROC_NAME (proc_file, fd, ".");
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152 dir = opendir (proc_file);
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153 saved_errno = errno;
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154
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155 /* If the syscall fails with an expected errno value, resort to
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156 save_cwd/restore_cwd. */
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157 if (! dir && EXPECTED_ERRNO (saved_errno))
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158 {
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159 if (save_cwd (&saved_cwd) != 0)
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160 openat_save_fail (errno);
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161
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162 if (fchdir (fd) != 0)
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163 {
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164 dir = NULL;
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165 saved_errno = errno;
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166 }
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167 else
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168 {
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169 dir = opendir (".");
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170 saved_errno = errno;
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171
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172 if (restore_cwd (&saved_cwd) != 0)
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173 openat_restore_fail (errno);
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174 }
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175
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176 free_cwd (&saved_cwd);
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177 }
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178
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179 if (dir)
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180 close (fd);
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181 errno = saved_errno;
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182 return dir;
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183 }
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184
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185 #endif
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186
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187 /* Replacement for Solaris' function by the same name.
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188 <http://www.google.com/search?q=fstatat+site:docs.sun.com>
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189 Simulate it by doing save_cwd/fchdir/(stat|lstat)/restore_cwd.
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190 If either the save_cwd or the restore_cwd fails (relatively unlikely,
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191 and usually indicative of a problem that deserves close attention),
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192 then give a diagnostic and exit nonzero.
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193 Otherwise, this function works just like Solaris' fstatat. */
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194 int
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195 fstatat (int fd, char const *file, struct stat *st, int flag)
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196 {
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197 struct saved_cwd saved_cwd;
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198 int saved_errno;
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199 int err;
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200
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201 if (fd == AT_FDCWD || IS_ABSOLUTE_FILE_NAME (file))
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202 return (flag == AT_SYMLINK_NOFOLLOW
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203 ? lstat (file, st)
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204 : stat (file, st));
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205
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206 {
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207 char *proc_file;
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208 BUILD_PROC_NAME (proc_file, fd, file);
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209 err = (flag == AT_SYMLINK_NOFOLLOW
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210 ? lstat (proc_file, st)
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211 : stat (proc_file, st));
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212 /* If the syscall succeeds, or if it fails with an unexpected
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213 errno value, then return right away. Otherwise, fall through
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214 and resort to using save_cwd/restore_cwd. */
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diff changeset
215 if (0 <= err || ! EXPECTED_ERRNO (errno))
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216 return err;
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217 }
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218
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219 if (save_cwd (&saved_cwd) != 0)
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220 openat_save_fail (errno);
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221
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222 err = fchdir (fd);
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223 saved_errno = errno;
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diff changeset
224
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225 if (! err)
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diff changeset
226 {
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227 err = (flag == AT_SYMLINK_NOFOLLOW
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diff changeset
228 ? lstat (file, st)
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229 : stat (file, st));
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diff changeset
230 saved_errno = errno;
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231
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232 if (restore_cwd (&saved_cwd) != 0)
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233 openat_restore_fail (errno);
5609
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234 }
84f75cbb306a * modules/chdir-long (Depends-on): Remove mempcpy.
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diff changeset
235
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diff changeset
236 free_cwd (&saved_cwd);
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diff changeset
237 errno = saved_errno;
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diff changeset
238 return err;
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diff changeset
239 }
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240
3baa574549ae * modules/openat (Files): Add lib/openat-die.c.
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diff changeset
241 /* Replacement for Solaris' function by the same name.
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diff changeset
242 <http://www.google.com/search?q=unlinkat+site:docs.sun.com>
3baa574549ae * modules/openat (Files): Add lib/openat-die.c.
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diff changeset
243 Simulate it by doing save_cwd/fchdir/(unlink|rmdir)/restore_cwd.
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diff changeset
244 If either the save_cwd or the restore_cwd fails (relatively unlikely,
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diff changeset
245 and usually indicative of a problem that deserves close attention),
3baa574549ae * modules/openat (Files): Add lib/openat-die.c.
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diff changeset
246 then give a diagnostic and exit nonzero.
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diff changeset
247 Otherwise, this function works just like Solaris' unlinkat. */
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diff changeset
248 int
3baa574549ae * modules/openat (Files): Add lib/openat-die.c.
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diff changeset
249 unlinkat (int fd, char const *file, int flag)
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diff changeset
250 {
3baa574549ae * modules/openat (Files): Add lib/openat-die.c.
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diff changeset
251 struct saved_cwd saved_cwd;
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diff changeset
252 int saved_errno;
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Paul Eggert <eggert@cs.ucla.edu>
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diff changeset
253 int err;
3baa574549ae * modules/openat (Files): Add lib/openat-die.c.
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diff changeset
254
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255 if (fd == AT_FDCWD || IS_ABSOLUTE_FILE_NAME (file))
6272
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diff changeset
256 return (flag == AT_REMOVEDIR ? rmdir (file) : unlink (file));
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diff changeset
257
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258 {
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diff changeset
259 char *proc_file;
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diff changeset
260 BUILD_PROC_NAME (proc_file, fd, file);
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diff changeset
261 err = (flag == AT_REMOVEDIR ? rmdir (proc_file) : unlink (proc_file));
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diff changeset
262 /* If the syscall succeeds, or if it fails with an unexpected
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diff changeset
263 errno value, then return right away. Otherwise, fall through
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diff changeset
264 and resort to using save_cwd/restore_cwd. */
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diff changeset
265 if (0 <= err || ! EXPECTED_ERRNO (errno))
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diff changeset
266 return err;
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diff changeset
267 }
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268
6272
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diff changeset
269 if (save_cwd (&saved_cwd) != 0)
3baa574549ae * modules/openat (Files): Add lib/openat-die.c.
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diff changeset
270 openat_save_fail (errno);
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diff changeset
271
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272 err = fchdir (fd);
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273 saved_errno = errno;
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274
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275 if (! err)
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3baa574549ae * modules/openat (Files): Add lib/openat-die.c.
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276 {
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277 err = (flag == AT_REMOVEDIR ? rmdir (file) : unlink (file));
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3baa574549ae * modules/openat (Files): Add lib/openat-die.c.
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278 saved_errno = errno;
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279
6b31c8787689 Sync from coreutils.
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parents: 6322
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280 if (restore_cwd (&saved_cwd) != 0)
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281 openat_restore_fail (errno);
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282 }
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parents: 6259
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283
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284 free_cwd (&saved_cwd);
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285 errno = saved_errno;
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286 return err;
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287 }