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annotate lib/fstatat.c @ 17464:290d581e2e24

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author Karl Berry <karl@freefriends.org>
date Sat, 10 Aug 2013 07:10:55 -0700
parents e542fd46ad6f
children
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1 /* Work around an fstatat bug on Solaris 9.
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2
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3 Copyright (C) 2006, 2009-2013 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* Written by Paul Eggert and Jim Meyering. */
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19
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20 /* If the user's config.h happens to include <sys/stat.h>, let it include only
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21 the system's <sys/stat.h> here, so that orig_fstatat doesn't recurse to
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22 rpl_fstatat. */
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23 #define __need_system_sys_stat_h
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24 #include <config.h>
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25
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26 /* Get the original definition of fstatat. It might be defined as a macro. */
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27 #include <sys/types.h>
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28 #include <sys/stat.h>
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29 #undef __need_system_sys_stat_h
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30
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31 #if HAVE_FSTATAT
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32 static int
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33 orig_fstatat (int fd, char const *filename, struct stat *buf, int flags)
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34 {
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35 return fstatat (fd, filename, buf, flags);
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36 }
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37 #endif
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38
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39 /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
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40 eliminates this include because of the preliminary #include <sys/stat.h>
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41 above. */
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42 #include "sys/stat.h"
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43
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44 #include <errno.h>
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45 #include <fcntl.h>
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46 #include <string.h>
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47
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48 #if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG
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49
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50 # ifndef LSTAT_FOLLOWS_SLASHED_SYMLINK
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51 # define LSTAT_FOLLOWS_SLASHED_SYMLINK 0
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52 # endif
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53
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54 /* fstatat should always follow symbolic links that end in /, but on
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55 Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified.
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56 Likewise, trailing slash on a non-directory should be an error.
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57 These are the same problems that lstat.c and stat.c address, so
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58 solve it in a similar way.
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59
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60 AIX 7.1 fstatat (AT_FDCWD, ..., 0) always fails, which is a bug.
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61 Work around this bug if FSTATAT_AT_FDCWD_0_BROKEN is nonzero. */
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62
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63 int
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64 rpl_fstatat (int fd, char const *file, struct stat *st, int flag)
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65 {
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66 int result = orig_fstatat (fd, file, st, flag);
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67 size_t len;
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68
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69 if (LSTAT_FOLLOWS_SLASHED_SYMLINK || result != 0)
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70 return result;
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71 len = strlen (file);
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72 if (flag & AT_SYMLINK_NOFOLLOW)
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73 {
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74 /* Fix lstat behavior. */
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75 if (file[len - 1] != '/' || S_ISDIR (st->st_mode))
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76 return 0;
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77 if (!S_ISLNK (st->st_mode))
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78 {
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79 errno = ENOTDIR;
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80 return -1;
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81 }
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82 result = orig_fstatat (fd, file, st, flag & ~AT_SYMLINK_NOFOLLOW);
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83 }
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84 /* Fix stat behavior. */
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85 if (result == 0 && !S_ISDIR (st->st_mode) && file[len - 1] == '/')
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86 {
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87 errno = ENOTDIR;
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88 return -1;
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89 }
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90 return result;
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91 }
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92
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93 #else /* ! (HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG) */
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94
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95 /* On mingw, the gnulib <sys/stat.h> defines 'stat' as a function-like
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96 macro; but using it in AT_FUNC_F2 causes compilation failure
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97 because the preprocessor sees a use of a macro that requires two
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98 arguments but is only given one. Hence, we need an inline
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99 forwarder to get past the preprocessor. */
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100 static int
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101 stat_func (char const *name, struct stat *st)
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102 {
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103 return stat (name, st);
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104 }
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105
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106 /* Likewise, if there is no native 'lstat', then the gnulib
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107 <sys/stat.h> defined it as stat, which also needs adjustment. */
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108 # if !HAVE_LSTAT
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109 # undef lstat
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110 # define lstat stat_func
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111 # endif
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112
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113 /* Replacement for Solaris' function by the same name.
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114 <http://www.google.com/search?q=fstatat+site:docs.sun.com>
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115 First, try to simulate it via l?stat ("/proc/self/fd/FD/FILE").
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116 Failing that, simulate it via save_cwd/fchdir/(stat|lstat)/restore_cwd.
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117 If either the save_cwd or the restore_cwd fails (relatively unlikely),
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118 then give a diagnostic and exit nonzero.
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119 Otherwise, this function works just like Solaris' fstatat. */
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120
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121 # define AT_FUNC_NAME fstatat
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122 # define AT_FUNC_F1 lstat
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123 # define AT_FUNC_F2 stat_func
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124 # define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW
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125 # define AT_FUNC_POST_FILE_PARAM_DECLS , struct stat *st, int flag
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126 # define AT_FUNC_POST_FILE_ARGS , st
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127 # include "at-func.c"
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128 # undef AT_FUNC_NAME
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129 # undef AT_FUNC_F1
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130 # undef AT_FUNC_F2
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131 # undef AT_FUNC_USE_F1_COND
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132 # undef AT_FUNC_POST_FILE_PARAM_DECLS
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133 # undef AT_FUNC_POST_FILE_ARGS
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134
15547
50ebbdbce688 openat: work around AIX 7.1 fstatat issue
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135 #endif /* !HAVE_FSTATAT */