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annotate lib/fchownat.c @ 17298:d536543d59a6

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statat: new module, split out from fstatat GNU Emacs needs the POSIX-specified fstatat, but not the gnulib-specified statat and lstat. Split the latter two into a new module 'statat'. * lib/openat.h: Depend on GNULIB_STATAT, not GNULIB_FSTATAT. * lib/openat.h, lib/statat.c (STATAT_INLINE): Rename from FSTATAT_INLINE. All uses changed. * modules/fstatat (Files): Remove lib/statat.c. (gl_MODULE_INDICATOR([fstatat])): Remove. (lib_SOURCES): Remove. (Maintainer): Add self. * modules/statat, modules/statat-tests, tests/test-statat.c: New files. * tests/test-fstatat.c (BASE): Don't define if already defined. (do_stat, do_lstat) [!TEST_STATAT]: Test fstatat instead.
author Paul Eggert <eggert@cs.ucla.edu>
date Wed, 23 Jan 2013 18:20:09 -0800
parents e542fd46ad6f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* This function serves as replacement for a missing fchownat function,
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2 as well as a work around for the fchownat bug in glibc-2.4:
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3 <http://lists.ubuntu.com/archives/ubuntu-users/2006-September/093218.html>
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4 when the buggy fchownat-with-AT_SYMLINK_NOFOLLOW operates on a symlink, it
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5 mistakenly affects the symlink referent, rather than the symlink itself.
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6
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7 Copyright (C) 2006-2007, 2009-2013 Free Software Foundation, Inc.
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8
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9 This program is free software: you can redistribute it and/or modify
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10 it under the terms of the GNU General Public License as published by
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11 the Free Software Foundation; either version 3 of the License, or
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12 (at your option) any later version.
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13
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14 This program is distributed in the hope that it will be useful,
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15 but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 GNU General Public License for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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21
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22 /* written by Jim Meyering */
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23
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24 #include <config.h>
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25
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26 #include <unistd.h>
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27
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28 #include <errno.h>
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29 #include <string.h>
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30
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31 #include "openat.h"
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32
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33 #if !HAVE_FCHOWNAT
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34
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35 /* Replacement for Solaris' function by the same name.
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36 Invoke chown or lchown on file, FILE, using OWNER and GROUP, in the
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37 directory open on descriptor FD. If FLAG is AT_SYMLINK_NOFOLLOW, then
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38 use lchown, otherwise, use chown. If possible, do it without changing
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39 the working directory. Otherwise, resort to using save_cwd/fchdir,
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40 then (chown|lchown)/restore_cwd. If either the save_cwd or the
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41 restore_cwd fails, then give a diagnostic and exit nonzero. */
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42
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43 # define AT_FUNC_NAME fchownat
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44 # define AT_FUNC_F1 lchown
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45 # define AT_FUNC_F2 chown
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46 # define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW
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47 # define AT_FUNC_POST_FILE_PARAM_DECLS , uid_t owner, gid_t group, int flag
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48 # define AT_FUNC_POST_FILE_ARGS , owner, group
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49 # include "at-func.c"
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50 # undef AT_FUNC_NAME
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51 # undef AT_FUNC_F1
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52 # undef AT_FUNC_F2
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53 # undef AT_FUNC_USE_F1_COND
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54 # undef AT_FUNC_POST_FILE_PARAM_DECLS
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55 # undef AT_FUNC_POST_FILE_ARGS
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56
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57 #else /* HAVE_FCHOWNAT */
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58
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59 # undef fchownat
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60
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61 # if FCHOWNAT_NOFOLLOW_BUG
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62
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63 /* Failure to handle AT_SYMLINK_NOFOLLOW requires the /proc/self/fd or
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64 fchdir workaround to call lchown for lchownat, but there is no need
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65 to penalize chownat. */
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66 static int
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67 local_lchownat (int fd, char const *file, uid_t owner, gid_t group);
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68
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69 # define AT_FUNC_NAME local_lchownat
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70 # define AT_FUNC_F1 lchown
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71 # define AT_FUNC_POST_FILE_PARAM_DECLS , uid_t owner, gid_t group
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72 # define AT_FUNC_POST_FILE_ARGS , owner, group
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73 # include "at-func.c"
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74 # undef AT_FUNC_NAME
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75 # undef AT_FUNC_F1
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76 # undef AT_FUNC_POST_FILE_PARAM_DECLS
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77 # undef AT_FUNC_POST_FILE_ARGS
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78
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79 # endif
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80
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81 /* Work around bugs with trailing slash, using the same workarounds as
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82 chown and lchown. */
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83
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84 int
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85 rpl_fchownat (int fd, char const *file, uid_t owner, gid_t group, int flag)
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86 {
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87 # if FCHOWNAT_NOFOLLOW_BUG
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88 if (flag == AT_SYMLINK_NOFOLLOW)
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89 return local_lchownat (fd, file, owner, group);
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90 # endif
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91 # if FCHOWNAT_EMPTY_FILENAME_BUG
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92 if (file[0] == '\0')
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93 {
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94 errno = ENOENT;
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95 return -1;
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96 }
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97 # endif
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98 # if CHOWN_TRAILING_SLASH_BUG
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99 {
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100 size_t len = strlen (file);
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101 struct stat st;
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102 if (len && file[len - 1] == '/')
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103 {
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104 if (statat (fd, file, &st))
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105 return -1;
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106 if (flag == AT_SYMLINK_NOFOLLOW)
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107 return fchownat (fd, file, owner, group, 0);
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108 }
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109 }
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110 # endif
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111 return fchownat (fd, file, owner, group, flag);
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112 }
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113
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114 #endif /* HAVE_FCHOWNAT */