Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/dirchownmod.c @ 17907:0a1c2535cad9
euidaccess: Fix Android build
* modules/euidaccess (Depends-on): Add fcntl-h to ensure that
AT_EACCESS gets declared.
| author | Kevin Cernekee <cernekee@google.com> |
|---|---|
| date | Wed, 11 Feb 2015 15:22:54 -0800 |
| parents | ab58d4870664 |
| children |
| rev | line source |
|---|---|
| 6969 | 1 /* Change the ownership and mode bits of a directory. |
| 2 | |
| 17848 | 3 Copyright (C) 2006-2015 Free Software Foundation, Inc. |
| 6969 | 4 |
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5 This program is free software: you can redistribute it and/or modify |
| 6969 | 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. |
| 6969 | 9 |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 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/>. */ |
| 6969 | 17 |
| 18 /* Written by Paul Eggert. */ | |
| 19 | |
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20 #include <config.h> |
| 6969 | 21 |
| 22 #include "dirchownmod.h" | |
| 23 | |
| 24 #include <errno.h> | |
| 25 #include <sys/types.h> | |
| 26 #include <sys/stat.h> | |
| 27 #include <unistd.h> | |
| 28 | |
| 29 #include "stat-macros.h" | |
| 30 | |
| 7173 | 31 #ifndef HAVE_FCHMOD |
| 32 # define HAVE_FCHMOD 0 | |
| 33 # undef fchmod | |
| 34 # define fchmod(fd, mode) (-1) | |
| 35 #endif | |
| 36 | |
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37 /* Change the ownership and mode bits of a directory. If FD is |
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38 nonnegative, it should be a file descriptor associated with the |
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39 directory; close it before returning. DIR is the name of the |
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40 directory. |
| 6969 | 41 |
| 42 If MKDIR_MODE is not (mode_t) -1, mkdir (DIR, MKDIR_MODE) has just | |
| 43 been executed successfully with umask zero, so DIR should be a | |
| 44 directory (not a symbolic link). | |
| 45 | |
| 46 First, set the file's owner to OWNER and group to GROUP, but leave | |
| 47 the owner alone if OWNER is (uid_t) -1, and similarly for GROUP. | |
| 48 | |
| 49 Then, set the file's mode bits to MODE, except preserve any of the | |
| 50 bits that correspond to zero bits in MODE_BITS. In other words, | |
| 51 MODE_BITS is a mask that specifies which of the file's mode bits | |
| 52 should be set or cleared. MODE should be a subset of MODE_BITS, | |
| 53 which in turn should be a subset of CHMOD_MODE_BITS. | |
| 54 | |
| 55 This implementation assumes the current umask is zero. | |
| 56 | |
| 57 Return 0 if successful, -1 (setting errno) otherwise. Unsuccessful | |
| 58 calls may do the chown but not the chmod. */ | |
| 59 | |
| 60 int | |
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61 dirchownmod (int fd, char const *dir, mode_t mkdir_mode, |
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62 uid_t owner, gid_t group, |
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63 mode_t mode, mode_t mode_bits) |
| 6969 | 64 { |
| 65 struct stat st; | |
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66 int result = (fd < 0 ? stat (dir, &st) : fstat (fd, &st)); |
| 6969 | 67 |
| 68 if (result == 0) | |
| 69 { | |
| 70 mode_t dir_mode = st.st_mode; | |
| 71 | |
| 72 /* Check whether DIR is a directory. If FD is nonnegative, this | |
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73 check avoids changing the ownership and mode bits of the |
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74 wrong file in many cases. This doesn't fix all the race |
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75 conditions, but it is better than nothing. */ |
| 6969 | 76 if (! S_ISDIR (dir_mode)) |
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77 { |
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78 errno = ENOTDIR; |
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79 result = -1; |
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80 } |
| 6969 | 81 else |
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82 { |
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83 /* If at least one of the S_IXUGO bits are set, chown might |
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84 clear the S_ISUID and S_SGID bits. Keep track of any |
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85 file mode bits whose values are indeterminate due to this |
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86 issue. */ |
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87 mode_t indeterminate = 0; |
| 6969 | 88 |
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89 /* On some systems, chown clears S_ISUID and S_ISGID, so do |
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90 chown before chmod. On older System V hosts, ordinary |
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91 users can give their files away via chown; don't worry |
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92 about that here, since users shouldn't do that. */ |
| 6969 | 93 |
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94 if ((owner != (uid_t) -1 && owner != st.st_uid) |
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95 || (group != (gid_t) -1 && group != st.st_gid)) |
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96 { |
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97 result = (0 <= fd |
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98 ? fchown (fd, owner, group) |
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99 : mkdir_mode != (mode_t) -1 |
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100 ? lchown (dir, owner, group) |
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101 : chown (dir, owner, group)); |
| 6969 | 102 |
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103 /* Either the user cares about an indeterminate bit and |
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104 it'll be set properly by chmod below, or the user |
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105 doesn't care and it's OK to use the bit's pre-chown |
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106 value. So there's no need to re-stat DIR here. */ |
| 6969 | 107 |
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108 if (result == 0 && (dir_mode & S_IXUGO)) |
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109 indeterminate = dir_mode & (S_ISUID | S_ISGID); |
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110 } |
| 6969 | 111 |
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112 /* If the file mode bits might not be right, use chmod to |
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113 change them. Don't change bits the user doesn't care |
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114 about. */ |
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115 if (result == 0 && (((dir_mode ^ mode) | indeterminate) & mode_bits)) |
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116 { |
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117 mode_t chmod_mode = |
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118 mode | (dir_mode & CHMOD_MODE_BITS & ~mode_bits); |
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119 result = (HAVE_FCHMOD && 0 <= fd |
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120 ? fchmod (fd, chmod_mode) |
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121 : mkdir_mode != (mode_t) -1 |
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122 ? lchmod (dir, chmod_mode) |
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123 : chmod (dir, chmod_mode)); |
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124 } |
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125 } |
| 6969 | 126 } |
| 127 | |
| 128 if (0 <= fd) | |
| 129 { | |
| 130 if (result == 0) | |
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131 result = close (fd); |
| 6969 | 132 else |
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133 { |
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134 int e = errno; |
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135 close (fd); |
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136 errno = e; |
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137 } |
| 6969 | 138 } |
| 139 | |
| 140 return result; | |
| 141 } |