Mercurial > hg > octave-kai > gnulib-hg
annotate lib/chdir-safer.c @ 17160:72f4bab621be
fts: introduce FTS_VERBATIM
This gives clients the option to disable stripping of trailing slashes
from input path names during fts_open initialization.
The recent change v0.0-7611-g3a9002d that made fts_open strip trailing
slashes from input path names had a negative impact on findutils that
relies on the old fts_open behavior to implement POSIX requirement that
each path operand of the find utility shall be evaluated unaltered as it
was provided, including all trailing slash characters.
* lib/fts_.h (FTS_VERBATIM): New bit flag.
(FTS_OPTIONMASK, FTS_NAMEONLY, FTS_STOP): Adjust.
* lib/fts.c (fts_open): Honor it.
| author | Dmitry V. Levin <ldv@altlinux.org> |
|---|---|
| date | Sun, 18 Nov 2012 04:40:18 +0400 |
| parents | 8250f2777afc |
| children | e542fd46ad6f |
| rev | line source |
|---|---|
| 6527 | 1 /* much like chdir(2), but safer |
| 2 | |
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maint: update all copyright year number ranges
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3 Copyright (C) 2005-2006, 2008-2012 Free Software Foundation, Inc. |
| 6527 | 4 |
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Change copyright notice from GPLv2+ to GPLv3+.
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5 This program is free software: you can redistribute it and/or modify |
| 6527 | 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. |
| 6527 | 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/>. */ |
| 6527 | 17 |
| 18 /* written by Jim Meyering */ | |
| 19 | |
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* _fpending.c: Include <config.h> unconditionally, since we no
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20 #include <config.h> |
| 6527 | 21 |
| 22 #include "chdir-safer.h" | |
| 23 | |
| 24 #include <stdbool.h> | |
| 25 #include <fcntl.h> | |
| 26 #include <errno.h> | |
| 27 #include <unistd.h> | |
| 28 #include <sys/types.h> | |
| 29 #include <sys/stat.h> | |
| 6912 | 30 #include "same-inode.h" |
| 6527 | 31 |
| 11941 | 32 #ifndef HAVE_READLINK |
| 33 # define HAVE_READLINK 0 | |
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Avoid compile failure on systems without ELOOP (like mingw).
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34 #endif |
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35 |
| 6527 | 36 /* Like chdir, but fail if DIR is a symbolic link to a directory (or |
|
13616
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fcntl-h, etc.: prefer O_SEARCH to O_RDONLY when applicable
Paul Eggert <eggert@cs.ucla.edu>
parents:
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37 similar funny business). This avoids a minor race condition |
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38 between when a directory is created or statted and when the process |
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39 chdirs into it. |
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40 |
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41 On older systems lacking full support for O_SEARCH, this function |
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42 can also fail if DIR is not readable. */ |
| 6527 | 43 int |
| 44 chdir_no_follow (char const *dir) | |
| 45 { | |
| 46 int result = 0; | |
| 47 int saved_errno; | |
| 48 int fd = open (dir, | |
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49 O_SEARCH | O_DIRECTORY | O_NOCTTY | O_NOFOLLOW | O_NONBLOCK); |
| 6527 | 50 if (fd < 0) |
| 51 return -1; | |
| 52 | |
| 53 /* If open follows symlinks, lstat DIR and fstat FD to ensure that | |
| 54 they are the same file; if they are different files, set errno to | |
| 55 ELOOP (the same value that open uses for symlinks with | |
|
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Make chdir-safer.c more efficient on a system with no symlinks.
Jim Meyering <meyering@redhat.com>
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56 O_NOFOLLOW) so the caller can report a failure. |
| 11941 | 57 Skip this check if HAVE_READLINK == 0, which should be the case |
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58 on any system that lacks symlink support. */ |
| 11941 | 59 if (HAVE_READLINK && ! HAVE_WORKING_O_NOFOLLOW) |
| 6527 | 60 { |
| 61 struct stat sb1; | |
| 62 result = lstat (dir, &sb1); | |
| 63 if (result == 0) | |
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64 { |
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65 struct stat sb2; |
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66 result = fstat (fd, &sb2); |
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67 if (result == 0 && ! SAME_INODE (sb1, sb2)) |
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68 { |
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69 errno = ELOOP; |
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70 result = -1; |
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71 } |
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72 } |
| 6527 | 73 } |
| 74 | |
| 75 if (result == 0) | |
| 76 result = fchdir (fd); | |
| 77 | |
| 78 saved_errno = errno; | |
| 79 close (fd); | |
| 80 errno = saved_errno; | |
| 81 return result; | |
| 82 } |