1 /* Work around a bug of lstat on some systems
3 Copyright (C) 1997-1999, 2000-2006, 2008-2009 Free Software
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* written by Jim Meyering */
23 /* Get the original definition of lstat. It might be defined as a macro. */
24 #define __need_system_sys_stat_h
25 #include <sys/types.h>
27 #undef __need_system_sys_stat_h
30 orig_lstat (const char *filename, struct stat *buf)
32 return lstat (filename, buf);
41 /* lstat works differently on Linux and Solaris systems. POSIX (see
42 `pathname resolution' in the glossary) requires that programs like
43 `ls' take into consideration the fact that FILE has a trailing slash
44 when FILE is a symbolic link. On Linux and Solaris 10 systems, the
45 lstat function already has the desired semantics (in treating
46 `lstat ("symlink/", sbuf)' just like `lstat ("symlink/.", sbuf)',
47 but on Solaris 9 and earlier it does not.
49 If FILE has a trailing slash and specifies a symbolic link,
50 then use stat() to get more info on the referent of FILE.
51 If the referent is a non-directory, then set errno to ENOTDIR
52 and return -1. Otherwise, return stat's result. */
55 rpl_lstat (const char *file, struct stat *sbuf)
58 int lstat_result = orig_lstat (file, sbuf);
60 if (lstat_result != 0)
63 /* This replacement file can blindly check against '/' rather than
64 using the ISSLASH macro, because all platforms with '\\' either
65 lack symlinks (mingw) or have working lstat (cygwin) and thus do
66 not compile this file. 0 len should have already been filtered
67 out above, with a failure return of ENOENT. */
69 if (file[len - 1] != '/' || S_ISDIR (sbuf->st_mode))
72 /* At this point, a trailing slash is only permitted on
73 symlink-to-dir; but it should have found information on the
74 directory, not the symlink. Call stat() to get info about the
75 link's referent. Our replacement stat guarantees valid results,
76 even if the symlink is not pointing to a directory. */
77 if (!S_ISLNK (sbuf->st_mode))
82 return stat (file, sbuf);