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annotate lib/lstat.c @ 17188:d7a44f0f7a15

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ftruncate, fts, lstat, openat, raise: no 'static inline' * lib/ftruncate.c (chsize_nothrow): * lib/fts.c (opendirat, diropen): * lib/lstat.c (orig_lstat): * lib/openat.c (orig_openat): * lib/raise.c (raise_nothrow): Now static, not static inline. * m4/ftruncate.m4 (gl_PREREQ_FTRUNCATE): * m4/fts.m4 (gl_FUNC_FTS_CORE): * m4/lstat.m4 (gl_PREREQ_LSTAT): * m4/openat.m4 (gl_PREREQ_OPENAT): * m4/raise.m4 (gl_PREREQ_RAISE): Do not require AC_C_INLINE.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 20 Nov 2012 22:25:09 -0800 (2012-11-21)
parents 18a38c9615f0
children e542fd46ad6f
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1 /* Work around a bug of lstat on some systems
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2
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3 Copyright (C) 1997-2006, 2008-2012 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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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 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_lstat doesn't recurse to
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22 rpl_lstat. */
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23 #define __need_system_sys_stat_h
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24 #include <config.h>
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26 #if !HAVE_LSTAT
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27 /* On systems that lack symlinks, our replacement <sys/stat.h> already
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28 defined lstat as stat, so there is nothing further to do other than
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29 avoid an empty file. */
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30 typedef int dummy;
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31 #else /* HAVE_LSTAT */
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32
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33 /* Get the original definition of lstat. It might be defined as a macro. */
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34 # include <sys/types.h>
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35 # include <sys/stat.h>
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36 # undef __need_system_sys_stat_h
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38 static int
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39 orig_lstat (const char *filename, struct stat *buf)
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40 {
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41 return lstat (filename, buf);
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42 }
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43
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44 /* Specification. */
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45 /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
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46 eliminates this include because of the preliminary #include <sys/stat.h>
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47 above. */
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48 # include "sys/stat.h"
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49
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50 # include <string.h>
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51 # include <errno.h>
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52
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53 /* lstat works differently on Linux and Solaris systems. POSIX (see
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54 "pathname resolution" in the glossary) requires that programs like
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55 'ls' take into consideration the fact that FILE has a trailing slash
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56 when FILE is a symbolic link. On Linux and Solaris 10 systems, the
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57 lstat function already has the desired semantics (in treating
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58 'lstat ("symlink/", sbuf)' just like 'lstat ("symlink/.", sbuf)',
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59 but on Solaris 9 and earlier it does not.
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60
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61 If FILE has a trailing slash and specifies a symbolic link,
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62 then use stat() to get more info on the referent of FILE.
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63 If the referent is a non-directory, then set errno to ENOTDIR
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64 and return -1. Otherwise, return stat's result. */
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65
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66 int
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67 rpl_lstat (const char *file, struct stat *sbuf)
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68 {
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69 size_t len;
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70 int lstat_result = orig_lstat (file, sbuf);
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71
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72 if (lstat_result != 0)
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73 return lstat_result;
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74
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75 /* This replacement file can blindly check against '/' rather than
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76 using the ISSLASH macro, because all platforms with '\\' either
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77 lack symlinks (mingw) or have working lstat (cygwin) and thus do
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78 not compile this file. 0 len should have already been filtered
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79 out above, with a failure return of ENOENT. */
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80 len = strlen (file);
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81 if (file[len - 1] != '/' || S_ISDIR (sbuf->st_mode))
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82 return 0;
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83
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84 /* At this point, a trailing slash is only permitted on
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85 symlink-to-dir; but it should have found information on the
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86 directory, not the symlink. Call stat() to get info about the
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87 link's referent. Our replacement stat guarantees valid results,
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88 even if the symlink is not pointing to a directory. */
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89 if (!S_ISLNK (sbuf->st_mode))
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90 {
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91 errno = ENOTDIR;
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92 return -1;
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93 }
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94 return stat (file, sbuf);
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95 }
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96
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97 #endif /* HAVE_LSTAT */