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6ec2e0f5 SDJ |
1 | /* Work around an fstatat bug on Solaris 9. |
2 | ||
5df4cba6 | 3 | Copyright (C) 2006, 2009-2020 Free Software Foundation, Inc. |
6ec2e0f5 SDJ |
4 | |
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
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 | |
c0c3707f | 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
6ec2e0f5 SDJ |
17 | |
18 | /* Written by Paul Eggert and Jim Meyering. */ | |
19 | ||
20 | /* If the user's config.h happens to include <sys/stat.h>, let it include only | |
21 | the system's <sys/stat.h> here, so that orig_fstatat doesn't recurse to | |
22 | rpl_fstatat. */ | |
23 | #define __need_system_sys_stat_h | |
24 | #include <config.h> | |
25 | ||
26 | /* Get the original definition of fstatat. It might be defined as a macro. */ | |
27 | #include <sys/types.h> | |
28 | #include <sys/stat.h> | |
29 | #undef __need_system_sys_stat_h | |
30 | ||
c0c3707f | 31 | #if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG |
6ec2e0f5 SDJ |
32 | static int |
33 | orig_fstatat (int fd, char const *filename, struct stat *buf, int flags) | |
34 | { | |
35 | return fstatat (fd, filename, buf, flags); | |
36 | } | |
37 | #endif | |
38 | ||
c0c3707f | 39 | #ifdef __osf__ |
6ec2e0f5 SDJ |
40 | /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc |
41 | eliminates this include because of the preliminary #include <sys/stat.h> | |
42 | above. */ | |
c0c3707f CB |
43 | # include "sys/stat.h" |
44 | #else | |
45 | # include <sys/stat.h> | |
46 | #endif | |
47 | ||
48 | #include "stat-time.h" | |
6ec2e0f5 SDJ |
49 | |
50 | #include <errno.h> | |
51 | #include <fcntl.h> | |
c0c3707f | 52 | #include <stdlib.h> |
6ec2e0f5 SDJ |
53 | #include <string.h> |
54 | ||
55 | #if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG | |
56 | ||
57 | # ifndef LSTAT_FOLLOWS_SLASHED_SYMLINK | |
58 | # define LSTAT_FOLLOWS_SLASHED_SYMLINK 0 | |
59 | # endif | |
60 | ||
c0c3707f CB |
61 | static int |
62 | normal_fstatat (int fd, char const *file, struct stat *st, int flag) | |
63 | { | |
64 | return stat_time_normalize (orig_fstatat (fd, file, st, flag), st); | |
65 | } | |
66 | ||
6ec2e0f5 SDJ |
67 | /* fstatat should always follow symbolic links that end in /, but on |
68 | Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified. | |
69 | Likewise, trailing slash on a non-directory should be an error. | |
70 | These are the same problems that lstat.c and stat.c address, so | |
71 | solve it in a similar way. | |
72 | ||
73 | AIX 7.1 fstatat (AT_FDCWD, ..., 0) always fails, which is a bug. | |
74 | Work around this bug if FSTATAT_AT_FDCWD_0_BROKEN is nonzero. */ | |
75 | ||
76 | int | |
77 | rpl_fstatat (int fd, char const *file, struct stat *st, int flag) | |
78 | { | |
c0c3707f | 79 | int result = normal_fstatat (fd, file, st, flag); |
6ec2e0f5 SDJ |
80 | size_t len; |
81 | ||
82 | if (LSTAT_FOLLOWS_SLASHED_SYMLINK || result != 0) | |
83 | return result; | |
84 | len = strlen (file); | |
85 | if (flag & AT_SYMLINK_NOFOLLOW) | |
86 | { | |
87 | /* Fix lstat behavior. */ | |
88 | if (file[len - 1] != '/' || S_ISDIR (st->st_mode)) | |
89 | return 0; | |
90 | if (!S_ISLNK (st->st_mode)) | |
91 | { | |
92 | errno = ENOTDIR; | |
93 | return -1; | |
94 | } | |
c0c3707f | 95 | result = normal_fstatat (fd, file, st, flag & ~AT_SYMLINK_NOFOLLOW); |
6ec2e0f5 SDJ |
96 | } |
97 | /* Fix stat behavior. */ | |
98 | if (result == 0 && !S_ISDIR (st->st_mode) && file[len - 1] == '/') | |
99 | { | |
100 | errno = ENOTDIR; | |
101 | return -1; | |
102 | } | |
103 | return result; | |
104 | } | |
105 | ||
106 | #else /* ! (HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG) */ | |
107 | ||
108 | /* On mingw, the gnulib <sys/stat.h> defines 'stat' as a function-like | |
109 | macro; but using it in AT_FUNC_F2 causes compilation failure | |
110 | because the preprocessor sees a use of a macro that requires two | |
111 | arguments but is only given one. Hence, we need an inline | |
112 | forwarder to get past the preprocessor. */ | |
113 | static int | |
114 | stat_func (char const *name, struct stat *st) | |
115 | { | |
116 | return stat (name, st); | |
117 | } | |
118 | ||
119 | /* Likewise, if there is no native 'lstat', then the gnulib | |
120 | <sys/stat.h> defined it as stat, which also needs adjustment. */ | |
121 | # if !HAVE_LSTAT | |
122 | # undef lstat | |
123 | # define lstat stat_func | |
124 | # endif | |
125 | ||
126 | /* Replacement for Solaris' function by the same name. | |
c0c3707f | 127 | <https://www.google.com/search?q=fstatat+site:docs.oracle.com> |
6ec2e0f5 SDJ |
128 | First, try to simulate it via l?stat ("/proc/self/fd/FD/FILE"). |
129 | Failing that, simulate it via save_cwd/fchdir/(stat|lstat)/restore_cwd. | |
130 | If either the save_cwd or the restore_cwd fails (relatively unlikely), | |
131 | then give a diagnostic and exit nonzero. | |
132 | Otherwise, this function works just like Solaris' fstatat. */ | |
133 | ||
134 | # define AT_FUNC_NAME fstatat | |
135 | # define AT_FUNC_F1 lstat | |
136 | # define AT_FUNC_F2 stat_func | |
137 | # define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW | |
138 | # define AT_FUNC_POST_FILE_PARAM_DECLS , struct stat *st, int flag | |
139 | # define AT_FUNC_POST_FILE_ARGS , st | |
140 | # include "at-func.c" | |
141 | # undef AT_FUNC_NAME | |
142 | # undef AT_FUNC_F1 | |
143 | # undef AT_FUNC_F2 | |
144 | # undef AT_FUNC_USE_F1_COND | |
145 | # undef AT_FUNC_POST_FILE_PARAM_DECLS | |
146 | # undef AT_FUNC_POST_FILE_ARGS | |
147 | ||
148 | #endif /* !HAVE_FSTATAT */ |