1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/* Work around an fstatat bug on Solaris 9.
Copyright (C) 2006, 2009-2021 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Paul Eggert and Jim Meyering. */
/* If the user's config.h happens to include <sys/stat.h>, let it include only
the system's <sys/stat.h> here, so that orig_fstatat doesn't recurse to
rpl_fstatat. */
#define __need_system_sys_stat_h
#include <config.h>
/* Get the original definition of fstatat. It might be defined as a macro. */
#include <sys/types.h>
#include <sys/stat.h>
#undef __need_system_sys_stat_h
#if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG
static int
orig_fstatat (int fd, char const *filename, struct stat *buf, int flags)
{
return fstatat (fd, filename, buf, flags);
}
#endif
#ifdef __osf__
/* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
eliminates this include because of the preliminary #include <sys/stat.h>
above. */
# include "sys/stat.h"
#else
# include <sys/stat.h>
#endif
#include "stat-time.h"
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG
# ifndef LSTAT_FOLLOWS_SLASHED_SYMLINK
# define LSTAT_FOLLOWS_SLASHED_SYMLINK 0
# endif
static int
normal_fstatat (int fd, char const *file, struct stat *st, int flag)
{
return stat_time_normalize (orig_fstatat (fd, file, st, flag), st);
}
/* fstatat should always follow symbolic links that end in /, but on
Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified.
Likewise, trailing slash on a non-directory should be an error.
These are the same problems that lstat.c and stat.c address, so
solve it in a similar way.
AIX 7.1 fstatat (AT_FDCWD, ..., 0) always fails, which is a bug.
Work around this bug if FSTATAT_AT_FDCWD_0_BROKEN is nonzero. */
int
rpl_fstatat (int fd, char const *file, struct stat *st, int flag)
{
int result = normal_fstatat (fd, file, st, flag);
size_t len;
if (LSTAT_FOLLOWS_SLASHED_SYMLINK || result != 0)
return result;
len = strlen (file);
if (flag & AT_SYMLINK_NOFOLLOW)
{
/* Fix lstat behavior. */
if (file[len - 1] != '/' || S_ISDIR (st->st_mode))
return 0;
if (!S_ISLNK (st->st_mode))
{
errno = ENOTDIR;
return -1;
}
result = normal_fstatat (fd, file, st, flag & ~AT_SYMLINK_NOFOLLOW);
}
/* Fix stat behavior. */
if (result == 0 && !S_ISDIR (st->st_mode) && file[len - 1] == '/')
{
errno = ENOTDIR;
return -1;
}
return result;
}
#else /* ! (HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG) */
/* On mingw, the gnulib <sys/stat.h> defines 'stat' as a function-like
macro; but using it in AT_FUNC_F2 causes compilation failure
because the preprocessor sees a use of a macro that requires two
arguments but is only given one. Hence, we need an inline
forwarder to get past the preprocessor. */
static int
stat_func (char const *name, struct stat *st)
{
return stat (name, st);
}
/* Likewise, if there is no native 'lstat', then the gnulib
<sys/stat.h> defined it as stat, which also needs adjustment. */
# if !HAVE_LSTAT
# undef lstat
# define lstat stat_func
# endif
/* Replacement for Solaris' function by the same name.
<https://www.google.com/search?q=fstatat+site:docs.oracle.com>
First, try to simulate it via l?stat ("/proc/self/fd/FD/FILE").
Failing that, simulate it via save_cwd/fchdir/(stat|lstat)/restore_cwd.
If either the save_cwd or the restore_cwd fails (relatively unlikely),
then give a diagnostic and exit nonzero.
Otherwise, this function works just like Solaris' fstatat. */
# define AT_FUNC_NAME fstatat
# define AT_FUNC_F1 lstat
# define AT_FUNC_F2 stat_func
# define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW
# define AT_FUNC_POST_FILE_PARAM_DECLS , struct stat *st, int flag
# define AT_FUNC_POST_FILE_ARGS , st
# include "at-func.c"
# undef AT_FUNC_NAME
# undef AT_FUNC_F1
# undef AT_FUNC_F2
# undef AT_FUNC_USE_F1_COND
# undef AT_FUNC_POST_FILE_PARAM_DECLS
# undef AT_FUNC_POST_FILE_ARGS
#endif /* !HAVE_FSTATAT */
|
