1 /* fstat() replacement.
2 Copyright (C) 2011-2018 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 /* If the user's config.h happens to include <sys/stat.h>, let it include only
18 the system's <sys/stat.h> here, so that orig_fstat doesn't recurse to
19 rpl_fstat. */
20 #define __need_system_sys_stat_h
21 #include <config.h>
22
23 /* Get the original definition of fstat. It might be defined as a macro. */
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #undef __need_system_sys_stat_h
27
28 #if defined _WIN32 && ! defined __CYGWIN__
29 # define WINDOWS_NATIVE
30 #endif
31
32 #if !defined WINDOWS_NATIVE
33
34 static int
orig_fstat(int fd,struct stat * buf)35 orig_fstat (int fd, struct stat *buf)
36 {
37 return fstat (fd, buf);
38 }
39
40 #endif
41
42 /* Specification. */
43 /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
44 eliminates this include because of the preliminary #include <sys/stat.h>
45 above. */
46 #include "sys/stat.h"
47
48 #include "stat-time.h"
49
50 #include <errno.h>
51 #include <unistd.h>
52 #ifdef WINDOWS_NATIVE
53 # define WIN32_LEAN_AND_MEAN
54 # include <windows.h>
55 # if GNULIB_MSVC_NOTHROW
56 # include "msvc-nothrow.h"
57 # else
58 # include <io.h>
59 # endif
60 # include "stat-w32.h"
61 #endif
62
63 int
rpl_fstat(int fd,struct stat * buf)64 rpl_fstat (int fd, struct stat *buf)
65 {
66 #if REPLACE_FCHDIR && REPLACE_OPEN_DIRECTORY
67 /* Handle the case when rpl_open() used a dummy file descriptor to work
68 around an open() that can't normally visit directories. */
69 const char *name = _gl_directory_name (fd);
70 if (name != NULL)
71 return stat (name, buf);
72 #endif
73
74 #ifdef WINDOWS_NATIVE
75 /* Fill the fields ourselves, because the original fstat function returns
76 values for st_atime, st_mtime, st_ctime that depend on the current time
77 zone. See
78 <https://lists.gnu.org/r/bug-gnulib/2017-04/msg00134.html> */
79 HANDLE h = (HANDLE) _get_osfhandle (fd);
80
81 if (h == INVALID_HANDLE_VALUE)
82 {
83 errno = EBADF;
84 return -1;
85 }
86 return _gl_fstat_by_handle (h, NULL, buf);
87 #else
88 return stat_time_normalize (orig_fstat (fd, buf), buf);
89 #endif
90 }
91