gsasl  1.10.0
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fstat.c
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1 /* fstat() replacement.
2  Copyright (C) 2011-2021 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
35 orig_fstat (int fd, struct stat *buf)
36 {
37  return fstat (fd, buf);
38 }
39 
40 #endif
41 
42 /* Specification. */
43 #ifdef __osf__
44 /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
45  eliminates this include because of the preliminary #include <sys/stat.h>
46  above. */
47 # include "sys/stat.h"
48 #else
49 # include <sys/stat.h>
50 #endif
51 
52 #include "stat-time.h"
53 
54 #include <errno.h>
55 #include <unistd.h>
56 #ifdef WINDOWS_NATIVE
57 # define WIN32_LEAN_AND_MEAN
58 # include <windows.h>
59 # if GNULIB_MSVC_NOTHROW
60 # include "msvc-nothrow.h"
61 # else
62 # include <io.h>
63 # endif
64 # include "stat-w32.h"
65 #endif
66 
67 int
68 rpl_fstat (int fd, struct stat *buf)
69 {
70 #if REPLACE_FCHDIR && REPLACE_OPEN_DIRECTORY
71  /* Handle the case when rpl_open() used a dummy file descriptor to work
72  around an open() that can't normally visit directories. */
73  const char *name = _gl_directory_name (fd);
74  if (name != NULL)
75  return stat (name, buf);
76 #endif
77 
78 #ifdef WINDOWS_NATIVE
79  /* Fill the fields ourselves, because the original fstat function returns
80  values for st_atime, st_mtime, st_ctime that depend on the current time
81  zone. See
82  <https://lists.gnu.org/r/bug-gnulib/2017-04/msg00134.html> */
83  HANDLE h = (HANDLE) _get_osfhandle (fd);
84 
85  if (h == INVALID_HANDLE_VALUE)
86  {
87  errno = EBADF;
88  return -1;
89  }
90  return _gl_fstat_by_handle (h, NULL, buf);
91 #else
92  return stat_time_normalize (orig_fstat (fd, buf), buf);
93 #endif
94 }
int rpl_fstat(int fd, struct stat *buf)
Definition: fstat.c:68
static int orig_fstat(int fd, struct stat *buf)
Definition: fstat.c:35
_GL_INLINE int stat_time_normalize(int result, struct stat *st _GL_UNUSED)
Definition: stat-time.h:211
int _gl_fstat_by_handle(HANDLE h, const char *path, struct stat *buf)
#define NULL
Definition: stddef.in.h:72
const char * name
Definition: error.c:43
char buf[4]
Definition: mbrtowc-impl.h:39