1/* fstat() replacement.
2   Copyright (C) 2011-2012 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 <http://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#if _GL_WINDOWS_64_BIT_ST_SIZE
27# undef stat /* avoid warning on mingw64 with _FILE_OFFSET_BITS=64 */
28# define stat _stati64
29# undef fstat /* avoid warning on mingw64 with _FILE_OFFSET_BITS=64 */
30# define fstat _fstati64
31#endif
32#undef __need_system_sys_stat_h
33
34static int
35orig_fstat (int fd, struct stat *buf)
36{
37  return fstat (fd, buf);
38}
39
40/* Specification.  */
41/* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
42   eliminates this include because of the preliminary #include <sys/stat.h>
43   above.  */
44#include "sys/stat.h"
45
46#include <errno.h>
47#include <unistd.h>
48
49#if HAVE_MSVC_INVALID_PARAMETER_HANDLER
50# include "msvc-inval.h"
51#endif
52
53#if HAVE_MSVC_INVALID_PARAMETER_HANDLER
54static int
55fstat_nothrow (int fd, struct stat *buf)
56{
57  int result;
58
59  TRY_MSVC_INVAL
60    {
61      result = orig_fstat (fd, buf);
62    }
63  CATCH_MSVC_INVAL
64    {
65      result = -1;
66      errno = EBADF;
67    }
68  DONE_MSVC_INVAL;
69
70  return result;
71}
72#else
73# define fstat_nothrow orig_fstat
74#endif
75
76int
77rpl_fstat (int fd, struct stat *buf)
78{
79#if REPLACE_FCHDIR && REPLACE_OPEN_DIRECTORY
80  /* Handle the case when rpl_open() used a dummy file descriptor to work
81     around an open() that can't normally visit directories.  */
82  const char *name = _gl_directory_name (fd);
83  if (name != NULL)
84    return stat (name, buf);
85#endif
86
87  return fstat_nothrow (fd, buf);
88}
89