/* fstat() replacement.

   Copyright (C) 2011-2017 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 <http://www.gnu.org/licenses/>.  */

/* 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_fstat doesn't recurse to

   rpl_fstat.  */

#define __need_system_sys_stat_h

#include <config.h>

/* Get the original definition of fstat.  It might be defined as a macro.  */

#include <sys/types.h>

#include <sys/stat.h>

#undef __need_system_sys_stat_h

#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__

# define WINDOWS_NATIVE

#endif

#if !defined WINDOWS_NATIVE

static int

orig_fstat (int fd, struct stat *buf)

{

  return fstat (fd, buf);

}

#endif

/* Specification.  */

/* 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"

#include <errno.h>

#include <unistd.h>

#ifdef WINDOWS_NATIVE

# define WIN32_LEAN_AND_MEAN

# include <windows.h>

# if GNULIB_MSVC_NOTHROW

#  include "msvc-nothrow.h"

# else

#  include <io.h>

# endif

# include "stat-w32.h"

#endif

int

rpl_fstat (int fd, struct stat *buf)

{

#if REPLACE_FCHDIR && REPLACE_OPEN_DIRECTORY

  /* Handle the case when rpl_open() used a dummy file descriptor to work

     around an open() that can't normally visit directories.  */

  const char *name = _gl_directory_name (fd);

  if (name != NULL)

    return stat (name, buf);

#endif

#ifdef WINDOWS_NATIVE

  /* Fill the fields ourselves, because the original fstat function returns

     values for st_atime, st_mtime, st_ctime that depend on the current time

     zone.  See

     <https://lists.gnu.org/archive/html/bug-gnulib/2017-04/msg00134.html>  */

  HANDLE h = (HANDLE) _get_osfhandle (fd);

  if (h == INVALID_HANDLE_VALUE)

    {

      errno = EBADF;

      return -1;

    }

  return _gl_fstat_by_handle (h, NULL, buf);

#else

  return orig_fstat (fd, buf);

#endif

}