1  /* fstat() replacement.
       2     Copyright (C) 2011-2023 Free Software Foundation, Inc.
       3  
       4     This file is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU Lesser General Public License as
       6     published by the Free Software Foundation; either version 2.1 of the
       7     License, or (at your option) any later version.
       8  
       9     This file 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 Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser 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  }