gl/fstat.c

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