sysdeps/unix/sysv/linux/fxstat64.c

   1 /* fxstat64 using old-style Unix fstat system call.
   2    Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <stddef.h>
  22 #include <sys/stat.h>
  23 #include <kernel_stat.h>
  24
  25 #include <sysdep.h>
  26 #include <sys/syscall.h>
  27 #include "kernel-features.h"
  28
  29 #if __ASSUME_STAT64_SYSCALL == 0
  30 # include <xstatconv.c>
  31 #endif
  32
  33 extern int __syscall_fstat (int, struct kernel_stat *);
  34
  35 #ifdef __NR_fstat64
  36 extern int __syscall_fstat64 (int, struct stat64 *);
  37 # if  __ASSUME_STAT64_SYSCALL == 0
  38 /* The variable is shared between all wrappers around *stat64 calls.  */
  39 extern int __have_no_stat64;
  40 # endif
  41 #endif
  42
  43 /* Get information about the file FD in BUF.  */
  44 int
  45 __fxstat64 (int vers, int fd, struct stat64 *buf)
  46 {
  47 #if __ASSUME_STAT64_SYSCALL > 0
  48   return INLINE_SYSCALL (fstat64, 2, fd, buf);
  49 #else
  50   int result;
  51   struct kernel_stat kbuf;
  52 # if defined __NR_fstat64
  53   if (! __have_no_stat64)
  54     {
  55       int saved_errno = errno;
  56       result = INLINE_SYSCALL (fstat64, 2, fd, buf);
  57
  58       if (result != -1 || errno != ENOSYS)
  59         return result;
  60
  61       __set_errno (saved_errno);
  62       __have_no_stat64 = 1;
  63     }
  64 # endif
  65   result = INLINE_SYSCALL (fstat, 2, fd, &kbuf);
  66   if (result == 0)
  67     result = xstat64_conv (vers, &kbuf, buf);
  68
  69   return result;
  70 #endif
  71 }