sysdeps/unix/sysv/linux/xstat64.c

   1 /* xstat64 using old-style Unix stat system call.
   2    Copyright (C) 1991, 95, 96, 97, 98, 99, 00 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 <bp-checks.h>
  28
  29 #include "kernel-features.h"
  30
  31 #if __ASSUME_STAT64_SYSCALL == 0
  32 # include <xstatconv.c>
  33 #endif
  34
  35 extern int __syscall_stat (const char *__unbounded, struct kernel_stat *__unbounded);
  36
  37 #ifdef __NR_stat64
  38 extern int __syscall_stat64 (const char *__unbounded, struct stat64 *__unbounded);
  39 # if  __ASSUME_STAT64_SYSCALL == 0
  40 /* The variable is shared between all wrappers around *stat64 calls.
  41    This is the definition.  */
  42 int __have_no_stat64;
  43 # endif
  44 #endif
  45
  46 /* Get information about the file NAME in BUF.  */
  47
  48 int
  49 __xstat64 (int vers, const char *name, struct stat64 *buf)
  50 {
  51 #if __ASSUME_STAT64_SYSCALL > 0
  52   return INLINE_SYSCALL (stat64, 2, CHECK_STRING (name), CHECK_1 (buf));
  53 #else
  54   struct kernel_stat kbuf;
  55   int result;
  56 # if defined __NR_stat64
  57   if (! __have_no_stat64)
  58     {
  59       int saved_errno = errno;
  60       result = INLINE_SYSCALL (stat64, 2, CHECK_STRING (name), CHECK_1 (buf));
  61
  62       if (result != -1 || errno != ENOSYS)
  63         return result;
  64
  65       __set_errno (saved_errno);
  66       __have_no_stat64 = 1;
  67     }
  68 # endif
  69
  70   result = INLINE_SYSCALL (stat, 2, CHECK_STRING (name), __ptrvalue (&kbuf));
  71   if (result == 0)
  72     result = xstat64_conv (vers, &kbuf, buf);
  73
  74   return result;
  75 #endif
  76 }