sysdeps/unix/sysv/linux/xstat.c

   1 /* xstat using old-style Unix stat system call.
   2    Copyright (C) 1991-2018 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 /* Ho hum, if xstat == xstat64 we must get rid of the prototype or gcc
  20    will complain since they don't strictly match.  */
  21 #define __xstat64 __xstat64_disable
  22
  23 #include <errno.h>
  24 #include <stddef.h>
  25 #include <sys/stat.h>
  26 #include <kernel_stat.h>
  27
  28 #include <sysdep.h>
  29 #include <sys/syscall.h>
  30
  31 #include <xstatconv.h>
  32
  33 /* Get information about the file NAME in BUF.  */
  34 int
  35 __xstat (int vers, const char *name, struct stat *buf)
  36 {
  37   if (vers == _STAT_VER_KERNEL)
  38     return INLINE_SYSCALL (stat, 2, name, buf);
  39
  40 #ifdef STAT_IS_KERNEL_STAT
  41   return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
  42 #else
  43   struct kernel_stat kbuf;
  44   int result;
  45
  46   result = INLINE_SYSCALL (stat, 2, name, &kbuf);
  47   if (result == 0)
  48     result = __xstat_conv (vers, &kbuf, buf);
  49
  50   return result;
  51 #endif
  52 }
  53 hidden_def (__xstat)
  54 weak_alias (__xstat, _xstat);
  55 #if XSTAT_IS_XSTAT64
  56 #undef __xstat64
  57 strong_alias (__xstat, __xstat64);
  58 hidden_ver (__xstat, __xstat64)
  59 #endif