sysdeps/unix/sysv/linux/i386/xstat.c

   1 /* xstat using old-style Unix stat system call.
   2    Copyright (C) 1991,95,96,97,98,2000,2002,2003,2006
   3         Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 /* Ho hum, if xstat == xstat64 we must get rid of the prototype or gcc
  22    will complain since they don't strictly match.  */
  23 #define __xstat64 __xstat64_disable
  24
  25 #include <errno.h>
  26 #include <stddef.h>
  27 #include <sys/stat.h>
  28 #include <kernel_stat.h>
  29
  30 #include <sysdep.h>
  31 #include <sys/syscall.h>
  32 #include <bp-checks.h>
  33
  34 #include <kernel-features.h>
  35
  36 #include <xstatconv.h>
  37
  38 #ifdef __NR_stat64
  39 # if __ASSUME_STAT64_SYSCALL == 0
  40 /* The variable is shared between all wrappers around *stat64 calls.  */
  41 extern int __have_no_stat64;
  42 # endif
  43 #endif
  44
  45
  46 /* Get information about the file NAME in BUF.  */
  47 int
  48 __xstat (int vers, const char *name, struct stat *buf)
  49 {
  50 #if __ASSUME_STAT64_SYSCALL == 0
  51   struct kernel_stat kbuf;
  52 #endif
  53   int result;
  54
  55   if (vers == _STAT_VER_KERNEL)
  56     return INLINE_SYSCALL (stat, 2, CHECK_STRING (name), CHECK_1 ((struct kernel_stat *) buf));
  57
  58 #if __ASSUME_STAT64_SYSCALL > 0
  59   {
  60     struct stat64 buf64;
  61
  62     result = INLINE_SYSCALL (stat64, 2, CHECK_STRING (name), __ptrvalue (&buf64));
  63     if (result == 0)
  64       result = __xstat32_conv (vers, &buf64, buf);
  65     return result;
  66   }
  67 #else
  68 # if defined __NR_stat64
  69   /* To support 32 bit UIDs, we have to use stat64.  The normal stat call only returns
  70      16 bit UIDs.  */
  71   if (! __have_no_stat64)
  72     {
  73       struct stat64 buf64;
  74
  75       result = INLINE_SYSCALL (stat64, 2, CHECK_STRING (name), __ptrvalue (&buf64));
  76
  77       if (result == 0)
  78         result = __xstat32_conv (vers, &buf64, buf);
  79
  80       if (result != -1 || errno != ENOSYS)
  81         return result;
  82
  83       __have_no_stat64 = 1;
  84     }
  85 # endif
  86   result = INLINE_SYSCALL (stat, 2, CHECK_STRING (name), __ptrvalue (&kbuf));
  87   if (result == 0)
  88     result = __xstat_conv (vers, &kbuf, buf);
  89
  90   return result;
  91 #endif  /* __ASSUME_STAT64_SYSCALL  */
  92 }
  93 hidden_def (__xstat)
  94 weak_alias (__xstat, _xstat);
  95 #ifdef XSTAT_IS_XSTAT64
  96 # undef __xstat64
  97 strong_alias (__xstat, __xstat64);
  98 hidden_ver (__xstat, __xstat64)
  99 #endif