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

   1 /* lxstat using old-style Unix lstat system call.
   2    Copyright (C) 1991,95,96,97,98,2000,2002 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* Ho hum, if xstat == xstat64 we must get rid of the prototype or gcc
  21    will complain since they don't strictly match.  */
  22 #define __lxstat64 __lxstat64_disable
  23
  24 #include <errno.h>
  25 #include <stddef.h>
  26 #include <sys/stat.h>
  27 #include <kernel_stat.h>
  28
  29 #include <sysdep.h>
  30 #include <sys/syscall.h>
  31 #include <bp-checks.h>
  32
  33 #include "kernel-features.h"
  34
  35 #include <xstatconv.c>
  36
  37 #undef __lxstat
  38
  39 extern int __syscall_lstat (const char *__unbounded,
  40                             struct kernel_stat *__unbounded);
  41
  42 #ifdef __NR_stat64
  43 extern int __syscall_lstat64 (const char *__unbounded,
  44                               struct stat64 *__unbounded);
  45 # if  __ASSUME_STAT64_SYSCALL == 0
  46 /* The variable is shared between all wrappers around *stat64 calls.  */
  47 extern int __have_no_stat64;
  48 # endif
  49 #endif
  50
  51
  52 /* Get information about the file NAME in BUF.  */
  53 int
  54 __lxstat (int vers, const char *name, struct stat *buf)
  55 {
  56 #if __ASSUME_STAT64_SYSCALL == 0
  57   struct kernel_stat kbuf;
  58 #endif
  59   int result;
  60
  61   if (vers == _STAT_VER_KERNEL)
  62     return INLINE_SYSCALL (lstat, 2, CHECK_STRING (name), CHECK_1 ((struct kernel_stat *) buf));
  63
  64 #if __ASSUME_STAT64_SYSCALL > 0
  65   {
  66     struct stat64 buf64;
  67
  68     result = INLINE_SYSCALL (lstat64, 2, CHECK_STRING (name), __ptrvalue (&buf64));
  69     if (result == 0)
  70       result = xstat32_conv (vers, &buf64, buf);
  71     return result;
  72   }
  73 #else
  74
  75 # if defined __NR_stat64
  76   /* To support 32 bit UIDs, we have to use stat64.  The normal stat call only returns
  77      16 bit UIDs.  */
  78   if (! __have_no_stat64)
  79     {
  80       struct stat64 buf64;
  81       result = INLINE_SYSCALL (lstat64, 2, CHECK_STRING (name), __ptrvalue (&buf64));
  82
  83       if (result == 0)
  84         result = xstat32_conv (vers, &buf64, buf);
  85
  86       if (result != -1 || errno != ENOSYS)
  87         return result;
  88
  89       __have_no_stat64 = 1;
  90     }
  91 # endif
  92
  93   result = INLINE_SYSCALL (lstat, 2, CHECK_STRING (name), __ptrvalue (&kbuf));
  94   if (result == 0)
  95     result = xstat_conv (vers, &kbuf, buf);
  96
  97   return result;
  98 #endif
  99 }
 100
 101 INTDEF(__lxstat)
 102 weak_alias (__lxstat, _lxstat);
 103 #ifdef XSTAT_IS_XSTAT64
 104 #undef __lxstat64
 105 INTDEF(__lxstat64)
 106 strong_alias (__lxstat, __lxstat64);
 107 #endif