sysdeps/unix/sysv/linux/lxstat64.c

   1 /* lxstat64 using old-style Unix lstat system call.
   2    Copyright (C) 1997-2002,2003,2006 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 #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.h>
  33 #endif
  34
  35 #ifdef __NR_lstat64
  36 # if  __ASSUME_STAT64_SYSCALL == 0
  37 /* The variable is shared between all wrappers around *stat64 calls.  */
  38 extern int __have_no_stat64;
  39 # endif
  40 #endif
  41
  42 /* Get information about the file NAME in BUF.  */
  43 int
  44 ___lxstat64 (int vers, const char *name, struct stat64 *buf)
  45 {
  46   int result;
  47 #ifdef __ASSUME_STAT64_SYSCALL
  48   result = INLINE_SYSCALL (lstat64, 2, CHECK_STRING (name), CHECK_1 (buf));
  49 # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  50   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
  51     buf->st_ino = buf->__st_ino;
  52 # endif
  53   return result;
  54 #else
  55   struct kernel_stat kbuf;
  56 # ifdef __NR_lstat64
  57   if (! __have_no_stat64)
  58     {
  59       int saved_errno = errno;
  60       result = INLINE_SYSCALL (lstat64, 2, CHECK_STRING (name), CHECK_1 (buf));
  61
  62       if (result != -1 || errno != ENOSYS)
  63         {
  64 #  if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  65           if (!result && buf->__st_ino != (__ino_t) buf->st_ino)
  66             buf->st_ino = buf->__st_ino;
  67 #  endif
  68           return result;
  69         }
  70
  71       __set_errno (saved_errno);
  72       __have_no_stat64 = 1;
  73     }
  74 # endif
  75   result = INLINE_SYSCALL (lstat, 2, CHECK_STRING (name), __ptrvalue (&kbuf));
  76   if (result == 0)
  77     result = __xstat64_conv (vers, &kbuf, buf);
  78
  79   return result;
  80 #endif
  81 }
  82
  83 #include <shlib-compat.h>
  84
  85 #if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
  86 versioned_symbol (libc, ___lxstat64, __lxstat64, GLIBC_2_2);
  87 strong_alias (___lxstat64, __old__lxstat64)
  88 compat_symbol (libc, __old__lxstat64, __lxstat64, GLIBC_2_1);
  89 hidden_ver (___lxstat64, __lxstat64)
  90 #else
  91 strong_alias (___lxstat64, __lxstat64);
  92 hidden_def (__lxstat64)
  93 #endif