sysdeps/unix/sysv/linux/lxstat64.c

   1 /* lxstat64 using old-style Unix lstat system call.
   2    Copyright (C) 1997,1998,1999,2000,2001,2002 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 #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 #undef __lxstat64
  36
  37 extern int __syscall_lstat (const char *__unbounded,
  38                             struct kernel_stat *__unbounded);
  39
  40 #ifdef __NR_lstat64
  41 extern int __syscall_lstat64 (const char *__unbounded,
  42                               struct stat64 *__unbounded);
  43 # if  __ASSUME_STAT64_SYSCALL == 0
  44 /* The variable is shared between all wrappers around *stat64 calls.  */
  45 extern int __have_no_stat64;
  46 # endif
  47 #endif
  48
  49 /* Get information about the file NAME in BUF.  */
  50 extern int ___lxstat64 (int vers, const char *name, struct stat64 *buf);
  51
  52 int
  53 ___lxstat64 (int vers, const char *name, struct stat64 *buf)
  54 {
  55   int result;
  56 #ifdef __ASSUME_STAT64_SYSCALL
  57   result = INLINE_SYSCALL (lstat64, 2, CHECK_STRING (name), CHECK_1 (buf));
  58 # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  59   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
  60     buf->st_ino = buf->__st_ino;
  61 # endif
  62   return result;
  63 #else
  64   struct kernel_stat kbuf;
  65 # ifdef __NR_lstat64
  66   if (! __have_no_stat64)
  67     {
  68       int saved_errno = errno;
  69       result = INLINE_SYSCALL (lstat64, 2, CHECK_STRING (name), CHECK_1 (buf));
  70
  71       if (result != -1 || errno != ENOSYS)
  72         {
  73 #  if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  74           if (!result && buf->__st_ino != (__ino_t) buf->st_ino)
  75             buf->st_ino = buf->__st_ino;
  76 #  endif
  77           return result;
  78         }
  79
  80       __set_errno (saved_errno);
  81       __have_no_stat64 = 1;
  82     }
  83 # endif
  84   result = INLINE_SYSCALL (lstat, 2, CHECK_STRING (name), __ptrvalue (&kbuf));
  85   if (result == 0)
  86     result = xstat64_conv (vers, &kbuf, buf);
  87
  88   return result;
  89 #endif
  90 }
  91
  92 #ifndef RTLD_STAT64
  93 # include <shlib-compat.h>
  94
  95 versioned_symbol (libc, ___lxstat64, __lxstat64, GLIBC_2_2);
  96
  97 # if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
  98 strong_alias (___lxstat64, __old__lxstat64)
  99 compat_symbol (libc, __old__lxstat64, __lxstat64, GLIBC_2_1);
 100 # endif
 101
 102 #else
 103 strong_alias (___lxstat64, __lxstat64);
 104 #endif
 105 INTDEF2(___lxstat64, __lxstat64)