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glibc  2.9
lxstat64.c
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00001 /* lxstat64 using old-style Unix lstat system call.
00002    Copyright (C) 1997-2002,2003,2006 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <stddef.h>
00022 #include <sys/stat.h>
00023 #include <kernel_stat.h>
00024 
00025 #include <sysdep.h>
00026 #include <sys/syscall.h>
00027 #include <bp-checks.h>
00028 
00029 #include <kernel-features.h>
00030 
00031 #if __ASSUME_STAT64_SYSCALL == 0
00032 # include <xstatconv.h>
00033 #endif
00034 
00035 #ifdef __NR_lstat64
00036 # if  __ASSUME_STAT64_SYSCALL == 0
00037 /* The variable is shared between all wrappers around *stat64 calls.  */
00038 extern int __have_no_stat64;
00039 # endif
00040 #endif
00041 
00042 /* Get information about the file NAME in BUF.  */
00043 int
00044 ___lxstat64 (int vers, const char *name, struct stat64 *buf)
00045 {
00046   int result;
00047 #ifdef __ASSUME_STAT64_SYSCALL
00048   result = INLINE_SYSCALL (lstat64, 2, CHECK_STRING (name), CHECK_1 (buf));
00049 # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
00050   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
00051     buf->st_ino = buf->__st_ino;
00052 # endif
00053   return result;
00054 #else
00055   struct kernel_stat kbuf;
00056 # ifdef __NR_lstat64
00057   if (! __have_no_stat64)
00058     {
00059       int saved_errno = errno;
00060       result = INLINE_SYSCALL (lstat64, 2, CHECK_STRING (name), CHECK_1 (buf));
00061 
00062       if (result != -1 || errno != ENOSYS)
00063        {
00064 #  if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
00065          if (!result && buf->__st_ino != (__ino_t) buf->st_ino)
00066            buf->st_ino = buf->__st_ino;
00067 #  endif
00068          return result;
00069        }
00070 
00071       __set_errno (saved_errno);
00072       __have_no_stat64 = 1;
00073     }
00074 # endif
00075   result = INLINE_SYSCALL (lstat, 2, CHECK_STRING (name), __ptrvalue (&kbuf));
00076   if (result == 0)
00077     result = __xstat64_conv (vers, &kbuf, buf);
00078 
00079   return result;
00080 #endif
00081 }
00082 
00083 #include <shlib-compat.h>
00084 
00085 #if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
00086 versioned_symbol (libc, ___lxstat64, __lxstat64, GLIBC_2_2);
00087 strong_alias (___lxstat64, __old__lxstat64)
00088 compat_symbol (libc, __old__lxstat64, __lxstat64, GLIBC_2_1);
00089 hidden_ver (___lxstat64, __lxstat64)
00090 #else
00091 strong_alias (___lxstat64, __lxstat64);
00092 hidden_def (__lxstat64)
00093 #endif