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glibc  2.9
xstat64.c
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00001 /* xstat64 using old-style Unix stat system call.
00002    Copyright (C) 1991,1995-2002,2003,2006 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_stat64
00036 # if  __ASSUME_STAT64_SYSCALL == 0
00037 /* The variable is shared between all wrappers around *stat64 calls.
00038    This is the definition.  */
00039 int __have_no_stat64;
00040 # endif
00041 #endif
00042 
00043 /* Get information about the file NAME in BUF.  */
00044 
00045 int
00046 ___xstat64 (int vers, const char *name, struct stat64 *buf)
00047 {
00048   int result;
00049 #if __ASSUME_STAT64_SYSCALL > 0
00050   result = INLINE_SYSCALL (stat64, 2, CHECK_STRING (name), CHECK_1 (buf));
00051 # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
00052   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
00053     buf->st_ino = buf->__st_ino;
00054 # endif
00055   return result;
00056 #else
00057   struct kernel_stat kbuf;
00058 # if defined __NR_stat64
00059   if (! __have_no_stat64)
00060     {
00061       int saved_errno = errno;
00062       result = INLINE_SYSCALL (stat64, 2, CHECK_STRING (name), CHECK_1 (buf));
00063 
00064       if (result != -1 || errno != ENOSYS)
00065        {
00066 #  if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
00067          if (!result && buf->__st_ino != (__ino_t) buf->st_ino)
00068            buf->st_ino = buf->__st_ino;
00069 #  endif
00070          return result;
00071        }
00072 
00073       __set_errno (saved_errno);
00074       __have_no_stat64 = 1;
00075     }
00076 # endif
00077 
00078   result = INLINE_SYSCALL (stat, 2, CHECK_STRING (name), __ptrvalue (&kbuf));
00079   if (result == 0)
00080     result = __xstat64_conv (vers, &kbuf, buf);
00081 
00082   return result;
00083 #endif
00084 }
00085 
00086 
00087 #include <shlib-compat.h>
00088 
00089 #if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
00090 versioned_symbol (libc, ___xstat64, __xstat64, GLIBC_2_2);
00091 strong_alias (___xstat64, __old__xstat64)
00092 compat_symbol (libc, __old__xstat64, __xstat64, GLIBC_2_1);
00093 hidden_ver (___xstat64, __xstat64)
00094 #else
00095 strong_alias (___xstat64, __xstat64)
00096 hidden_def (__xstat64)
00097 #endif