sysdeps/unix/sysv/linux/xstat64.c

   1 /* xstat64 using old-style Unix stat system call.
   2    Copyright (C) 1991, 1995-2002, 2003 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 extern int __syscall_stat (const char *__unbounded,
  36                            struct kernel_stat *__unbounded);
  37
  38 #ifdef __NR_stat64
  39 extern int __syscall_stat64 (const char *__unbounded,
  40                              struct stat64 *__unbounded);
  41 # if  __ASSUME_STAT64_SYSCALL == 0
  42 /* The variable is shared between all wrappers around *stat64 calls.
  43    This is the definition.  */
  44 int __have_no_stat64;
  45 # endif
  46 #endif
  47
  48 /* Get information about the file NAME in BUF.  */
  49
  50 int
  51 ___xstat64 (int vers, const char *name, struct stat64 *buf)
  52 {
  53   int result;
  54 #if __ASSUME_STAT64_SYSCALL > 0
  55   result = INLINE_SYSCALL (stat64, 2, CHECK_STRING (name), CHECK_1 (buf));
  56 # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  57   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
  58     buf->st_ino = buf->__st_ino;
  59 # endif
  60   return result;
  61 #else
  62   struct kernel_stat kbuf;
  63 # if defined __NR_stat64
  64   if (! __have_no_stat64)
  65     {
  66       int saved_errno = errno;
  67       result = INLINE_SYSCALL (stat64, 2, CHECK_STRING (name), CHECK_1 (buf));
  68
  69       if (result != -1 || errno != ENOSYS)
  70         {
  71 #  if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  72           if (!result && buf->__st_ino != (__ino_t) buf->st_ino)
  73             buf->st_ino = buf->__st_ino;
  74 #  endif
  75           return result;
  76         }
  77
  78       __set_errno (saved_errno);
  79       __have_no_stat64 = 1;
  80     }
  81 # endif
  82
  83   result = INLINE_SYSCALL (stat, 2, CHECK_STRING (name), __ptrvalue (&kbuf));
  84   if (result == 0)
  85     result = __xstat64_conv (vers, &kbuf, buf);
  86
  87   return result;
  88 #endif
  89 }
  90
  91
  92 #include <shlib-compat.h>
  93
  94 #if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
  95 versioned_symbol (libc, ___xstat64, __xstat64, GLIBC_2_2);
  96 strong_alias (___xstat64, __old__xstat64)
  97 compat_symbol (libc, __old__xstat64, __xstat64, GLIBC_2_1);
  98 hidden_ver (___xstat64, __xstat64)
  99 #else
 100 strong_alias (___xstat64, __xstat64)
 101 hidden_def (__xstat64)
 102 #endif