sysdeps/unix/sysv/linux/xstat64.c

   1 /* xstat64 using old-style Unix stat system call.
   2    Copyright (C) 1991,1995-2002,2003,2006 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_stat64
  36 # if  __ASSUME_STAT64_SYSCALL == 0
  37 /* The variable is shared between all wrappers around *stat64 calls.
  38    This is the definition.  */
  39 int __have_no_stat64;
  40 # endif
  41 #endif
  42
  43 /* Get information about the file NAME in BUF.  */
  44
  45 int
  46 ___xstat64 (int vers, const char *name, struct stat64 *buf)
  47 {
  48   int result;
  49 #if __ASSUME_STAT64_SYSCALL > 0
  50   result = INLINE_SYSCALL (stat64, 2, CHECK_STRING (name), CHECK_1 (buf));
  51 # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  52   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
  53     buf->st_ino = buf->__st_ino;
  54 # endif
  55   return result;
  56 #else
  57   struct kernel_stat kbuf;
  58 # if defined __NR_stat64
  59   if (! __have_no_stat64)
  60     {
  61       int saved_errno = errno;
  62       result = INLINE_SYSCALL (stat64, 2, CHECK_STRING (name), CHECK_1 (buf));
  63
  64       if (result != -1 || errno != ENOSYS)
  65         {
  66 #  if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  67           if (!result && buf->__st_ino != (__ino_t) buf->st_ino)
  68             buf->st_ino = buf->__st_ino;
  69 #  endif
  70           return result;
  71         }
  72
  73       __set_errno (saved_errno);
  74       __have_no_stat64 = 1;
  75     }
  76 # endif
  77
  78   result = INLINE_SYSCALL (stat, 2, CHECK_STRING (name), __ptrvalue (&kbuf));
  79   if (result == 0)
  80     result = __xstat64_conv (vers, &kbuf, buf);
  81
  82   return result;
  83 #endif
  84 }
  85
  86
  87 #include <shlib-compat.h>
  88
  89 #if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
  90 versioned_symbol (libc, ___xstat64, __xstat64, GLIBC_2_2);
  91 strong_alias (___xstat64, __old__xstat64)
  92 compat_symbol (libc, __old__xstat64, __xstat64, GLIBC_2_1);
  93 hidden_ver (___xstat64, __xstat64)
  94 #else
  95 strong_alias (___xstat64, __xstat64)
  96 hidden_def (__xstat64)
  97 #endif