sysdeps/unix/sysv/linux/fxstat64.c

   1 /* fxstat64 using old-style Unix fstat system call.
   2    Copyright (C) 1997-2002, 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_fstat64
  36 # if  __ASSUME_STAT64_SYSCALL == 0
  37 /* The variable is shared between all wrappers around *stat64 calls.  */
  38 extern int __have_no_stat64;
  39 # endif
  40 #endif
  41
  42 /* Get information about the file FD in BUF.  */
  43
  44 int
  45 ___fxstat64 (int vers, int fd, struct stat64 *buf)
  46 {
  47   int result;
  48 #if __ASSUME_STAT64_SYSCALL > 0
  49   result = INLINE_SYSCALL (fstat64, 2, fd, CHECK_1 (buf));
  50 # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  51   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
  52     buf->st_ino = buf->__st_ino;
  53 # endif
  54   return result;
  55 #else
  56   struct kernel_stat kbuf;
  57 # if defined __NR_fstat64
  58   if (! __have_no_stat64)
  59     {
  60       int saved_errno = errno;
  61       result = INLINE_SYSCALL (fstat64, 2, fd, CHECK_1 (buf));
  62
  63       if (result != -1 || errno != ENOSYS)
  64         {
  65 #  if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  66           if (!result && buf->__st_ino != (__ino_t)buf->st_ino)
  67             buf->st_ino = buf->__st_ino;
  68 #  endif
  69           return result;
  70         }
  71
  72       __set_errno (saved_errno);
  73       __have_no_stat64 = 1;
  74     }
  75 # endif
  76   result = INLINE_SYSCALL (fstat, 2, fd, __ptrvalue (&kbuf));
  77   if (result == 0)
  78     result = __xstat64_conv (vers, &kbuf, buf);
  79
  80   return result;
  81 #endif
  82 }
  83
  84 #include <shlib-compat.h>
  85
  86 #if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
  87 versioned_symbol (libc, ___fxstat64, __fxstat64, GLIBC_2_2);
  88 strong_alias (___fxstat64, __old__fxstat64)
  89 compat_symbol (libc, __old__fxstat64, __fxstat64, GLIBC_2_1);
  90 hidden_ver (___fxstat64, __fxstat64)
  91 #else
  92 strong_alias (___fxstat64, __fxstat64)
  93 hidden_def (__fxstat64)
  94 #endif