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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stddef.h>
  21 #include <sys/stat.h>
  22 #include <kernel_stat.h>
  23
  24 #include <sysdep.h>
  25 #include <sys/syscall.h>
  26 #include <bp-checks.h>
  27
  28 #include <kernel-features.h>
  29
  30 #if __ASSUME_STAT64_SYSCALL == 0
  31 # include <xstatconv.h>
  32 #endif
  33
  34 #ifdef __NR_fstat64
  35 # if  __ASSUME_STAT64_SYSCALL == 0
  36 /* The variable is shared between all wrappers around *stat64 calls.  */
  37 extern int __have_no_stat64;
  38 # endif
  39 #endif
  40
  41 /* Get information about the file FD in BUF.  */
  42
  43 int
  44 ___fxstat64 (int vers, int fd, struct stat64 *buf)
  45 {
  46   int result;
  47 #if __ASSUME_STAT64_SYSCALL > 0
  48   result = INLINE_SYSCALL (fstat64, 2, fd, CHECK_1 (buf));
  49 # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  50   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
  51     buf->st_ino = buf->__st_ino;
  52 # endif
  53   return result;
  54 #else
  55   struct kernel_stat kbuf;
  56 # if defined __NR_fstat64
  57   if (! __have_no_stat64)
  58     {
  59       int saved_errno = errno;
  60       result = INLINE_SYSCALL (fstat64, 2, fd, CHECK_1 (buf));
  61
  62       if (result != -1 || errno != ENOSYS)
  63         {
  64 #  if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  65           if (!result && buf->__st_ino != (__ino_t)buf->st_ino)
  66             buf->st_ino = buf->__st_ino;
  67 #  endif
  68           return result;
  69         }
  70
  71       __set_errno (saved_errno);
  72       __have_no_stat64 = 1;
  73     }
  74 # endif
  75   result = INLINE_SYSCALL (fstat, 2, fd, __ptrvalue (&kbuf));
  76   if (result == 0)
  77     result = __xstat64_conv (vers, &kbuf, buf);
  78
  79   return result;
  80 #endif
  81 }
  82
  83 #include <shlib-compat.h>
  84
  85 #if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
  86 versioned_symbol (libc, ___fxstat64, __fxstat64, GLIBC_2_2);
  87 strong_alias (___fxstat64, __old__fxstat64)
  88 compat_symbol (libc, __old__fxstat64, __fxstat64, GLIBC_2_1);
  89 hidden_ver (___fxstat64, __fxstat64)
  90 #else
  91 strong_alias (___fxstat64, __fxstat64)
  92 hidden_def (__fxstat64)
  93 #endif