sysdeps/unix/sysv/linux/fxstat64.c

   1 /* fxstat64 using old-style Unix fstat system call.
   2    Copyright (C) 1997,1998,1999,2000,2001,2002 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.c>
  33 #endif
  34
  35 extern int __syscall_fstat (int, struct kernel_stat *__unbounded);
  36
  37 #ifdef __NR_fstat64
  38 extern int __syscall_fstat64 (int, struct stat64 *__unbounded);
  39 # if  __ASSUME_STAT64_SYSCALL == 0
  40 /* The variable is shared between all wrappers around *stat64 calls.  */
  41 extern int __have_no_stat64;
  42 # endif
  43 #endif
  44
  45 /* Get information about the file FD in BUF.  */
  46 extern int ___fxstat64 (int vers, int fd, struct stat64 *buf);
  47
  48 int
  49 ___fxstat64 (int vers, int fd, struct stat64 *buf)
  50 {
  51   int result;
  52 #if __ASSUME_STAT64_SYSCALL > 0
  53   result = INLINE_SYSCALL (fstat64, 2, fd, CHECK_1 (buf));
  54 # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  55   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
  56     buf->st_ino = buf->__st_ino;
  57 # endif
  58   return result;
  59 #else
  60   struct kernel_stat kbuf;
  61 # if defined __NR_fstat64
  62   if (! __have_no_stat64)
  63     {
  64       int saved_errno = errno;
  65       result = INLINE_SYSCALL (fstat64, 2, fd, CHECK_1 (buf));
  66
  67       if (result != -1 || errno != ENOSYS)
  68         {
  69 #  if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
  70           if (!result && buf->__st_ino != (__ino_t)buf->st_ino)
  71             buf->st_ino = buf->__st_ino;
  72 #  endif
  73           return result;
  74         }
  75
  76       __set_errno (saved_errno);
  77       __have_no_stat64 = 1;
  78     }
  79 # endif
  80   result = INLINE_SYSCALL (fstat, 2, fd, __ptrvalue (&kbuf));
  81   if (result == 0)
  82     result = xstat64_conv (vers, &kbuf, buf);
  83
  84   return result;
  85 #endif
  86 }
  87
  88 #ifndef RTLD_STAT64
  89 # include <shlib-compat.h>
  90
  91 versioned_symbol (libc, ___fxstat64, __fxstat64, GLIBC_2_2);
  92
  93 # if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
  94 strong_alias (___fxstat64, __old__fxstat64)
  95 compat_symbol (libc, __old__fxstat64, __fxstat64, GLIBC_2_1);
  96 # endif
  97
  98 #else
  99 strong_alias (___fxstat64, __fxstat64);
 100 #endif