sysdeps/unix/sysv/linux/fxstat.c

   1 /* fxstat using old-style Unix fstat system call.
   2    Copyright (C) 1991-2014 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 /* Ho hum, if xstat == xstat64 we must get rid of the prototype or gcc
  20    will complain since they don't strictly match.  */
  21 #define __fxstat64 __fxstat64_disable
  22
  23 #include <errno.h>
  24 #include <stddef.h>
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <kernel_stat.h>
  28
  29 #include <sysdep.h>
  30 #include <sys/syscall.h>
  31
  32 #include <xstatconv.h>
  33
  34 /* Get information about the file FD in BUF.  */
  35 int
  36 __fxstat (int vers, int fd, struct stat *buf)
  37 {
  38   if (vers == _STAT_VER_KERNEL)
  39     return INLINE_SYSCALL (fstat, 2, fd, (struct kernel_stat *) buf);
  40
  41 #ifdef STAT_IS_KERNEL_STAT
  42   errno = EINVAL;
  43   return -1;
  44 #else
  45   struct kernel_stat kbuf;
  46   int result;
  47
  48   result = INLINE_SYSCALL (fstat, 2, fd, &kbuf);
  49   if (result == 0)
  50     result = __xstat_conv (vers, &kbuf, buf);
  51
  52   return result;
  53 #endif
  54 }
  55
  56 hidden_def (__fxstat)
  57 weak_alias (__fxstat, _fxstat);
  58 #ifdef XSTAT_IS_XSTAT64
  59 #undef __fxstat64
  60 strong_alias (__fxstat, __fxstat64);
  61 hidden_ver (__fxstat, __fxstat64)
  62 #endif