sysdeps/unix/sysv/linux/ustat.c

   1 /* Copyright (C) 1997-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   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 <sys/ustat.h>
  21 #include <sys/sysmacros.h>
  22
  23 #include <sysdep.h>
  24 #include <sys/syscall.h>
  25
  26 int
  27 ustat (dev_t dev, struct ustat *ubuf)
  28 {
  29   unsigned long long int k_dev;
  30
  31   /* We must convert the value to dev_t type used by the kernel.  */
  32   k_dev =  dev & ((1ULL << 32) - 1);
  33   if (k_dev != dev)
  34     return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
  35
  36   return INLINE_SYSCALL (ustat, 2, (unsigned int) k_dev, ubuf);
  37 }