sysdeps/unix/sysv/linux/xmknod.c

   1 /* xmknod call using old-style Unix mknod system call.
   2    Copyright (C) 1991, 1993, 1995, 1996, 1997, 1998, 2000, 2002, 2003
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <sys/sysmacros.h>
  25
  26 #include <sysdep.h>
  27 #include <sys/syscall.h>
  28 #include <bp-checks.h>
  29
  30 /* Create a device file named PATH, with permission and special bits MODE
  31    and device number DEV (which can be constructed from major and minor
  32    device numbers with the `makedev' macro above).  */
  33 int
  34 __xmknod (int vers, const char *path, mode_t mode, dev_t *dev)
  35 {
  36   unsigned long long int k_dev;
  37
  38   if (vers != _MKNOD_VER)
  39     {
  40       __set_errno (EINVAL);
  41       return -1;
  42     }
  43
  44   /* We must convert the value to dev_t type used by the kernel.  */
  45   k_dev =  (*dev) & ((1ULL << 32) - 1);
  46   if (k_dev != *dev)
  47     {
  48       __set_errno (EINVAL);
  49       return -1;
  50     }
  51
  52   return INLINE_SYSCALL (mknod, 3, CHECK_STRING (path), mode,
  53                          (unsigned int) k_dev);
  54 }
  55
  56 weak_alias (__xmknod, _xmknod)
  57 libc_hidden_def (__xmknod)