sysdeps/unix/sysv/linux/xmknod.c

   1 /* xmknod call using old-style Unix mknod system call.
   2    Copyright (C) 1991,93,95,96,97,98,2000,2002 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 <sys/types.h>
  22 #include <sys/stat.h>
  23 #include <sys/sysmacros.h>
  24
  25 #include <sysdep.h>
  26 #include <sys/syscall.h>
  27 #include <bp-checks.h>
  28
  29 extern int __syscall_mknod (const char *__unbounded, unsigned short int,
  30                             unsigned short int);
  31
  32 /* Create a device file named PATH, with permission and special bits MODE
  33    and device number DEV (which can be constructed from major and minor
  34    device numbers with the `makedev' macro above).  */
  35 int
  36 __xmknod (int vers, const char *path, mode_t mode, dev_t *dev)
  37 {
  38   unsigned short int k_dev;
  39
  40   if (vers != _MKNOD_VER)
  41     {
  42       __set_errno (EINVAL);
  43       return -1;
  44     }
  45
  46   /* We must convert the value to dev_t type used by the kernel.  */
  47   k_dev = ((major (*dev) & 0xff) << 8) | (minor (*dev) & 0xff);
  48
  49   return INLINE_SYSCALL (mknod, 3, CHECK_STRING (path), mode, k_dev);
  50 }
  51
  52 weak_alias (__xmknod, _xmknod)
  53 libc_hidden_def (__xmknod)