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 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 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
  28 extern int __syscall_mknod (const char *, unsigned short int,
  29                             unsigned short int);
  30
  31 /* Create a device file named PATH, with permission and special bits MODE
  32    and device number DEV (which can be constructed from major and minor
  33    device numbers with the `makedev' macro above).  */
  34 int
  35 __xmknod (int vers, const char *path, mode_t mode, dev_t *dev)
  36 {
  37   unsigned short int k_dev;
  38
  39   if (vers != _MKNOD_VER)
  40     {
  41       __set_errno (EINVAL);
  42       return -1;
  43     }
  44
  45   /* We must convert the value to dev_t type used by the kernel.  */
  46   k_dev = ((major (*dev) & 0xff) << 8) | (minor (*dev) & 0xff);
  47
  48   return INLINE_SYSCALL (mknod, 3, path, mode, k_dev);
  49 }
  50
  51 weak_alias (__xmknod, _xmknod)