MiNTlib: support for MFS_MKNOD

[Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>]

This patch add support for MFS_MKNOD to mknod.  This is mainly useful
for unpacking the Linux root filesystem under MiNT, with its device
files under /dev.

Thanks to Stephen for adding MFS_MKNOD to MinixFS.

*** orig/mknod.c	Tue Oct 12 20:05:16 1993
--- mknod.c	Sat May 21 23:41:02 1994
***************
*** 1,20 ****
! /* fake mknod -- this always fails */
  
  #include <errno.h>
  #include <support.h>
  #include <stat.h>
  
  int
  mknod(path, mode, dev)
! 	char *path;
  	int mode, dev;
  {
  	if (S_ISDIR(mode)) {
  		return (mkdir(path, (mode_t) mode));
  	}
! 	if (S_ISFIFO(mode)) {
! 		return (mkfifo(path, (mode_t) mode));
! 	}	
! 	errno = EINVAL;
! 	return -1;
  }
--- 1,34 ----
! /* fake mknod -- this always fails, except with MinixFS 0.06pl10 or later */
  
  #include <errno.h>
  #include <support.h>
  #include <stat.h>
+ #include <limits.h>
+ #include <types.h>
+ #include <mintbind.h>
+ #include <errno.h>
+ #include "lib.h"
+ 
+ #define MFS_MKNOD 0x10f
  
  int
  mknod(path, mode, dev)
! 	const char *path;
  	int mode, dev;
  {
+ 	long err, magic;
+ 	char _path[PATH_MAX];
+ 
  	if (S_ISDIR(mode)) {
  		return (mkdir(path, (mode_t) mode));
  	}
! 	_unx2dos (path, _path);
! 	err = Dcntl (MFS_MKNOD, _path,
! 		     ((long) mode & 0xffff) | ((long) dev << 16));
! 	if (err < 0)
! 	  {
! 	    errno = -err;
! 	    return -1;
! 	  }
! 	return 0;
  }