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/* mknod -- make special files
Copyright (C) 1990, 1991 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Usage: mknod [-m mode] [--mode=mode] path {bcu} major minor
make a block or character device node
mknod [-m mode] [--mode=mode] path p
make a FIFO (named pipe)
Options:
-m, --mode=mode Set the mode of created nodes to MODE, which is
symbolic as in chmod and uses the umask as a point of
departure.
David MacKenzie <djm@ai.mit.edu> */
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include "system.h"
#include "modechange.h"
void error ();
static void usage ();
/* The name this program was run with. */
char *program_name;
static struct option const longopts[] =
{
{"mode", required_argument, NULL, 'm'},
{NULL, 0, NULL, 0}
};
void
main (argc, argv)
int argc;
char **argv;
{
unsigned short newmode;
struct mode_change *change;
char *symbolic_mode;
int optc;
program_name = argv[0];
symbolic_mode = NULL;
while ((optc = getopt_long (argc, argv, "m:", longopts, (int *) 0)) != EOF)
{
switch (optc)
{
case 'm':
symbolic_mode = optarg;
break;
default:
usage ();
}
}
newmode = 0666 & ~umask (0);
if (symbolic_mode)
{
change = mode_compile (symbolic_mode, 0);
if (change == MODE_INVALID)
error (1, 0, "invalid mode");
else if (change == MODE_MEMORY_EXHAUSTED)
error (1, 0, "virtual memory exhausted");
newmode = mode_adjust (newmode, change);
}
if (argc - optind != 2 && argc - optind != 4)
usage ();
/* Only check the first character, to allow mnemonic usage like
`mknod /dev/rst0 character 18 0'. */
switch (argv[optind + 1][0])
{
case 'b': /* `block' or `buffered' */
#ifndef S_IFBLK
error (4, 0, "block special files not supported");
#else
if (argc - optind != 4)
usage ();
if (mknod (argv[optind], newmode | S_IFBLK,
makedev (atoi (argv[optind + 2]), atoi (argv[optind + 3]))))
error (1, errno, "%s", argv[optind]);
#endif
break;
case 'c': /* `character' */
case 'u': /* `unbuffered' */
#ifndef S_IFCHR
error (4, 0, "character special files not supported");
#else
if (argc - optind != 4)
usage ();
if (mknod (argv[optind], newmode | S_IFCHR,
makedev (atoi (argv[optind + 2]), atoi (argv[optind + 3]))))
error (1, errno, "%s", argv[optind]);
#endif
break;
case 'p': /* `pipe' */
#ifndef S_ISFIFO
error (4, 0, "fifo files not supported");
#else
if (argc - optind != 2)
usage ();
if (mkfifo (argv[optind], newmode))
error (1, errno, "%s", argv[optind]);
#endif
break;
default:
usage ();
}
exit (0);
}
static void
usage ()
{
fprintf (stderr, "\
Usage: %s [-m mode] [--mode=mode] path {bcu} major minor\n\
%s [-m mode] [--mode=mode] path p\n",
program_name, program_name);
exit (1);
}
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