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/* mknod -- make special files
Copyright (C) 90, 91, 1995-2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 <config.h>
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include "system.h"
#include "error.h"
#include "modechange.h"
#include "quote.h"
#include "xstrtol.h"
/* The official name of this program (e.g., no `g' prefix). */
#define PROGRAM_NAME "mknod"
#define AUTHORS "David MacKenzie"
/* The name this program was run with. */
char *program_name;
static struct option const longopts[] =
{
{"mode", required_argument, NULL, 'm'},
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{NULL, 0, NULL, 0}
};
void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("Usage: %s [OPTION]... NAME TYPE [MAJOR MINOR]\n"), program_name);
fputs (_("\
Create the special file NAME of the given TYPE.\n\
\n\
"), stdout);
fputs (_("\
Mandatory arguments to long options are mandatory for short options too.\n\
"), stdout);
fputs (_("\
-m, --mode=MODE set permission mode (as in chmod), not a=rw - umask\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
fputs (_("\
\n\
MAJOR MINOR are forbidden for TYPE p, mandatory otherwise. TYPE may be:\n\
\n\
b create a block (buffered) special file\n\
c, u create a character (unbuffered) special file\n\
p create a FIFO\n\
"), stdout);
printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
}
exit (status);
}
int
main (int argc, char **argv)
{
mode_t newmode;
struct mode_change *change;
const char *specified_mode;
int optc;
mode_t node_type;
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
specified_mode = NULL;
while ((optc = getopt_long (argc, argv, "m:", longopts, NULL)) != -1)
{
switch (optc)
{
case 0:
break;
case 'm':
specified_mode = optarg;
break;
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (1);
}
}
newmode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
if (specified_mode)
{
newmode &= ~ umask (0);
change = mode_compile (specified_mode, 0);
if (change == MODE_INVALID)
error (EXIT_FAILURE, 0, _("invalid mode"));
else if (change == MODE_MEMORY_EXHAUSTED)
xalloc_die ();
newmode = mode_adjust (newmode, change);
}
if (argc - optind != 2 && argc - optind != 4)
{
const char *msg;
if (argc - optind < 2)
msg = _("too few arguments");
else if (argc - optind > 4)
msg = _("too many arguments");
else
msg = _("wrong number of arguments");
error (0, 0, "%s", msg);
usage (1);
}
/* 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
node_type = S_IFBLK;
#endif
goto block_or_character;
case 'c': /* `character' */
case 'u': /* `unbuffered' */
#ifndef S_IFCHR
error (4, 0, _("character special files not supported"));
#else
node_type = S_IFCHR;
#endif
goto block_or_character;
block_or_character:
if (argc - optind != 4)
{
error (0, 0, _("\
when creating special files, major and minor device\n\
numbers must be specified"));
usage (1);
}
{
char const *s_major = argv[optind + 2];
char const *s_minor = argv[optind + 3];
uintmax_t i_major, i_minor;
dev_t device;
if (xstrtoumax (s_major, NULL, 0, &i_major, NULL) != LONGINT_OK
|| i_major != (major_t) i_major)
error (EXIT_FAILURE, 0,
_("invalid major device number %s"), quote (s_major));
if (xstrtoumax (s_minor, NULL, 0, &i_minor, NULL) != LONGINT_OK
|| i_minor != (minor_t) i_minor)
error (EXIT_FAILURE, 0,
_("invalid minor device number %s"), quote (s_minor));
device = makedev (i_major, i_minor);
#ifdef NODEV
if (device == NODEV)
error (EXIT_FAILURE, 0, _("invalid device %s %s"), s_major, s_minor);
#endif
if (mknod (argv[optind], newmode | node_type, device) != 0)
error (EXIT_FAILURE, errno, "%s", quote (argv[optind]));
}
break;
case 'p': /* `pipe' */
#ifndef S_ISFIFO
error (4, 0, _("fifo files not supported"));
#else
if (argc - optind != 2)
{
error (0, 0, _("\
major and minor device numbers may not be specified for fifo files"));
usage (1);
}
if (mkfifo (argv[optind], newmode))
error (EXIT_FAILURE, errno, "%s", quote (argv[optind]));
#endif
break;
default:
error (0, 0, "invalid device type %s", quote (argv[optind + 1]));
usage (1);
}
/* Perform an explicit chmod to ensure the file mode permission bits
are set as specified. This extra step is necessary in some cases
when the containing directory has a default ACL. */
if (specified_mode)
{
if (chmod (argv[optind], newmode))
error (0, errno, _("cannot set permissions of %s"),
quote (argv[optind]));
}
exit (0);
}
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