1 /* vi: set sw=4 ts=4: */
3 * mknod implementation for busybox
5 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
12 //usage:#define mknod_trivial_usage
13 //usage: "[-m MODE] " IF_SELINUX("[-Z] ") "NAME TYPE MAJOR MINOR"
14 //usage:#define mknod_full_usage "\n\n"
15 //usage: "Create a special file (block, character, or pipe)\n"
16 //usage: "\n -m MODE Creation mode (default a=rw)"
18 //usage: "\n -Z Set security context"
21 //usage: "\n b Block device"
22 //usage: "\n c or u Character device"
23 //usage: "\n p Named pipe (MAJOR and MINOR are ignored)"
25 //usage:#define mknod_example_usage
26 //usage: "$ mknod /dev/fd0 b 2 0\n"
27 //usage: "$ mknod -m 644 /tmp/pipe p\n"
29 #include <sys/sysmacros.h> // For makedev
32 #include "libcoreutils/coreutils.h"
34 /* This is a NOEXEC applet. Be very careful! */
36 static const char modes_chars[] ALIGN1 = { 'p', 'c', 'u', 'b', 0, 1, 1, 2 };
37 static const mode_t modes_cubp[] = { S_IFIFO, S_IFCHR, S_IFBLK };
39 int mknod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
40 int mknod_main(int argc, char **argv)
46 mode = getopt_mk_fifo_nod(argv);
51 name = strchr(modes_chars, argv[1][0]);
53 mode |= modes_cubp[(int)(name[4])];
59 /* Autodetect what the system supports; these macros should
60 * optimize out to two constants. */
61 dev = makedev(xatoul_range(argv[2], 0, major(UINT_MAX)),
62 xatoul_range(argv[3], 0, minor(UINT_MAX)));
68 if (mknod(name, mode, dev) == 0) {
71 bb_simple_perror_msg_and_die(name);