87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* mknod implementation for busybox
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*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config MKNOD
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//config: bool "mknod (4.5 kb)"
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//config: default y
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//config: help
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//config: mknod is used to create FIFOs or block/character special
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//config: files with the specified names.
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//applet:IF_MKNOD(APPLET_NOEXEC(mknod, mknod, BB_DIR_BIN, BB_SUID_DROP, mknod))
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//kbuild:lib-$(CONFIG_MKNOD) += mknod.o
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/* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
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//usage:#define mknod_trivial_usage
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//usage: "[-m MODE] " IF_SELINUX("[-Z] ") "NAME TYPE [MAJOR MINOR]"
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//usage:#define mknod_full_usage "\n\n"
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//usage: "Create a special file (block, character, or pipe)\n"
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//usage: "\n -m MODE Creation mode (default a=rw)"
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//usage: IF_SELINUX(
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//usage: "\n -Z Set security context"
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//usage: )
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//usage: "\nTYPE:"
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//usage: "\n b Block device"
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//usage: "\n c or u Character device"
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//usage: "\n p Named pipe (MAJOR MINOR must be omitted)"
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//usage:
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//usage:#define mknod_example_usage
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//usage: "$ mknod /dev/fd0 b 2 0\n"
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//usage: "$ mknod -m 644 /tmp/pipe p\n"
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#include <sys/sysmacros.h> // For makedev
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#include "libbb.h"
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#include "libcoreutils/coreutils.h"
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/* This is a NOEXEC applet. Be very careful! */
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static const char modes_chars[] ALIGN1 = { 'p', 'c', 'u', 'b', 0, 1, 1, 2 };
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static const mode_t modes_cubp[] = { S_IFIFO, S_IFCHR, S_IFBLK };
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int mknod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int mknod_main(int argc UNUSED_PARAM, char **argv)
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{
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mode_t mode;
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dev_t dev;
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const char *type, *arg;
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mode = getopt_mk_fifo_nod(argv);
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argv += optind;
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//argc -= optind;
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if (!argv[0] || !argv[1])
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bb_show_usage();
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type = strchr(modes_chars, argv[1][0]);
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if (!type)
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bb_show_usage();
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mode |= modes_cubp[(int)(type[4])];
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dev = 0;
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arg = argv[2];
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if (*type != 'p') {
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if (!argv[2] || !argv[3])
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bb_show_usage();
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/* Autodetect what the system supports; these macros should
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* optimize out to two constants. */
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dev = makedev(xatoul_range(argv[2], 0, major(UINT_MAX)),
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xatoul_range(argv[3], 0, minor(UINT_MAX)));
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arg = argv[4];
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}
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if (arg)
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bb_show_usage();
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if (mknod(argv[0], mode, dev) != 0) {
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bb_simple_perror_msg_and_die(argv[0]);
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}
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return EXIT_SUCCESS;
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}
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