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