LXR busybox/coreutils/mknod.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * mknod implementation for busybox
   4 *
   5 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
   6 *
   7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8 */
   9
  10/* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
  11
  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)"
  17//usage:        IF_SELINUX(
  18//usage:     "\n        -Z      Set security context"
  19//usage:        )
  20//usage:     "\nTYPE:"
  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)"
  24//usage:
  25//usage:#define mknod_example_usage
  26//usage:       "$ mknod /dev/fd0 b 2 0\n"
  27//usage:       "$ mknod -m 644 /tmp/pipe p\n"
  28
  29#include <sys/sysmacros.h>  // For makedev
  30
  31#include "libbb.h"
  32#include "libcoreutils/coreutils.h"
  33
  34/* This is a NOEXEC applet. Be very careful! */
  35
  36static const char modes_chars[] ALIGN1 = { 'p', 'c', 'u', 'b', 0, 1, 1, 2 };
  37static const mode_t modes_cubp[] = { S_IFIFO, S_IFCHR, S_IFBLK };
  38
  39int mknod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  40int mknod_main(int argc, char **argv)
  41{
  42        mode_t mode;
  43        dev_t dev;
  44        const char *name;
  45
  46        mode = getopt_mk_fifo_nod(argv);
  47        argv += optind;
  48        argc -= optind;
  49
  50        if (argc >= 2) {
  51                name = strchr(modes_chars, argv[1][0]);
  52                if (name != NULL) {
  53                        mode |= modes_cubp[(int)(name[4])];
  54
  55                        dev = 0;
  56                        if (*name != 'p') {
  57                                argc -= 2;
  58                                if (argc == 2) {
  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)));
  63                                }
  64                        }
  65
  66                        if (argc == 2) {
  67                                name = *argv;
  68                                if (mknod(name, mode, dev) == 0) {
  69                                        return EXIT_SUCCESS;
  70                                }
  71                                bb_simple_perror_msg_and_die(name);
  72                        }
  73                }
  74        }
  75        bb_show_usage();
  76}
  77