release/src/router/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
  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 };
  38
  39 int mknod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  40 int 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 }