1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * mknod implementation for busybox
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4 | *
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5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
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11 |
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12 | //usage:#define mknod_trivial_usage
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13 | //usage: "[-m MODE] " IF_SELINUX("[-Z] ") "NAME TYPE MAJOR MINOR"
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14 | //usage:#define mknod_full_usage "\n\n"
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15 | //usage: "Create a special file (block, character, or pipe)\n"
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16 | //usage: "\n -m MODE Creation mode (default a=rw)"
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17 | //usage: IF_SELINUX(
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18 | //usage: "\n -Z Set security context"
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19 | //usage: )
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20 | //usage: "\nTYPE:"
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21 | //usage: "\n b Block device"
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22 | //usage: "\n c or u Character device"
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23 | //usage: "\n p Named pipe (MAJOR and MINOR are ignored)"
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24 | //usage:
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25 | //usage:#define mknod_example_usage
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26 | //usage: "$ mknod /dev/fd0 b 2 0\n"
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27 | //usage: "$ mknod -m 644 /tmp/pipe p\n"
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28 |
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29 | #include <sys/sysmacros.h> // For makedev
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30 |
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31 | #include "libbb.h"
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32 | #include "libcoreutils/coreutils.h"
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33 |
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34 | /* This is a NOEXEC applet. Be very careful! */
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35 |
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36 | static const char modes_chars[] ALIGN1 = { 'p', 'c', 'u', 'b', 0, 1, 1, 2 };
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37 | static const mode_t modes_cubp[] = { S_IFIFO, S_IFCHR, S_IFBLK };
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38 |
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39 | int mknod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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40 | int mknod_main(int argc, char **argv)
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41 | {
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42 | mode_t mode;
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43 | dev_t dev;
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44 | const char *name;
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45 |
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46 | mode = getopt_mk_fifo_nod(argv);
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47 | argv += optind;
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48 | argc -= optind;
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49 |
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50 | if (argc >= 2) {
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51 | name = strchr(modes_chars, argv[1][0]);
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52 | if (name != NULL) {
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53 | mode |= modes_cubp[(int)(name[4])];
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54 |
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55 | dev = 0;
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56 | if (*name != 'p') {
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57 | argc -= 2;
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58 | if (argc == 2) {
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59 | /* Autodetect what the system supports; these macros should
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60 | * optimize out to two constants. */
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61 | dev = makedev(xatoul_range(argv[2], 0, major(UINT_MAX)),
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62 | xatoul_range(argv[3], 0, minor(UINT_MAX)));
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63 | }
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64 | }
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65 |
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66 | if (argc == 2) {
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67 | name = *argv;
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68 | if (mknod(name, mode, dev) == 0) {
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69 | return EXIT_SUCCESS;
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70 | }
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71 | bb_simple_perror_msg_and_die(name);
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72 | }
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73 | }
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74 | }
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75 | bb_show_usage();
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76 | }
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