1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini losetup implementation for busybox
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4 | *
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5 | * Copyright (C) 2002 Matt Kraai.
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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 | #include "libbb.h"
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11 |
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12 | int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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13 | int losetup_main(int argc UNUSED_PARAM, char **argv)
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14 | {
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15 | unsigned opt;
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16 | int n;
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17 | char *opt_o;
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18 | unsigned long long offset = 0;
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19 | enum {
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20 | OPT_d = (1 << 0),
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21 | OPT_o = (1 << 1),
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22 | OPT_f = (1 << 2),
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23 | };
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24 |
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25 | /* max 2 args, all opts are mutually exclusive */
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26 | opt_complementary = "?2:d--of:o--df:f--do";
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27 | opt = getopt32(argv, "do:f", &opt_o);
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28 | argv += optind;
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29 |
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30 | if (opt == OPT_o)
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31 | offset = xatoull(opt_o);
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32 |
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33 | if (opt == OPT_d) {
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34 | /* -d BLOCKDEV */
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35 | if (!argv[0] || argv[1])
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36 | bb_show_usage();
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37 | if (del_loop(argv[0]))
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38 | bb_simple_perror_msg_and_die(argv[0]);
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39 | return EXIT_SUCCESS;
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40 | }
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41 |
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42 | if (argv[0]) {
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43 | char *s;
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44 |
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45 | if (opt == OPT_f) /* -f should not have arguments */
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46 | bb_show_usage();
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47 |
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48 | if (argv[1]) {
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49 | /* [-o OFS] BLOCKDEV FILE */
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50 | if (set_loop(&argv[0], argv[1], offset) < 0)
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51 | bb_simple_perror_msg_and_die(argv[0]);
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52 | return EXIT_SUCCESS;
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53 | }
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54 | /* [-o OFS] BLOCKDEV */
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55 | s = query_loop(argv[0]);
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56 | if (!s)
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57 | bb_simple_perror_msg_and_die(argv[0]);
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58 | printf("%s: %s\n", argv[0], s);
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59 | if (ENABLE_FEATURE_CLEAN_UP)
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60 | free(s);
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61 | return EXIT_SUCCESS;
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62 | }
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63 |
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64 | /* [-o OFS|-f] with no params */
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65 | n = 0;
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66 | while (1) {
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67 | char *s;
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68 | char dev[LOOP_NAMESIZE];
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69 |
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70 | sprintf(dev, LOOP_FORMAT, n);
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71 | s = query_loop(dev);
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72 | n++;
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73 | if (!s) {
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74 | if (n > 9 && errno && errno != ENXIO)
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75 | return EXIT_SUCCESS;
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76 | if (opt == OPT_f) {
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77 | puts(dev);
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78 | return EXIT_SUCCESS;
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79 | }
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80 | } else {
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81 | if (opt != OPT_f)
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82 | printf("%s: %s\n", dev, s);
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83 | if (ENABLE_FEATURE_CLEAN_UP)
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84 | free(s);
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85 | }
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86 | }
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87 | return EXIT_SUCCESS;
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88 | }
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