1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * mountpoint implementation for busybox
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4 | *
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5 | * Copyright (C) 2005 Bernhard Fischer
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6 | *
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7 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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8 | *
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9 | * Based on sysvinit's mountpoint
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10 | */
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11 |
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12 | #include "busybox.h"
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13 | #include <sys/stat.h>
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14 | #include <errno.h> /* errno */
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15 | #include <string.h> /* strerror */
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16 | #include <getopt.h> /* optind */
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17 |
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18 | int mountpoint_main(int argc, char **argv)
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19 | {
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20 | int opt = bb_getopt_ulflags(argc, argv, "qdx");
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21 | #define OPT_q (1)
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22 | #define OPT_d (2)
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23 | #define OPT_x (4)
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24 |
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25 | if (optind != argc - 1)
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26 | bb_show_usage();
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27 | {
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28 | char *arg = argv[optind];
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29 | struct stat st;
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30 |
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31 | if ( (opt & OPT_x && stat(arg, &st) == 0) || (lstat(arg, &st) == 0) ) {
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32 | if (opt & OPT_x) {
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33 | if (S_ISBLK(st.st_mode))
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34 | {
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35 | bb_printf("%u:%u\n", major(st.st_rdev),
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36 | minor(st.st_rdev));
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37 | return EXIT_SUCCESS;
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38 | } else {
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39 | if (opt & OPT_q)
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40 | putchar('\n');
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41 | else
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42 | bb_error_msg("%s: not a block device", arg);
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43 | }
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44 | return EXIT_FAILURE;
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45 | } else
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46 | if (S_ISDIR(st.st_mode)) {
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47 | dev_t st_dev = st.st_dev;
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48 | ino_t st_ino = st.st_ino;
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49 | char *p = bb_xasprintf("%s/..", arg);
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50 |
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51 | if (stat(p, &st) == 0) {
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52 | short ret = (st_dev != st.st_dev) ||
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53 | (st_dev == st.st_dev && st_ino == st.st_ino);
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54 | if (opt & OPT_d)
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55 | bb_printf("%u:%u\n", major(st_dev), minor(st_dev));
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56 | else if (!(opt & OPT_q))
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57 | bb_printf("%s is %sa mountpoint\n", arg, ret?"":"not ");
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58 | return !ret;
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59 | }
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60 | } else {
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61 | if (!(opt & OPT_q))
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62 | bb_error_msg("%s: not a directory", arg);
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63 | return EXIT_FAILURE;
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64 | }
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65 | }
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66 | if (!(opt & OPT_q))
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67 | bb_perror_msg("%s", arg);
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68 | return EXIT_FAILURE;
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69 | }
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70 | }
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