| 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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