Contents of /tags/mkinitrd-6_1_12/busybox/miscutils/mountpoint.c
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Revision 939 -
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Tue Nov 17 21:24:51 2009 UTC (14 years, 6 months ago) by niro
File MIME type: text/plain
File size: 1543 byte(s)
Tue Nov 17 21:24:51 2009 UTC (14 years, 6 months ago) by niro
File MIME type: text/plain
File size: 1543 byte(s)
tagged 'mkinitrd-6_1_12'
| 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * mountpoint implementation for busybox |
| 4 | * |
| 5 | * Copyright (C) 2005 Bernhard Reutner-Fischer |
| 6 | * |
| 7 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
| 8 | * |
| 9 | * Based on sysvinit's mountpoint |
| 10 | */ |
| 11 | |
| 12 | #include "libbb.h" |
| 13 | |
| 14 | int mountpoint_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 15 | int mountpoint_main(int argc, char **argv) |
| 16 | { |
| 17 | struct stat st; |
| 18 | char *arg; |
| 19 | int opt = getopt32(argv, "qdx"); |
| 20 | #define OPT_q (1) |
| 21 | #define OPT_d (2) |
| 22 | #define OPT_x (4) |
| 23 | |
| 24 | if (optind != argc - 1) |
| 25 | bb_show_usage(); |
| 26 | |
| 27 | arg = argv[optind]; |
| 28 | |
| 29 | if ( (opt & OPT_x && stat(arg, &st) == 0) || (lstat(arg, &st) == 0) ) { |
| 30 | if (opt & OPT_x) { |
| 31 | if (S_ISBLK(st.st_mode)) { |
| 32 | printf("%u:%u\n", major(st.st_rdev), |
| 33 | minor(st.st_rdev)); |
| 34 | return EXIT_SUCCESS; |
| 35 | } else { |
| 36 | if (opt & OPT_q) |
| 37 | bb_putchar('\n'); |
| 38 | else |
| 39 | bb_error_msg("%s: not a block device", arg); |
| 40 | } |
| 41 | return EXIT_FAILURE; |
| 42 | } else |
| 43 | if (S_ISDIR(st.st_mode)) { |
| 44 | dev_t st_dev = st.st_dev; |
| 45 | ino_t st_ino = st.st_ino; |
| 46 | char *p = xasprintf("%s/..", arg); |
| 47 | |
| 48 | if (stat(p, &st) == 0) { |
| 49 | int ret = (st_dev != st.st_dev) || |
| 50 | (st_dev == st.st_dev && st_ino == st.st_ino); |
| 51 | if (opt & OPT_d) |
| 52 | printf("%u:%u\n", major(st_dev), minor(st_dev)); |
| 53 | else if (!(opt & OPT_q)) |
| 54 | printf("%s is %sa mountpoint\n", arg, ret?"":"not "); |
| 55 | return !ret; |
| 56 | } |
| 57 | } else { |
| 58 | if (!(opt & OPT_q)) |
| 59 | bb_error_msg("%s: not a directory", arg); |
| 60 | return EXIT_FAILURE; |
| 61 | } |
| 62 | } |
| 63 | if (!(opt & OPT_q)) |
| 64 | bb_simple_perror_msg(arg); |
| 65 | return EXIT_FAILURE; |
| 66 | } |