Contents of /tags/mkinitrd-6_3_0/busybox/miscutils/mountpoint.c
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Thu Aug 19 10:14:02 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 1997 byte(s)
Thu Aug 19 10:14:02 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 1997 byte(s)
tagged 'mkinitrd-6_3_0'
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 UNUSED_PARAM, char **argv) |
16 | { |
17 | struct stat st; |
18 | const char *msg; |
19 | char *arg; |
20 | int rc, opt; |
21 | |
22 | opt_complementary = "=1"; /* must have one argument */ |
23 | opt = getopt32(argv, "qdxn"); |
24 | #define OPT_q (1) |
25 | #define OPT_d (2) |
26 | #define OPT_x (4) |
27 | #define OPT_n (8) |
28 | arg = argv[optind]; |
29 | msg = "%s"; |
30 | |
31 | rc = (opt & OPT_x) ? stat(arg, &st) : lstat(arg, &st); |
32 | if (rc != 0) |
33 | goto err; |
34 | |
35 | if (opt & OPT_x) { |
36 | if (S_ISBLK(st.st_mode)) { |
37 | printf("%u:%u\n", major(st.st_rdev), |
38 | minor(st.st_rdev)); |
39 | return EXIT_SUCCESS; |
40 | } |
41 | errno = 0; /* make perror_msg work as error_msg */ |
42 | msg = "%s: not a block device"; |
43 | goto err; |
44 | } |
45 | |
46 | errno = ENOTDIR; |
47 | if (S_ISDIR(st.st_mode)) { |
48 | dev_t st_dev = st.st_dev; |
49 | ino_t st_ino = st.st_ino; |
50 | char *p = xasprintf("%s/..", arg); |
51 | |
52 | if (stat(p, &st) == 0) { |
53 | //int is_mnt = (st_dev != st.st_dev) || (st_dev == st.st_dev && st_ino == st.st_ino); |
54 | int is_not_mnt = (st_dev == st.st_dev) && (st_ino != st.st_ino); |
55 | |
56 | if (opt & OPT_d) |
57 | printf("%u:%u\n", major(st_dev), minor(st_dev)); |
58 | if (opt & OPT_n) { |
59 | const char *d = find_block_device(arg); |
60 | /* name is undefined, but device is mounted -> anonymous superblock! */ |
61 | /* happens with btrfs */ |
62 | if (!d) { |
63 | d = "UNKNOWN"; |
64 | /* TODO: iterate /proc/mounts, or /proc/self/mountinfo |
65 | * to find out the device name */ |
66 | } |
67 | printf("%s %s\n", d, arg); |
68 | } |
69 | if (!(opt & (OPT_q | OPT_d | OPT_n))) |
70 | printf("%s is %sa mountpoint\n", arg, is_not_mnt ? "not " : ""); |
71 | return is_not_mnt; |
72 | } |
73 | arg = p; |
74 | /* else: stat had set errno, just fall through */ |
75 | } |
76 | |
77 | err: |
78 | if (!(opt & OPT_q)) |
79 | bb_perror_msg(msg, arg); |
80 | return EXIT_FAILURE; |
81 | } |