Annotation of /trunk/mkinitrd-magellan/busybox/miscutils/mountpoint.c
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Revision 984 -
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Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 1997 byte(s)
Sun May 30 11:32:42 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 1997 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | niro | 532 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | * mountpoint implementation for busybox | ||
4 | * | ||
5 | niro | 816 | * Copyright (C) 2005 Bernhard Reutner-Fischer |
6 | niro | 532 | * |
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 | niro | 816 | #include "libbb.h" |
13 | niro | 532 | |
14 | niro | 816 | int mountpoint_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
15 | niro | 984 | int mountpoint_main(int argc UNUSED_PARAM, char **argv) |
16 | niro | 532 | { |
17 | struct stat st; | ||
18 | niro | 984 | const char *msg; |
19 | niro | 532 | char *arg; |
20 | niro | 984 | int rc, opt; |
21 | |||
22 | opt_complementary = "=1"; /* must have one argument */ | ||
23 | opt = getopt32(argv, "qdxn"); | ||
24 | niro | 532 | #define OPT_q (1) |
25 | #define OPT_d (2) | ||
26 | #define OPT_x (4) | ||
27 | niro | 984 | #define OPT_n (8) |
28 | arg = argv[optind]; | ||
29 | msg = "%s"; | ||
30 | niro | 532 | |
31 | niro | 984 | rc = (opt & OPT_x) ? stat(arg, &st) : lstat(arg, &st); |
32 | if (rc != 0) | ||
33 | goto err; | ||
34 | niro | 532 | |
35 | niro | 984 | 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 | niro | 532 | |
46 | niro | 984 | 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 | niro | 532 | |
52 | niro | 984 | 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 | niro | 532 | } |
69 | niro | 984 | 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 | niro | 532 | } |
73 | niro | 984 | arg = p; |
74 | /* else: stat had set errno, just fall through */ | ||
75 | niro | 532 | } |
76 | niro | 984 | |
77 | err: | ||
78 | niro | 532 | if (!(opt & OPT_q)) |
79 | niro | 984 | bb_perror_msg(msg, arg); |
80 | niro | 532 | return EXIT_FAILURE; |
81 | } |