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1 | /* | |
2 | * mountpoint See if a directory is a mountpoint. | |
3 | * | |
4 | * Author: Miquel van Smoorenburg. | |
5 | * | |
6 | * Version: @(#)mountpoint 2.85-12 17-Mar-2004 miquels@cistron.nl | |
7 | * | |
8 | * This file is part of the sysvinit suite, | |
9 | * Copyright (C) 1991-2004 Miquel van Smoorenburg. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
24 | */ | |
25 | ||
26 | #include <sys/stat.h> | |
27 | #include <unistd.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
30 | #include <errno.h> | |
31 | #include <stdarg.h> | |
32 | #include <getopt.h> | |
33 | #include <stdio.h> | |
34 | ||
35 | int dostat(char *path, struct stat *st, int do_lstat, int quiet) | |
36 | { | |
37 | int n; | |
38 | ||
39 | if (do_lstat) | |
40 | n = lstat(path, st); | |
41 | else | |
42 | n = stat(path, st); | |
43 | ||
44 | if (n != 0) { | |
45 | if (!quiet) | |
46 | fprintf(stderr, "mountpoint: %s: %s\n", path, | |
47 | strerror(errno)); | |
48 | return -1; | |
49 | } | |
50 | return 0; | |
51 | } | |
52 | ||
53 | void usage(void) { | |
54 | fprintf(stderr, "Usage: mountpoint [-q] [-d] [-x] path\n"); | |
55 | exit(1); | |
56 | } | |
57 | ||
58 | int main(int argc, char **argv) | |
59 | { | |
60 | struct stat st, st2; | |
61 | char buf[256]; | |
62 | char *path; | |
63 | int quiet = 0; | |
64 | int showdev = 0; | |
65 | int xdev = 0; | |
66 | int c, r; | |
67 | ||
68 | while ((c = getopt(argc, argv, "dqx")) != EOF) switch(c) { | |
69 | case 'd': | |
70 | showdev = 1; | |
71 | break; | |
72 | case 'q': | |
73 | quiet = 1; | |
74 | break; | |
75 | case 'x': | |
76 | xdev = 1; | |
77 | break; | |
78 | default: | |
79 | usage(); | |
80 | break; | |
81 | } | |
82 | if (optind != argc - 1) usage(); | |
83 | path = argv[optind]; | |
84 | ||
85 | if (dostat(path, &st, !xdev, quiet) < 0) | |
86 | return 1; | |
87 | ||
88 | if (xdev) { | |
89 | #ifdef __linux__ | |
90 | if (!S_ISBLK(st.st_mode)) | |
91 | #else | |
92 | if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) | |
93 | #endif | |
94 | { | |
95 | if (quiet) | |
96 | printf("\n"); | |
97 | else | |
98 | fprintf(stderr, "mountpoint: %s: not a block device\n", | |
99 | path); | |
100 | return 1; | |
101 | } | |
102 | printf("%u:%u\n", major(st.st_rdev), minor(st.st_rdev)); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | if (!S_ISDIR(st.st_mode)) { | |
107 | if (!quiet) | |
108 | fprintf(stderr, "mountpoint: %s: not a directory\n", | |
109 | path); | |
110 | return 1; | |
111 | } | |
112 | ||
113 | memset(buf, 0, sizeof(buf)); | |
114 | strncpy(buf, path, sizeof(buf) - 4); | |
115 | strcat(buf, "/.."); | |
116 | if (dostat(buf, &st2, 0, quiet) < 0) | |
117 | return 1; | |
118 | ||
119 | r = (st.st_dev != st2.st_dev) || | |
120 | (st.st_dev == st2.st_dev && st.st_ino == st2.st_ino); | |
121 | ||
122 | if (!quiet && !showdev) | |
123 | printf("%s is %sa mountpoint\n", path, r ? "" : "not "); | |
124 | if (showdev) | |
125 | printf("%u:%u\n", major(st.st_dev), minor(st.st_dev)); | |
126 | ||
127 | return r ? 0 : 1; | |
128 | } |