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mountpoint.c - ubase - suckless linux base utils
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mountpoint.c (1668B)
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1 /* See LICENSE file for copyright and license details. */
2 #include <sys/stat.h>
3 #include <sys/sysmacros.h>
4 #include <sys/types.h>
5
6 #include <mntent.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <unistd.h>
11
12 #include "util.h"
13
14 static void
15 usage(void)
16 {
17 eprintf("usage: %s [-dqx] target\n", argv0);
18 }
19
20 int
21 main(int argc, char *argv[])
22 {
23 int dflag = 0, qflag = 0, xflag = 0;
24 int ret = 0;
25 struct mntent *me = NULL;
26 FILE *fp;
27 struct stat st1, st2;
28
29 ARGBEGIN {
30 case 'd':
31 dflag = 1;
32 break;
33 case 'q':
34 qflag = 1;
35 break;
36 case 'x':
37 xflag = 1;
38 break;
39 default:
40 usage();
41 } ARGEND;
42
43 if (argc < 1)
44 usage();
45
46 if (stat(argv[0], &st1) < 0) {
47 if (qflag)
48 return 1;
49 eprintf("stat %s:", argv[0]);
50 }
51
52 if (xflag) {
53 if (!S_ISBLK(st1.st_mode)) {
54 if (qflag)
55 return 1;
56 eprintf("stat: %s: not a block device\n",
57 argv[0]);
58 }
59 printf("%u:%u\n", major(st1.st_rdev),
60 minor(st1.st_rdev));
61 return 0;
62 }
63
64 if (!S_ISDIR(st1.st_mode)) {
65 if (qflag)
66 return 1;
67 eprintf("stat %s: not a directory\n", argv[0]);
68 }
69
70 if (dflag) {
71 printf("%u:%u\n", major(st1.st_dev),
72 minor(st1.st_dev));
73 return 0;
74 }
75
76 fp = setmntent("/proc/mounts", "r");
77 if (!fp) {
78 if (qflag)
79 return 1;
80 eprintf("setmntent %s:", "/proc/mounts");
81 }
82 while ((me = getmntent(fp)) != NULL) {
83 if (stat(me->mnt_dir, &st2) < 0) {
84 if (qflag)
85 return 1;
86 eprintf("stat %s:", me->mnt_dir);
87 }
88 if (st1.st_dev == st2.st_dev &&
89 st1.st_ino == st2.st_ino)
90 break;
91 }
92 endmntent(fp);
93
94 if (me == NULL)
95 ret = 1;
96
97 if (!qflag)
98 printf("%s %s a mountpoint\n", argv[0],
99 !ret ? "is" : "is not");
100
101 return ret;
102 }
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