Diff of /trunk/mkinitrd-magellan/busybox/miscutils/mountpoint.c

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	revision 983 by niro, Fri Apr 24 18:33:46 2009 UTC	revision 984 by niro, Sun May 30 11:32:42 2010 UTC
#	Line 12	Line 12
12	#include "libbb.h"	#include "libbb.h"
13
14	int mountpoint_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;	int mountpoint_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
15	int mountpoint_main(int argc, char **argv)	int mountpoint_main(int argc UNUSED_PARAM, char **argv)
16	{	{
17	struct stat st;	struct stat st;
18		const char *msg;
19	char *arg;	char *arg;
20	int opt = getopt32(argv, "qdx");	int rc, opt;
21
22		opt_complementary = "=1"; /* must have one argument */
23		opt = getopt32(argv, "qdxn");
24	#define OPT_q (1)	#define OPT_q (1)
25	#define OPT_d (2)	#define OPT_d (2)
26	#define OPT_x (4)	#define OPT_x (4)
27		#define OPT_n (8)
28		arg = argv[optind];
29		msg = "%s";
30
31	if (optind != argc - 1)	rc = (opt & OPT_x) ? stat(arg, &st) : lstat(arg, &st);
32	bb_show_usage();	if (rc != 0)
33		goto err;
34
35	arg = argv[optind];	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	if ( (opt & OPT_x && stat(arg, &st) == 0) || (lstat(arg, &st) == 0) ) {	errno = ENOTDIR;
47	if (opt & OPT_x) {	if (S_ISDIR(st.st_mode)) {
48	if (S_ISBLK(st.st_mode)) {	dev_t st_dev = st.st_dev;
49	printf("%u:%u\n", major(st.st_rdev),	ino_t st_ino = st.st_ino;
50	minor(st.st_rdev));	char *p = xasprintf("%s/..", arg);
51	return EXIT_SUCCESS;
52	} else {	if (stat(p, &st) == 0) {
53	if (opt & OPT_q)	//int is_mnt = (st_dev != st.st_dev) || (st_dev == st.st_dev && st_ino == st.st_ino);
54	bb_putchar('\n');	int is_not_mnt = (st_dev == st.st_dev) && (st_ino != st.st_ino);
55	else
56	bb_error_msg("%s: not a block device", arg);	if (opt & OPT_d)
57	}	printf("%u:%u\n", major(st_dev), minor(st_dev));
58	return EXIT_FAILURE;	if (opt & OPT_n) {
59	} else	const char *d = find_block_device(arg);
60	if (S_ISDIR(st.st_mode)) {	/* name is undefined, but device is mounted -> anonymous superblock! */
61	dev_t st_dev = st.st_dev;	/* happens with btrfs */
62	ino_t st_ino = st.st_ino;	if (!d) {
63	char *p = xasprintf("%s/..", arg);	d = "UNKNOWN";
64		/* TODO: iterate /proc/mounts, or /proc/self/mountinfo
65	if (stat(p, &st) == 0) {	* to find out the device name */
66	int ret = (st_dev != st.st_dev) ||	}
67	(st_dev == st.st_dev && st_ino == st.st_ino);	printf("%s %s\n", d, arg);
	if (opt & OPT_d)
	printf("%u:%u\n", major(st_dev), minor(st_dev));
	else if (!(opt & OPT_q))
	printf("%s is %sa mountpoint\n", arg, ret?"":"not ");
	return !ret;
68	}	}
69	} else {	if (!(opt & (OPT_q | OPT_d | OPT_n)))
70	if (!(opt & OPT_q))	printf("%s is %sa mountpoint\n", arg, is_not_mnt ? "not " : "");
71	bb_error_msg("%s: not a directory", arg);	return is_not_mnt;
	return EXIT_FAILURE;
72	}	}
73		arg = p;
74		/* else: stat had set errno, just fall through */
75	}	}
76
77		err:
78	if (!(opt & OPT_q))	if (!(opt & OPT_q))
79	bb_simple_perror_msg(arg);	bb_perror_msg(msg, arg);
80	return EXIT_FAILURE;	return EXIT_FAILURE;
81	}	}

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Legend: Removed from v.983   changed lines   Added in v.984