Attachment 989 Details for Bug 7369 – devmap_name.c

devmap_name.c

devmap_name.c (text/plain), 1.63 KB, created by Nick S. Grechukh on 2005-07-15 02:52:30 MSD

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Creator: Nick S. Grechukh

Created: 2005-07-15 02:52:30 MSD

Size: 1.63 KB

patch

obsolete

>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>#include <ctype.h>
>#include <unistd.h>
>#include <linux/kdev_t.h>
>#include <libdevmapper.h>
>
>static void usage(char * progname) {
>	fprintf(stderr, "usage : %s [-t target type] dev_t\n", progname);
>	fprintf(stderr, "where dev_t is either 'major minor' or 'major:minor'\n");
>	exit(1);
>}
>
>int dm_target_type(int major, int minor, char *type)
>{
>	struct dm_task *dmt;
>	void *next = NULL;
>	uint64_t start, length;
>	char *target_type = NULL;
>	char *params;
>	int r = 1;
>
>	if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
>		return 1;
>
>	if (!dm_task_set_major(dmt, major) ||
>	    !dm_task_set_minor(dmt, minor))
>		goto bad;
>
>	dm_task_no_open_count(dmt);
>
>	if (!dm_task_run(dmt))
>		goto bad;
>
>	if (!type)
>		goto good;
>
>	do {
>		next = dm_get_next_target(dmt, next, &start, &length,
>					  &target_type, &params);
>		if (target_type && strcmp(target_type, type))
>			goto bad;
>	} while (next);
>
>good:
>	printf("%s\n", dm_task_get_name(dmt));
>	r = 0;
>bad:
>	dm_task_destroy(dmt);
>	return r;
>}
>
>int main(int argc, char **argv)
>{
>	int c;
>	int major, minor;
>	char *target_type = NULL;
>
>	while ((c = getopt(argc, argv, "t:")) != -1) {
>		switch (c) {
>		case 't':
>			target_type = optarg;
>			break;
>		default:
>			usage(argv[0]);
>			return 1;
>			break;
>		}
>	}
>
>	/* sanity check */
>	if (optind == argc - 2) {
>		major = atoi(argv[argc - 2]);
>		minor = atoi(argv[argc - 1]);
>	} else if (optind != argc - 1 ||
>		   2 != sscanf(argv[argc - 1], "%i:%i", &major, &minor))
>		usage(argv[0]);
>
>	if (dm_target_type(major, minor, target_type))
>		return 1;
>                                                                                
>	return 0;
>}
>

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