1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*
13 * Copyright 2019 Joyent, Inc.
14 */
15
16 #include <sys/types.h>
17 #include <sys/stat.h>
18 #include <fcntl.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <errno.h>
22 #include <string.h>
23 #include <unistd.h>
24 #include <sys/dkio.h>
25
26 int
main(int argc,char ** argv)27 main(int argc, char **argv)
28 {
29 int umap, fd;
30
31 if (argc < 2) {
32 fprintf(stderr, "missing disk name\n");
33 exit(2);
34 }
35
36 if ((fd = open(argv[1], O_RDONLY)) == -1) {
37 fprintf(stderr, "couldn't open %s: %s\n", argv[1],
38 strerror(errno));
39 exit(2);
40 }
41
42 if (ioctl(fd, DKIOC_CANFREE, &umap) < 0) {
43 fprintf(stderr, "ioctl failed %s: %s\n", argv[1],
44 strerror(errno));
45 exit(2);
46 }
47
48 (void) close(fd);
49
50 return (umap ? 0 : 1);
51 }
52