1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2006 Ricardo Correia. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <unistd.h>
27 #include <stdio.h>
28 #include <errno.h>
29 #include <stdlib.h>
30 #include <limits.h>
31 #include <string.h>
32
33 #include <zone.h>
34
35 zoneid_t
getzoneid(void)36 getzoneid(void)
37 {
38 char path[PATH_MAX];
39 char buf[128] = { '\0' };
40 char *cp;
41
42 int c = snprintf(path, sizeof (path), "/proc/self/ns/user");
43 /* This API doesn't have any error checking... */
44 if (c < 0 || c >= sizeof (path))
45 return (GLOBAL_ZONEID);
46
47 ssize_t r = readlink(path, buf, sizeof (buf) - 1);
48 if (r < 0)
49 return (GLOBAL_ZONEID);
50
51 cp = strchr(buf, '[');
52 if (cp == NULL)
53 return (GLOBAL_ZONEID);
54 cp++;
55
56 unsigned long n = strtoul(cp, NULL, 10);
57 if (n == ULONG_MAX && errno == ERANGE)
58 return (GLOBAL_ZONEID);
59 zoneid_t z = (zoneid_t)n;
60
61 return (z);
62 }
63