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 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 (0); 46 47 ssize_t r = readlink(path, buf, sizeof (buf) - 1); 48 if (r < 0) 49 return (0); 50 51 cp = strchr(buf, '['); 52 if (cp == NULL) 53 return (0); 54 cp++; 55 56 unsigned long n = strtoul(cp, NULL, 10); 57 if (n == ULONG_MAX && errno == ERANGE) 58 return (0); 59 zoneid_t z = (zoneid_t)n; 60 61 return (z); 62 } 63