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      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, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 /*
     30  * This is in a separate file because procfs.h cannot be included if
     31  * _FILE_OFFSET_BITES=64 is defined.
     32  */
     33 
     34 #include <procfs.h>
     35 #include <sys/types.h>
     36 #include <sys/stat.h>
     37 #include <fcntl.h>
     38 #include <unistd.h>
     39 
     40 ctid_t
     41 proc_get_ctid()
     42 {
     43 	id_t ctid;
     44 	int fd;
     45 	ssize_t bytes;
     46 	psinfo_t psinfo;
     47 
     48 	fd = open("/proc/self/psinfo", O_RDONLY);
     49 	if (fd < 0)
     50 		return (-1);
     51 
     52 	bytes = read(fd, &psinfo, sizeof (psinfo));
     53 	if (bytes == sizeof (psinfo))
     54 		ctid = psinfo.pr_contract;
     55 	else
     56 		ctid = -1;
     57 
     58 	(void) close(fd);
     59 	return (ctid);
     60 }
     61