OpenSolaris_b135/cmd/svc/startd/proc.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*
 * This is in a separate file because procfs.h cannot be included if
 * _FILE_OFFSET_BITES=64 is defined.
 */

#include <procfs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

ctid_t
proc_get_ctid()
{
	id_t ctid;
	int fd;
	ssize_t bytes;
	psinfo_t psinfo;

	fd = open("/proc/self/psinfo", O_RDONLY);
	if (fd < 0)
		return (-1);

	bytes = read(fd, &psinfo, sizeof (psinfo));
	if (bytes == sizeof (psinfo))
		ctid = psinfo.pr_contract;
	else
		ctid = -1;

	(void) close(fd);
	return (ctid);
}