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 http://www.opensolaris.org/os/licensing.
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/*
23 * Copyright 2007 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#include <stdio.h>
30#include <unistd.h>
31#include <stdlib.h>
32#include <sys/types.h>
33#include <alloca.h>
34#include <sys/stat.h>
35#include <malloc.h>
36#include <fcntl.h>
37#include <syslog.h>
38#include <mdesc.h>
39#include <string.h>
40#include <errno.h>
41
42#define	MDESC_PATH	"/devices/pseudo/mdesc@0:mdesc"
43
44static void mdesc_free(void *bufp, size_t size);
45uint64_t *md_bufp;
46
47md_t *
48mdesc_devinit(void)
49{
50	int fd;
51	md_t *mdp;
52	size_t size;
53
54	/*
55	 * We haven't finished using the previous MD/PRI info.
56	 */
57	if (md_bufp != NULL)
58		return (NULL);
59
60	do {
61		if ((fd = open(MDESC_PATH, O_RDONLY, 0)) < 0)
62			break;
63
64		if (ioctl(fd, MDESCIOCGSZ, &size) < 0)
65			break;
66		if ((md_bufp = (uint64_t *)malloc(size)) == NULL) {
67			(void) close(fd);
68			break;
69		}
70
71		/*
72		 * A partial read is as bad as a failed read.
73		 */
74		if (read(fd, md_bufp, size) != size) {
75			free(md_bufp);
76			md_bufp = NULL;
77		}
78
79		(void) close(fd);
80	/*LINTED: E_CONSTANT_CONDITION */
81	} while (0);
82
83	if (md_bufp) {
84		mdp = md_init_intern(md_bufp, malloc, mdesc_free);
85		if (mdp == NULL) {
86			free(md_bufp);
87			md_bufp = NULL;
88		}
89	} else
90		mdp = NULL;
91
92	return (mdp);
93}
94
95/*ARGSUSED*/
96void
97mdesc_free(void *bufp, size_t size)
98{
99	if (bufp)
100		free(bufp);
101}
102
103void
104mdesc_devfini(md_t *mdp)
105{
106	if (mdp)
107		(void) md_fini(mdp);
108
109	if (md_bufp)
110		free(md_bufp);
111	md_bufp = NULL;
112}
113