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