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 44 static void mdesc_free(void *bufp, size_t size); 45 uint64_t *md_bufp; 46 47 md_t * 48 mdesc_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*/ 96 void 97 mdesc_free(void *bufp, size_t size) 98 { 99 if (bufp) 100 free(bufp); 101 } 102 103 void 104 mdesc_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