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 * 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 95 mdesc_free(void *bufp, size_t size) 96 { 97 if (bufp) 98 free(bufp); 99 } 100 101 void 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