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 2006 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 #define SIZE 8192 44 45 static void mdesc_free(void *bufp, size_t size); 46 uint8_t *md_bufp; 47 48 md_t * 49 mdesc_devinit(void) 50 { 51 int fh; 52 int res; 53 int size; 54 int offset; 55 md_t *mdp; 56 57 if (md_bufp != NULL) 58 return (NULL); 59 60 fh = open(MDESC_PATH, O_RDONLY, 0); 61 if (fh < 0) { 62 return (NULL); 63 } 64 65 size = SIZE; /* initial size */ 66 offset = 0; 67 68 md_bufp = malloc(size); 69 if (NULL == md_bufp) { 70 return (NULL); 71 } 72 73 /* OK read until we get a EOF */ 74 75 do { 76 int len; 77 78 len = size - offset; 79 80 while (len < SIZE) { 81 size += SIZE; 82 md_bufp = realloc(md_bufp, size); 83 if (NULL == md_bufp) 84 return (NULL); 85 len = size - offset; 86 } 87 88 do { 89 res = read(fh, md_bufp + offset, len); 90 } while ((res < 0) && (errno == EAGAIN)); 91 92 if (res < 0) { 93 free(md_bufp); 94 return (NULL); 95 } 96 97 offset += res; 98 } while (res > 0); 99 100 (void) close(fh); 101 102 md_bufp = realloc(md_bufp, offset); 103 if (NULL == md_bufp) 104 return (NULL); 105 106 mdp = md_init_intern((uint64_t *)md_bufp, malloc, mdesc_free); 107 if (NULL == mdp) { 108 free(md_bufp); 109 return (NULL); 110 } 111 112 return (mdp); 113 } 114 115 /*ARGSUSED*/ 116 void 117 mdesc_free(void *bufp, size_t size) 118 { 119 if (bufp) 120 free(bufp); 121 } 122 123 void 124 mdesc_devfini(md_t *mdp) 125 { 126 if (mdp) 127 (void) md_fini(mdp); 128 129 if (md_bufp) 130 free(md_bufp); 131 md_bufp = NULL; 132 } 133