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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 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 47 md_t * 48 mdesc_devinit(void) 49 { 50 int fh; 51 uint8_t *bufp = NULL; 52 int res; 53 int size; 54 int offset; 55 md_t *mdp; 56 57 fh = open(MDESC_PATH, O_RDONLY, 0); 58 if (fh < 0) { 59 return (NULL); 60 } 61 62 size = SIZE; /* initial size */ 63 offset = 0; 64 65 bufp = malloc(size); 66 if (NULL == bufp) { 67 return (NULL); 68 } 69 70 /* OK read until we get a EOF */ 71 72 do { 73 int len; 74 75 len = size - offset; 76 77 while (len < SIZE) { 78 size += SIZE; 79 bufp = realloc(bufp, size); 80 if (NULL == bufp) 81 return (NULL); 82 len = size - offset; 83 } 84 85 do { 86 res = read(fh, bufp+offset, len); 87 } while ((res < 0) && (errno == EAGAIN)); 88 89 if (res < 0) { 90 free(bufp); 91 return (NULL); 92 } 93 94 offset += res; 95 } while (res > 0); 96 97 (void) close(fh); 98 99 bufp = realloc(bufp, offset); 100 if (NULL == bufp) 101 return (NULL); 102 103 mdp = md_init_intern((uint64_t *)bufp, malloc, mdesc_free); 104 if (NULL == mdp) { 105 free(bufp); 106 return (NULL); 107 } 108 109 return (mdp); 110 } 111 112 /*ARGSUSED*/ 113 void 114 mdesc_free(void *bufp, size_t size) 115 { 116 free(bufp); 117 } 118