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 md_t * 46 mdesc_devinit(void) 47 { 48 int fh; 49 uint8_t *bufp = NULL; 50 int res; 51 int size; 52 int offset; 53 md_t *mdp; 54 55 fh = open(MDESC_PATH, O_RDONLY, 0); 56 if (fh < 0) { 57 return (NULL); 58 } 59 60 size = SIZE; /* initial size */ 61 offset = 0; 62 63 bufp = malloc(size); 64 if (NULL == bufp) { 65 return (NULL); 66 } 67 68 /* OK read until we get a EOF */ 69 70 do { 71 int len; 72 73 len = size - offset; 74 75 while (len < SIZE) { 76 size += SIZE; 77 bufp = realloc(bufp, size); 78 if (NULL == bufp) 79 return (NULL); 80 len = size - offset; 81 } 82 83 do { 84 res = read(fh, bufp+offset, len); 85 } while ((res < 0) && (errno == EAGAIN)); 86 87 if (res < 0) { 88 free(bufp); 89 return (NULL); 90 } 91 92 offset += res; 93 } while (res > 0); 94 95 (void) close(fh); 96 97 bufp = realloc(bufp, offset); 98 if (NULL == bufp) 99 return (NULL); 100 101 mdp = md_init_intern((uint64_t *)bufp, malloc, free); 102 if (NULL == mdp) { 103 free(bufp); 104 return (NULL); 105 } 106 107 return (mdp); 108 } 109