init.c revision 0d63ce2b32a9e1cc8ed71d4d92536c44d66a530a
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <alloca.h>
#include <sys/stat.h>
#include <malloc.h>
#include <fcntl.h>
#include <syslog.h>
#include <mdesc.h>
#include <string.h>
#include <errno.h>
#define MDESC_PATH "/devices/pseudo/mdesc@0:mdesc"
static void mdesc_free(void *bufp, size_t size);
uint64_t *md_bufp;
md_t *
mdesc_devinit(void)
{
int fd;
md_t *mdp;
size_t size;
/*
* We haven't finished using the previous MD/PRI info.
*/
if (md_bufp != NULL)
return (NULL);
do {
if ((fd = open(MDESC_PATH, O_RDONLY, 0)) < 0)
break;
if (ioctl(fd, MDESCIOCGSZ, &size) < 0)
break;
if ((md_bufp = (uint64_t *)malloc(size)) == NULL) {
(void) close(fd);
break;
}
/*
* A partial read is as bad as a failed read.
*/
if (read(fd, md_bufp, size) != size) {
free(md_bufp);
md_bufp = NULL;
}
(void) close(fd);
/*LINTED: E_CONSTANT_CONDITION */
} while (0);
if (md_bufp) {
mdp = md_init_intern(md_bufp, malloc, mdesc_free);
if (mdp == NULL) {
free(md_bufp);
md_bufp = NULL;
}
} else
mdp = NULL;
return (mdp);
}
/*ARGSUSED*/
void
mdesc_free(void *bufp, size_t size)
{
if (bufp)
free(bufp);
}
void
mdesc_devfini(md_t *mdp)
{
if (mdp)
(void) md_fini(mdp);
if (md_bufp)
free(md_bufp);
md_bufp = NULL;
}