OpenSolaris_b135/cmd/vscan/vscand/vs_door.c

/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"


/*
 * vscand door server
 */

#include <door.h>
#include <errno.h>
#include <syslog.h>
#include <unistd.h>
#include <varargs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <synch.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <pthread.h>
#include "vs_incl.h"

#define	VS_DOOR_VERSION	1
static int vs_door_cookie;

/* function prototype */
static void vs_door_scan_req(void *, char *, size_t, door_desc_t *, uint_t);

/* local data */
static int vs_door_fd = -1;
static pthread_mutex_t vs_door_mutex = PTHREAD_MUTEX_INITIALIZER;


/*
 * vs_door_init
 *
 * Start the vscand door service.
 * Returns 0 on success. Otherwise, -1.
 */
int
vs_door_init(void)
{
	(void) pthread_mutex_lock(&vs_door_mutex);

	if ((vs_door_fd = door_create(vs_door_scan_req,
	    &vs_door_cookie, (DOOR_UNREF | DOOR_REFUSE_DESC))) < 0) {
		syslog(LOG_ERR, "vscand: door create%s", strerror(errno));
		vs_door_fd = -1;
	}

	(void) pthread_mutex_unlock(&vs_door_mutex);
	return (vs_door_fd);
}


/*
 * vscan_door_fini
 *
 * Stop the vscand door service.
 */
void
vs_door_fini(void)
{
	(void) pthread_mutex_lock(&vs_door_mutex);

	if (vs_door_fd >= 0) {
		if (door_revoke(vs_door_fd) < 0)
			syslog(LOG_ERR, "vscand: door revoke %s",
			    strerror(errno));
	}

	vs_door_fd = -1;

	(void) pthread_mutex_unlock(&vs_door_mutex);
}


/*
 * vs_door_scan_req
 *
 * Invoke the vscand door service.
 */
/* ARGSUSED */
static void
vs_door_scan_req(void *cookie, char *ptr, size_t size, door_desc_t *dp,
    uint_t n_desc)
{
	vs_scan_req_t *scan_req;
	uint32_t result = VS_STATUS_ERROR;

	if (ptr != NULL) {
		/* LINTED E_BAD_PTR_CAST_ALIGN - to be fixed with encoding */
		scan_req = (vs_scan_req_t *)ptr;
		result = vs_svc_queue_scan_req(scan_req);
	}

	(void) door_return((char *)&result, sizeof (uint32_t), NULL, 0);
}