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/*	$NetBSD: example.c,v 1.6 2010/06/22 18:30:20 rmind Exp $	*/

/*-
 * Copyright (c) 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: example.c,v 1.6 2010/06/22 18:30:20 rmind Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/module.h>

/*
 * Last parameter of MODULE macro is a list of names (as string; names are
 * separated by commas) of dependencies.  If module has no dependencies,
 * then NULL should be passed.
 */

MODULE(MODULE_CLASS_MISC, example, NULL);

static int
handle_props(prop_dictionary_t props)
{
	const char *msg;
	prop_string_t str;

	if (props == NULL)
		return EINVAL;

	str = prop_dictionary_get(props, "msg");
	if (str == NULL) {
		printf("The 'msg' property was not given.\n");
		return EINVAL;
	}

	if (prop_object_type(str) != PROP_TYPE_STRING) {
		printf("The 'msg' property is not a string.\n");
		return EINVAL;
	}

	msg = prop_string_cstring_nocopy(str);
	if (msg == NULL) {
		printf("Failed to process the 'msg' property.\n");
	} else {
		printf("The 'msg' property is: %s\n", msg);
	}
	return 0;
}

static int
example_modcmd(modcmd_t cmd, void *arg)
{
	int error;

	switch (cmd) {
	case MODULE_CMD_INIT:
		printf("Example module loaded.\n");
		error = handle_props(arg);
		break;

	case MODULE_CMD_FINI:
		printf("Example module unloaded.\n");
		error = 0;
		break;

	case MODULE_CMD_STAT:
		printf("Example module status queried.\n");
		error = ENOTTY;
		break;

	default:
		error = ENOTTY;
	}

	return error;
}