SCDNotifierInformViaMachPort.c   [plain text]

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 *
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * @APPLE_LICENSE_HEADER_END@
 */

#include <mach/mach.h>
#include <mach/mach_error.h>

#include <SystemConfiguration/SCD.h>
#include "config.h"		/* MiG generated file */
#include "SCDPrivate.h"


SCDStatus
SCDNotifierInformViaMachPort(SCDSessionRef session, mach_msg_id_t identifier, mach_port_t *port)
{
	SCDSessionPrivateRef	sessionPrivate = (SCDSessionPrivateRef)session;
	kern_return_t		status;
	mach_port_t		oldNotify;
	SCDStatus		scd_status;

	SCDLog(LOG_DEBUG, CFSTR("SCDNotifierInformViaMachPort:"));

	if ((session == NULL) || (sessionPrivate->server == MACH_PORT_NULL)) {
		return SCD_NOSESSION;	/* you must have an open session to play */
	}

	if (sessionPrivate->notifyStatus != NotifierNotRegistered) {
		/* sorry, you can only have one notification registered at once */
		return SCD_NOTIFIERACTIVE;
	}

	SCDLog(LOG_DEBUG, CFSTR("Allocating port (for server response)"));
	status = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, port);
	if (status != KERN_SUCCESS) {
		SCDLog(LOG_DEBUG, CFSTR("mach_port_allocate(): %s"), mach_error_string(status));
		return SCD_FAILED;
	}
	SCDLog(LOG_DEBUG, CFSTR("  port = %d"), *port);

	status = mach_port_insert_right(mach_task_self(),
					*port,
					*port,
					MACH_MSG_TYPE_MAKE_SEND);
	if (status != KERN_SUCCESS) {
		SCDLog(LOG_DEBUG, CFSTR("mach_port_insert_right(): %s"), mach_error_string(status));
		(void) mach_port_destroy(mach_task_self(), *port);
		*port = MACH_PORT_NULL;
		return SCD_FAILED;
	}

	/* Request a notification when/if the server dies */
	status = mach_port_request_notification(mach_task_self(),
						*port,
						MACH_NOTIFY_NO_SENDERS,
						1,
						*port,
						MACH_MSG_TYPE_MAKE_SEND_ONCE,
						&oldNotify);
	if (status != KERN_SUCCESS) {
		SCDLog(LOG_DEBUG, CFSTR("mach_port_request_notification(): %s"), mach_error_string(status));
		(void) mach_port_destroy(mach_task_self(), *port);
		*port = MACH_PORT_NULL;
		return SCD_FAILED;
	}

#ifdef	DEBUG
	if (oldNotify != MACH_PORT_NULL) {
		SCDLog(LOG_DEBUG, CFSTR("SCDNotifierInformViaMachPort(): why is oldNotify != MACH_PORT_NULL?"));
	}
#endif	/* DEBUG */

	status = notifyviaport(sessionPrivate->server,
			       *port,
			       identifier,
			       (int *)&scd_status);

	if (status != KERN_SUCCESS) {
		if (status != MACH_SEND_INVALID_DEST)
			SCDLog(LOG_DEBUG, CFSTR("notifyviaport(): %s"), mach_error_string(status));
		(void) mach_port_destroy(mach_task_self(), *port);
		*port = MACH_PORT_NULL;
		(void) mach_port_destroy(mach_task_self(), sessionPrivate->server);
		sessionPrivate->server = MACH_PORT_NULL;
		return SCD_NOSERVER;
	}

	/* set notifier active */
	sessionPrivate->notifyStatus = Using_NotifierInformViaMachPort;

	return scd_status;
}