notify.c   [plain text]

/*
 * Copyright (c) 2000-2002 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@
 */

/*
 * Modification History
 *
 * June 1, 2001			Allan Nathanson <ajn@apple.com>
 * - public API conversion
 *
 * March 31, 2000		Allan Nathanson <ajn@apple.com>
 * - initial revision
 */


#include <unistd.h>

#include "configd.h"
#include "configd_server.h"
#include "session.h"


void
pushNotifications()
{
	const void			**sessionsToNotify;
	CFIndex				notifyCnt;
	int				server;
	serverSessionRef		theSession;
	SCDynamicStorePrivateRef	storePrivate;

	if (needsNotification == NULL)
		return;		/* if no sessions need to be kicked */

	notifyCnt = CFSetGetCount(needsNotification);
	sessionsToNotify = malloc(notifyCnt * sizeof(CFNumberRef));
	CFSetGetValues(needsNotification, sessionsToNotify);
	while (--notifyCnt >= 0) {
		(void) CFNumberGetValue(sessionsToNotify[notifyCnt],
					kCFNumberIntType,
					&server);
		theSession = getSession(server);
		storePrivate = (SCDynamicStorePrivateRef)theSession->store;

		/*
		 * deliver notifications to client sessions
		 */
		if ((storePrivate->notifyStatus == Using_NotifierInformViaMachPort) &&
		    (storePrivate->notifyPort != MACH_PORT_NULL)) {
			mach_msg_empty_send_t	msg;
			mach_msg_option_t	options;
			kern_return_t		status;
			/*
			 * Post notification as mach message
			 */
			SCLog(_configd_verbose, LOG_DEBUG, CFSTR("sending mach message notification."));
			SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  port  = %d"), storePrivate->notifyPort);
			SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  msgid = %d"), storePrivate->notifyPortIdentifier);
			msg.header.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0);
			msg.header.msgh_size = sizeof(msg);
			msg.header.msgh_remote_port = storePrivate->notifyPort;
			msg.header.msgh_local_port = MACH_PORT_NULL;
			msg.header.msgh_id = storePrivate->notifyPortIdentifier;
			options = MACH_SEND_TIMEOUT;
			status = mach_msg(&msg.header,			/* msg */
					  MACH_SEND_MSG|options,	/* options */
					  msg.header.msgh_size,		/* send_size */
					  0,				/* rcv_size */
					  MACH_PORT_NULL,		/* rcv_name */
					  0,				/* timeout */
					  MACH_PORT_NULL);		/* notify */
		}

		if ((storePrivate->notifyStatus == Using_NotifierInformViaFD) &&
		    (storePrivate->notifyFile >= 0)) {
			ssize_t		written;

			SCLog(_configd_verbose, LOG_DEBUG, CFSTR("sending (UNIX domain) socket notification"));
			SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  fd    = %d"), storePrivate->notifyFile);
			SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  msgid = %d"), storePrivate->notifyFileIdentifier);

			written = write(storePrivate->notifyFile,
					&storePrivate->notifyFileIdentifier,
					sizeof(storePrivate->notifyFileIdentifier));
			if (written == -1) {
				if (errno == EWOULDBLOCK) {
					SCLog(_configd_verbose, LOG_DEBUG,
					       CFSTR("sorry, only one outstanding notification per session."));
				} else {
					SCLog(_configd_verbose, LOG_DEBUG,
					       CFSTR("could not send notification, write() failed: %s"),
					       strerror(errno));
					storePrivate->notifyFile = -1;
				}
			} else if (written != sizeof(storePrivate->notifyFileIdentifier)) {
				SCLog(_configd_verbose, LOG_DEBUG,
				       CFSTR("could not send notification, incomplete write()"));
				storePrivate->notifyFile = -1;
			}
		}

		if ((storePrivate->notifyStatus == Using_NotifierInformViaSignal) &&
		    (storePrivate->notifySignal > 0)) {
			kern_return_t	status;
			pid_t		pid;
			/*
			 * Post notification as signal
			 */
			status = pid_for_task(storePrivate->notifySignalTask, &pid);
			if (status == KERN_SUCCESS) {
				SCLog(_configd_verbose, LOG_DEBUG, CFSTR("sending signal notification"));
				SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  pid    = %d"), pid);
				SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  signal = %d"), storePrivate->notifySignal);
				if (kill(pid, storePrivate->notifySignal) != 0) {
					SCLog(_configd_verbose, LOG_DEBUG, CFSTR("could not send signal: %s"), strerror(errno));
					status = KERN_FAILURE;
				}
			} else {
				mach_port_type_t	pt;

				if ((mach_port_type(mach_task_self(), storePrivate->notifySignalTask, &pt) == KERN_SUCCESS) &&
				    (pt & MACH_PORT_TYPE_DEAD_NAME)) {
					SCLog(_configd_verbose, LOG_DEBUG, CFSTR("could not send signal, process died"));
				} else {
					SCLog(_configd_verbose, LOG_DEBUG, CFSTR("could not send signal: %s"), mach_error_string(status));
				}
			}

			if (status != KERN_SUCCESS) {
				/* don't bother with any more attempts */
				(void) mach_port_destroy(mach_task_self(), storePrivate->notifySignalTask);
				storePrivate->notifySignal     = 0;
				storePrivate->notifySignalTask = TASK_NULL;
			}
	       }
	}
	free(sessionsToNotify);

	/*
	 * this list of notifications have been posted, wait for some more.
	 */
	CFRelease(needsNotification);
	needsNotification = NULL;

	return;
}