[apple/configd.git] / configd.tproj / _SCD.c

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The 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, QUIET ENJOYMENT 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
 *
 * June 2, 2000			Allan Nathanson <ajn@apple.com>
 * - initial revision
 */


#include <unistd.h>

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


__private_extern__ CFMutableDictionaryRef	sessionData		= NULL;

__private_extern__ CFMutableDictionaryRef	storeData		= NULL;
__private_extern__ CFMutableDictionaryRef	storeData_s		= NULL;

__private_extern__ CFMutableDictionaryRef	patternData		= NULL;
__private_extern__ CFMutableDictionaryRef	patternData_s		= NULL;

__private_extern__ CFMutableSetRef		changedKeys		= NULL;
__private_extern__ CFMutableSetRef		changedKeys_s		= NULL;

__private_extern__ CFMutableSetRef		deferredRemovals	= NULL;
__private_extern__ CFMutableSetRef		deferredRemovals_s	= NULL;

__private_extern__ CFMutableSetRef		removedSessionKeys	= NULL;
__private_extern__ CFMutableSetRef		removedSessionKeys_s	= NULL;

__private_extern__ CFMutableSetRef		needsNotification	= NULL;

__private_extern__ int				storeLocked		= 0;		/* > 0 if dynamic store locked */


__private_extern__
void
_swapLockedStoreData()
{
	void	*temp;

	temp                 = storeData;
	storeData            = storeData_s;
	storeData_s          = temp;

	temp                 = patternData;
	patternData          = patternData_s;
	patternData_s        = temp;

	temp                 = changedKeys;
	changedKeys          = changedKeys_s;
	changedKeys_s        = temp;

	temp                 = deferredRemovals;
	deferredRemovals     = deferredRemovals_s;
	deferredRemovals_s   = temp;

	temp                 = removedSessionKeys;
	removedSessionKeys   = removedSessionKeys_s;
	removedSessionKeys_s = temp;

	return;
}


__private_extern__
void
_addWatcher(CFNumberRef sessionNum, CFStringRef watchedKey)
{
	CFDictionaryRef		dict;
	CFMutableDictionaryRef	newDict;
	CFArrayRef		watchers;
	CFMutableArrayRef	newWatchers;
	CFArrayRef		watcherRefs;
	CFMutableArrayRef	newWatcherRefs;
	CFIndex			i;
	int			refCnt;
	CFNumberRef		refNum;

	/*
	 * Get the dictionary associated with this key out of the store
	 */
	dict = CFDictionaryGetValue(storeData, watchedKey);
	if (dict) {
		newDict = CFDictionaryCreateMutableCopy(NULL, 0, dict);
	} else {
		newDict = CFDictionaryCreateMutable(NULL,
						    0,
						    &kCFTypeDictionaryKeyCallBacks,
						    &kCFTypeDictionaryValueCallBacks);
	}

	/*
	 * Get the set of watchers out of the keys dictionary
	 */
	watchers    = CFDictionaryGetValue(newDict, kSCDWatchers);
	watcherRefs = CFDictionaryGetValue(newDict, kSCDWatcherRefs);
	if (watchers) {
		newWatchers    = CFArrayCreateMutableCopy(NULL, 0, watchers);
		newWatcherRefs = CFArrayCreateMutableCopy(NULL, 0, watcherRefs);
	} else {
		newWatchers    = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
		newWatcherRefs = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
	}

	/*
	 * Add my session to the set of watchers
	 */
	i = CFArrayGetFirstIndexOfValue(newWatchers,
					CFRangeMake(0, CFArrayGetCount(newWatchers)),
					sessionNum);
	if (i == kCFNotFound) {
		/* if this is the first instance of this session watching this key */
		CFArrayAppendValue(newWatchers, sessionNum);
		refCnt = 1;
		refNum = CFNumberCreate(NULL, kCFNumberIntType, &refCnt);
		CFArrayAppendValue(newWatcherRefs, refNum);
		CFRelease(refNum);
	} else {
		/* if this is another instance of this session watching this key */
		refNum = CFArrayGetValueAtIndex(newWatcherRefs, i);
		CFNumberGetValue(refNum, kCFNumberIntType, &refCnt);
		refCnt++;
		refNum = CFNumberCreate(NULL, kCFNumberIntType, &refCnt);
		CFArraySetValueAtIndex(newWatcherRefs, i, refNum);
		CFRelease(refNum);
	}

	/*
	 * Update the keys dictionary
	 */
	CFDictionarySetValue(newDict, kSCDWatchers, newWatchers);
	CFRelease(newWatchers);
	CFDictionarySetValue(newDict, kSCDWatcherRefs, newWatcherRefs);
	CFRelease(newWatcherRefs);

	/*
	 * Update the store for this key
	 */
	CFDictionarySetValue(storeData, watchedKey, newDict);
	CFRelease(newDict);

#ifdef	DEBUG
	SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  _addWatcher: %@, %@"), sessionNum, watchedKey);
#endif	/* DEBUG */

	return;
}


__private_extern__
void
_removeWatcher(CFNumberRef sessionNum, CFStringRef watchedKey)
{
	CFDictionaryRef		dict;
	CFMutableDictionaryRef	newDict;
	CFArrayRef		watchers;
	CFMutableArrayRef	newWatchers;
	CFArrayRef		watcherRefs;
	CFMutableArrayRef	newWatcherRefs;
	CFIndex			i;
	int			refCnt;
	CFNumberRef		refNum;

	/*
	 * Get the dictionary associated with this key out of the store
	 */
	dict = CFDictionaryGetValue(storeData, watchedKey);
	if ((dict == NULL) || (CFDictionaryContainsKey(dict, kSCDWatchers) == FALSE)) {
		/* key doesn't exist (isn't this really fatal?) */
#ifdef	DEBUG
		SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  _removeWatcher: %@, %@, key not watched"), sessionNum, watchedKey);
#endif	/* DEBUG */
		return;
	}
	newDict = CFDictionaryCreateMutableCopy(NULL, 0, dict);

	/*
	 * Get the set of watchers out of the keys dictionary and
	 * remove this session from the list.
	 */
	watchers       = CFDictionaryGetValue(newDict, kSCDWatchers);
	newWatchers    = CFArrayCreateMutableCopy(NULL, 0, watchers);

	watcherRefs    = CFDictionaryGetValue(newDict, kSCDWatcherRefs);
	newWatcherRefs = CFArrayCreateMutableCopy(NULL, 0, watcherRefs);

	/* locate the session reference */
	i = CFArrayGetFirstIndexOfValue(newWatchers,
					CFRangeMake(0, CFArrayGetCount(newWatchers)),
					sessionNum);
	if (i == kCFNotFound) {
#ifdef	DEBUG
		SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  _removeWatcher: %@, %@, session not watching"), sessionNum, watchedKey);
#endif	/* DEBUG */
		CFRelease(newDict);
		CFRelease(newWatchers);
		CFRelease(newWatcherRefs);
		return;
	}

	/* remove one session reference */
	refNum = CFArrayGetValueAtIndex(newWatcherRefs, i);
	CFNumberGetValue(refNum, kCFNumberIntType, &refCnt);
	if (--refCnt > 0) {
		refNum = CFNumberCreate(NULL, kCFNumberIntType, &refCnt);
		CFArraySetValueAtIndex(newWatcherRefs, i, refNum);
		CFRelease(refNum);
	} else {
		/* if this was the last reference */
		CFArrayRemoveValueAtIndex(newWatchers, i);
		CFArrayRemoveValueAtIndex(newWatcherRefs, i);
	}

	if (CFArrayGetCount(newWatchers) > 0) {
		/* if this key is still being "watched" */
		CFDictionarySetValue(newDict, kSCDWatchers, newWatchers);
		CFDictionarySetValue(newDict, kSCDWatcherRefs, newWatcherRefs);
	} else {
		/* no watchers left, remove the empty set */
		CFDictionaryRemoveValue(newDict, kSCDWatchers);
		CFDictionaryRemoveValue(newDict, kSCDWatcherRefs);
	}
	CFRelease(newWatchers);
	CFRelease(newWatcherRefs);

	if (CFDictionaryGetCount(newDict) > 0) {
		/* if this key is still active */
		CFDictionarySetValue(storeData, watchedKey, newDict);
	} else {
		/* no information left, remove the empty dictionary */
		CFDictionaryRemoveValue(storeData, watchedKey);
	}
	CFRelease(newDict);

#ifdef	DEBUG
	SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  _removeWatcher: %@, %@"), sessionNum, watchedKey);
#endif	/* DEBUG */

	return;
}


__private_extern__
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
			 */
#ifdef	DEBUG
			if (_configd_verbose) {
				SCLog(TRUE, LOG_DEBUG, CFSTR("sending mach message notification."));
				SCLog(TRUE, LOG_DEBUG, CFSTR("  port  = %d"), storePrivate->notifyPort);
				SCLog(TRUE, LOG_DEBUG, CFSTR("  msgid = %d"), storePrivate->notifyPortIdentifier);
			}
#endif	/* DEBUG */
			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 (status == MACH_SEND_TIMED_OUT) {
				mach_msg_destroy(&msg.header);
			}
		}

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

#ifdef	DEBUG
			if (_configd_verbose) {
				SCLog(TRUE, LOG_DEBUG, CFSTR("sending (UNIX domain) socket notification"));
				SCLog(TRUE, LOG_DEBUG, CFSTR("  fd    = %d"), storePrivate->notifyFile);
				SCLog(TRUE, LOG_DEBUG, CFSTR("  msgid = %d"), storePrivate->notifyFileIdentifier);
			}
#endif	/* DEBUG */

			written = write(storePrivate->notifyFile,
					&storePrivate->notifyFileIdentifier,
					sizeof(storePrivate->notifyFileIdentifier));
			if (written == -1) {
				if (errno == EWOULDBLOCK) {
#ifdef	DEBUG
					SCLog(_configd_verbose, LOG_DEBUG,
					      CFSTR("sorry, only one outstanding notification per session."));
#endif	/* DEBUG */
				} else {
#ifdef	DEBUG
					SCLog(_configd_verbose, LOG_DEBUG,
					      CFSTR("could not send notification, write() failed: %s"),
					      strerror(errno));
#endif	/* DEBUG */
					storePrivate->notifyFile = -1;
				}
			} else if (written != sizeof(storePrivate->notifyFileIdentifier)) {
#ifdef	DEBUG
				SCLog(_configd_verbose, LOG_DEBUG,
				      CFSTR("could not send notification, incomplete write()"));
#endif	/* DEBUG */
				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) {
#ifdef	DEBUG
				if (_configd_verbose) {
					SCLog(TRUE, LOG_DEBUG, CFSTR("sending signal notification"));
					SCLog(TRUE, LOG_DEBUG, CFSTR("  pid    = %d"), pid);
					SCLog(TRUE, LOG_DEBUG, CFSTR("  signal = %d"), storePrivate->notifySignal);
				}
#endif	/* DEBUG */
				if (kill(pid, storePrivate->notifySignal) != 0) {
#ifdef	DEBUG
					SCLog(_configd_verbose, LOG_DEBUG, CFSTR("could not send signal: %s"), strerror(errno));
#endif	/* DEBUG */
					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;
}
Commit	Line	Data
5958d7c0	1	/*
dbf6a266	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
5958d7c0 A	3	*
5958d7c0 A	4	* @APPLE_LICENSE_HEADER_START@
009ee3c6	5	*
009ee3c6 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
5958d7c0 A	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
5958d7c0 A	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
009ee3c6 A	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
	20	*
5958d7c0 A	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23
0fae82ee A	24	/*
	25	* Modification History
	26	*
	27	* June 1, 2001 Allan Nathanson <ajn@apple.com>
	28	* - public API conversion
	29	*
	30	* June 2, 2000 Allan Nathanson <ajn@apple.com>
	31	* - initial revision
	32	*/
	33
5958d7c0	34
dbf6a266 A	35	#include <unistd.h>
dbf6a266 A	36
5958d7c0	37	#include "configd.h"
dbf6a266 A	38	#include "configd_server.h"
dbf6a266 A	39	#include "session.h"
5958d7c0 A	40
5958d7c0 A	41
009ee3c6	42	__private_extern__ CFMutableDictionaryRef sessionData = NULL;
0fae82ee	43
009ee3c6 A	44	__private_extern__ CFMutableDictionaryRef storeData = NULL;
009ee3c6 A	45	__private_extern__ CFMutableDictionaryRef storeData_s = NULL;
5958d7c0	46
009ee3c6 A	47	__private_extern__ CFMutableDictionaryRef patternData = NULL;
009ee3c6 A	48	__private_extern__ CFMutableDictionaryRef patternData_s = NULL;
5958d7c0	49
009ee3c6 A	50	__private_extern__ CFMutableSetRef changedKeys = NULL;
009ee3c6 A	51	__private_extern__ CFMutableSetRef changedKeys_s = NULL;
5958d7c0	52
009ee3c6 A	53	__private_extern__ CFMutableSetRef deferredRemovals = NULL;
009ee3c6 A	54	__private_extern__ CFMutableSetRef deferredRemovals_s = NULL;
5958d7c0	55
009ee3c6 A	56	__private_extern__ CFMutableSetRef removedSessionKeys = NULL;
009ee3c6 A	57	__private_extern__ CFMutableSetRef removedSessionKeys_s = NULL;
5958d7c0	58
009ee3c6	59	__private_extern__ CFMutableSetRef needsNotification = NULL;
5958d7c0	60
009ee3c6	61	__private_extern__ int storeLocked = 0; /* > 0 if dynamic store locked */
5958d7c0	62
009ee3c6 A	63
009ee3c6 A	64	__private_extern__
5958d7c0	65	void
0fae82ee	66	_swapLockedStoreData()
5958d7c0 A	67	{
	68	void *temp;
	69
0fae82ee A	70	temp = storeData;
	71	storeData = storeData_s;
	72	storeData_s = temp;
5958d7c0	73
009ee3c6 A	74	temp = patternData;
	75	patternData = patternData_s;
	76	patternData_s = temp;
	77
5958d7c0 A	78	temp = changedKeys;
	79	changedKeys = changedKeys_s;
	80	changedKeys_s = temp;
	81
	82	temp = deferredRemovals;
	83	deferredRemovals = deferredRemovals_s;
	84	deferredRemovals_s = temp;
	85
	86	temp = removedSessionKeys;
	87	removedSessionKeys = removedSessionKeys_s;
	88	removedSessionKeys_s = temp;
	89
	90	return;
	91	}
	92
	93
009ee3c6	94	__private_extern__
5958d7c0 A	95	void
	96	_addWatcher(CFNumberRef sessionNum, CFStringRef watchedKey)
	97	{
	98	CFDictionaryRef dict;
	99	CFMutableDictionaryRef newDict;
	100	CFArrayRef watchers;
	101	CFMutableArrayRef newWatchers;
	102	CFArrayRef watcherRefs;
	103	CFMutableArrayRef newWatcherRefs;
	104	CFIndex i;
	105	int refCnt;
	106	CFNumberRef refNum;
	107
	108	/*
0fae82ee	109	* Get the dictionary associated with this key out of the store
5958d7c0	110	*/
0fae82ee	111	dict = CFDictionaryGetValue(storeData, watchedKey);
5958d7c0 A	112	if (dict) {
	113	newDict = CFDictionaryCreateMutableCopy(NULL, 0, dict);
	114	} else {
	115	newDict = CFDictionaryCreateMutable(NULL,
	116	0,
	117	&kCFTypeDictionaryKeyCallBacks,
	118	&kCFTypeDictionaryValueCallBacks);
	119	}
	120
	121	/*
	122	* Get the set of watchers out of the keys dictionary
	123	*/
	124	watchers = CFDictionaryGetValue(newDict, kSCDWatchers);
	125	watcherRefs = CFDictionaryGetValue(newDict, kSCDWatcherRefs);
	126	if (watchers) {
	127	newWatchers = CFArrayCreateMutableCopy(NULL, 0, watchers);
	128	newWatcherRefs = CFArrayCreateMutableCopy(NULL, 0, watcherRefs);
	129	} else {
	130	newWatchers = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
	131	newWatcherRefs = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
	132	}
	133
	134	/*
	135	* Add my session to the set of watchers
	136	*/
	137	i = CFArrayGetFirstIndexOfValue(newWatchers,
	138	CFRangeMake(0, CFArrayGetCount(newWatchers)),
	139	sessionNum);
dbf6a266	140	if (i == kCFNotFound) {
5958d7c0 A	141	/* if this is the first instance of this session watching this key */
	142	CFArrayAppendValue(newWatchers, sessionNum);
	143	refCnt = 1;
	144	refNum = CFNumberCreate(NULL, kCFNumberIntType, &refCnt);
	145	CFArrayAppendValue(newWatcherRefs, refNum);
	146	CFRelease(refNum);
	147	} else {
	148	/* if this is another instance of this session watching this key */
	149	refNum = CFArrayGetValueAtIndex(newWatcherRefs, i);
	150	CFNumberGetValue(refNum, kCFNumberIntType, &refCnt);
	151	refCnt++;
	152	refNum = CFNumberCreate(NULL, kCFNumberIntType, &refCnt);
	153	CFArraySetValueAtIndex(newWatcherRefs, i, refNum);
	154	CFRelease(refNum);
	155	}
	156
	157	/*
	158	* Update the keys dictionary
	159	*/
	160	CFDictionarySetValue(newDict, kSCDWatchers, newWatchers);
	161	CFRelease(newWatchers);
	162	CFDictionarySetValue(newDict, kSCDWatcherRefs, newWatcherRefs);
	163	CFRelease(newWatcherRefs);
	164
	165	/*
0fae82ee	166	* Update the store for this key
5958d7c0	167	*/
0fae82ee	168	CFDictionarySetValue(storeData, watchedKey, newDict);
5958d7c0 A	169	CFRelease(newDict);
5958d7c0 A	170
dbf6a266	171	#ifdef DEBUG
0fae82ee	172	SCLog(_configd_verbose, LOG_DEBUG, CFSTR(" _addWatcher: %@, %@"), sessionNum, watchedKey);
dbf6a266	173	#endif /* DEBUG */
5958d7c0 A	174
	175	return;
	176	}
	177
	178
009ee3c6	179	__private_extern__
5958d7c0 A	180	void
	181	_removeWatcher(CFNumberRef sessionNum, CFStringRef watchedKey)
	182	{
	183	CFDictionaryRef dict;
	184	CFMutableDictionaryRef newDict;
	185	CFArrayRef watchers;
	186	CFMutableArrayRef newWatchers;
	187	CFArrayRef watcherRefs;
	188	CFMutableArrayRef newWatcherRefs;
	189	CFIndex i;
	190	int refCnt;
	191	CFNumberRef refNum;
	192
	193	/*
0fae82ee	194	* Get the dictionary associated with this key out of the store
5958d7c0	195	*/
0fae82ee	196	dict = CFDictionaryGetValue(storeData, watchedKey);
5958d7c0 A	197	if ((dict == NULL) \|\| (CFDictionaryContainsKey(dict, kSCDWatchers) == FALSE)) {
5958d7c0 A	198	/* key doesn't exist (isn't this really fatal?) */
dbf6a266	199	#ifdef DEBUG
0fae82ee	200	SCLog(_configd_verbose, LOG_DEBUG, CFSTR(" _removeWatcher: %@, %@, key not watched"), sessionNum, watchedKey);
dbf6a266	201	#endif /* DEBUG */
5958d7c0 A	202	return;
	203	}
	204	newDict = CFDictionaryCreateMutableCopy(NULL, 0, dict);
	205
	206	/*
	207	* Get the set of watchers out of the keys dictionary and
	208	* remove this session from the list.
	209	*/
	210	watchers = CFDictionaryGetValue(newDict, kSCDWatchers);
	211	newWatchers = CFArrayCreateMutableCopy(NULL, 0, watchers);
	212
	213	watcherRefs = CFDictionaryGetValue(newDict, kSCDWatcherRefs);
	214	newWatcherRefs = CFArrayCreateMutableCopy(NULL, 0, watcherRefs);
	215
	216	/* locate the session reference */
	217	i = CFArrayGetFirstIndexOfValue(newWatchers,
	218	CFRangeMake(0, CFArrayGetCount(newWatchers)),
	219	sessionNum);
dbf6a266 A	220	if (i == kCFNotFound) {
dbf6a266 A	221	#ifdef DEBUG
0fae82ee	222	SCLog(_configd_verbose, LOG_DEBUG, CFSTR(" _removeWatcher: %@, %@, session not watching"), sessionNum, watchedKey);
dbf6a266	223	#endif /* DEBUG */
5958d7c0 A	224	CFRelease(newDict);
	225	CFRelease(newWatchers);
	226	CFRelease(newWatcherRefs);
	227	return;
	228	}
	229
	230	/* remove one session reference */
	231	refNum = CFArrayGetValueAtIndex(newWatcherRefs, i);
	232	CFNumberGetValue(refNum, kCFNumberIntType, &refCnt);
	233	if (--refCnt > 0) {
	234	refNum = CFNumberCreate(NULL, kCFNumberIntType, &refCnt);
	235	CFArraySetValueAtIndex(newWatcherRefs, i, refNum);
	236	CFRelease(refNum);
	237	} else {
	238	/* if this was the last reference */
	239	CFArrayRemoveValueAtIndex(newWatchers, i);
	240	CFArrayRemoveValueAtIndex(newWatcherRefs, i);
	241	}
	242
	243	if (CFArrayGetCount(newWatchers) > 0) {
	244	/* if this key is still being "watched" */
	245	CFDictionarySetValue(newDict, kSCDWatchers, newWatchers);
	246	CFDictionarySetValue(newDict, kSCDWatcherRefs, newWatcherRefs);
	247	} else {
	248	/* no watchers left, remove the empty set */
	249	CFDictionaryRemoveValue(newDict, kSCDWatchers);
	250	CFDictionaryRemoveValue(newDict, kSCDWatcherRefs);
	251	}
	252	CFRelease(newWatchers);
	253	CFRelease(newWatcherRefs);
	254
	255	if (CFDictionaryGetCount(newDict) > 0) {
	256	/* if this key is still active */
0fae82ee	257	CFDictionarySetValue(storeData, watchedKey, newDict);
5958d7c0 A	258	} else {
5958d7c0 A	259	/* no information left, remove the empty dictionary */
0fae82ee	260	CFDictionaryRemoveValue(storeData, watchedKey);
5958d7c0 A	261	}
	262	CFRelease(newDict);
	263
dbf6a266	264	#ifdef DEBUG
0fae82ee	265	SCLog(_configd_verbose, LOG_DEBUG, CFSTR(" _removeWatcher: %@, %@"), sessionNum, watchedKey);
dbf6a266 A	266	#endif /* DEBUG */
	267
	268	return;
	269	}
	270
	271
	272	__private_extern__
	273	void
	274	pushNotifications()
	275	{
	276	const void **sessionsToNotify;
	277	CFIndex notifyCnt;
	278	int server;
	279	serverSessionRef theSession;
	280	SCDynamicStorePrivateRef storePrivate;
	281
	282	if (needsNotification == NULL)
	283	return; /* if no sessions need to be kicked */
	284
	285	notifyCnt = CFSetGetCount(needsNotification);
	286	sessionsToNotify = malloc(notifyCnt * sizeof(CFNumberRef));
	287	CFSetGetValues(needsNotification, sessionsToNotify);
	288	while (--notifyCnt >= 0) {
	289	(void) CFNumberGetValue(sessionsToNotify[notifyCnt],
	290	kCFNumberIntType,
	291	&server);
	292	theSession = getSession(server);
	293	storePrivate = (SCDynamicStorePrivateRef)theSession->store;
	294
	295	/*
	296	* deliver notifications to client sessions
	297	*/
	298	if ((storePrivate->notifyStatus == Using_NotifierInformViaMachPort) &&
	299	(storePrivate->notifyPort != MACH_PORT_NULL)) {
	300	mach_msg_empty_send_t msg;
	301	mach_msg_option_t options;
	302	kern_return_t status;
	303	/*
	304	* Post notification as mach message
	305	*/
	306	#ifdef DEBUG
	307	if (_configd_verbose) {
	308	SCLog(TRUE, LOG_DEBUG, CFSTR("sending mach message notification."));
	309	SCLog(TRUE, LOG_DEBUG, CFSTR(" port = %d"), storePrivate->notifyPort);
	310	SCLog(TRUE, LOG_DEBUG, CFSTR(" msgid = %d"), storePrivate->notifyPortIdentifier);
	311	}
	312	#endif /* DEBUG */
	313	msg.header.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, 0);
	314	msg.header.msgh_size = sizeof(msg);
	315	msg.header.msgh_remote_port = storePrivate->notifyPort;
	316	msg.header.msgh_local_port = MACH_PORT_NULL;
	317	msg.header.msgh_id = storePrivate->notifyPortIdentifier;
	318	options = MACH_SEND_TIMEOUT;
	319	status = mach_msg(&msg.header, /* msg */
	320	MACH_SEND_MSG\|options, /* options */
	321	msg.header.msgh_size, /* send_size */
	322	0, /* rcv_size */
	323	MACH_PORT_NULL, /* rcv_name */
	324	0, /* timeout */
	325	MACH_PORT_NULL); /* notify */
	326	if (status == MACH_SEND_TIMED_OUT) {
	327	mach_msg_destroy(&msg.header);
	328	}
	329	}
330
331	if ((storePrivate->notifyStatus == Using_NotifierInformViaFD) &&
332	(storePrivate->notifyFile >= 0)) {
333	ssize_t written;
334
335	#ifdef DEBUG
336	if (_configd_verbose) {
337	SCLog(TRUE, LOG_DEBUG, CFSTR("sending (UNIX domain) socket notification"));
338	SCLog(TRUE, LOG_DEBUG, CFSTR(" fd = %d"), storePrivate->notifyFile);
339	SCLog(TRUE, LOG_DEBUG, CFSTR(" msgid = %d"), storePrivate->notifyFileIdentifier);
340	}
341	#endif /* DEBUG */
342
343	written = write(storePrivate->notifyFile,
344	&storePrivate->notifyFileIdentifier,
345	sizeof(storePrivate->notifyFileIdentifier));
346	if (written == -1) {
347	if (errno == EWOULDBLOCK) {
348	#ifdef DEBUG
349	SCLog(_configd_verbose, LOG_DEBUG,
350	CFSTR("sorry, only one outstanding notification per session."));
351	#endif /* DEBUG */
352	} else {
353	#ifdef DEBUG
354	SCLog(_configd_verbose, LOG_DEBUG,
355	CFSTR("could not send notification, write() failed: %s"),
356	strerror(errno));
357	#endif /* DEBUG */
358	storePrivate->notifyFile = -1;
359	}
360	} else if (written != sizeof(storePrivate->notifyFileIdentifier)) {
361	#ifdef DEBUG
362	SCLog(_configd_verbose, LOG_DEBUG,
363	CFSTR("could not send notification, incomplete write()"));
364	#endif /* DEBUG */
365	storePrivate->notifyFile = -1;
366	}
367	}
368
369	if ((storePrivate->notifyStatus == Using_NotifierInformViaSignal) &&
370	(storePrivate->notifySignal > 0)) {
371	kern_return_t status;
372	pid_t pid;
373	/*
374	* Post notification as signal
375	*/
376	status = pid_for_task(storePrivate->notifySignalTask, &pid);
377	if (status == KERN_SUCCESS) {
378	#ifdef DEBUG
379	if (_configd_verbose) {
380	SCLog(TRUE, LOG_DEBUG, CFSTR("sending signal notification"));
381	SCLog(TRUE, LOG_DEBUG, CFSTR(" pid = %d"), pid);
382	SCLog(TRUE, LOG_DEBUG, CFSTR(" signal = %d"), storePrivate->notifySignal);
383	}
384	#endif /* DEBUG */
385	if (kill(pid, storePrivate->notifySignal) != 0) {
386	#ifdef DEBUG
387	SCLog(_configd_verbose, LOG_DEBUG, CFSTR("could not send signal: %s"), strerror(errno));
388	#endif /* DEBUG */
389	status = KERN_FAILURE;
390	}
391	} else {
392	mach_port_type_t pt;
393
394	if ((mach_port_type(mach_task_self(), storePrivate->notifySignalTask, &pt) == KERN_SUCCESS) &&
395	(pt & MACH_PORT_TYPE_DEAD_NAME)) {
396	SCLog(_configd_verbose, LOG_DEBUG, CFSTR("could not send signal, process died"));
397	} else {
398	SCLog(_configd_verbose, LOG_DEBUG, CFSTR("could not send signal: %s"), mach_error_string(status));
399	}
400	}
401
402	if (status != KERN_SUCCESS) {
403	/* don't bother with any more attempts */
404	(void) mach_port_destroy(mach_task_self(), storePrivate->notifySignalTask);
405	storePrivate->notifySignal = 0;
406	storePrivate->notifySignalTask = TASK_NULL;
407	}
408	}
409	}
410	free(sessionsToNotify);
411
412	/*
413	* this list of notifications have been posted, wait for some more.
414	*/
415	CFRelease(needsNotification);
416	needsNotification = NULL;
5958d7c0 A	417
	418	return;
	419	}