/*
 * 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@
 */

/*
 * Modification History
 *
 * June 1, 2001			Allan Nathanson <ajn@apple.com>
 * - public API conversion
 *
 * March 24, 2000		Allan Nathanson <ajn@apple.com>
 * - initial revision
 */

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


int
__SCDynamicStoreLock(SCDynamicStoreRef store, Boolean recursive)
{
	SCDynamicStorePrivateRef	storePrivate = (SCDynamicStorePrivateRef)store;
	serverSessionRef		mySession;

	SCLog(_configd_verbose, LOG_DEBUG, CFSTR("__SCDynamicStoreLock:"));

	if (!store || (storePrivate->server == MACH_PORT_NULL)) {
		return kSCStatusNoStoreSession;		/* you must have an open session to play */
	}

	if (storeLocked > 0) {
		if (storePrivate->locked && recursive) {
			/* if this session holds the lock and this is a recursive (internal) request */
			storeLocked++;
			return kSCStatusOK;
		}
		return kSCStatusLocked;			/* sorry, someone (you) already have the lock */
	}

	/* check credentials */
	mySession = getSession(storePrivate->server);
	if (mySession->callerEUID != 0) {
		return kSCStatusAccessError;
	}

	storeLocked          = 1;	/* global lock flag */
	storePrivate->locked = TRUE;	/* per-session lock flag */

	/*
	 * defer all (actually, most) changes until the call to __SCDynamicStoreUnlock()
	 */
	if (storeData_s) {
		CFRelease(storeData_s);
		CFRelease(changedKeys_s);
		CFRelease(deferredRemovals_s);
		CFRelease(removedSessionKeys_s);
	}
	storeData_s          = CFDictionaryCreateMutableCopy(NULL, 0, storeData);
	changedKeys_s        = CFSetCreateMutableCopy(NULL, 0, changedKeys);
	deferredRemovals_s   = CFSetCreateMutableCopy(NULL, 0, deferredRemovals);
	removedSessionKeys_s = CFSetCreateMutableCopy(NULL, 0, removedSessionKeys);

	/* Add a "locked" mode run loop source for this port */
	CFRunLoopAddSource(CFRunLoopGetCurrent(), mySession->serverRunLoopSource, CFSTR("locked"));

	return kSCStatusOK;
}


kern_return_t
_configlock(mach_port_t server, int *sc_status)
{
	serverSessionRef	mySession = getSession(server);

	SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Lock configuration database."));
	SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  server = %d"), server);

	*sc_status = __SCDynamicStoreLock(mySession->store, FALSE);
	if (*sc_status != kSCStatusOK) {
		SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  SCDynamicStoreLock(): %s"), SCErrorString(*sc_status));
		return KERN_SUCCESS;
	}

	return KERN_SUCCESS;
}