configd.tproj/_notifyviaport.c

   1 /*
   2  * Copyright (c) 2000, 2001, 2003, 2004, 2006, 2009, 2011, 2015, 2019 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   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
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  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  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * Modification History
  26  *
  27  * June 1, 2001                 Allan Nathanson <ajn@apple.com>
  28  * - public API conversion
  29  *
  30  * March 24, 2000               Allan Nathanson <ajn@apple.com>
  31  * - initial revision
  32  */
  33
  34 #include "configd.h"
  35 #include "session.h"
  36
  37 __private_extern__
  38 int
  39 __SCDynamicStoreNotifyMachPort(SCDynamicStoreRef        store,
  40                                mach_msg_id_t            identifier,
  41                                mach_port_t              port)
  42 {
  43         serverSessionRef                mySession;
  44         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  45
  46         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  47                 /* sorry, you can only have one notification registered at once */
  48                 return kSCStatusNotifierActive;
  49         }
  50
  51         if (identifier != 0) {
  52                 /* sorry, the message ID (never used, no longer supported) must be zero */
  53                 return kSCStatusInvalidArgument;
  54         }
  55
  56         if (port == MACH_PORT_NULL) {
  57                 /* sorry, you must specify a valid mach port */
  58                 return kSCStatusInvalidArgument;
  59         }
  60
  61         /* push out a notification if any changes are pending */
  62         mySession = getSession(storePrivate->server);
  63         if (mySession->changedKeys != NULL) {
  64                 CFNumberRef     sessionNum;
  65
  66                 if (needsNotification == NULL)
  67                         needsNotification = CFSetCreateMutable(NULL,
  68                                                                0,
  69                                                                &kCFTypeSetCallBacks);
  70
  71                 sessionNum = CFNumberCreate(NULL, kCFNumberIntType, &storePrivate->server);
  72                 CFSetAddValue(needsNotification, sessionNum);
  73                 CFRelease(sessionNum);
  74         }
  75
  76         return kSCStatusOK;
  77 }
  78
  79
  80 __private_extern__
  81 kern_return_t
  82 _notifyviaport(mach_port_t      server,
  83                mach_port_t      port,
  84                mach_msg_id_t    identifier,
  85                int              *sc_status
  86 )
  87 {
  88         serverSessionRef                mySession       = getSession(server);
  89         SCDynamicStorePrivateRef        storePrivate;
  90
  91         if (mySession == NULL) {
  92                 /* sorry, you must have an open session to play */
  93                 *sc_status = kSCStatusNoStoreSession;
  94                 if (port != MACH_PORT_NULL) {
  95                         (void) mach_port_deallocate(mach_task_self(), port);
  96                 }
  97                 return KERN_SUCCESS;
  98         }
  99         storePrivate = (SCDynamicStorePrivateRef)mySession->store;
 100
 101         *sc_status = __SCDynamicStoreNotifyMachPort(mySession->store, identifier, port);
 102         if (*sc_status != kSCStatusOK) {
 103                 // if we can't enable the notification, release the provided callback port
 104                 if (port != MACH_PORT_NULL) {
 105                         __MACH_PORT_DEBUG(TRUE, "*** _notifyviaport __SCDynamicStoreNotifyMachPort failed: releasing port", port);
 106                         (void) mach_port_deallocate(mach_task_self(), port);
 107                 }
 108                 return KERN_SUCCESS;
 109         }
 110
 111         /* save notification port, requested identifier, and set notifier active */
 112         __MACH_PORT_DEBUG(TRUE, "*** _notifyviaport", port);
 113         storePrivate->notifyStatus         = Using_NotifierInformViaMachPort;
 114         storePrivate->notifyPort           = port;
 115
 116         return KERN_SUCCESS;
 117 }