SystemConfiguration.fproj/scprefs_observer.h

   1 /*
   2  * Copyright (c) 2012-2014, 2017-2019 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 #ifndef _SCPREFS_OBSERVER_H
  25 #define _SCPREFS_OBSERVER_H
  26
  27 #include <os/availability.h>
  28 #include <TargetConditionals.h>
  29 #include <sys/cdefs.h>
  30 #include <dispatch/dispatch.h>
  31
  32 typedef enum {
  33 #if     !TARGET_OS_IPHONE
  34                 scprefs_observer_type_mcx       = 1,
  35 #else   // !TARGET_OS_IPHONE
  36                 scprefs_observer_type_global    = 2,
  37 #endif  // !TARGET_OS_IPHONE
  38 } _scprefs_observer_type;
  39
  40 typedef struct _scprefs_observer_t * scprefs_observer_t;
  41
  42 __BEGIN_DECLS
  43
  44 /*!
  45  @function prefs_observer_watch
  46  @discussion Sends a notification to interested configuration agents
  47  when a particular preference file has changed.
  48  @param type the type of preference (MCX on OSX, Global/Profiles on iOS) to watch.
  49  @param plist_name the name of the plist file to watch.
  50  @param queue the queue to be called back on.
  51  @param block the block to be called back on.
  52  @result Returns the created preferences observer
  53  */
  54 scprefs_observer_t
  55 _scprefs_observer_watch(_scprefs_observer_type type, const char *plist_name,
  56                         dispatch_queue_t queue, dispatch_block_t block);
  57
  58 /*!
  59  @function prefs_observer_watch
  60  @discussion Cancels/deregisters the given preferences watcher.
  61  @param observer the watcher to be cancelled.
  62  */
  63 void
  64 _scprefs_observer_cancel(scprefs_observer_t observer);
  65
  66 __END_DECLS
  67
  68 #endif  /* _SCPREFS_OBSERVER_H */