configd.tproj/_configlock.c

   1 /*
   2  * Copyright (c) 2000, 2001, 2003, 2004, 2006, 2009 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 "configd_server.h"
  36 #include "session.h"
  37
  38
  39 __private_extern__
  40 int
  41 __SCDynamicStoreLock(SCDynamicStoreRef store, Boolean recursive)
  42 {
  43         serverSessionRef                mySession;
  44         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  45
  46         if ((store == NULL) || (storePrivate->server == MACH_PORT_NULL)) {
  47                 return kSCStatusNoStoreSession;         /* you must have an open session to play */
  48         }
  49
  50         if (storeLocked > 0) {
  51                 if (storePrivate->locked && recursive) {
  52                         /* if this session holds the lock and this is a recursive (internal) request */
  53                         storeLocked++;
  54                         return kSCStatusOK;
  55                 }
  56                 return kSCStatusLocked;                 /* sorry, someone (you) already have the lock */
  57         }
  58
  59         /* check credentials */
  60         mySession = getSession(storePrivate->server);
  61         if (!hasWriteAccess(mySession)) {
  62                 return kSCStatusAccessError;
  63         }
  64
  65         if (!recursive && _configd_trace) {
  66                 SCTrace(TRUE, _configd_trace, CFSTR("lock    : %5d\n"), storePrivate->server);
  67         }
  68
  69         storeLocked          = 1;       /* global lock flag */
  70         storePrivate->locked = TRUE;    /* per-session lock flag */
  71
  72         /*
  73          * defer all (actually, most) changes until the call to __SCDynamicStoreUnlock()
  74          */
  75         if (storeData_s) {
  76                 CFRelease(storeData_s);
  77                 CFRelease(patternData_s);
  78                 CFRelease(changedKeys_s);
  79                 CFRelease(deferredRemovals_s);
  80                 CFRelease(removedSessionKeys_s);
  81         }
  82         storeData_s          = CFDictionaryCreateMutableCopy(NULL, 0, storeData);
  83         patternData_s        = CFDictionaryCreateMutableCopy(NULL, 0, patternData);
  84         changedKeys_s        = CFSetCreateMutableCopy(NULL, 0, changedKeys);
  85         deferredRemovals_s   = CFSetCreateMutableCopy(NULL, 0, deferredRemovals);
  86         removedSessionKeys_s = CFSetCreateMutableCopy(NULL, 0, removedSessionKeys);
  87
  88         /* Add a "locked" mode run loop source for this port */
  89         CFRunLoopAddSource(CFRunLoopGetCurrent(), mySession->serverRunLoopSource, CFSTR("locked"));
  90
  91         return kSCStatusOK;
  92 }
  93
  94
  95 __private_extern__
  96 kern_return_t
  97 _configlock(mach_port_t server, int *sc_status)
  98 {
  99         serverSessionRef        mySession = getSession(server);
 100
 101         if (mySession == NULL) {
 102                 *sc_status = kSCStatusNoStoreSession;   /* you must have an open session to play */
 103                 return KERN_SUCCESS;
 104         }
 105
 106         *sc_status = __SCDynamicStoreLock(mySession->store, FALSE);
 107         if (*sc_status != kSCStatusOK) {
 108                 return KERN_SUCCESS;
 109         }
 110
 111         return KERN_SUCCESS;
 112 }