SystemConfiguration.fproj/SCDLock.c

   1 /*
   2  * Copyright (c) 2000, 2001, 2004, 2005, 2009, 2010 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 <mach/mach.h>
  35 #include <mach/mach_error.h>
  36
  37 #include <SystemConfiguration/SystemConfiguration.h>
  38 #include <SystemConfiguration/SCPrivate.h>
  39 #include "SCDynamicStoreInternal.h"
  40 #include "config.h"             /* MiG generated file */
  41
  42 Boolean
  43 SCDynamicStoreLock(SCDynamicStoreRef store)
  44 {
  45         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  46         kern_return_t                   status;
  47         int                             sc_status;
  48
  49         if (store == NULL) {
  50                 /* sorry, you must provide a session */
  51                 _SCErrorSet(kSCStatusNoStoreSession);
  52                 return FALSE;
  53         }
  54
  55         if (storePrivate->server == MACH_PORT_NULL) {
  56                 /* sorry, you must have an open session to play */
  57                 _SCErrorSet(kSCStatusNoStoreServer);
  58                 return FALSE;
  59         }
  60
  61     retry :
  62
  63         /* get the lock from the server */
  64         status = configlock(storePrivate->server, (int *)&sc_status);
  65
  66         if (status != KERN_SUCCESS) {
  67                 if ((status == MACH_SEND_INVALID_DEST) || (status == MIG_SERVER_DIED)) {
  68                         /* the server's gone and our session port's dead, remove the dead name right */
  69                         (void) mach_port_deallocate(mach_task_self(), storePrivate->server);
  70                 } else {
  71                         /* we got an unexpected error, leave the [session] port alone */
  72                         SCLog(TRUE, LOG_ERR, CFSTR("SCDynamicStoreLock configlock(): %s"), mach_error_string(status));
  73                 }
  74                 storePrivate->server = MACH_PORT_NULL;
  75                 if ((status == MACH_SEND_INVALID_DEST) || (status == MIG_SERVER_DIED)) {
  76                         if (__SCDynamicStoreReconnect(store)) {
  77                                 goto retry;
  78                         }
  79                 }
  80                 sc_status = status;
  81         }
  82
  83         if (sc_status != kSCStatusOK) {
  84                 _SCErrorSet(sc_status);
  85                 return FALSE;
  86         }
  87
  88         return TRUE;
  89 }