SystemConfiguration.fproj/SCDNotifierInformViaSignal.c

   1 /*
   2  * Copyright (c) 2000, 2001, 2004, 2005, 2009-2011, 2015, 2016 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 31, 2000               Allan Nathanson <ajn@apple.com>
  31  * - initial revision
  32  */
  33
  34 #include "SCDynamicStoreInternal.h"
  35 #include "config.h"             /* MiG generated file */
  36
  37 Boolean
  38 SCDynamicStoreNotifySignal(SCDynamicStoreRef store, pid_t pid, int sig)
  39 {
  40         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  41         kern_return_t                   status;
  42         int                             sc_status;
  43         task_t                          task;
  44
  45         if (store == NULL) {
  46                 /* sorry, you must provide a session */
  47                 _SCErrorSet(kSCStatusNoStoreSession);
  48                 return FALSE;
  49         }
  50
  51         if (storePrivate->server == MACH_PORT_NULL) {
  52                 /* sorry, you must have an open session to play */
  53                 _SCErrorSet(kSCStatusNoStoreServer);
  54                 return FALSE;
  55         }
  56
  57         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  58                 /* sorry, you can only have one notification registered at once */
  59                 _SCErrorSet(kSCStatusNotifierActive);
  60                 return FALSE;
  61         }
  62
  63         status = task_for_pid(mach_task_self(), pid, &task);
  64         if (status != KERN_SUCCESS) {
  65                 SC_log(LOG_ERR, "task_for_pid() failed: %s", mach_error_string(status));
  66                 _SCErrorSet(status);
  67                 return FALSE;
  68         }
  69
  70         os_activity_scope(storePrivate->activity);
  71
  72     retry :
  73
  74         status = notifyviasignal(storePrivate->server, task, sig, (int *)&sc_status);
  75
  76         if (__SCDynamicStoreCheckRetryAndHandleError(store,
  77                                                      status,
  78                                                      &sc_status,
  79                                                      "SCDynamicStoreNotifySignal notifyviasignal()")) {
  80                 goto retry;
  81         }
  82
  83         if (status != KERN_SUCCESS) {
  84                 _SCErrorSet(status);
  85                 return FALSE;
  86         }
  87
  88         /* set notifier active */
  89         storePrivate->notifyStatus = Using_NotifierInformViaSignal;
  90
  91         return TRUE;
  92 }