SystemConfiguration.fproj/SCDNotifierInformViaSignal.c

   1 /*
   2  * Copyright (c) 2000, 2001, 2004, 2005, 2009-2011, 2015 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 <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 SCDynamicStoreNotifySignal(SCDynamicStoreRef store, pid_t pid, int sig)
  44 {
  45         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  46         kern_return_t                   status;
  47         int                             sc_status;
  48         task_t                          task;
  49
  50         if (store == NULL) {
  51                 /* sorry, you must provide a session */
  52                 _SCErrorSet(kSCStatusNoStoreSession);
  53                 return FALSE;
  54         }
  55
  56         if (storePrivate->server == MACH_PORT_NULL) {
  57                 /* sorry, you must have an open session to play */
  58                 _SCErrorSet(kSCStatusNoStoreServer);
  59                 return FALSE;
  60         }
  61
  62         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  63                 /* sorry, you can only have one notification registered at once */
  64                 _SCErrorSet(kSCStatusNotifierActive);
  65                 return FALSE;
  66         }
  67
  68         status = task_for_pid(mach_task_self(), pid, &task);
  69         if (status != KERN_SUCCESS) {
  70                 SC_log(LOG_ERR, "task_for_pid() failed: %s", mach_error_string(status));
  71                 _SCErrorSet(status);
  72                 return FALSE;
  73         }
  74
  75     retry :
  76
  77         status = notifyviasignal(storePrivate->server, task, sig, (int *)&sc_status);
  78
  79         if (__SCDynamicStoreCheckRetryAndHandleError(store,
  80                                                      status,
  81                                                      &sc_status,
  82                                                      "SCDynamicStoreNotifySignal notifyviasignal()")) {
  83                 goto retry;
  84         }
  85
  86         if (status != KERN_SUCCESS) {
  87                 _SCErrorSet(status);
  88                 return FALSE;
  89         }
  90
  91         /* set notifier active */
  92         storePrivate->notifyStatus = Using_NotifierInformViaSignal;
  93
  94         return TRUE;
  95 }