configd.tproj/_notifyviasignal.c

   1 /*
   2  * Copyright (c) 2000-2004, 2006, 2009, 2011 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 <unistd.h>
  35 #include <sys/types.h>
  36
  37 #include "configd.h"
  38 #include "configd_server.h"
  39 #include "session.h"
  40
  41 __private_extern__
  42 int
  43 __SCDynamicStoreNotifySignal(SCDynamicStoreRef store, pid_t pid, int sig)
  44 {
  45         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  46         CFStringRef                     sessionKey;
  47         CFDictionaryRef                 info;
  48
  49         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  50                 /* sorry, you can only have one notification registered at once */
  51                 return kSCStatusNotifierActive;
  52         }
  53
  54         if (pid == getpid()) {
  55                 /* sorry, you can't request that configd be signalled */
  56                 return kSCStatusInvalidArgument;
  57         }
  58
  59         if ((sig <= 0) || (sig > NSIG)) {
  60                 /* sorry, you must specify a valid signal */
  61                 return kSCStatusInvalidArgument;
  62         }
  63
  64         /* push out a notification if any changes are pending */
  65         sessionKey = CFStringCreateWithFormat(NULL, NULL, CFSTR("%d"), storePrivate->server);
  66         info = CFDictionaryGetValue(sessionData, sessionKey);
  67         CFRelease(sessionKey);
  68         if (info && CFDictionaryContainsKey(info, kSCDChangedKeys)) {
  69                 CFNumberRef     sessionNum;
  70
  71                 if (needsNotification == NULL)
  72                         needsNotification = CFSetCreateMutable(NULL,
  73                                                                0,
  74                                                                &kCFTypeSetCallBacks);
  75
  76                 sessionNum = CFNumberCreate(NULL, kCFNumberIntType, &storePrivate->server);
  77                 CFSetAddValue(needsNotification, sessionNum);
  78                 CFRelease(sessionNum);
  79         }
  80
  81         return kSCStatusOK;
  82 }
  83
  84
  85 __private_extern__
  86 kern_return_t
  87 _notifyviasignal(mach_port_t    server,
  88                  task_t         task,
  89                  int            sig,
  90                  int            *sc_status)
  91 {
  92         serverSessionRef                mySession  = getSession(server);
  93         pid_t                           pid;
  94         kern_return_t                   status;
  95         SCDynamicStorePrivateRef        storePrivate;
  96
  97         if (mySession == NULL) {
  98                 /* sorry, you must have an open session to play */
  99                 *sc_status = kSCStatusNoStoreSession;
 100                 if (task != TASK_NULL) {
 101                         (void) mach_port_deallocate(mach_task_self(), task);
 102                 }
 103                 return KERN_SUCCESS;
 104         }
 105         storePrivate = (SCDynamicStorePrivateRef)mySession->store;
 106
 107         if (task != TASK_NULL) {
 108                 status = pid_for_task(task, &pid);
 109                 if (status != KERN_SUCCESS) {
 110                         /* could not determine pid for task */
 111                         *sc_status = kSCStatusFailed;
 112                         (void) mach_port_deallocate(mach_task_self(), task);
 113                         return KERN_SUCCESS;
 114                 }
 115         } else {
 116                 /* sorry, you must specify a valid task */
 117                 *sc_status = kSCStatusInvalidArgument;
 118                 return KERN_SUCCESS;
 119         }
 120
 121         *sc_status = __SCDynamicStoreNotifySignal(mySession->store, pid, sig);
 122         if (*sc_status != kSCStatusOK) {
 123                 __MACH_PORT_DEBUG(TRUE, "*** _notifyviasignal __SCDynamicStoreNotifySignal failed: releasing task)", task);
 124                 (void) mach_port_deallocate(mach_task_self(), task);
 125                 return KERN_SUCCESS;
 126         }
 127
 128         __MACH_PORT_DEBUG(TRUE, "*** _notifyviasignal", task);
 129         storePrivate->notifyStatus     = Using_NotifierInformViaSignal;
 130         storePrivate->notifySignal     = sig;
 131         storePrivate->notifySignalTask = task;
 132
 133         return KERN_SUCCESS;
 134 }