configd.tproj/_notifyviasignal.c

   1 /*
   2  * Copyright (c) 2000-2004, 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 <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 ((store == NULL) || (storePrivate->server == MACH_PORT_NULL)) {
  50                 return kSCStatusNoStoreSession; /* you must have an open session to play */
  51         }
  52
  53         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  54                 /* sorry, you can only have one notification registered at once */
  55                 return kSCStatusNotifierActive;
  56         }
  57
  58         if (pid == getpid()) {
  59                 /* sorry, you can't request that configd be signalled */
  60                 return kSCStatusInvalidArgument;
  61         }
  62
  63         if ((sig <= 0) || (sig > NSIG)) {
  64                 /* sorry, you must specify a valid signal */
  65                 return kSCStatusInvalidArgument;
  66         }
  67
  68         /* push out a notification if any changes are pending */
  69         sessionKey = CFStringCreateWithFormat(NULL, NULL, CFSTR("%d"), storePrivate->server);
  70         info = CFDictionaryGetValue(sessionData, sessionKey);
  71         CFRelease(sessionKey);
  72         if (info && CFDictionaryContainsKey(info, kSCDChangedKeys)) {
  73                 CFNumberRef     sessionNum;
  74
  75                 if (needsNotification == NULL)
  76                         needsNotification = CFSetCreateMutable(NULL,
  77                                                                0,
  78                                                                &kCFTypeSetCallBacks);
  79
  80                 sessionNum = CFNumberCreate(NULL, kCFNumberIntType, &storePrivate->server);
  81                 CFSetAddValue(needsNotification, sessionNum);
  82                 CFRelease(sessionNum);
  83         }
  84
  85         return kSCStatusOK;
  86 }
  87
  88
  89 __private_extern__
  90 kern_return_t
  91 _notifyviasignal(mach_port_t    server,
  92                  task_t         task,
  93                  int            sig,
  94                  int            *sc_status)
  95 {
  96         serverSessionRef                mySession  = getSession(server);
  97         pid_t                           pid;
  98         kern_return_t                   status;
  99         SCDynamicStorePrivateRef        storePrivate;
 100
 101         if (mySession == NULL) {
 102                 /* sorry, you must have an open session to play */
 103                 *sc_status = kSCStatusNoStoreSession;
 104                 if (task != TASK_NULL) {
 105                         (void) mach_port_deallocate(mach_task_self(), task);
 106                 }
 107                 return KERN_SUCCESS;
 108         }
 109         storePrivate = (SCDynamicStorePrivateRef)mySession->store;
 110
 111         if (task != TASK_NULL) {
 112                 status = pid_for_task(task, &pid);
 113                 if (status != KERN_SUCCESS) {
 114                         /* could not determine pid for task */
 115                         *sc_status = kSCStatusFailed;
 116                         (void) mach_port_deallocate(mach_task_self(), task);
 117                         return KERN_SUCCESS;
 118                 }
 119         } else {
 120                 /* sorry, you must specify a valid task */
 121                 *sc_status = kSCStatusInvalidArgument;
 122                 return KERN_SUCCESS;
 123         }
 124
 125         *sc_status = __SCDynamicStoreNotifySignal(mySession->store, pid, sig);
 126         if (*sc_status != kSCStatusOK) {
 127                 __MACH_PORT_DEBUG(TRUE, "*** _notifyviasignal __SCDynamicStoreNotifySignal failed: releasing task)", task);
 128                 (void) mach_port_deallocate(mach_task_self(), task);
 129                 return KERN_SUCCESS;
 130         }
 131
 132         __MACH_PORT_DEBUG(TRUE, "*** _notifyviasignal", task);
 133         storePrivate->notifyStatus     = Using_NotifierInformViaSignal;
 134         storePrivate->notifySignal     = sig;
 135         storePrivate->notifySignalTask = task;
 136
 137         return KERN_SUCCESS;
 138 }