configd.tproj/_notifyviasignal.c

   1 /*
   2  * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 /*
  27  * Modification History
  28  *
  29  * June 1, 2001                 Allan Nathanson <ajn@apple.com>
  30  * - public API conversion
  31  *
  32  * March 24, 2000               Allan Nathanson <ajn@apple.com>
  33  * - initial revision
  34  */
  35
  36 #include "configd.h"
  37 #include "configd_server.h"
  38 #include "session.h"
  39
  40 __private_extern__
  41 int
  42 __SCDynamicStoreNotifySignal(SCDynamicStoreRef store, pid_t pid, int sig)
  43 {
  44         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  45         CFStringRef                     sessionKey;
  46         CFDictionaryRef                 info;
  47
  48         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("__SCDynamicStoreNotifySignal:"));
  49
  50         if (!store || (storePrivate->server == MACH_PORT_NULL)) {
  51                 return kSCStatusNoStoreSession; /* you must have an open session to play */
  52         }
  53
  54         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  55                 /* sorry, you can only have one notification registered at once */
  56                 return kSCStatusNotifierActive;
  57         }
  58
  59         if (pid == getpid()) {
  60                 /* sorry, you can't request that configd be signalled */
  61                 return kSCStatusInvalidArgument;
  62         }
  63
  64         if ((sig <= 0) || (sig > NSIG)) {
  65                 /* sorry, you must specify a valid signal */
  66                 return kSCStatusInvalidArgument;
  67         }
  68
  69         /* push out a notification if any changes are pending */
  70         sessionKey = CFStringCreateWithFormat(NULL, NULL, CFSTR("%d"), storePrivate->server);
  71         info = CFDictionaryGetValue(sessionData, sessionKey);
  72         CFRelease(sessionKey);
  73         if (info && CFDictionaryContainsKey(info, kSCDChangedKeys)) {
  74                 CFNumberRef     sessionNum;
  75
  76                 if (needsNotification == NULL)
  77                         needsNotification = CFSetCreateMutable(NULL,
  78                                                                0,
  79                                                                &kCFTypeSetCallBacks);
  80
  81                 sessionNum = CFNumberCreate(NULL, kCFNumberIntType, &storePrivate->server);
  82                 CFSetAddValue(needsNotification, sessionNum);
  83                 CFRelease(sessionNum);
  84         }
  85
  86         return kSCStatusOK;
  87 }
  88
  89
  90 __private_extern__
  91 kern_return_t
  92 _notifyviasignal(mach_port_t    server,
  93                  task_t         task,
  94                  int            sig,
  95                  int            *sc_status)
  96 {
  97         serverSessionRef                mySession  = getSession(server);
  98         pid_t                           pid;
  99         kern_return_t                   status;
 100         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)mySession->store;
 101 #ifdef  NOTYET
 102         mach_port_t                     oldNotify;
 103 #endif  /* NOTYET */
 104
 105         if (_configd_verbose) {
 106                 SCLog(TRUE, LOG_DEBUG, CFSTR("Send signal when a notification key changes."));
 107                 SCLog(TRUE, LOG_DEBUG, CFSTR("  server = %d"), server);
 108                 SCLog(TRUE, LOG_DEBUG, CFSTR("  task   = %d"), task);
 109                 SCLog(TRUE, LOG_DEBUG, CFSTR("  signal = %d"), sig);
 110         }
 111
 112         status = pid_for_task(task, &pid);
 113         if (status != KERN_SUCCESS) {
 114                 *sc_status = kSCStatusFailed;           /* could not determine pid for task */
 115                 return KERN_SUCCESS;
 116         }
 117
 118         if (!mySession) {
 119                 *sc_status = kSCStatusNoStoreSession;   /* you must have an open session to play */
 120                 return KERN_SUCCESS;
 121         }
 122
 123         *sc_status = __SCDynamicStoreNotifySignal(mySession->store, pid, sig);
 124         if (*sc_status != kSCStatusOK) {
 125                 if (task != TASK_NULL) {
 126                         (void) mach_port_destroy(mach_task_self(), task);
 127                 }
 128                 return KERN_SUCCESS;
 129         }
 130
 131 #ifdef  DEBUG
 132         {       mach_port_type_t        pt;
 133
 134                 status = mach_port_type(mach_task_self(), task, &pt);
 135                 if (status == MACH_MSG_SUCCESS) {
 136                         char    rights[8], *rp = &rights[0];
 137
 138                         if (pt & MACH_PORT_TYPE_SEND)
 139                                 *rp++ = 'S';
 140                         if (pt & MACH_PORT_TYPE_RECEIVE)
 141                                 *rp++ = 'R';
 142                         if (pt & MACH_PORT_TYPE_SEND_ONCE)
 143                                 *rp++ = 'O';
 144                         if (pt & MACH_PORT_TYPE_PORT_SET)
 145                                 *rp++ = 'P';
 146                         if (pt & MACH_PORT_TYPE_DEAD_NAME)
 147                                 *rp++ = 'D';
 148                         *rp = '\0';
 149
 150                         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Task %d, port rights = %s"), task, rights);
 151                 }
 152         }
 153 #endif  /* DEBUG */
 154
 155 #ifdef  NOTYET
 156         /* Request a notification when/if the client dies */
 157         status = mach_port_request_notification(mach_task_self(),
 158                                                 task,
 159                                                 MACH_NOTIFY_DEAD_NAME,
 160                                                 1,
 161                                                 task,
 162                                                 MACH_MSG_TYPE_MAKE_SEND_ONCE,
 163                                                 &oldNotify);
 164         if (status != KERN_SUCCESS) {
 165                 SCLog(_configd_verbose, LOG_DEBUG, CFSTR("mach_port_request_notification(): %s"), mach_error_string(status));
 166                 *sc_status = kSCStatusFailed;
 167                 return KERN_SUCCESS;
 168         }
 169
 170         if (oldNotify != MACH_PORT_NULL) {
 171                 SCLog(_configd_verbose, LOG_ERR, CFSTR("_notifyviasignal(): why is oldNotify != MACH_PORT_NULL?"));
 172         }
 173
 174         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Adding task notification port %d to the server's port set"), task);
 175         status = mach_port_move_member(mach_task_self(), task, server_ports);
 176         if (status != KERN_SUCCESS) {
 177                 SCLog(_configd_verbose, LOG_DEBUG, CFSTR("mach_port_move_member(): %s"), mach_error_string(status));
 178                 *sc_status = kSCStatusFailed;
 179                 return KERN_SUCCESS;
 180         }
 181 #endif  /* NOTYET */
 182
 183         storePrivate->notifyStatus     = Using_NotifierInformViaSignal;
 184         storePrivate->notifySignal     = sig;
 185         storePrivate->notifySignalTask = task;
 186
 187         return KERN_SUCCESS;
 188 }