configd.tproj/_notifyviasignal.c

   1 /*
   2  * Copyright (c) 2000-2003 Apple Computer, 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 "configd.h"
  35 #include "configd_server.h"
  36 #include "session.h"
  37
  38 __private_extern__
  39 int
  40 __SCDynamicStoreNotifySignal(SCDynamicStoreRef store, pid_t pid, int sig)
  41 {
  42         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  43         CFStringRef                     sessionKey;
  44         CFDictionaryRef                 info;
  45
  46         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("__SCDynamicStoreNotifySignal:"));
  47
  48         if (!store || (storePrivate->server == MACH_PORT_NULL)) {
  49                 return kSCStatusNoStoreSession; /* you must have an open session to play */
  50         }
  51
  52         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  53                 /* sorry, you can only have one notification registered at once */
  54                 return kSCStatusNotifierActive;
  55         }
  56
  57         if (pid == getpid()) {
  58                 /* sorry, you can't request that configd be signalled */
  59                 return kSCStatusInvalidArgument;
  60         }
  61
  62         if ((sig <= 0) || (sig > NSIG)) {
  63                 /* sorry, you must specify a valid signal */
  64                 return kSCStatusInvalidArgument;
  65         }
  66
  67         /* push out a notification if any changes are pending */
  68         sessionKey = CFStringCreateWithFormat(NULL, NULL, CFSTR("%d"), storePrivate->server);
  69         info = CFDictionaryGetValue(sessionData, sessionKey);
  70         CFRelease(sessionKey);
  71         if (info && CFDictionaryContainsKey(info, kSCDChangedKeys)) {
  72                 CFNumberRef     sessionNum;
  73
  74                 if (needsNotification == NULL)
  75                         needsNotification = CFSetCreateMutable(NULL,
  76                                                                0,
  77                                                                &kCFTypeSetCallBacks);
  78
  79                 sessionNum = CFNumberCreate(NULL, kCFNumberIntType, &storePrivate->server);
  80                 CFSetAddValue(needsNotification, sessionNum);
  81                 CFRelease(sessionNum);
  82         }
  83
  84         return kSCStatusOK;
  85 }
  86
  87
  88 __private_extern__
  89 kern_return_t
  90 _notifyviasignal(mach_port_t    server,
  91                  task_t         task,
  92                  int            sig,
  93                  int            *sc_status)
  94 {
  95         serverSessionRef                mySession  = getSession(server);
  96         pid_t                           pid;
  97         kern_return_t                   status;
  98         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)mySession->store;
  99 #ifdef  NOTYET
 100         mach_port_t                     oldNotify;
 101 #endif  /* NOTYET */
 102
 103         if (_configd_verbose) {
 104                 SCLog(TRUE, LOG_DEBUG, CFSTR("Send signal when a notification key changes."));
 105                 SCLog(TRUE, LOG_DEBUG, CFSTR("  server = %d"), server);
 106                 SCLog(TRUE, LOG_DEBUG, CFSTR("  task   = %d"), task);
 107                 SCLog(TRUE, LOG_DEBUG, CFSTR("  signal = %d"), sig);
 108         }
 109
 110         status = pid_for_task(task, &pid);
 111         if (status != KERN_SUCCESS) {
 112                 *sc_status = kSCStatusFailed;           /* could not determine pid for task */
 113                 return KERN_SUCCESS;
 114         }
 115
 116         if (!mySession) {
 117                 *sc_status = kSCStatusNoStoreSession;   /* you must have an open session to play */
 118                 return KERN_SUCCESS;
 119         }
 120
 121         *sc_status = __SCDynamicStoreNotifySignal(mySession->store, pid, sig);
 122         if (*sc_status != kSCStatusOK) {
 123                 if (task != TASK_NULL) {
 124                         (void) mach_port_destroy(mach_task_self(), task);
 125                 }
 126                 return KERN_SUCCESS;
 127         }
 128
 129 #ifdef  DEBUG
 130         {       mach_port_type_t        pt;
 131
 132                 status = mach_port_type(mach_task_self(), task, &pt);
 133                 if (status == MACH_MSG_SUCCESS) {
 134                         char    rights[8], *rp = &rights[0];
 135
 136                         if (pt & MACH_PORT_TYPE_SEND)
 137                                 *rp++ = 'S';
 138                         if (pt & MACH_PORT_TYPE_RECEIVE)
 139                                 *rp++ = 'R';
 140                         if (pt & MACH_PORT_TYPE_SEND_ONCE)
 141                                 *rp++ = 'O';
 142                         if (pt & MACH_PORT_TYPE_PORT_SET)
 143                                 *rp++ = 'P';
 144                         if (pt & MACH_PORT_TYPE_DEAD_NAME)
 145                                 *rp++ = 'D';
 146                         *rp = '\0';
 147
 148                         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Task %d, port rights = %s"), task, rights);
 149                 }
 150         }
 151 #endif  /* DEBUG */
 152
 153 #ifdef  NOTYET
 154         /* Request a notification when/if the client dies */
 155         status = mach_port_request_notification(mach_task_self(),
 156                                                 task,
 157                                                 MACH_NOTIFY_DEAD_NAME,
 158                                                 1,
 159                                                 task,
 160                                                 MACH_MSG_TYPE_MAKE_SEND_ONCE,
 161                                                 &oldNotify);
 162         if (status != KERN_SUCCESS) {
 163                 SCLog(_configd_verbose, LOG_DEBUG, CFSTR("mach_port_request_notification(): %s"), mach_error_string(status));
 164                 *sc_status = kSCStatusFailed;
 165                 return KERN_SUCCESS;
 166         }
 167
 168         if (oldNotify != MACH_PORT_NULL) {
 169                 SCLog(_configd_verbose, LOG_ERR, CFSTR("_notifyviasignal(): why is oldNotify != MACH_PORT_NULL?"));
 170         }
 171
 172         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Adding task notification port %d to the server's port set"), task);
 173         status = mach_port_move_member(mach_task_self(), task, server_ports);
 174         if (status != KERN_SUCCESS) {
 175                 SCLog(_configd_verbose, LOG_DEBUG, CFSTR("mach_port_move_member(): %s"), mach_error_string(status));
 176                 *sc_status = kSCStatusFailed;
 177                 return KERN_SUCCESS;
 178         }
 179 #endif  /* NOTYET */
 180
 181         storePrivate->notifyStatus     = Using_NotifierInformViaSignal;
 182         storePrivate->notifySignal     = sig;
 183         storePrivate->notifySignalTask = task;
 184
 185         return KERN_SUCCESS;
 186 }