configd.tproj/_notifyviasignal.c

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22
  23 /*
  24  * Modification History
  25  *
  26  * June 1, 2001                 Allan Nathanson <ajn@apple.com>
  27  * - public API conversion
  28  *
  29  * March 24, 2000               Allan Nathanson <ajn@apple.com>
  30  * - initial revision
  31  */
  32
  33 #include "configd.h"
  34 #include "configd_server.h"
  35 #include "session.h"
  36
  37 int
  38 __SCDynamicStoreNotifySignal(SCDynamicStoreRef store, pid_t pid, int sig)
  39 {
  40         SCDynamicStorePrivateRef        storePrivate = (SCDynamicStorePrivateRef)store;
  41         CFStringRef                     sessionKey;
  42         CFDictionaryRef                 info;
  43
  44         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("__SCDynamicStoreNotifySignal:"));
  45
  46         if (!store || (storePrivate->server == MACH_PORT_NULL)) {
  47                 return kSCStatusNoStoreSession; /* you must have an open session to play */
  48         }
  49
  50         if (storePrivate->notifyStatus != NotifierNotRegistered) {
  51                 /* sorry, you can only have one notification registered at once */
  52                 return kSCStatusNotifierActive;
  53         }
  54
  55         if (pid == getpid()) {
  56                 /* sorry, you can't request that configd be signalled */
  57                 return kSCStatusInvalidArgument;
  58         }
  59
  60         if ((sig <= 0) || (sig > NSIG)) {
  61                 /* sorry, you must specify a valid signal */
  62                 return kSCStatusInvalidArgument;
  63         }
  64
  65         /* push out a notification if any changes are pending */
  66         sessionKey = CFStringCreateWithFormat(NULL, NULL, CFSTR("%d"), storePrivate->server);
  67         info = CFDictionaryGetValue(sessionData, sessionKey);
  68         CFRelease(sessionKey);
  69         if (info && CFDictionaryContainsKey(info, kSCDChangedKeys)) {
  70                 CFNumberRef     sessionNum;
  71
  72                 if (needsNotification == NULL)
  73                         needsNotification = CFSetCreateMutable(NULL,
  74                                                                0,
  75                                                                &kCFTypeSetCallBacks);
  76
  77                 sessionNum = CFNumberCreate(NULL, kCFNumberIntType, &storePrivate->server);
  78                 CFSetAddValue(needsNotification, sessionNum);
  79                 CFRelease(sessionNum);
  80         }
  81
  82         return kSCStatusOK;
  83 }
  84
  85
  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 = (SCDynamicStorePrivateRef)mySession->store;
  96 #ifdef  NOTYET
  97         mach_port_t                     oldNotify;
  98 #endif  /* NOTYET */
  99
 100         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Send signal when a notification key changes."));
 101         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  server = %d"), server);
 102         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  task   = %d"), task);
 103         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("  signal = %d"), sig);
 104
 105         status = pid_for_task(task, &pid);
 106         if (status != KERN_SUCCESS) {
 107                 /* could not determine pid for task */
 108                 *sc_status = kSCStatusFailed;
 109                 return KERN_SUCCESS;
 110         }
 111
 112         *sc_status = __SCDynamicStoreNotifySignal(mySession->store, pid, sig);
 113         if (*sc_status != kSCStatusOK) {
 114                 if (task != TASK_NULL) {
 115                         (void) mach_port_destroy(mach_task_self(), task);
 116                 }
 117                 return KERN_SUCCESS;
 118         }
 119
 120 #ifdef  DEBUG
 121         {       mach_port_type_t        pt;
 122
 123                 status = mach_port_type(mach_task_self(), task, &pt);
 124                 if (status == MACH_MSG_SUCCESS) {
 125                         char    rights[8], *rp = &rights[0];
 126
 127                         if (pt & MACH_PORT_TYPE_SEND)
 128                                 *rp++ = 'S';
 129                         if (pt & MACH_PORT_TYPE_RECEIVE)
 130                                 *rp++ = 'R';
 131                         if (pt & MACH_PORT_TYPE_SEND_ONCE)
 132                                 *rp++ = 'O';
 133                         if (pt & MACH_PORT_TYPE_PORT_SET)
 134                                 *rp++ = 'P';
 135                         if (pt & MACH_PORT_TYPE_DEAD_NAME)
 136                                 *rp++ = 'D';
 137                         *rp = '\0';
 138
 139                         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Task %d, port rights = %s"), task, rights);
 140                 }
 141         }
 142 #endif  /* DEBUG */
 143
 144 #ifdef  NOTYET
 145         /* Request a notification when/if the client dies */
 146         status = mach_port_request_notification(mach_task_self(),
 147                                                 task,
 148                                                 MACH_NOTIFY_DEAD_NAME,
 149                                                 1,
 150                                                 task,
 151                                                 MACH_MSG_TYPE_MAKE_SEND_ONCE,
 152                                                 &oldNotify);
 153         if (status != KERN_SUCCESS) {
 154                 SCLog(_configd_verbose, LOG_DEBUG, CFSTR("mach_port_request_notification(): %s"), mach_error_string(status));
 155                 *sc_status = kSCStatusFailed;
 156                 return KERN_SUCCESS;
 157         }
 158
 159         if (oldNotify != MACH_PORT_NULL) {
 160                 SCLog(_configd_verbose, LOG_ERR, CFSTR("_notifyviasignal(): why is oldNotify != MACH_PORT_NULL?"));
 161         }
 162
 163         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Adding task notification port %d to the server's port set"), task);
 164         status = mach_port_move_member(mach_task_self(), task, server_ports);
 165         if (status != KERN_SUCCESS) {
 166                 SCLog(_configd_verbose, LOG_DEBUG, CFSTR("mach_port_move_member(): %s"), mach_error_string(status));
 167                 *sc_status = kSCStatusFailed;
 168                 return KERN_SUCCESS;
 169         }
 170 #endif  /* NOTYET */
 171
 172         storePrivate->notifyStatus     = Using_NotifierInformViaSignal;
 173         storePrivate->notifySignal     = sig;
 174         storePrivate->notifySignalTask = task;
 175
 176         return KERN_SUCCESS;
 177 }