configd.tproj/_notifyviasignal.c

   1 /*
   2  * Copyright (c) 2000-2004, 2006 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 <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 = (SCDynamicStorePrivateRef)mySession->store;
 100 #ifdef  NOTYET
 101         mach_port_t                     oldNotify;
 102 #endif  /* NOTYET */
 103
 104         status = pid_for_task(task, &pid);
 105         if (status != KERN_SUCCESS) {
 106                 *sc_status = kSCStatusFailed;           /* could not determine pid for task */
 107                 return KERN_SUCCESS;
 108         }
 109
 110         if (mySession == NULL) {
 111                 *sc_status = kSCStatusNoStoreSession;   /* you must have an open session to play */
 112                 return KERN_SUCCESS;
 113         }
 114
 115         *sc_status = __SCDynamicStoreNotifySignal(mySession->store, pid, sig);
 116         if (*sc_status != kSCStatusOK) {
 117                 if (task != TASK_NULL) {
 118                         (void) mach_port_destroy(mach_task_self(), task);
 119                 }
 120                 return KERN_SUCCESS;
 121         }
 122
 123 #ifdef  DEBUG
 124         {       mach_port_type_t        pt;
 125
 126                 status = mach_port_type(mach_task_self(), task, &pt);
 127                 if (status == MACH_MSG_SUCCESS) {
 128                         char    rights[8], *rp = &rights[0];
 129
 130                         if (pt & MACH_PORT_TYPE_SEND)
 131                                 *rp++ = 'S';
 132                         if (pt & MACH_PORT_TYPE_RECEIVE)
 133                                 *rp++ = 'R';
 134                         if (pt & MACH_PORT_TYPE_SEND_ONCE)
 135                                 *rp++ = 'O';
 136                         if (pt & MACH_PORT_TYPE_PORT_SET)
 137                                 *rp++ = 'P';
 138                         if (pt & MACH_PORT_TYPE_DEAD_NAME)
 139                                 *rp++ = 'D';
 140                         *rp = '\0';
 141
 142                         SCLog(_configd_verbose, LOG_DEBUG, CFSTR("Task %d, port rights = %s"), task, rights);
 143                 }
 144         }
 145 #endif  /* DEBUG */
 146
 147 #ifdef  NOTYET
 148         /* Request a notification when/if the client dies */
 149         status = mach_port_request_notification(mach_task_self(),
 150                                                 task,
 151                                                 MACH_NOTIFY_DEAD_NAME,
 152                                                 1,
 153                                                 task,
 154                                                 MACH_MSG_TYPE_MAKE_SEND_ONCE,
 155                                                 &oldNotify);
 156         if (status != KERN_SUCCESS) {
 157                 SCLog(TRUE, LOG_DEBUG, CFSTR("_notifyviasignal mach_port_request_notification() failed: %s"), mach_error_string(status));
 158                 *sc_status = kSCStatusFailed;
 159                 return KERN_SUCCESS;
 160         }
 161
 162 #ifdef  NOTYET_DEBUG
 163         if (oldNotify != MACH_PORT_NULL) {
 164                 SCLog(TRUE, LOG_ERR, CFSTR("_notifyviasignal(): why is oldNotify != MACH_PORT_NULL?"));
 165         }
 166 #endif  /* NOTYET_DEBUG */
 167
 168         // add task notification port to the server's port set
 169         status = mach_port_move_member(mach_task_self(), task, server_ports);
 170         if (status != KERN_SUCCESS) {
 171                 SCLog(TRUE, LOG_DEBUG, CFSTR("_notifyviasignal mach_port_move_member() failed: %s"), mach_error_string(status));
 172                 *sc_status = kSCStatusFailed;
 173                 return KERN_SUCCESS;
 174         }
 175 #endif  /* NOTYET */
 176
 177         storePrivate->notifyStatus     = Using_NotifierInformViaSignal;
 178         storePrivate->notifySignal     = sig;
 179         storePrivate->notifySignalTask = task;
 180
 181         return KERN_SUCCESS;
 182 }