SystemConfiguration.fproj/SCDNotifierInformViaMachPort.c

   1 /*
   2  * Copyright (c) 2000 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 #include <mach/mach.h>
  24 #include <mach/mach_error.h>
  25
  26 #include <SystemConfiguration/SCD.h>
  27 #include "config.h"             /* MiG generated file */
  28 #include "SCDPrivate.h"
  29
  30
  31 SCDStatus
  32 SCDNotifierInformViaMachPort(SCDSessionRef session, mach_msg_id_t identifier, mach_port_t *port)
  33 {
  34         SCDSessionPrivateRef    sessionPrivate = (SCDSessionPrivateRef)session;
  35         kern_return_t           status;
  36         mach_port_t             oldNotify;
  37         SCDStatus               scd_status;
  38
  39         SCDLog(LOG_DEBUG, CFSTR("SCDNotifierInformViaMachPort:"));
  40
  41         if ((session == NULL) || (sessionPrivate->server == MACH_PORT_NULL)) {
  42                 return SCD_NOSESSION;   /* you must have an open session to play */
  43         }
  44
  45         if (sessionPrivate->notifyStatus != NotifierNotRegistered) {
  46                 /* sorry, you can only have one notification registered at once */
  47                 return SCD_NOTIFIERACTIVE;
  48         }
  49
  50         SCDLog(LOG_DEBUG, CFSTR("Allocating port (for server response)"));
  51         status = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, port);
  52         if (status != KERN_SUCCESS) {
  53                 SCDLog(LOG_DEBUG, CFSTR("mach_port_allocate(): %s"), mach_error_string(status));
  54                 return SCD_FAILED;
  55         }
  56         SCDLog(LOG_DEBUG, CFSTR("  port = %d"), *port);
  57
  58         status = mach_port_insert_right(mach_task_self(),
  59                                         *port,
  60                                         *port,
  61                                         MACH_MSG_TYPE_MAKE_SEND);
  62         if (status != KERN_SUCCESS) {
  63                 SCDLog(LOG_DEBUG, CFSTR("mach_port_insert_right(): %s"), mach_error_string(status));
  64                 (void) mach_port_destroy(mach_task_self(), *port);
  65                 *port = MACH_PORT_NULL;
  66                 return SCD_FAILED;
  67         }
  68
  69         /* Request a notification when/if the server dies */
  70         status = mach_port_request_notification(mach_task_self(),
  71                                                 *port,
  72                                                 MACH_NOTIFY_NO_SENDERS,
  73                                                 1,
  74                                                 *port,
  75                                                 MACH_MSG_TYPE_MAKE_SEND_ONCE,
  76                                                 &oldNotify);
  77         if (status != KERN_SUCCESS) {
  78                 SCDLog(LOG_DEBUG, CFSTR("mach_port_request_notification(): %s"), mach_error_string(status));
  79                 (void) mach_port_destroy(mach_task_self(), *port);
  80                 *port = MACH_PORT_NULL;
  81                 return SCD_FAILED;
  82         }
  83
  84 #ifdef  DEBUG
  85         if (oldNotify != MACH_PORT_NULL) {
  86                 SCDLog(LOG_DEBUG, CFSTR("SCDNotifierInformViaMachPort(): why is oldNotify != MACH_PORT_NULL?"));
  87         }
  88 #endif  /* DEBUG */
  89
  90         status = notifyviaport(sessionPrivate->server,
  91                                *port,
  92                                identifier,
  93                                (int *)&scd_status);
  94
  95         if (status != KERN_SUCCESS) {
  96                 if (status != MACH_SEND_INVALID_DEST)
  97                         SCDLog(LOG_DEBUG, CFSTR("notifyviaport(): %s"), mach_error_string(status));
  98                 (void) mach_port_destroy(mach_task_self(), *port);
  99                 *port = MACH_PORT_NULL;
 100                 (void) mach_port_destroy(mach_task_self(), sessionPrivate->server);
 101                 sessionPrivate->server = MACH_PORT_NULL;
 102                 return SCD_NOSERVER;
 103         }
 104
 105         /* set notifier active */
 106         sessionPrivate->notifyStatus = Using_NotifierInformViaMachPort;
 107
 108         return scd_status;
 109 }