src/shims.c

   1 /*
   2  * Copyright (c) 2008-2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_APACHE_LICENSE_HEADER_START@
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  * @APPLE_APACHE_LICENSE_HEADER_END@
  19  */
  20
  21 #include "internal.h"
  22
  23 void *
  24 dispatch_mach_msg_get_context(mach_msg_header_t *msg)
  25 {
  26         mach_msg_context_trailer_t *tp;
  27         void *context = NULL;
  28
  29         tp = (mach_msg_context_trailer_t *)((uint8_t *)msg + round_msg(msg->msgh_size));
  30         if (tp->msgh_trailer_size >= (mach_msg_size_t)sizeof(mach_msg_context_trailer_t)) {
  31                 context = (void *)(uintptr_t)tp->msgh_context;
  32         }
  33
  34         return context;
  35 }
  36
  37 /*
  38  * Raw Mach message support
  39  */
  40 boolean_t
  41 _dispatch_machport_callback(mach_msg_header_t *msg, mach_msg_header_t *reply,
  42   void (*callback)(mach_msg_header_t *))
  43 {
  44         mig_reply_setup(msg, reply);
  45         ((mig_reply_error_t*)reply)->RetCode = MIG_NO_REPLY;
  46
  47         callback(msg);
  48
  49         return TRUE;
  50 }
  51
  52 /*
  53  * CFMachPort compatibility
  54  */
  55 boolean_t
  56 _dispatch_CFMachPortCallBack(mach_msg_header_t *msg, mach_msg_header_t *reply,
  57   void (*callback)(struct __CFMachPort *, void *msg, signed long size, void *))
  58 {
  59         mig_reply_setup(msg, reply);
  60         ((mig_reply_error_t*)reply)->RetCode = MIG_NO_REPLY;
  61
  62         callback(NULL, msg, msg->msgh_size, dispatch_mach_msg_get_context(msg));
  63
  64         return TRUE;
  65 }