dispatch-1.0/src/shims/mach.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 #if HAVE_MACH
  24 void *
  25 dispatch_mach_msg_get_context(mach_msg_header_t *msg)
  26 {
  27         mach_msg_context_trailer_t *tp;
  28         void *context = NULL;
  29
  30         tp = (mach_msg_context_trailer_t *)((uint8_t *)msg + round_msg(msg->msgh_size));
  31         if (tp->msgh_trailer_size >= (mach_msg_size_t)sizeof(mach_msg_context_trailer_t)) {
  32                 context = (void *)(uintptr_t)tp->msgh_context;
  33         }
  34
  35         return context;
  36 }
  37
  38 #ifndef DISPATCH_NO_LEGACY
  39 /*
  40  * Raw Mach message support
  41  */
  42 boolean_t
  43 _dispatch_machport_callback(mach_msg_header_t *msg, mach_msg_header_t *reply,
  44   void (*callback)(mach_msg_header_t *))
  45 {
  46         mig_reply_setup(msg, reply);
  47         ((mig_reply_error_t*)reply)->RetCode = MIG_NO_REPLY;
  48
  49         callback(msg);
  50
  51         return TRUE;
  52 }
  53
  54 /*
  55  * CFMachPort compatibility
  56  */
  57 boolean_t
  58 _dispatch_CFMachPortCallBack(mach_msg_header_t *msg, mach_msg_header_t *reply,
  59   void (*callback)(struct __CFMachPort *, void *msg, signed long size, void *))
  60 {
  61         mig_reply_setup(msg, reply);
  62         ((mig_reply_error_t*)reply)->RetCode = MIG_NO_REPLY;
  63
  64         callback(NULL, msg, msg->msgh_size, dispatch_mach_msg_get_context(msg));
  65
  66         return TRUE;
  67 }
  68 #endif
  69 #endif /* HAVE_MACH */