libsyscall/mach/mig_reply_port.c

   1 /*
   2  * Copyright (c) 2010 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include <mach/mach.h>
  30 #include <mach/mach_init.h>
  31
  32 //extern mach_port_t _pthread_reply_port(pthread_t);
  33 static mach_port_t _task_reply_port = MACH_PORT_NULL;
  34
  35 extern mach_port_t _mig_get_reply_port(void);
  36 extern void _mig_set_reply_port(mach_port_t port);
  37
  38 /*
  39  * Called by mach_init with 0 before cthread_init is
  40  * called and again with 1 at the end of cthread_init.
  41  */
  42 void
  43 _mig_init(int init_done)
  44 {
  45         if (init_done == 0) {
  46                 _task_reply_port = mach_reply_port();
  47         }
  48 }
  49
  50 /*
  51  * Called by mig interface code whenever a reply port is needed.
  52  * Tracing is masked during this call; otherwise, a call to printf()
  53  * can result in a call to malloc() which eventually reenters
  54  * mig_get_reply_port() and deadlocks.
  55  */
  56 mach_port_t
  57 mig_get_reply_port(void)
  58 {
  59         register mach_port_t port = _mig_get_reply_port();
  60         if (port == MACH_PORT_NULL) {
  61                 port = mach_reply_port();
  62                 _mig_set_reply_port(port);
  63         }
  64         return port;
  65 }
  66
  67 /*
  68  * Called by mig interface code after a timeout on the reply port.
  69  * May also be called by user. The new mig calls with port passed in.
  70  */
  71 void
  72 mig_dealloc_reply_port(mach_port_t migport)
  73 {
  74         register mach_port_t port;
  75
  76         port = _mig_get_reply_port();
  77         if (port != MACH_PORT_NULL && port != _task_reply_port) {
  78                 _mig_set_reply_port(_task_reply_port);
  79                 (void) mach_port_mod_refs(mach_task_self(), port, MACH_PORT_RIGHT_RECEIVE, -1);
  80                 if (migport != port) {
  81                         (void) mach_port_deallocate(mach_task_self(), migport);
  82                 }
  83                 _mig_set_reply_port(MACH_PORT_NULL);
  84         }
  85 }
  86
  87 /*************************************************************
  88  *  Called by mig interfaces after each RPC.
  89  *  Could be called by user.
  90  ***********************************************************/
  91
  92 void
  93 mig_put_reply_port(mach_port_t reply_port)
  94 {
  95 }