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#include <sys/cdefs.h>
32#include "tsd.h"
33
34__XNU_PRIVATE_EXTERN mach_port_t _task_reply_port = MACH_PORT_NULL;
35
36static inline mach_port_t
37_mig_get_reply_port()
38{
39	return _os_tsd_get_direct(__TSD_MIG_REPLY);
40}
41
42static inline void
43_mig_set_reply_port(mach_port_t port)
44{
45	_os_tsd_set_direct(__TSD_MIG_REPLY, port);
46}
47
48/*
49 * Called by mig interface code whenever a reply port is needed.
50 * Tracing is masked during this call; otherwise, a call to printf()
51 * can result in a call to malloc() which eventually reenters
52 * mig_get_reply_port() and deadlocks.
53 */
54mach_port_t
55mig_get_reply_port(void)
56{
57	mach_port_t port = _mig_get_reply_port();
58	if (port == MACH_PORT_NULL) {
59		port = mach_reply_port();
60		_mig_set_reply_port(port);
61	}
62	return port;
63}
64
65/*
66 * Called by mig interface code after a timeout on the reply port.
67 * May also be called by user. The new mig calls with port passed in.
68 */
69void
70mig_dealloc_reply_port(mach_port_t migport)
71{
72	mach_port_t port = _mig_get_reply_port();
73	if (port != MACH_PORT_NULL && port != _task_reply_port) {
74		_mig_set_reply_port(_task_reply_port);
75		(void) mach_port_mod_refs(mach_task_self(), port, MACH_PORT_RIGHT_RECEIVE, -1);
76		if (migport != port) {
77			(void) mach_port_deallocate(mach_task_self(), migport);
78		}
79		_mig_set_reply_port(MACH_PORT_NULL);
80	}
81}
82
83/*************************************************************
84 *  Called by mig interfaces after each RPC.
85 *  Could be called by user.
86 ***********************************************************/
87
88void
89mig_put_reply_port(mach_port_t reply_port __unused)
90{
91}
92