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
36 static inline mach_port_t
_mig_get_reply_port()37 _mig_get_reply_port()
38 {
39 return (mach_port_t)(uintptr_t)_os_tsd_get_direct(__TSD_MIG_REPLY);
40 }
41
42 static inline void
_mig_set_reply_port(mach_port_t port)43 _mig_set_reply_port(mach_port_t port)
44 {
45 _os_tsd_set_direct(__TSD_MIG_REPLY, (void *)(uintptr_t)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 */
54 mach_port_t
mig_get_reply_port(void)55 mig_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 */
69 void
mig_dealloc_reply_port(mach_port_t migport)70 mig_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
88 void
mig_put_reply_port(mach_port_t reply_port __unused)89 mig_put_reply_port(mach_port_t reply_port __unused)
90 {
91 }
92