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192.168.1.100 / T106_DC / 758261d1c1850656b47c4c40486e4237bcd769a6 / . / ap / libc / glibc / glibc-2.23 / mach / msg.c
blob: bccad7fd26e6e1e8c60e14b469cb1ec899f60691 [file] [log] [blame]
lh9ed821d2023-04-07 01:36:19 -0700[diff] [blame]1/*
2 * Mach Operating System
3 * Copyright (c) 1991,1990,1989, 1995 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
25 */
26#include <mach/port.h>
27#include <mach/message.h>
28
29#ifdef MACH_MSG_OVERWRITE
30/* In variants with this feature, the actual system call is
31 __mach_msg_overwrite_trap. */
32mach_msg_return_t
33__mach_msg_trap (mach_msg_header_t *msg,
34 mach_msg_option_t option,
35 mach_msg_size_t send_size,
36 mach_msg_size_t rcv_size,
37 mach_port_t rcv_name,
38 mach_msg_timeout_t timeout,
39 mach_port_t notify)
40{
41 return __mach_msg_overwrite_trap (msg, option, send_size,
42 rcv_size, rcv_name, timeout, notify,
43 MACH_MSG_NULL, 0);
44}
45weak_alias (__mach_msg_trap, mach_msg_trap)
46
47/* See comments below in __mach_msg. */
48mach_msg_return_t
49__mach_msg_overwrite (mach_msg_header_t *msg,
50 mach_msg_option_t option,
51 mach_msg_size_t send_size,
52 mach_msg_size_t rcv_size,
53 mach_port_t rcv_name,
54 mach_msg_timeout_t timeout,
55 mach_port_t notify,
56 mach_msg_header_t *rcv_msg,
57 mach_msg_size_t rcv_msg_size)
58
59{
60 mach_msg_return_t ret;
61
62 /* Consider the following cases:
63 1. Errors in pseudo-receive (eg, MACH_SEND_INTERRUPTED
64 plus special bits).
65 2. Use of MACH_SEND_INTERRUPT/MACH_RCV_INTERRUPT options.
66 3. RPC calls with interruptions in one/both halves.
67 */
68
69 ret = __mach_msg_overwrite_trap (msg, option, send_size,
70 rcv_size, rcv_name, timeout, notify,
71 rcv_msg, rcv_msg_size);
72 if (ret == MACH_MSG_SUCCESS)
73 return MACH_MSG_SUCCESS;
74
75 if (!(option & MACH_SEND_INTERRUPT))
76 while (ret == MACH_SEND_INTERRUPTED)
77 ret = __mach_msg_overwrite_trap (msg, option, send_size,
78 rcv_size, rcv_name, timeout, notify,
79 rcv_msg, rcv_msg_size);
80
81 if (!(option & MACH_RCV_INTERRUPT))
82 while (ret == MACH_RCV_INTERRUPTED)
83 ret = __mach_msg_overwrite_trap (msg, option & ~MACH_SEND_MSG,
84 0, rcv_size, rcv_name, timeout, notify,
85 rcv_msg, rcv_msg_size);
86
87 return ret;
88}
89weak_alias (__mach_msg_overwrite, mach_msg_overwrite)
90#endif
91
92mach_msg_return_t
93__mach_msg (mach_msg_header_t *msg,
94 mach_msg_option_t option,
95 mach_msg_size_t send_size,
96 mach_msg_size_t rcv_size,
97 mach_port_t rcv_name,
98 mach_msg_timeout_t timeout,
99 mach_port_t notify)
100{
101 mach_msg_return_t ret;
102
103 /* Consider the following cases:
104 1. Errors in pseudo-receive (eg, MACH_SEND_INTERRUPTED
105 plus special bits).
106 2. Use of MACH_SEND_INTERRUPT/MACH_RCV_INTERRUPT options.
107 3. RPC calls with interruptions in one/both halves.
108 */
109
110 ret = __mach_msg_trap (msg, option, send_size,
111 rcv_size, rcv_name, timeout, notify);
112 if (ret == MACH_MSG_SUCCESS)
113 return MACH_MSG_SUCCESS;
114
115 if (!(option & MACH_SEND_INTERRUPT))
116 while (ret == MACH_SEND_INTERRUPTED)
117 ret = __mach_msg_trap (msg, option, send_size,
118 rcv_size, rcv_name, timeout, notify);
119
120 if (!(option & MACH_RCV_INTERRUPT))
121 while (ret == MACH_RCV_INTERRUPTED)
122 ret = __mach_msg_trap (msg, option & ~MACH_SEND_MSG,
123 0, rcv_size, rcv_name, timeout, notify);
124
125 return ret;
126}
127weak_alias (__mach_msg, mach_msg)
128
129mach_msg_return_t
130__mach_msg_send (mach_msg_header_t *msg)
131{
132 return __mach_msg (msg, MACH_SEND_MSG,
133 msg->msgh_size, 0, MACH_PORT_NULL,
134 MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
135}
136weak_alias (__mach_msg_send, mach_msg_send)
137
138mach_msg_return_t
139__mach_msg_receive (mach_msg_header_t *msg)
140{
141 return __mach_msg (msg, MACH_RCV_MSG,
142 0, msg->msgh_size, msg->msgh_local_port,
143 MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
144}
145weak_alias (__mach_msg_receive, mach_msg_receive)