1 /*
2  * Mach Operating System
3  * Copyright (c) 1991,1990,1989 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 /*
27  * HISTORY
28  * $Log:mach_msg.c,v $
29  * Revision 2.3  92/01/23  15:22:17  rpd
30  * Fixed to not pass MACH_SEND_INTERRUPT and MACH_RCV_INTERRUPT
31  * to the kernel.
32  * [92/01/20            rpd]
33  *
34  * Revision 2.2  92/01/15  17:17:13  rpd
35  * Created from msg.c.
36  * [92/01/15            rpd]
37  *
38  */
39 
40 #if defined(VGO_darwin)
41 
42 #include "pub_core_basics.h"
43 #include "pub_core_mach.h"
44 
45 #include <mach/port.h>
46 #include <mach/message.h>
47 
48 #define LIBMACH_OPTIONS (MACH_SEND_INTERRUPT|MACH_RCV_INTERRUPT)
49 
50 extern mach_msg_return_t
51 mach_msg_trap(mach_msg_header_t *msg,
52               mach_msg_option_t option,
53               mach_msg_size_t send_size,
54               mach_msg_size_t rcv_size,
55               mach_port_t rcv_name,
56               mach_msg_timeout_t timeout,
57               mach_port_t notify);
58 
59 mach_msg_return_t
60 mach_msg(msg, option, send_size, rcv_size, rcv_name, timeout, notify)
61     mach_msg_header_t *msg;
62     mach_msg_option_t option;
63     mach_msg_size_t send_size;
64     mach_msg_size_t rcv_size;
65     mach_port_t rcv_name;
66     mach_msg_timeout_t timeout;
67     mach_port_t notify;
68 {
69     mach_msg_return_t mr;
70 
71     /*
72      * Consider the following cases:
73      *1) Errors in pseudo-receive (eg, MACH_SEND_INTERRUPTED
74      *plus special bits).
75      *2) Use of MACH_SEND_INTERRUPT/MACH_RCV_INTERRUPT options.
76      *3) RPC calls with interruptions in one/both halves.
77      *
78      * We refrain from passing the option bits that we implement
79      * to the kernel.  This prevents their presence from inhibiting
80      * the kernel's fast paths (when it checks the option value).
81      */
82 
83     mr = mach_msg_trap(msg, option &~ LIBMACH_OPTIONS,
84                        send_size, rcv_size, rcv_name,
85                        timeout, notify);
86     if (mr == MACH_MSG_SUCCESS)
87         return MACH_MSG_SUCCESS;
88 
89     if ((option & MACH_SEND_INTERRUPT) == 0)
90         while (mr == MACH_SEND_INTERRUPTED)
91             mr = mach_msg_trap(msg,
92                                option &~ LIBMACH_OPTIONS,
93                                send_size, rcv_size, rcv_name,
94                                timeout, notify);
95 
96     if ((option & MACH_RCV_INTERRUPT) == 0)
97         while (mr == MACH_RCV_INTERRUPTED)
98             mr = mach_msg_trap(msg,
99                                option &~ (LIBMACH_OPTIONS|MACH_SEND_MSG),
100                                0, rcv_size, rcv_name,
101                                timeout, notify);
102 
103     return mr;
104 }
105 
106 #endif // defined(VGO_darwin)
107 
108 /*--------------------------------------------------------------------*/
109 /*--- end                                                          ---*/
110 /*--------------------------------------------------------------------*/
111