1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/*
* NOTE: The structure of the routines is identical to that of POSIX
* Message_queues to leave the option of having unnamed message
* queues at a future date. They are currently not part of the
* POSIX standard but unnamed message_queues are. This is also
* the reason for the apparently unnecessary tracking of
* the process_shared attribute. [In addition to the fact that
* it would be trivial to add pshared to the mq_attr structure
* and have process private message queues.]
*
* This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open
* time.
*
* COPYRIGHT (c) 1989-2011.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdarg.h>
#include <pthread.h>
#include <limits.h>
#include <errno.h>
#include <fcntl.h>
#include <mqueue.h>
#include <rtems/system.h>
#include <rtems/score/watchdog.h>
#include <rtems/seterr.h>
#include <rtems/posix/mqueue.h>
#include <rtems/posix/time.h>
/*
* _POSIX_Message_queue_Receive_support
*
* NOTE: XXX Document how size, priority, length, and the buffer go
* through the layers.
*/
ssize_t _POSIX_Message_queue_Receive_support(
mqd_t mqdes,
char *msg_ptr,
size_t msg_len,
unsigned int *msg_prio,
bool wait,
Watchdog_Interval timeout
)
{
POSIX_Message_queue_Control *the_mq;
POSIX_Message_queue_Control_fd *the_mq_fd;
Objects_Locations location;
size_t length_out;
bool do_wait;
the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location );
switch ( location ) {
case OBJECTS_LOCAL:
if ( (the_mq_fd->oflag & O_ACCMODE) == O_WRONLY ) {
_Thread_Enable_dispatch();
rtems_set_errno_and_return_minus_one( EBADF );
}
the_mq = the_mq_fd->Queue;
if ( msg_len < the_mq->Message_queue.maximum_message_size ) {
_Thread_Enable_dispatch();
rtems_set_errno_and_return_minus_one( EMSGSIZE );
}
/*
* Now if something goes wrong, we return a "length" of -1
* to indicate an error.
*/
length_out = -1;
/*
* A timed receive with a bad time will do a poll regardless.
*/
if ( wait )
do_wait = (the_mq_fd->oflag & O_NONBLOCK) ? false : true;
else
do_wait = wait;
/*
* Now perform the actual message receive
*/
_CORE_message_queue_Seize(
&the_mq->Message_queue,
mqdes,
msg_ptr,
&length_out,
do_wait,
timeout
);
_Thread_Enable_dispatch();
if (msg_prio) {
*msg_prio = _POSIX_Message_queue_Priority_from_core(
_Thread_Executing->Wait.count
);
}
if ( !_Thread_Executing->Wait.return_code )
return length_out;
rtems_set_errno_and_return_minus_one(
_POSIX_Message_queue_Translate_core_message_queue_return_code(
_Thread_Executing->Wait.return_code
)
);
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE:
#endif
case OBJECTS_ERROR:
break;
}
rtems_set_errno_and_return_minus_one( EBADF );
}
|
