source: rtems/cpukit/posix/src/mqueuerecvsupp.c @ 4dc89814

4.104.114.84.95
Last change on this file since 4dc89814 was 4dc89814, checked in by Joel Sherrill <joel.sherrill@…>, on Nov 2, 1999 at 5:00:35 PM

Split mqueue.c into a variety of files.

  • Property mode set to 100644
File size: 2.3 KB
Line 
1/*
2 *  NOTE:  The structure of the routines is identical to that of POSIX
3 *         Message_queues to leave the option of having unnamed message
4 *         queues at a future date.  They are currently not part of the
5 *         POSIX standard but unnamed message_queues are.  This is also
6 *         the reason for the apparently unnecessary tracking of
7 *         the process_shared attribute.  [In addition to the fact that
8 *         it would be trivial to add pshared to the mq_attr structure
9 *         and have process private message queues.]
10 *
11 *         This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open
12 *         time.
13 *
14 *  $Id$
15 */
16
17#include <stdarg.h>
18
19#include <pthread.h>
20#include <limits.h>
21#include <errno.h>
22#include <fcntl.h>
23#include <mqueue.h>
24
25#include <rtems/system.h>
26#include <rtems/score/watchdog.h>
27#include <rtems/posix/seterr.h>
28#include <rtems/posix/mqueue.h>
29#include <rtems/posix/time.h>
30
31/*PAGE
32 *
33 *  _POSIX_Message_queue_Receive_support
34 */
35 
36/* XXX be careful ... watch the size going through all the layers ... */
37
38ssize_t _POSIX_Message_queue_Receive_support(
39  mqd_t               mqdes,
40  char               *msg_ptr,
41  size_t              msg_len,
42  unsigned int       *msg_prio,
43  Watchdog_Interval   timeout
44)
45{
46  register POSIX_Message_queue_Control *the_mq;
47  Objects_Locations                     location;
48  unsigned32                            status = 0;
49  unsigned32                            length_out;
50 
51  the_mq = _POSIX_Message_queue_Get( mqdes, &location );
52  switch ( location ) {
53    case OBJECTS_ERROR:
54      set_errno_and_return_minus_one( EINVAL );
55    case OBJECTS_REMOTE:
56      _Thread_Dispatch();
57      return POSIX_MP_NOT_IMPLEMENTED();
58      set_errno_and_return_minus_one( EINVAL );
59    case OBJECTS_LOCAL:
60      /* XXX need to define the options argument to this */
61      length_out = msg_len;
62      _CORE_message_queue_Seize(
63        &the_mq->Message_queue,
64        mqdes,
65        msg_ptr,
66        &length_out,
67        /* msg_prio,    XXXX */
68        the_mq->blocking,
69        timeout
70      );
71      _Thread_Enable_dispatch();
72      if ( !status )
73        return length_out;
74      /* XXX --- the return codes gotta be looked at .. fix this */
75      return _Thread_Executing->Wait.return_code;
76  }
77  return POSIX_BOTTOM_REACHED();
78}
79
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