summaryrefslogtreecommitdiffstats
path: root/cpukit/posix/src/mqueuesendsupp.c
blob: 5fda0f1fe55f15cabaca20b6370b903884a0a0c4 (plain)
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
130
131
132
/*
 *  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) 1989-2008.
 *  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.
 *
 *  $Id$
 */

#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_Send_support
 */

int _POSIX_Message_queue_Send_support(
  mqd_t               mqdes,
  const char         *msg_ptr,
  size_t              msg_len,
  uint32_t            msg_prio,
  bool                wait,
  Watchdog_Interval   timeout
)
{
  POSIX_Message_queue_Control    *the_mq;
  POSIX_Message_queue_Control_fd *the_mq_fd;
  Objects_Locations               location;
  CORE_message_queue_Status       msg_status;
  bool                            do_wait;

  /*
   * Validate the priority.
   * XXX - Do not validate msg_prio is not less than 0.
   */

  if ( msg_prio > MQ_PRIO_MAX )
    rtems_set_errno_and_return_minus_one( EINVAL );

  the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location );
  switch ( location ) {

    case OBJECTS_LOCAL:
      if ( (the_mq_fd->oflag & O_ACCMODE) == O_RDONLY ) {
        _Thread_Enable_dispatch();
        rtems_set_errno_and_return_minus_one( EBADF );
      }

      the_mq = the_mq_fd->Queue;

      /*
       *  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
       */
      msg_status = _CORE_message_queue_Submit(
        &the_mq->Message_queue,
        (void *)msg_ptr,
        msg_len,
        mqdes,      /* mqd_t is an object id */
        NULL,
        _POSIX_Message_queue_Priority_to_core( msg_prio ),
        do_wait,
        timeout    /* no timeout */
      );

      _Thread_Enable_dispatch();

      /*
       *  If we had to block, then this is where the task returns
       *  after it wakes up.  The returned status is correct for
       *  non-blocking operations but if we blocked, then we need
       *  to look at the status in our TCB.
       */

      if ( msg_status == CORE_MESSAGE_QUEUE_STATUS_UNSATISFIED_WAIT )
        msg_status = _Thread_Executing->Wait.return_code;

      if ( !msg_status )
        return msg_status;

      rtems_set_errno_and_return_minus_one(
        _POSIX_Message_queue_Translate_core_message_queue_return_code(
          msg_status
        )
      );

#if defined(RTEMS_MULTIPROCESSING)
    case OBJECTS_REMOTE:
#endif
    case OBJECTS_ERROR:
      break;
  }

  rtems_set_errno_and_return_minus_one( EBADF );
}