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/**
* @file
*
* @brief POSIX Message Queue and Send Support
* @ingroup POSIXAPI
*/
/*
* 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.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/posix/mqueueimpl.h>
#include <fcntl.h>
int _POSIX_Message_queue_Send_support(
mqd_t mqdes,
const char *msg_ptr,
size_t msg_len,
unsigned int msg_prio,
bool wait,
Watchdog_Interval timeout
)
{
POSIX_Message_queue_Control *the_mq;
Thread_queue_Context queue_context;
Status_Control status;
bool do_wait;
Thread_Control *executing;
/*
* 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 = _POSIX_Message_queue_Get( mqdes, &queue_context );
if ( the_mq == NULL ) {
rtems_set_errno_and_return_minus_one( EBADF );
}
if ( ( the_mq->oflag & O_ACCMODE ) == O_RDONLY ) {
_ISR_lock_ISR_enable( &queue_context.Lock_context.Lock_context );
rtems_set_errno_and_return_minus_one( EBADF );
}
/*
* A timed receive with a bad time will do a poll regardless.
*/
if ( wait ) {
do_wait = ( the_mq->oflag & O_NONBLOCK ) == 0;
} else {
do_wait = wait;
}
_CORE_message_queue_Acquire_critical(
&the_mq->Message_queue,
&queue_context
);
if ( the_mq->open_count == 0 ) {
_CORE_message_queue_Release( &the_mq->Message_queue, &queue_context );
rtems_set_errno_and_return_minus_one( EBADF );
}
/*
* Now perform the actual message receive
*/
executing = _Thread_Executing;
_Thread_queue_Context_set_relative_timeout( &queue_context, timeout );
status = _CORE_message_queue_Submit(
&the_mq->Message_queue,
executing,
msg_ptr,
msg_len,
_POSIX_Message_queue_Priority_to_core( msg_prio ),
do_wait,
&queue_context
);
return _POSIX_Zero_or_minus_one_plus_errno( status );
}
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