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/**
* @file
*
* @brief Set Message Queue Attributes
* @ingroup POSIX_MQUEUE
*/
/*
* COPYRIGHT (c) 1989-2007.
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/posix/mqueueimpl.h>
int mq_setattr(
mqd_t mqdes,
const struct mq_attr *__restrict mqstat,
struct mq_attr *__restrict omqstat
)
{
POSIX_Message_queue_Control *the_mq;
Thread_queue_Context queue_context;
if ( mqstat == NULL ) {
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 );
}
_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 );
}
/*
* Return the old values.
*/
if ( omqstat != NULL ) {
omqstat->mq_flags = the_mq->oflag;
omqstat->mq_msgsize = the_mq->Message_queue.maximum_message_size;
omqstat->mq_maxmsg = the_mq->Message_queue.maximum_pending_messages;
omqstat->mq_curmsgs = the_mq->Message_queue.number_of_pending_messages;
}
the_mq->oflag = mqstat->mq_flags;
_CORE_message_queue_Release( &the_mq->Message_queue, &queue_context );
return 0;
}
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