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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup POSIX_MQUEUE
*
* @brief Notify Process that a Message is Available on a Queue
*/
/*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/posix/mqueueimpl.h>
#include <signal.h>
static void _POSIX_Message_queue_Notify_handler(
CORE_message_queue_Control *the_message_queue,
Thread_queue_Context *queue_context
)
{
POSIX_Message_queue_Control *the_mq;
int signo;
the_mq = RTEMS_CONTAINER_OF(
the_message_queue,
POSIX_Message_queue_Control,
Message_queue
);
signo = the_mq->notification.sigev_signo;
_CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL );
_CORE_message_queue_Release( &the_mq->Message_queue, queue_context );
kill( getpid(), signo );
}
int mq_notify(
mqd_t mqdes,
const struct sigevent *notification
)
{
POSIX_Message_queue_Control *the_mq;
Thread_queue_Context queue_context;
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 );
}
if ( notification != NULL ) {
if ( _CORE_message_queue_Is_notify_enabled( &the_mq->Message_queue ) ) {
_CORE_message_queue_Release( &the_mq->Message_queue, &queue_context );
rtems_set_errno_and_return_minus_one( EBUSY );
}
the_mq->notification = *notification;
_CORE_message_queue_Set_notify(
&the_mq->Message_queue,
_POSIX_Message_queue_Notify_handler
);
} else {
_CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL );
}
_CORE_message_queue_Release( &the_mq->Message_queue, &queue_context );
return 0;
}
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