forked from Imagelibrary/rtems
98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup POSIXAPI
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*
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* @brief Message Queue Attributes
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*/
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/*
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* NOTE: The structure of the routines is identical to that of POSIX
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* Message_queues to leave the option of having unnamed message
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* queues at a future date. They are currently not part of the
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* POSIX standard but unnamed message_queues are. This is also
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* the reason for the apparently unnecessary tracking of
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* the process_shared attribute. [In addition to the fact that
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* it would be trivial to add pshared to the mq_attr structure
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* and have process private message queues.]
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*
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* This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open
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* time.
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*
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* COPYRIGHT (c) 1989-2011.
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* On-Line Applications Research Corporation (OAR).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/posix/mqueueimpl.h>
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/*
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* 15.2.8 Get Message Queue Attributes, P1003.1b-1993, p. 283
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*/
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int mq_getattr(
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mqd_t mqdes,
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struct mq_attr *mqstat
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)
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{
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POSIX_Message_queue_Control *the_mq;
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Thread_queue_Context queue_context;
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if ( mqstat == NULL ) {
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rtems_set_errno_and_return_minus_one( EINVAL );
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}
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the_mq = _POSIX_Message_queue_Get( mqdes, &queue_context );
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if ( the_mq == NULL ) {
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rtems_set_errno_and_return_minus_one( EBADF );
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}
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_CORE_message_queue_Acquire_critical(
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&the_mq->Message_queue,
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&queue_context
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);
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if ( the_mq->open_count == 0 ) {
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_CORE_message_queue_Release( &the_mq->Message_queue, &queue_context );
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rtems_set_errno_and_return_minus_one( EBADF );
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}
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/*
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* Return the old values.
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*/
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mqstat->mq_flags = the_mq->oflag;
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mqstat->mq_msgsize = the_mq->Message_queue.maximum_message_size;
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mqstat->mq_maxmsg = the_mq->Message_queue.maximum_pending_messages;
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mqstat->mq_curmsgs = the_mq->Message_queue.number_of_pending_messages;
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_CORE_message_queue_Release( &the_mq->Message_queue, &queue_context );
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return 0;
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}
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