posix/src/mqueuesetattr.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIX_MQUEUE
0007  *
0008  * @brief Set Message Queue Attributes
0009  */
0010
0011 /*
0012  *  COPYRIGHT (c) 1989-2007.
0013  *  On-Line Applications Research Corporation (OAR).
0014  *
0015  * Redistribution and use in source and binary forms, with or without
0016  * modification, are permitted provided that the following conditions
0017  * are met:
0018  * 1. Redistributions of source code must retain the above copyright
0019  *    notice, this list of conditions and the following disclaimer.
0020  * 2. Redistributions in binary form must reproduce the above copyright
0021  *    notice, this list of conditions and the following disclaimer in the
0022  *    documentation and/or other materials provided with the distribution.
0023  *
0024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0027  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0028  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0029  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0030  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0031  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0032  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0033  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0034  * POSSIBILITY OF SUCH DAMAGE.
0035  */
0036
0037 #ifdef HAVE_CONFIG_H
0038 #include "config.h"
0039 #endif
0040
0041 #include <rtems/posix/mqueueimpl.h>
0042
0043 int mq_setattr(
0044   mqd_t                 mqdes,
0045   const struct mq_attr *__restrict mqstat,
0046   struct mq_attr       *__restrict omqstat
0047 )
0048 {
0049   POSIX_Message_queue_Control *the_mq;
0050   Thread_queue_Context         queue_context;
0051
0052   if ( mqstat == NULL ) {
0053     rtems_set_errno_and_return_minus_one( EINVAL );
0054   }
0055
0056   the_mq = _POSIX_Message_queue_Get( mqdes, &queue_context );
0057
0058   if ( the_mq == NULL ) {
0059     rtems_set_errno_and_return_minus_one( EBADF );
0060   }
0061
0062   _CORE_message_queue_Acquire_critical(
0063     &the_mq->Message_queue,
0064     &queue_context
0065   );
0066
0067   if ( the_mq->open_count == 0 ) {
0068     _CORE_message_queue_Release( &the_mq->Message_queue, &queue_context );
0069     rtems_set_errno_and_return_minus_one( EBADF );
0070   }
0071
0072   /*
0073    *  Return the old values.
0074    */
0075
0076   if ( omqstat != NULL ) {
0077     omqstat->mq_flags   = the_mq->oflag;
0078     omqstat->mq_msgsize = the_mq->Message_queue.maximum_message_size;
0079     omqstat->mq_maxmsg  = the_mq->Message_queue.maximum_pending_messages;
0080     omqstat->mq_curmsgs = the_mq->Message_queue.number_of_pending_messages;
0081   }
0082
0083   the_mq->oflag = mqstat->mq_flags;
0084
0085   _CORE_message_queue_Release( &the_mq->Message_queue, &queue_context );
0086   return 0;
0087 }