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- /****************************************************************************
- * sched/mqueue/mq_setattr.c
- *
- * Copyright (C) 2007, 2009, 2011, 2015 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * 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.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <fcntl.h> /* O_NONBLOCK */
- #include <mqueue.h>
- #include <nuttx/mqueue.h>
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: mq_setattr
- *
- * Description:
- * This function sets the attributes associated with the
- * specified message queue "mqdes." Only the "O_NONBLOCK"
- * bit of the "mq_flags" can be changed.
- *
- * If "oldstat" is non-null, mq_setattr() will store the
- * previous message queue attributes at that location (just
- * as would have been returned by mq_getattr()).
- *
- * Input Parameters:
- * mqdes - Message queue descriptor
- * mq_stat - New attributes
- * oldstate - Old attributes
- *
- * Returned Value:
- * 0 (OK) if attributes are set successfully, otherwise
- * -1 (ERROR).
- *
- * Assumptions:
- *
- ****************************************************************************/
- int mq_setattr(mqd_t mqdes, const struct mq_attr *mq_stat,
- struct mq_attr *oldstat)
- {
- int ret = ERROR;
- if (mqdes && mq_stat)
- {
- /* Return the attributes if so requested */
- if (oldstat)
- {
- (void)mq_getattr(mqdes, oldstat);
- }
- /* Set the new value of the O_NONBLOCK flag. */
- mqdes->oflags = ((mq_stat->mq_flags & O_NONBLOCK) |
- (mqdes->oflags & (~O_NONBLOCK)));
- ret = OK;
- }
- return ret;
- }
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