99 lines
3.4 KiB
C
99 lines
3.4 KiB
C
/************************************************************************
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* sched/mqueue/mq_setattr.c
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*
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* Copyright (C) 2007, 2009, 2011, 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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************************************************************************/
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/************************************************************************
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* Included Files
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************************************************************************/
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#include <nuttx/config.h>
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#include <fcntl.h> /* O_NONBLOCK */
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#include <mqueue.h>
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#include <nuttx/mqueue.h>
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/************************************************************************
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* Public Functions
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************************************************************************/
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/************************************************************************
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* Function: mq_setattr
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*
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* Description:
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* This function sets the attributes associated with the
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* specified message queue "mqdes." Only the "O_NONBLOCK"
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* bit of the "mq_flags" can be changed.
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*
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* If "oldstat" is non-null, mq_setattr() will store the
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* previous message queue attributes at that location (just
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* as would have been returned by mq_getattr()).
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*
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* Parameters:
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* mqdes - Message queue descriptor
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* mq_stat - New attributes
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* oldstate - Old attributes
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*
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* Return Value:
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* 0 (OK) if attributes are set successfully, otherwise
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* -1 (ERROR).
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*
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* Assumptions:
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*
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************************************************************************/
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int mq_setattr(mqd_t mqdes, const struct mq_attr *mq_stat,
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struct mq_attr *oldstat)
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{
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int ret = ERROR;
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if (mqdes && mq_stat)
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{
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/* Return the attributes if so requested */
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if (oldstat)
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{
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(void)mq_getattr(mqdes, oldstat);
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}
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/* Set the new value of the O_NONBLOCK flag. */
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mqdes->oflags = ((mq_stat->mq_flags & O_NONBLOCK) |
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(mqdes->oflags & (~O_NONBLOCK)));
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ret = OK;
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}
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return ret;
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}
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