5cb8226727
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5331 42af7a65-404d-4744-a932-0658087f49c3
119 lines
4.3 KiB
C
119 lines
4.3 KiB
C
/************************************************************************
|
|
* libc/mqueue/mq_setattr.c
|
|
*
|
|
* Copyright (C) 2007, 2009, 2011 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>
|
|
|
|
/************************************************************************
|
|
* Definitions
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Private Type Declarations
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Global Variables
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Private Variables
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Private Functions
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Public Functions
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Function: 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()).
|
|
*
|
|
* Parameters:
|
|
* mqdes - Message queue descriptor
|
|
* mq_stat - New attributes
|
|
* oldstate - Old attributes
|
|
*
|
|
* Return 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;
|
|
}
|