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118 lines
4.3 KiB
118 lines
4.3 KiB
/************************************************************************ |
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* libc/mqueue/mq_setattr.c |
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* |
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* Copyright (C) 2007, 2009, 2011 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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* Definitions |
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************************************************************************/ |
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/************************************************************************ |
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* Private Type Declarations |
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************************************************************************/ |
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/************************************************************************ |
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* Global Variables |
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************************************************************************/ |
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/************************************************************************ |
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* Private Variables |
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************************************************************************/ |
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/************************************************************************ |
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* Private Functions |
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************************************************************************/ |
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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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