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			ReadMME.c
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/*====================================================================*
 *
 *   Copyright (c) 2013 Qualcomm Atheros, Inc.
 *
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or 
 *   without modification, are permitted (subject to the limitations 
 *   in the disclaimer below) provided that the following conditions 
 *   are met:
 *
 *   * Redistributions of source code must retain the above copyright 
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * 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.
 *
 *   * Neither the name of Qualcomm Atheros nor the names of 
 *     its contributors may be used to endorse or promote products 
 *     derived from this software without specific prior written 
 *     permission.
 *
 *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE 
 *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE 
 *   COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot; 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.  
 *
 *--------------------------------------------------------------------*/

/*====================================================================*
 *
 *   signed ReadMME (struct plc * plc, uint8_t MMV, uint16_t MMTYPE);
 *
 *   plc.h
 *
 *   wait for a QCA vendor specific message of given MMV and MMTYPE;
 *   discard unwanted messages until the desired message arrives or
 *   the channel timeout expires; return packetsize on success, 0 on
 *   timeout or -1 on error;
 *
 *   see SendMME for the send counterpart to this function;
 *
 *   a well designed UnwantedMessage function is critical here;
 *
 *
 *   Contributor(s):
 *      Charles Maier &lt;cmaier@qca.qualcomm.com&gt;
 *      Nathaniel Houghton &lt;nhoughto@qca.qualcomm.com&gt;
 *      Matthieu Poullet &lt;m.poullet@avm.de&gt;
 *
 *--------------------------------------------------------------------*/

#ifndef READMME_SOURCE
#define READMME_SOURCE

#include &lt;sys/time.h&gt;

#include &lt;stdint.h&gt;
#include &lt;memory.h&gt;
#include &lt;errno.h&gt;

#include &quot;../tools/error.h&quot;
#include &quot;../tools/timer.h&quot;
#include &quot;../plc/plc.h&quot;
#include &quot;../mme/mme.h&quot;

signed ReadMME (struct plc * plc, uint8_t MMV, uint16_t MMTYPE)

{
	struct channel * channel = (struct channel *)(plc-&gt;channel);
	struct message * message = (struct message *)(plc-&gt;message);
	struct timeval ts;
	struct timeval tc;
	if (gettimeofday (&amp;ts, NULL) == -1)
	{
		error (1, errno, CANT_START_TIMER);
	}
	while ((plc-&gt;packetsize = readpacket (channel, message, sizeof (* message))) &gt;= 0)
	{
		if (UnwantedMessage (message, plc-&gt;packetsize, MMV, MMTYPE))
		{
			if (gettimeofday (&amp;tc, NULL) == -1)
			{
				error (1, errno, CANT_RESET_TIMER);
			}
			if (channel-&gt;timeout &lt; 0)
			{
				continue;
			}
			if (channel-&gt;timeout &gt; MILLISECONDS (ts, tc))
			{
				continue;
			}
			plc-&gt;packetsize = 0;
		}
		break;
	}
	return (plc-&gt;packetsize);
}

#endif


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