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readmessage.c
/*====================================================================*
*
* Copyright (c) 2013 Qualcomm Atheros, Inc.
*
* All rights reserved.
*
*====================================================================*/
/*====================================================================*
*
* ssize_t readmessage (struct channel const * channel, struct message * message, 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 packet length on success,
* 0 on timeout or -1 on error;
*
* see sendmessage for the send counterpart to this function;
*
* a well designed UnwantedMessage function is critical here;
*
* Contributor(s):
* Charles Maier
* Nathaniel Houghton
*
*--------------------------------------------------------------------*/
#ifndef READMESSAGE_SOURCE
#define READMESSAGE_SOURCE
#include
#include
#include
#include "../tools/error.h"
#include "../tools/timer.h"
#include "../plc/plc.h"
ssize_t readmessage (struct channel const * channel, struct message * message, uint8_t MMV, uint16_t MMTYPE)
{
struct timeval ts;
struct timeval tc;
ssize_t length;
if (gettimeofday (& ts, NULL) == - 1)
{
error (1, errno, CANT_START_TIMER);
}
while ((length = readpacket (channel, message, sizeof (* message))) >= 0)
{
if (! UnwantedMessage (message, length, MMV, MMTYPE))
{
return (length);
}
if (gettimeofday (& tc, NULL) == - 1)
{
error (1, errno, CANT_RESET_TIMER);
}
if (channel->timeout < 0)
{
continue;
}
if (channel->timeout > MILLISECONDS (ts, tc))
{
continue;
}
return (0);
}
return (- 1);
}
#endif
*
* Copyright (c) 2013 Qualcomm Atheros, Inc.
*
* All rights reserved.
*
*====================================================================*/
/*====================================================================*
*
* ssize_t readmessage (struct channel const * channel, struct message * message, 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 packet length on success,
* 0 on timeout or -1 on error;
*
* see sendmessage for the send counterpart to this function;
*
* a well designed UnwantedMessage function is critical here;
*
* Contributor(s):
* Charles Maier
* Nathaniel Houghton
*
*--------------------------------------------------------------------*/
#ifndef READMESSAGE_SOURCE
#define READMESSAGE_SOURCE
#include
#include
#include
#include "../tools/error.h"
#include "../tools/timer.h"
#include "../plc/plc.h"
ssize_t readmessage (struct channel const * channel, struct message * message, uint8_t MMV, uint16_t MMTYPE)
{
struct timeval ts;
struct timeval tc;
ssize_t length;
if (gettimeofday (& ts, NULL) == - 1)
{
error (1, errno, CANT_START_TIMER);
}
while ((length = readpacket (channel, message, sizeof (* message))) >= 0)
{
if (! UnwantedMessage (message, length, MMV, MMTYPE))
{
return (length);
}
if (gettimeofday (& tc, NULL) == - 1)
{
error (1, errno, CANT_RESET_TIMER);
}
if (channel->timeout < 0)
{
continue;
}
if (channel->timeout > MILLISECONDS (ts, tc))
{
continue;
}
return (0);
}
return (- 1);
}
#endif