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/*-*-c++-*-
* $Id$
*
* This file is part of plptools.
*
* Copyright (C) 1999 Philip Proudman <philip.proudman@btinternet.com>
* Copyright (C) 1999-2002 Fritz Elfert <felfert@to.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef _link_h_
#define _link_h_
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pthread.h>
#include <sys/time.h>
#include "bufferstore.h"
#include "bufferarray.h"
#include "Enum.h"
#include <vector>
#define LNK_DEBUG_LOG 4
#define LNK_DEBUG_DUMP 8
class ncp;
class packet;
/**
* Describes a transmitted packet which has not yet
* been acknowledged by the peer.
*/
typedef struct {
/**
* Original sequence number.
*/
int seq;
/**
* Number of remaining transmit retries.
*/
int txcount;
/**
* Time of last transmit.
*/
struct timeval stamp;
/**
* Packet content.
*/
bufferStore data;
} ackWaitQueueElement;
extern "C" {
static void *expire_check(void *);
}
class Link {
public:
enum link_type {
LINK_TYPE_UNKNOWN = 0,
LINK_TYPE_SIBO = 1,
LINK_TYPE_EPOC = 2,
};
/**
* Construct a new link instance.
*
* @param fname Name of serial device.
* @param baud Speed of serial device.
* @param ncp The calling ncp instance.
* @_verbose Verbosity (for debugging/troubleshooting)
*/
Link(const char *fname, int baud, ncp *_ncp, unsigned short _verbose = 0);
/**
* Disconnects from device and destroys instance.
*/
~Link();
/**
* Send a PLP packet to the Peer.
*
* @param buff The contents of the PLP packet.
*/
void send(const bufferStore &buff);
/**
* Query outstanding packets.
*
* @returns true, if packets are outstanding (not yet acknowledged), false
* otherwise.
*/
bool stuffToSend();
/**
* Query connection failure.
*
* @returns true, if the peer could not be contacted or did not response,
* false if everything is ok.
*/
bool hasFailed();
/**
* Reset connection and attempt to reconnect to the peer.
*/
void reset();
/**
* Wait, until all outstanding packets are acknowledged or timed out.
*/
void flush();
/**
* Purge all outstanding packets for a specified remote channel.
*
* @param channel The of the channel for which to remove outstanding
* packets.
*/
void purgeQueue(int channel);
/**
* Set verbosity of Link and underlying packet instance.
*
* @param _verbose Verbosity (a bitmapped value, see LINK_DEBUG_.. constants)
*/
void setVerbose(unsigned short _verbose);
/**
* Get current verbosity of Link.
*
* @returns The verbosity, specified at construction or last call to
* setVerbosity();
*/
unsigned short getVerbose();
/**
* Get the current link type.
*
* @returns One of LINK_TYPE_... values.
*/
Enum<link_type> getLinkType();
/**
* Get current speed of the serial device
*
* @returns The current speed in baud.
*/
int getSpeed();
private:
friend class packet;
friend void * expire_check(void *);
void receive(bufferStore buf);
void transmit(bufferStore buf);
void sendAck(int seq);
void sendReqReq();
void sendReqCon();
void sendReq();
void multiAck(struct timeval);
void retransmit();
void transmitHoldQueue(int channel);
void transmitWaitQueue();
void purgeAllQueues();
unsigned long retransTimeout();
pthread_t checkthread;
pthread_mutex_t queueMutex;
ncp *theNCP;
packet *p;
int txSequence;
int rxSequence;
int seqMask;
int maxOutstanding;
unsigned long conMagic;
unsigned short verbose;
bool failed;
Enum<link_type> linkType;
std::vector<ackWaitQueueElement> ackWaitQueue;
std::vector<bufferStore> holdQueue;
std::vector<bufferStore> waitQueue;
bool xoff[256];
};
#endif
/*
* Local variables:
* c-basic-offset: 4
* End:
*/
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