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/* -*- c++ -*- */
/*
* Copyright 2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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 3, or (at your option)
* any later version.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <ciso646>
#include <gr_stream_pdu_base.h>
#include <gr_io_signature.h>
#include <cstdio>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdexcept>
#include <string.h>
#include <iostream>
#include <gr_pdu.h>
#include <boost/asio.hpp>
#include <boost/format.hpp>
#ifdef HAVE_IO_H
#include <io.h>
#endif
static const long timeout_us = 100*1000; //100ms
gr_stream_pdu_base::gr_stream_pdu_base (int MTU)
: gr_sync_block("stream_pdu_base",
gr_make_io_signature(0, 0, 0),
gr_make_io_signature(0, 0, 0)),
d_finished(false), d_started(false), d_fd(-1)
{
// reserve space for rx buffer
d_rxbuf.resize(MTU,0);
}
gr_stream_pdu_base::~gr_stream_pdu_base()
{
stop_rxthread();
}
void gr_stream_pdu_base::stop_rxthread(){
d_finished = true;
if(d_started){
d_thread->interrupt();
d_thread->join();
}
}
void gr_stream_pdu_base::start_rxthread(pmt::pmt_t _rxport){
rxport = _rxport;
d_thread = boost::shared_ptr<boost::thread>(new boost::thread(boost::bind(&gr_stream_pdu_base::run, this)));
d_started = true;
}
void gr_stream_pdu_base::run(){
while(!d_finished) {
if(not wait_ready()){ continue; }
const int result = read( d_fd, &d_rxbuf[0], d_rxbuf.size() );
if(result <= 0){ throw std::runtime_error("gr_stream_pdu_base, bad socket read!"); }
pmt::pmt_t vector = pmt::pmt_init_u8vector(result, &d_rxbuf[0]);
pmt::pmt_t pdu = pmt::pmt_cons( pmt::PMT_NIL, vector);
message_port_pub(rxport, pdu);
}
}
void gr_stream_pdu_base::send(pmt::pmt_t msg){
pmt::pmt_t vector = pmt::pmt_cdr(msg);
size_t offset(0);
size_t itemsize(gr_pdu_itemsize(type_from_pmt(vector)));
int len( pmt::pmt_length(vector)*itemsize );
const int rv = write(d_fd, pmt::pmt_uniform_vector_elements(vector, offset), len);
if(rv != len){
std::cerr << boost::format("WARNING: gr_stream_pdu_base::send(pdu) write failed! (d_fd=%d, len=%d, rv=%d)")
% d_fd % len % rv << std::endl;
}
}
int
gr_stream_pdu_base::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
throw std::runtime_error("should not be called.\n");
return 0;
}
bool gr_stream_pdu_base::wait_ready(){
//setup timeval for timeout
timeval tv;
tv.tv_sec = 0;
tv.tv_usec = timeout_us;
//setup rset for timeout
fd_set rset;
FD_ZERO(&rset);
FD_SET(d_fd, &rset);
//call select with timeout on receive socket
return ::select(d_fd+1, &rset, NULL, NULL, &tv) > 0;
}
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