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/*
Copyright (C) 2000 Stefan Westerfeld
stefan@space.twc.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "tcpconnection.h"
#include "dispatcher.h"
#include "debug.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#define queue cqueue
#include <netdb.h>
#undef queue
#include <netinet/in.h>
#include <sys/un.h>
#include <errno.h>
#undef DEBUG_CONNECTION_DATA
using namespace Arts;
/*
* These parameters impact the performance significantly. There are two sides:
*
* when you use too large buffers for reading/writing
* - it may be, that each operation takes too long, so that for instance
* an important real time audio job drops during that time
* - it may be, that dealing with large buffers (allocation, cache, etc)
* itself causes a penalty
*
* on the other hand, small buffers lead to repeated operating system calls,
* which is bad especially if you even go through all the chain: check what
* can be written with select, invoke the corresponding object, actually
* read (or write), do messages, do timers, go sleep again on select.
*/
static const int MCOP_MAX_READ_SIZE=8192;
static const int MCOP_MAX_WRITE_SIZE=8192;
SocketConnection::SocketConnection()
{
}
SocketConnection::SocketConnection(int _fd)
: fd(_fd), _broken(false)
{
arts_debug("socketconnection created, fd = %d",fd);
Dispatcher::the()->ioManager()->watchFD(fd,
IOType::read|IOType::except|IOType::reentrant,this);
initReceive();
}
void SocketConnection::qSendBuffer(Buffer *buffer)
{
if(_broken)
{
// forget it ;) - no connection there any longer
delete buffer;
return;
}
if(pending.size() == 0)
{
// if there is nothing pending already, it may be that we are lucky
// and can write the buffer right now without blocking
writeBuffer(buffer);
if(!buffer->remaining())
{
delete buffer;
return;
}
// but if it blocks, we'll need to watch for write chances to send
// that buffer later
Dispatcher::the()->ioManager()->watchFD(fd,IOType::write|IOType::reentrant,this);
}
pending.push_back(buffer);
}
#ifdef DEBUG_CONNECTION_DATA
static void connection_hex_dump(unsigned char *buffer, long len)
{
int i = 0;
printf("Connection: received %ld bytes:\n\n",len);
while (i < len)
{
unsigned int j, n, d[16];
for (n = 0; n < 16; n++)
if (i < len)
d[n] = buffer[i++];
else
break;
printf (" ");
for (j = 0; j < n; j++) printf ("%s %02x", j == 8 ? " " : "", d[j]);
for (; j < 16; j++) printf ("%s ", j == 8 ? " " : "");
printf (" ");
for (j = 0; j < n; j++)
printf ("%c", d[j] >= 32 ? d[j] : '.');
printf ("\n");
}
}
#endif
void SocketConnection::notifyIO(int _fd, int types)
{
assert(_fd == fd);
if(types & IOType::read)
{
unsigned char buffer[MCOP_MAX_READ_SIZE];
long n = read(fd,buffer,MCOP_MAX_READ_SIZE);
#ifdef DEBUG_CONNECTION_DATA
connection_hex_dump(buffer,n);
#endif
if(n > 0)
{
receive(buffer,n);
// warning: the object may not exist any more here!
return;
}
else if(n == 0 /* remote end closed connection */
|| (n == -1 && errno != EAGAIN && errno != EINTR)) /* some error */
{
close(fd);
_broken = true;
Dispatcher::the()->ioManager()->remove(this,IOType::all);
Dispatcher::the()->handleConnectionClose(this);
// warning: the object may not exist any more here!
return;
}
}
if(types & IOType::write)
{
assert(pending.size() != 0);
Buffer *pbuffer = *pending.begin();
if(pbuffer->remaining()) writeBuffer(pbuffer);
// no else => it could have been sent in the if(..remaining..) above
if(!pbuffer->remaining())
{
delete pbuffer;
pending.pop_front();
if(pending.size() == 0)
Dispatcher::the()->ioManager()->remove(this,IOType::write);
}
}
if(types & IOType::except)
{
assert(false);
}
}
void SocketConnection::writeBuffer(Buffer *buffer)
{
long len = MCOP_MAX_WRITE_SIZE;
if(buffer->remaining() < len) len = buffer->remaining();
void *data = buffer->peek(len);
long written = write(fd,data,len);
if(written > 0)
buffer->skip(len);
}
bool SocketConnection::broken()
{
return _broken;
}
void SocketConnection::drop()
{
if(!_broken)
{
close(fd);
_broken = true;
Dispatcher::the()->ioManager()->remove(this,IOType::all);
}
}
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