/*

 *

 *  D-Bus++ - C++ bindings for D-Bus

 *

 *  Copyright (C) 2005-2007  Paolo Durante <shackan@gmail.com>

 *

 *

 *  This library is free software; you can redistribute it and/or

 *  modify it under the terms of the GNU Lesser General Public

 *  License as published by the Free Software Foundation; either

 *  version 2.1 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

 *  Lesser General Public License for more details.

 *

 *  You should have received a copy of the GNU Lesser General Public

 *  License along with this library; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

/* Project */

#include <dbus-c++/pipe.h>

#include <dbus-c++/util.h>

#include <dbus-c++/error.h>

/* STD */

#include <unistd.h>

#include <sys/poll.h>

#include <fcntl.h>

#include <errno.h>

#include <cassert>

using namespace DBus;

using namespace std;

Pipe::Pipe(void(*handler)(const void *data, void *buffer, unsigned int nbyte), const void *data) :

  _handler(handler),

  _fd_write(0),

  _fd_read(0),

  _data(data)

{

  int fd[2];

  if (pipe(fd) == 0)

  {

    _fd_read = fd[0];

    _fd_write = fd[1];

    fcntl(_fd_read, F_SETFL, O_NONBLOCK);

  }

  else

  {

    throw Error("PipeError:errno", toString(errno).c_str());

  }

}

void Pipe::write(const void *buffer, unsigned int nbytes)

{

  // TODO: ignoring return of read/write generates warning; maybe relevant for eventloop work...

  // first write the size into the pipe...

  ::write(_fd_write, static_cast <const void *>(&nbytes), sizeof(nbytes));

  // ...then write the real data

  ::write(_fd_write, buffer, nbytes);

}

ssize_t Pipe::read(void *buffer, unsigned int &nbytes)

{

  // TODO: ignoring return of read/write generates warning; maybe relevant for eventloop work...

  // first read the size from the pipe...

  ::read(_fd_read, &nbytes, sizeof(nbytes));

  //ssize_t size = 0;

  return ::read(_fd_read, buffer, nbytes);

}

void Pipe::signal()

{

  // TODO: ignoring return of read/write generates warning; maybe relevant for eventloop work...

  ::write(_fd_write, "", 1);

}