Method CanSendReceive

src/network/core/tcp.cpp:194–212

* Check whether this socket can send or receive something. * @return \c true when there is something to receive. * @note Sets #writable if more data can be sent. */

 * @note Sets #writable if more data can be sent.
 */
bool NetworkTCPSocketHandler::CanSendReceive()
{
	assert(this->sock != INVALID_SOCKET);

	fd_set read_fd, write_fd;
	struct timeval tv;

	FD_ZERO(&read_fd);
	FD_ZERO(&write_fd);

	FD_SET(this->sock, &read_fd);
	FD_SET(this->sock, &write_fd);

	tv.tv_sec = tv.tv_usec = 0; // don't block at all.
	if (select(FD_SETSIZE, &read_fd, &write_fd, nullptr, &tv) < 0) return false;

	this->writable = !!FD_ISSET(this->sock, &write_fd);
	return FD_ISSET(this->sock, &read_fd) != 0;
}