Hi, What do you think of extending asio with unix signal handling? The extension lets the library user to have a handler invoked when a unix signal arrives. void on_signal(boost::system::error_code const& error) { if (!error) cout << "sigint received" << endl; } int main(int argc, char const* argv[]) { boost::asio::io_service ios; boost::asio::posix::signal_handler<SIGINT> sigint(ios); while (true) { ios.reset(); sigint.async_wait(boost::bind(on_signal, _1)); ios.poll(); } } This lets the user have a unix signal handler of an arbitrary signature. This also removes the "async-signal safe calls" restriction. Please, find the implementation along with two examples enclosed. BR, Dmitry