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I'm trying to integrate D-Bus with my boost::asio application. D-Bus has an API that enumerates a set of Unix file descriptors (mainly sockets but could also be FIFOs) to be watched. When those descriptors have something to be read I should inform the D-Bus API so it can read them and do it's thing. Currently I'm doing this: using boost::asio::posix::stream_descriptor; void read_handle(stream_descriptor* desc, const boost::system::error_code& ec, std::size_t bytes_read) { if (!ec) { stream_descriptor::bytes_readable command(true); descriptor->io_control(command); std::size_t bytes_readable = command.get(); std::cout << "It thinks I should read" << bytes_readable << " bytes" << std::endl; } else { std::cout << "There was an error" << std::endl; } } void watch_descriptor(boost::asio::io_service& ios, int file_descriptor) { // Create the asio representation of the descriptor stream_descriptor* desc = new stream_descriptor(ios); desc->assign(file_descriptor); // Try to read 0 bytes just to be informed that there is something to be read std::vector<char> buffer(0); desc->async_read_some(boost::asio::buffer(buffer, 0), boost::bind(read_handle, desc, _1, _2)); } But the handler is called right away saying that it has 0 bytes to be read. I would like it to be called only when there is something to be read, but boost::asio CAN NOT read it. It should act just as a glorified select() . Is there a simple way to do that? PS: I'm extensively using boost::asio in my software, this is just a small part of it, so I would like not to depend on glib or other mainloops.

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