Haven't tested it, but at first glance it looks correct.
So you don't think there's a need to implement service and all that,
like I did in my code?
Kyle
On Mon, 2015-03-16 at 12:27 +0100, svante karlsson wrote:
> Sorry for not replying earlier but I have not yet gotten any time to
> actually try it out on a raspberry.
>
>
> Hopefully tonight.... anyway - if the original code worked then the
> following "could" there is probably mistakes since I compiled this on
> windows and the ::open call in not working there...
>
>
>
>
> #include <fcntl.h>
> #include <iostream>
> #include <boost/bind.hpp>
> #include <boost/thread.hpp>
> #include <boost/asio.hpp>
> #include <boost/function.hpp>
>
> class gpio_interrupt
> {
> public:
> gpio_interrupt(boost::asio::io_service &ios,
> unsigned int number) :
> _socket(ios)
> {
> open(number);
> }
>
> ~gpio_interrupt()
> {
> close();
> }
>
> void open(unsigned int number)
> {
> boost::system::error_code ec;
> open(number, ec);
> boost::asio::detail::throw_error(ec, "open");
> }
>
> void open(unsigned int number,
> boost::system::error_code& ec)
> {
> std::ostringstream filename;
> filename << "/sys/class/gpio/gpio" << number
> << "/value";
>
> int fd = ::open(filename.str().c_str(),
> O_RDONLY | O_NONBLOCK);
> if (fd < 0)
> {
> ec = boost::system::error_code(errno,
> boost::asio::error::get_system_category());
> return;
> }
> _socket.assign(boost::asio::ip::udp::v4(), fd,
> ec);
> }
>
> void close()
> {
> boost::system::error_code ec;
> cancel(ec);
> boost::asio::detail::throw_error(ec, "close");
> }
>
> void close(boost::system::error_code& ec)
> {
> cancel(ec);
> }
>
> void cancel()
> {
> boost::system::error_code ec;
> _socket.cancel(ec);
> boost::asio::detail::throw_error(ec, "close");
> }
>
> void cancel(boost::system::error_code& ec)
> {
> _socket.cancel(ec);
> }
>
> void async_wait(boost::function<void(const
> boost::system::error_code& ec)> cb)
> {
>
> _socket.async_receive(boost::asio::null_buffers(),
> [cb](const boost::system::error_code& ec, std::size_t
> bytes_transferred)
> {
> cb(ec);
> });
> }
>
> private:
> boost::asio::ip::udp::socket _socket;
> };
>
>
> int main(int argc, char **argv)
> {
> boost::asio::io_service ios;
> boost::asio::io_service::work work(ios);
> boost::thread
> thread(boost::bind(&boost::asio::io_service::run,
> &ios));
>
> gpio_interrupt interrupt(ios, 21);
> interrupt.async_wait([](const
> boost::system::error_code& ec)
> {
> if (ec)
> {
> std::cout << ec.message() << std::endl;
> return;
> }
>
> std::cout << "Pin changed state" << std::endl;
> });
>
> while (true)
> {
>
> boost::this_thread::sleep(boost::posix_time::milliseconds(1000)); // just dummy - do something else here...
> }
>
> ios.stop();
> thread.join();
> return 0;
> }
>
>
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