id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
4787	ASIO - adding support for accessing UDP control headers	anonymous	chris_kohlhoff	"Attached patch implements ASIO support for accessing optional UDP control headers such as the timestamp information set with SO_TIMESTAMP.

Here are two ways of getting timestamp information using the new feature of the patch.  Note that it works in synchronous and asynchronous mode.

ip::udp::socket sock;
...
sock.set_option(ip::unicast::timestamp(true));
...
ip::udp::endpoint ep;
sock.receive_from(buf, ep, bytes_transferred);

boost::asio::detail::io_control::siocgstamp tv1;

for (const cmsghdr* cmsg = ep.control_header_first();
     cmsg;
    cmsg = ep.control_header_next(cmsg)) {
    printf(""   cmsg_len %zu: "", cmsg->cmsg_len);
    switch (cmsg->cmsg_level) {
        case SOL_SOCKET:
            switch (cmsg->cmsg_type) {
                case SO_TIMESTAMP: {
                    const timeval *stamp =
                        ep.control_msg_data<const timeval*>(cmsg);
                    printf(""SO_TIMESTAMP %ld.%06ld"",
                        (long)stamp->tv_sec,
                        (long)stamp->tv_usec);
                    tv1.set(*stamp);
                    break;
                }
                case SO_TIMESTAMPNS: {
                    const timespec* stamp =
                        ep.control_msg_data<const timespec*>(cmsg);
                    ...
                    break;
                }
                default:
                    printf(""type %d"", cmsg->cmsg_type);
                    break;
                }
                break;
            }
        default:
            printf(""Level %d, Type %d"", cmsg->cmsg_level,
                cmsg->cmsg_type);
            break;
    }
}

// Alternative way of getting the last datagram's kernel timestamp
boost::asio::detail::io_control::siocgstamp tv;
boost::system::error_code ec;
boost::asio::detail::socket_ops::state_type client_state = 0;
boost::asio::detail::socket_ops::ioctl(
    a_sock.native(), client_state, tv.name(), tv.data(), ec);

Hope it can be included in the release.

Regards,

Serge"	Patches	new	To Be Determined	asio	Boost 1.44.0	Problem			saleyn@… leon@…