ASIO - adding support for accessing UDP control headers

[anonymous]

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

[saleyn@…]

Support of optional datagram control headers.

[saleyn@…]

Implementation of timestamp supporting socket options.

[saleyn@…]

Please use this patch instead - apparently when I ported the patch from 1.41.0 to 1.44.0 I previously missed to add support for non_blocking mode in 1.44.0.

[jason@…]

Is there a problem with the patch? I ask because it's still not in the release and is 3 years old.

Jason

[jason@…]

Updated patch for boost 1.53.0

[jason@…]

Improvement to previous patch for 1.53.0. These patches change the existing interfaces by adding additional parameters.

[pdurkan@…]

Is this patch working?

[jason@…]

It worked for me. However, we no longer use the related code so I'm unlikely to track this patch much more.

Regards, Jason

[saleyn@…]

Worked fine for me in 1.44.0. Haven't used that code since that version.

[rpopescu@…]

Hello,

Why isn't this applied? We also would like support for SO_BUSY_POLL.

Thank you!