Support for sendmsg/recvmsg

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Hi,

I wanted to ask if it would be possible to support sendmsg and recvmsg calls through io_uring via the Rio interface? I would like to use io_uring for UDP, which is quite bleeding edge: Ubuntu 20.04 comes with Kernel 5.4, which supports the aforementioned methods, but not the plain send / recv calls that rio currently uses (see here). Hence, implementing the sendmsg/recvmsg would significantly ease adoption for me.

I would also volunteer contributing this feature if you agree.

Thanks!

Martin