msg_socket: introduce UnixSeqpacketExt

Occasionally, it is useful to be able to use UnixSeqpacket as a type
that can represent any kind of MsgSocket.  For example, to keep some
MsgSockets of different types in a Vec.  In this case, it may be known
what type of messages should be sent over a socket, even though that
may not be represantable in the type system.

To accomodate this situation, this patch introduces send_msg_on_socket
and recv_msg_on_socket methods on UnixSeqpacket, that can be used to
send or receive any kind of MsgOnSocket.  The caller is obviously
responsible for ensuring that the messages being sent are of the type
expected by the socket.

This lack of type safety for message types is not ideal, and so
MsgSender and MsgReceiver should still be preferred wherever possible.

Message-Id: <20200614114344.22642-2-hi@alyssa.is>

0 files changed, 0 insertions, 0 deletions