79db432ab2
The varlink spec supports protocol upgrades and they are very useful to e.g. transfer binary data directly via varlink. So far sd-varlink was not supporting this. This commit adds a new public sd_varlink_call_and_upgrade() that sends a method call, waits for the reply, then steals the connection fds for raw I/O. It returns separate input_fd and output_fd to support both bidirectional sockets and pipe pairs. A helper is extracted and shared between sd_varlink_call_full() and sd_varlink_call_and_upgrade(). A new `protocol_upgrade` bool in `struct sd_varlink` ensures that on a protocol upgrade request we only exactly read the varlink protocol bytes and leave anything beyond that to the caller that speaks the upgraded protocol. Note that this is the client side of the library implementation only for now. The server side needs work but this is already useful as it allows to talk to varlink servers that speak protocol upgrades (like the rust implemenations of varlink).
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