[Bug runtime/13078] investigate qemu virtio-serial channel for talking to stap-sh

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13078

--- Comment #5 from Frank Ch. Eigler <fche at redhat dot com> ---
Further to the compatibility angle, consider too that even with (future)
stap 2.4 + stapsh 2.4, we don't want to have to use the stdout/stderr
multiplexing mode for transports such as ssh, which handle stdout/stderr
for us separately and well already.

So we could have that stapsh -d option (renamed --stdio or --persistent
or --multiplex?) modify the handshake so that stapsh identifies itself as
"stapsh-d VERSION ...." to stap, at which point they both go into the
explicitly-multiplexed mode.

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