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

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

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

--- Comment #1 from Josh Stone <jistone at redhat dot com> 2011-08-17 00:40:56 UTC ---
Created attachment 5902
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5902
Add a --remote unix:/path target

The new code is the class unix_stapsh, which is pretty straightforward.  The
rest is fixing broken assumptions: get_reply() now skips over dbug messages in
case stderr is joined, and handle_poll() has to deal with fdin == fdout.

I haven't tried anything virtualized yet, but this appears to do the trick for
simple local sockets.  In one terminal, perhaps in a loop:
  socat UNIX-LISTEN:/tmp/foo EXEC:'stapsh -vvv'

The -v flags are at your discretion.  As is, this will keep all stderr local,
but you can use "EXEC:'stapsh -vvv',stderr" to send that over the socket too.

In another terminal:
  stap --remote unix:/tmp/foo ...

et voila!

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