bug#6963: More usecases, patch attached

[Chong Yidong]

Juanma Barranquero <lekktu@gmail.com> writes:

> 1) The emacs server sends -error XXX, and closes the connection.
> emacsclient prints the error and exits.
> 2) The emacs server sends an unknown command; emacsclient prints an
> error and continues.
>
> With your patch, the case 2) would return EXIT_FAILURE (or the new
> exit code we discussed) even if subsequent commands are dealt with
> correctly.
>
> IIRC, receiving an unknown command from Emacs shouldn't be a fatal
> error; it can happen if you use an older emacsclient to connect to a
> more recent server.el with new functionality. Or should it?

I agree, the second case should not lead to EXIT_FAILURE.  I've checked
the patch, with this and a couple of other corrections, into the trunk.