Subject: Re: CVS commit: src/sys/dev/wscons
To: Julio M. Merino Vidal <>
From: Christos Zoulas <>
List: source-changes
Date: 02/10/2006 13:31:58
On Feb 10,  6:41pm, ("Julio M. Merino Vidal") wrote:
-- Subject: Re: CVS commit: src/sys/dev/wscons

| On Friday 10 February 2006 18:33, Christos Zoulas wrote:
| > Module Name:	src
| > Committed By:	christos
| > Date:		Fri Feb 10 17:33:02 UTC 2006
| >
| > Modified Files:
| > 	src/sys/dev/wscons: wsmouse.c
| >
| > Log Message:
| > PR/32794: Paul Shupak: Panic in wsmouse code.
| > Checking the number of events after you've trashed the stack is not very
| > useful. Instead, break out of the loop if we ran out, printing a message.
| Maybe there should be assertions just before each attempt to modify
| events[nevents] to ensure that nevents is low enough.

I think it is fine for the non-loop cases (because it is obvious that
they fit).

| But... given the way the events vector is sized (to which you added a
| comment), in which situation can it overflow?

Well, we'll find out soon enough I guess. The logic is complicated with
the repeat button mix.

| > Also don't try to inject 0 events; reset our state instead. Maybe having
| Theorically the input function is called when there is, at least, an event
| to process (this is stated in a comment at the beginning of the function).
| Therefore, nevents == 0 cannot happen, isn't it?

Then we should change it to print a diagnostic if DEBUG or DIAGNOSTIC is set.