Re: [Chicken-hackers] [PATCH] catch "serious" signals SIGSEGV, SIGBUS, etc.

[Peter Bex]

On Sat, Oct 27, 2012 at 10:24:09AM -0400, Felix wrote:
> The attached patch adds signal handling for the "serious" signals
> mentioned above. This is quite useful, since it makes it possible
> to generate a call-trace on errors that would normally just abort
> the process. In "csi", the REPL will be reentered.
> 
> Setting user-level signal handlers for these signals is not allowed,
> as they the runtime-system needs to do some special processing for
> these, but the exceptions thrown as a result of the signals can be
> caught with the normal exception-handling procedures.
> 
> Recursive invocations of the signal handler (which would mean
> something is seriously broken, like an inconsistent heap) will still
> abort the process (this is also required to avoid having to siglongjmp
> out of the recursive handler, which is undefined according to
> POSIX).
> 
> The runtime option "-:S" can be used to disable setting up handlers
> for these signals.Ã
> 
> THe patch also adds "signal/bus", which was missing from the
> "posix" unit.

Cool, thanks.  I've pushed it.

Cheers,
Peter
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