RFC: implement "catch signal"

[Yao Qi]

On 11/17/2012 03:06 AM, Tom Tromey wrote:
> 	* breakpoint.c (base_breakpoint_ops): No longer static.
> 	(bpstat_explains_signal): New function.
> 	(init_catchpoint): No longer static.
> 	(base_breakpoint_explains_signal): New function.
> 	(base_breakpoint_ops): Initialize new field.
> 	* breakpoint.h (enum bpstat_signal_value): New.
> 	(struct breakpoint_ops) <explains_signal>: New field.
> 	(bpstat_explains_signal): Remove macro, declare as function.
> 	(base_breakpoint_ops, init_catchpoint): Declare.
> 	* break-catch-sig.c: New file.

FWIW, I am happy to see that some interfaces are exposed from 
breakpoint.c, and this new feature is implemented in a new file instead 
of in already-too-long breakpoint.c.

-- 
Yao (齐尧)