Re: [RFC] sigsetjmp/siglongjmp on cygwin

[Keith Seitz <keiths at cygnus dot com>]

On Mon, 13 Aug 2001, Andrew Cagney wrote:

> > Would love to do this, but, unfortunately, writing a simple test to do
> > this is not so easy. The problem is that sigsetjmp/siglongjmp are, for
> > lack of a better phrase, "flakey". Ever simple testcase I come up with
> > works just fine, but I can get gdb to crash instantly...
>
>
> Yes, I think that is what every one is stumped on.  Making it more
> difficult, a compile time rather than a runtime test is probably needed
> - otherwize it won't be possible to canadian cross GDB.
>
> Perhaphs the real problem is GDB corrupting its stack?  Can you explain
> the test case or is it just ``normal use''?

It's easy to reproduce once you have gdb built with sigsetjmp/siglongjmp.
Just boot Win98 and run gdb. Do something, ANYTHING to call
return_to_top_level. I did "info func" on gdb. When the pager was done
outputting the first page of functions, I asked it to "quit" instead of
continuing the listing. Boom! It died immediately.

Of course, the bigger problem for me is that Insight causes gdb to call
return_to_top_level all the darn time, so Insight crashes immediately. :-(

Keith