Re: just-in-time debugging?

[Sean Hunter <sean@dev.sportingbet.com>]

My approach is something like the others.  I developed a small wrapper to catch
unaligned traps on alpha.  What it does is run a program in gdb with some
specified arguments (it also sets up so that the process gets a SIGBUS when it
does an unaligned access, but that's probably not relevant here).

Any case, its available by anonymous ftp at ftp://uncarved.com/unaligned.c 
in case you're interested...

Sean

On Sat, Apr 28, 2001 at 09:17:10PM +0100, Tony Hoyle wrote:
> Is there a way (kernel or userspace... doesn't matter) that gdb/ddd
> could be invoked when a program is about
> to dump core, or perhaps on a certain signal (that the app could deliver
> to itself when required).  The latter case
> is what I need right now, as I have to debug an app that breaks
> seemingly randomly & I need to halt when
> certain assertions fail.  Core dumps aren't much use as you can't resume
> them, otherwise I'd just force a segfault
> or something.
> 
> I had a look at the do_coredump stuff and it looks like it could be
> altered to call gdb in the same way that
> modprobe gets called by kmod... however I don't sufficiently know the
> code to work out whether it'd work properly
> or not.  
> 
> A patch to glibc would perhaps be better, but I know that code even
> less!
> 
> Something like responding to SIGTRAP would probably be ideal.
> 
> Tony
> 
> -- 
> 
> "Two weeks before due date, the programmers work 22 hour days cobbling an
>  application from... (apparently) one programmer bashing his face into the
>  keyboard." -- Dilbert
> 
> tmh@magenta-netlogic.com                http://www.nothing-on.tv 
> 
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