Re: [RFC PATCH] New SA_NOPRNOTIF sigaction flag

[Daniel Jacobowitz <dan@debian.org>]

On Wed, Sep 28, 2005 at 12:06:21PM -0600, Davda, Bhavesh P (Bhavesh) wrote:
> > Yes, I entirely understand what you're saying.  I feel like you're not
> > reading my responses.  GDB _already has a list of signals it does not
> > care about_.  If ptrace permitted, it could tell the kernel not to
> > context switch to deliver those signals.  In advance!  That's a
> > debugger-driven solution to your problem.
> > 
> > I'm not arguing out of theory here.  I've implemented this mechanism
> > before in other contexts, for instance to prevent the remote protocol
> > overhead for ignored signals when using gdb with gdbserver.
> > 
> 
> 
> Okay, I'll come up with an alternative patch that enhances the ptrace
> interface so the debugger can guide the kernel to NOT context switch and
> bother it about signal x from task y.
> 
> Would you be amenable to such a patch?

Yes, definitely.  I just hadn't found a chance to think about what the
interface should look like.

[For the record, I'm pretty sure that the Solaris procfs debug
interface offers a similar feature.]

-- 
Daniel Jacobowitz
CodeSourcery, LLC