John Baldwin wrote this message on Mon, Aug 25, 2014 at 13:35 -0400:
> On Monday, August 25, 2014 07:02:41 PM Mateusz Guzik wrote:
> > On Mon, Aug 25, 2014 at 10:23:19AM -0400, John Baldwin wrote:
> > > On Sunday, August 24, 2014 09:04:09 AM Mateusz Guzik wrote:
> > > > Author: mjg
> > > > Date: Sun Aug 24 09:04:09 2014
> > > > New Revision: 270444
> > > > URL: http://svnweb.freebsd.org/changeset/base/270444
> > > >
> > > > Log:
> > > > Fix getppid for traced processes.
> > > >
> > > > Traced processes always have the tracer set as the parent.
> > > > Utilize proc_realparent to obtain the right process when needed.
> > >
> > > Are you sure this won't break things? I know of several applications that
> > > expect a debugger to be the parent when attached and change behavior as a
> > > result (e.g. inserting a breakpoint on an assertion failure rather than
> > > generating a core).
> >
> > Well, this is what linux and solaris do.
>
> Interesting.
>
> > I don't feel strongly about this change. If you really want I'm happy to
> > revert.
>
> In general I'd like to someday have the debugger-debuggee relationship not
> override parent-child and this is a step in that direction. However, this
> will break existing applications, so this needs to be clearly documented in
> the release notes. In addition, we should probably advertise how a process
> can correctly determine if it is being run under a debugger (right now you
> can
> do 'getppid()' and use strcmp or strstr on the p_comm of that pid so you can
> do different things for "gdb" vs "gcore", etc. so just checking P_TRACED from
> kinfo_proc wouldn't be equivalent in functionality)
But what about when you attach gdb to a running process... That
doesn't magicly make the now debugged process a child of gdb does it?
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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