Re: Problems debugging forked processes

[Daniel Jacobowitz <drow at mvista dot com>]

On Sun, Apr 21, 2002 at 09:12:33AM +0300, Eli Zaretskii wrote:
> 
> On Fri, 19 Apr 2002, Daniel Jacobowitz wrote:
> 
> > > (gdb) show follow-fork-mode
> > > Debugger response to a program call of fork or vfork is "parent".
> > > (gdb) set follow-fork-mode child
> > > (gdb) show follow-fork-mode
> > > Debugger response to a program call of fork or vfork is "child".
> > 
> > This variable doesn't actually affect GNU/Linux.  Yeah, I know, I know. 
> > We need a documentation patch to address this; please file a PR
> > (http://sources.redhat.com/gdb/, Bugs).
> 
> If someone tells me what should be documented, I'll do that.  Now is the 
> time, since v5.2 is in pretest.
> 
> Is the issue that follow-fork-mode is only supported on a small number of 
> systems?  If so, what are those systems, and is it enough to have their 
> list in the manual?

I believe the only platform to implement this is actually HP/UX:

drow@nevyn:/opt/src/gdb/src/gdb% grep -r CHILD_HAS_FORKED .
./inftarg.c:#if !defined(CHILD_HAS_FORKED)
./config/pa/nm-hppah.h:#define CHILD_HAS_FORKED
./infttrace.c:#if defined(CHILD_HAS_FORKED)
./ChangeLog-1998:       (child_has_forked): Now enclosed by a CHILD_HAS_FORKED ifdef


There's a nice new debugging interface in the works for GNU/Linux that
will let us support this some day.  But for now, HP/UX only.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer