On Sun, Jun 01, 2003 at 09:18:26PM +0100, Lusercop wrote:
> > > $SIG{CHLD} = sub { while (waitpid(-1,WNOHANG) > 0 ) { } };
> > If that's all you are doing, then is there anything wrong with
> > changing it to this?
> > $SIG{CHLD} = 'IGNORE';
>
> How is that even remotely the same? In the first case, you end up with no
> zombies, in the second case you end up with a load of them?
Hmm, unless I'm missing something, I'm agreeing with Toby. Brief testing
on 2.4.20 says that setting SIGCHILD to IGNORE will prevent zombies
appearing; I guess it's like vampies and garlic. The man page also
indicates that the expected behaviour is that no zombies appear.
Given the process ids are sequential in my little test program, it's not
Perl doing some daemonlike double-fork(), so I guess some special flag
gets set somewhere or something.. dunno ;) I didn't think this
behaviour existed either, but it seems to. Try it.
Cheers,
Alex.
