Re: [dwm] patch to not reparent children to init

On (06/11/08 09:53), Neale Pickett wrote:
> To: dwm mail list <dwm_AT_suckless.org>
> From: Neale Pickett <neale_AT_woozle.org>
> Subject: Re: [dwm] patch to not reparent children to init
> User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux)
> Reply-To: dwm mail list <dwm_AT_suckless.org>
> List-Id: dwm mail list <dwm.suckless.org>
>
> "Donald Chai" <donald.chai_AT_gmail.com> writes:
>
> > On Tue, Nov 4, 2008 at 9:09 AM, Neale Pickett <neale_AT_woozle.org> wrote:
> >> Reparenting everything to init with the double-fork is a nightmare on a
> >> many-user machine, especially when I'm logged in more than once. pstree
> >> becomes useless. This sets up a SIGCHLD handler and only forks once.
> >> Adds 2 SLOC, but surely there's some reason the double-fork is there that
> >> I'm just missing...
> >
> > If you quit dwm, what happens to any programs that you've launched?
>
> Nothing, the setsid() call makes children process group leaders so they
> don't receive any of the signals the parent gets.
>
> > What happens if you suddenly decide to manage all your windows with a
> > different window manager?
>
> Suddenly all my windows have title bars, there are background menus, and
> I find myself using the mouse a lot ;)
>
> Given that dwm doesn't come with a facility to launch a new wm, I'm not
> terribly worried about either of these cases. But here's a function to
> restart dwm or change to a new wm (why would you want to do that?!),
> anyway, so you can try it out for yourself and see what happens:
>
> void
> restart(const Arg *arg)
> {
> if (arg->v) {
> execvp(((char **)arg->v[0]), (char **)arg->v);
> } else {
> execlp("dwm", "dwm", NULL);
> }
> }
>
> In all seriousness, the only thing this changes for me is making the
> output of pstree useful. When there are 20 X sessions on the machine
> and I need to kill a stuck firefox, having useful pstree output is super
> handy. If everything's a child of init, the output is flat, and I have
> to pull out my hair. Nobody wants that, least of all my head.
>
> Neale
>

pkill -u $USER firefox

that's all, no searching pstree etc etc. :)

-- 
Premysl "Anydot" Hruby, http://www.redrum.cz/