hang on exit - bug or no bug?

Nicolas Williams Nicolas.Williams at ubsw.com
Sat Oct 6 01:06:01 EST 2001

I can certainly confirm, from experience, that, on Solaris,

rsh host command&

hangs if "command" keeps its stdio open. Rlogin is what others are
saying doesn't do this, but, so what?

As Lee Eakin explained yesterday, there's things SSH does that RLOGIN
doesn't, such as agent forwarding, X forwarding, port forwarding, all
of which may or may not be needed by that background command that's
still holding its stdio open.

And how's SSHD to know?

Perhaps there should be an option, that causes SSHD to exit when its
child exits and the session was a TTY session, and to hell with grand-
children's stdio. But the conservative behaviour needs to be available

This is all we're arguing about.


On Fri, Oct 05, 2001 at 02:18:00PM +0200, Markus Friedl wrote:
> On Thu, Oct 04, 2001 at 06:04:39PM -0500, mouring at etoh.eviladmin.org wrote:
> > If I know what I was looking for
> > I'd be happy to beg and borrow selective pieces of source code from
> > friends to investigate.  But I still am not dead sure what to look for.
> look for:
> 	what happens on SIGCHLD
> 	how to detect that there is no more data from the child

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