Re: Readiness notification exemplars

From: Serge E. Hallyn <>
Date: Sat, 4 Apr 2020 17:18:11 -0500

On Sat, Apr 04, 2020 at 09:29:04PM +0000, Laurent Bercot wrote:
> > Yes it sounds like I completely misread the earlier emails, sorry about
> > that. Now, looking at,
> > I'm probably not reading that quite right, but it seems to tie the
> > proposal to the 'notifcation-fd' file in the service directory, making
> > it a bit less general.
> The notification-fd file is for s6-supervise, i.e. s6's implementation
> of a supervisor. It is meant to make the fd number configurable on the
> supervisor side, to allow daemons to use whatever fd they choose.
> On the daemon side, you can use any option you like to tell the daemon
> what fd it should write to. It has nothing to do with s6, and I have no
> recommended policy for daemons.
> > s6-log however uses the -d argument to pass the
> > fd, so I'll go with that.
> -d works for s6-log and a few others of my programs. For others, -d
> is already used for something else, so I use another option.
> I really suggest you don't try to standardize a way to tell daemons
> what fd to use. No method will be universal, there will always be
> some obscure daemon that will conflict with it.

Right, I didn't mean -d specifically :) I just meant pass the fd# as
a command line argument.

Received on Sat Apr 04 2020 - 22:18:11 UTC

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