Re: How to start a service when a device is created under /dev/pts/

[Giuseppe Sacco <giuseppe@xxxxxxxxx>]

Il giorno lun, 13/02/2023 alle 15.25 +0200, Mantas Mikulėnas ha scritto:
> On Mon, Feb 13, 2023 at 3:21 PM Giuseppe Sacco <giuseppe@xxxxxxxxx>
> wrote:
> > [...]
> > In this scenario, the ptys are created by software like iaxmodem
> > (that uses
> > asterisk) when its daemon starts. Some more information is available at
> > Debian bug 1031200 (http://bugs.debian.org/1031200) and a suggested
> > solution is to change the unit and depend on the pty daemon service and
> > on
> > the a file system link in /dev that points to the real device in
> > /dev/pty/
> > (the link being created by the pty service at startup time).
> > 
> > Something like:
> > 
> > [Unit]
> > Description=HylaFAX faxgetty %I
> > Wants=iaxmodem.service dev-%i.device
> 
> I can't see how that would work. Udev doesn't issue events for symlinks –
> a symlink to something that's not a "device" is still not a device.

Yes, that's my point of view too. That's way I am asking here.

> Would it be enough to order faxgetty After=iaxmodem.service, i.e. wait
> until it has created *all* of the ptys that it was set up to create? Are
> they preconfigured or do they show up dynamically?

I don't know. I am going to check.

Thank you,
Giuseppe