On Wed, Jun 28, 2017 at 11:19:09AM +0200, Oliver Neukum wrote:
> Am Mittwoch, den 28.06.2017, 08:07 +1000 schrieb Stuart Longland:
>
> Hi,
>
> > >> and to select 4-wire ("full duplex") RS-485, one does:
> > >> # echo rs485fd > /sys/class/tty/ttyUSB0/standard
> > > This looks like something that people will put into udev.
> > > So the switch will be done via udev, but the user not necessarily
> > > started via udev. Looks like a race to me.
> >
> > It is a race, but unless a daemon is watching for the very moment that a
> > particular serial interface appears, it's one that init scripts are very
> > likely to win.
>
> That is precisely what a demon might do.
>
> > Short of having a flag that blocks reads/writes until a given sysfs file
> > is written to say "I'm ready, go ahead"… there aren't that many options
> > I can think of.
>
> 1) module option
No, just no, sorry.
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