Date: Wed, 29 Oct 2008 06:59:37 -0700 From: David Wolfskill <david@catwhisker.org> To: Ed Schouten <ed@80386.nl> Cc: current@freebsd.org Subject: Re: Apparent "permissions" issue with /dev/cuau0? Message-ID: <20081029135937.GV69155@bunrab.catwhisker.org> In-Reply-To: <20081029055913.GE1165@hoeg.nl> References: <20081029050917.GQ69155@bunrab.catwhisker.org> <20081029055913.GE1165@hoeg.nl>
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On Wed, Oct 29, 2008 at 06:59:13AM +0100, Ed Schouten wrote:
> ...
> > .if ${OSVERSION} < 600000
> > GPSMAN_DEFAULT_PORT?=3D /dev/cuaa0
> > .elif ${OSVERSION} < 800045
> > GPSMAN_DEFAULT_PORT?=3D /dev/cuad0
> > .else
> > GPSMAN_DEFAULT_PORT?=3D /dev/cuau0
> > .endif
>=20
> Yes. That seems to be okay. I think you could already remove the cuaa0
> entry, because I'm not sure if we support RELENG_5 anyway?
Not sure; it doesn't hurt to leave it in for now, so I'm not fussed
about it. :-}
> ...
> > I suppose I could try using ktrace(1) to get a better idea what's going
> > on. Any other (better?) ideas?
>=20
> I think the best thing to try is to see what the error code is the
> open() call on the TTY returned. EPERM is possible, but it's more likely
> you got an ENXIO or EBUSY. You could add printf's to sys/kern/tty.c's
> ttydev_open() to see where it falls through.
It was EBUSY. And seeing that reminded me that when I run CURRENT on my
laptop, I have it configured to use the serial port (singular) as a
console. And I have getty(8) listening on it so I can login to the
laptop even for those times when the keyboard becomes unresponsive....
Running "conscontrol delete cuau0" addressed the first issue; whacking
/etc/ttys & sending init(8) a SIGHUP addressed the second.
Those done, GPSMan was able to use the serial port as intended.
Sorry for the noise/false alarm/foot-shooting. :-}
> Another life saving tool is pstat(8). It gives you a list of TTY's on
> the system. The `STATE' column should reveal some of the flags that are
> currently set in the TTY, which is useful when looking through
> ttydev_open(). You could also run `show all ttys' in DDB and use `show
> tty <addr>' to dump all state of the TTY in question.
Ah; thanks.
> Please let me know if you discover any new issues/run into any problems.
> Thanks!
All clear! :-)
(And it appears that Tcl isn't at fault, either. :-})
Peace,
david
--=20
David H. Wolfskill david@catwhisker.org
Depriving a girl or boy of an opportunity for education is evil.
See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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