bin/57630: lptcontrol gives "device busy" if device turned off

Bruce Evans bde at
Mon Oct 6 02:10:18 PDT 2003

The following reply was made to PR bin/57630; it has been noted by GNATS.

From: Bruce Evans <bde at>
To: "Klaus-J.Wolf" <yanestra at>
Cc: FreeBSD-gnats-submit at, freebsd-bugs at
Subject: Re: bin/57630: lptcontrol gives "device busy" if device turned off
Date: Mon, 6 Oct 2003 19:02:03 +1000 (EST)

 On Mon, 6 Oct 2003, Klaus-J.Wolf wrote:
 > >Description:
 > "lptcontrol -ei -d /dev/lpt0" during boot time fails with "device busy"
 > if the printer is turned off at that time.
 lptcontrol should be run on the control device (not /dev/lptN).
 Support for using the control device automatically was broken in
 rev.1.8 of lptcontrol.c.
 Existence of the documented control device was broken in FreeBSD-5
 as part of devfs lossage.  The documented control device is "/dev/lpctlN"
 (see lptcontrol(8), but devfs creates "/dev/lptN.ctl".
 The lpt driver also has support for control bits in the minor number.
 (The control device is a special case of this -- it uses bit 0x80.)
 There are 6 control bits, giving a total of 64 possible devices per
 unit.  devfs only creates 2 of these.

More information about the freebsd-bugs mailing list