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Date: Wed, 3 Mar 2004 23:50:09 -0800 (PST)
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From: Bruce Evans <bde@zeta.org.au>
Subject: Re: bin/63718: lptcontrol.c has unused PATH_LPCTL definition.
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The following reply was made to PR bin/63718; it has been noted by GNATS.

From: Bruce Evans <bde@zeta.org.au>
To: "Gary W. Swearingen" <underway@comcast.net>
Cc: FreeBSD-gnats-submit@FreeBSD.org, freebsd-bugs@FreeBSD.org
Subject: Re: bin/63718: lptcontrol.c has unused PATH_LPCTL definition.
Date: Thu, 4 Mar 2004 18:42:28 +1100 (EST)

 On Wed, 3 Mar 2004, Gary W. Swearingen wrote:
 
 > >Description:
 >
 > lptcontrol.c has unused PATH_LPCTL definition.
 
 Not using it is the bug.  From lptcontrol(4):
 
 % ...
 %      -d device
 %              Set the mode of the printer device specified by device.  The
 %              default value for device is /dev/lpt0.
 
 The default should be the control device, but rev.1.7 of lptcontrol.c
 broke this.  The data device a completely bogus default for the control
 program.  Using it sometimes causes lptcontrol to hang or have undesirable
 side effects.  You can work around this by specifying the control device
 using -d and never using the default, but this shouldn't be necessary.
 
 % FILES
 %      /dev/lpt?               printer devices
 %      /dev/lpctl?             printer control devices
 
 The name of the control devices is documented here.  This is also
 broken in -current.  The device name has 1 spelling error and 2 lexical
 errors in devfs ("lpctl0" became "lpt0.ctl").
 
 Both MAKEDEV and devfs are missing support for the all but 2 of the 64
 mostly-undocumented subdevices per minor.  You can encode auto-linefeed
 and 5 other attributes in the minor number.  One of the attributes is
 LP_BYPASS, whose comment says that it is to bypass printer-ready checks
 but which actually encodes being a control device, so there are only 33
 useful subdevices per minor (32 data ones and 1 control one).  devfs
 only creates 2 of these.
 
 Bruce