ruck@reef.cis.ufl.edu (John Ruckstuhl) (05/30/91)
My first attempt at writing a simple lpr filter has failed, so I ask for
a correction to my point-of-view, or a pointer to a reference.
We run SunOS 4.1.1 on SPARCs.
We currently lpr to an HP PaintJet without any lpr-filtering (ie, the
simple printcap entry has no filters, not even "if" or "of" defined).
I'd like to prefix and postfix each printjob with an escape sequence, so
I modified the printcap to include
:if=/usr/local/lib/paintjet/if:of=/usr/local/lib/paintjet/of:
and wrote the simple if
#! /usr/bin/sh
/usr/5bin/echo '\033E\033&/6A\033%1BIN;WU0;PW0.01;\c'
cat
and simple of
#! /usr/bin/sh
cat
/usr/5bin/echo 'PG;\c'
and made the files executable.
Then, I restarted the lpr daemon (by entering lpc, and restarting all)
As I said, this did not work for me. Please recommend my next step.
Do lpr filters I/O with specially named files instead of stdin and
stdout as I've assumed?
Thank you for your time and help.
Best regards,
ruck.
--
John R Ruckstuhl, Jr ruck@alpha.ee.ufl.edu
Dept of Electrical Engineering ruck@cis.ufl.edu, uflorida!ruck
University of Florida ruck%sphere@cis.ufl.edu, sphere!ruckruck@reef.cis.ufl.edu (John Ruckstuhl) (05/31/91)
In article <28820@uflorida.cis.ufl.EDU> I writes: >My first attempt at writing a simple lpr filter has failed, so I ask for >a correction to my point-of-view, or a pointer to a reference. > >I'd like to prefix and postfix each printjob with an escape sequence, so >I modified the printcap to include > :if=/usr/local/lib/paintjet/if:of=/usr/local/lib/paintjet/of: As J Greely <jgreely@cis.ohio-state.edu> and jeffe@eniac.seas.upenn.edu (george) have kindly informed me: The solution is to define the prefix and postfix in the "if", and forget about the "of". "of" is not what I assumed it was. #! /usr/bin/sh /usr/5bin/echo '\033E\033&/6A\033%1BIN;WU0;PW0.01;\c' cat /usr/5bin/echo 'PG;\c' Thank you to J & george, and to others whose replies and followups are already on the way. Best regards, ruck -- John R Ruckstuhl, Jr ruck@alpha.ee.ufl.edu Dept of Electrical Engineering ruck@cis.ufl.edu, uflorida!ruck University of Florida ruck%sphere@cis.ufl.edu, sphere!ruck
perl@dwrsun2.UUCP (Robert Perlberg) (06/21/91)
In writing an lpd filter for an HP LaserJet, I discovered something
important. It may not be necessary on all systems, but it sure was on
mine (SunOS 3.5 at the time).
I had a problem with handshaking not working and sometimes small jobs
just wouldn't print at all. I discovered that the problem was that
since my filter exits as soon as it finishes writing to the serial
port, the port had not been flushed. Apparently, when you close a
serial port before all of the data in the output queue has been
physically transmitted it can cause the driver to stop doing
handshaking, or to throw away the rest of the output queue. I solved
the problem by making sure in the filter that the serial port output
queue was empty before exiting. Here is the code I used for this:
#include <sgtty.h>
...
int outchars;
...
fflush(stdout);
while(ioctl(fileno(stdout), TIOCOUTQ, &outchars) == 0 && outchars > 0)
{
sleep(1);
}
Robert Perlberg
Dean Witter Reynolds Inc., New York
murphy!dwrsun2!perl
-- "I am not a language ... I am a free man!"