> From [EMAIL PROTECTED] Thu Jul 22 10:56:08 2004
> Date: Thu, 22 Jul 2004 19:55:45 +0200
> From: Mario Vanoni <[EMAIL PROTECTED]>
> To: Patrick Powell <[EMAIL PROTECTED]>
> CC: Patrick Powell <[EMAIL PROTECTED]>
> Subject: Re: LPRng: problem not mentioned in all docs, AFAIK
>
>
>
> Patrick Powell wrote:
> >>From [EMAIL PROTECTED] Sat Jul 10 09:18:50 2004
> >>Date: Sat, 10 Jul 2004 18:18:22 +0200
> >>From: Mario Vanoni <[EMAIL PROTECTED]>
> >>To: [EMAIL PROTECTED]
> >>Subject: LPRng: problem not mentioned in all docs, AFAIK
> >>
> >>- serial ports (Cyclades) with DEC vt510 screens
> >>
> >>- each vt510 has a parallel printer port connection
> >>
> >>- each vt510 has whith them his own printer
> >>
> >>- our print system imitates AT&T's lp(1) (ab)using
> >> the BSD-lpr, it works now since >6 years
> >> on the production machine with GNU/Linux SuSE 7.3
> >>
> >>- installed LPRng 3.7.4 from the SuSE DVD 7.3,
> >> works under parallel and (direct) serial ports
> >>
> >>- does'nt work for printers attached on vt510's,
> >> permission denied error on mails (user + tty!)
> >>
> >>- workaround, probably not secure and very _BAD_:
> >> on /etc/profile[.local on SuSE 7.3]
> >> we determine the attached port for the vt510's
> >> LPTTY=`tty`
> >> adding now for each type of line/terminal:
> >> chgrp lp ${LPTTY}
> >> all vt510 printers now works as usual
> >
> >
> > This is a well known problem with many (all?) Linux, *BSD, and other
> > systems that do dynamic device creation (loadable drivers) and when
the
> > /dev/XXX device entries are created dynamically.
> >
> > The problem is that there are no (few?) facilities to cause the
ownership
> > to be set 'correctly', as it usually defaults to 0600 (owned by
root).
> > Usually you have to
> >
> > a) do a modprobe to load the device driver. This is common
> > when you need a printer:
> > modprobe lp
>
> Impossible. Static compiled kernel, no modules allowed.
> And always the last stable from the 2.4 Linux branch.
>
> >
> > b) chown/chmod/chgrp the /dev/xxx entries.
> > chown lp:lp /dev/lp[0-9]*
> >
> > Under these conditions I usually modify the /etc/init.d/lprng.sh
> > startup script and add the entries there.
> >
> > Similar method works on *BSD systems, using the
/usr/local/etc/rc.d/lprng.sh
> > startup script and the *BSD module loading methods.
>
> Impossible. Production machine runs 24/7/36[56], nearly 99.999.
>
> Users do login/logout more times a day. Login resets the permissions
> on the /dev/ttyC## Cyclades/VT510 lines. Checked!
> Do chmod 0660 /dev/ttyC* then chgrp lp /dev/ttyC* say 06:00.
> Looks good, login and no printer working.
I suggest adding lp to the user's group:
Password:
lp:lpid:lpgroup:...
user1:user1id:user1group:...
Groups:
user1group:...:user1id,lpid
user2group:...:user2id,lpid
I assume that on open it sets the user and group on the device to
the user's UID and GID?
>
> Probably my solution is the only workaround,
> /etc/profile, executed by login with root permission,
> is able to change the permission.
>
>
> IMPORTANT QUESTION:
> Where is the limit of checkpc(8) for printcap entries?
> Now we have approx 400, due to our simulation of
> AT&T's lp(1) and his interface, and checkpc -f and
> checkpc -f -V (about the 50th entry)
> at some point freezes, after 30min Ctrl-C.
> With the new machines we will reach 1000 entries.
You can use:
checkpc -P printer
which only does the checks for the specified printer.
>
> Many thanks for your response and time.
>
> Mario Vanoni
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