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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Printing filter question
Date: 21 Oct 1995 11:36:28 +0100
Organization: Private FreeBSD site, Dresden.
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Message-ID: <46aifc$g8g@uriah.heep.sax.de>
References: <45qn2o$irh@uriah.heep.sax.de> <460igq$dag@atlantis.utmb.edu> <463fud$n55@news.rrz.uni-koeln.de>
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Stefan Esser <se@MI.Uni-Koeln.DE> wrote:
>|> Don't know about FreeBSD, but on Sun OS 4.1.x, using
"lp=/dev/null" like this fails on some kind of permission problem.
>Is the problem with /dev/null file locking ?
>This was on ULTRIX, but I guess that locking of /dev/null works
>just fine on any UNIX (does it ?).
j@uriah 88% perl -e 'open(NULL,">/dev/null");flock(NULL,2);$|=1;\
? for($i=0;$i<1000;$i++){print NULL "foo\n"; print ".";}' & \
? perl -e 'open(NULL,">/dev/null");flock(NULL,2);$|=1;\
? for($i=0;$i<1000;$i++){print NULL "foo\n"; print "+";}'
[1] 16618
+++++++++++++++++++++....................................................\
.........................................................................\
.........................................................................\
........+.+.+.+.+.+.+.+.+.+.+.+.+.+........................++++++++++++++\
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\
+++++++++++++++++++++++++++++++++++++++++++++++++++++++..................\
.........................................................................\
.........................................................................\
.........................................................................\
.........................................................................\
..................................+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.++.+.+.+.\
+.+.+.+.+.+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\
++++++++++++++++++++++++.................................................\
.........................................................................\
.........................................................................\
.........................................................................\
.........................................................................\
................................................+++++++++++++++++++++++++\
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\
+++++++++++++++++++++++++++++[1]
+ Done perl -e ...
So it doesn't seem you could lock /dev/null under FreeBSD. :)
(Long line broken for sanity.)
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)