Subject: [netatalk-admins] pap gets stuck, blocked, whatever...
From: Brad G. Parks (bparks@homer.acs.bethel.edu)
Date: Fri Jun 19 1998 - 18:21:29 EDT
Well, more precisely, it's the ifpap/pap/ofpap usage that gets hung.
Whenever I use pap to directly send a file to a printer there's never
a problem. (The printer I'm testing with is a 12/640 PS, although
I have experienced this problem on one or two other Apple printers.)
My printcap entry is fine, everything works about 80% of the time.
But every once in a while, pap gives up on sending a job to the
printer. I do not want to use the LPD port of the Apple printers
because I need to count pages.
I've watched many packets fly across the network between pap and
the printer and have determined that it is definitely pap that gets
stuck -- the printer sends a few more packets to the server but it
never answers.
After much tracking it down, I have found the culprit to be in
libatalk/atp/atp_packet.c -- the recvfrom() call in middle of
recv_atp. I'm guessing that our little socket is blocking...
So, my question is: What can I do about it?
Do I dare set the socket to non-blocking?
Should I write some sort of wrapper to use pap more directly?
Do I want to put in a little signal/timer/something to abort
the recvfrom()? Would that even do any good?
-Brad G. Parks
bparks NEAR bethel.edu
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