busy loop due to lack of error handling

[Tim Waugh]

Under some error conditions the hpcups filter will go into a busy loop and continually fill /var/log/messages with this message:

HP-LaserJet-3055: prnt/hpijs/services.cpp 386: unable to write to output, fd=1, count=4096: Broken pipe

In particular, if the backend has exited before the filter has finished, this condition is easy to trigger.

Create an hpcups queue (e.g. for HP LaserJet 3055) with a device URI that uses a backend which immediately exits with status code 0. Now print anything to that queue.

1. ln -s /bin/true /usr/lib/cups/backend
2. lpadmin -p HP-LaserJet-3055 -m drv:///hp/hpcups.drv/hp-laserjet_3055.ppd -v true:/// -E
3. echo . | lp -d HP-LaserJet-3055

HPLIP-3.9.8

Original bug report:
  https://bugzilla.redhat.com/show_bug.cgi?id=525944

[anup (osta6161)]

Can you please try out with latest version of hplip (3.9.10)?

Thanks,

A

[Tim Waugh (twaugh)]

Seems to work.

Didn't you just take out the error-checking though? ;-)

    write (STDOUT_FILENO, pData, iLength);
    return NO_ERROR;