Hello Patrick,
Text files are sent in a bounce queue in which they are processed using a filter, then
files are
sent in other queue.
If the filter in bounce queue produces no output, lpd tries to send this printing
job, which
includes zero length data file, to the next queue. Transmition of zero length data
file causes
blocking of this queue.
2 functions are involved in this blocking: Link_send() and Link_file_read() .
Link_send()
1. transmits 0 bytes with 'ack', it seems there no actions in depth of TCP/IP.
2. waits to read 'ack'.
Link_file_read():
1. waits to read 0 bytes.
Thanks,
Sergiy Kovalenko
Firmengruppe Dr. Gueldener
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