On Sat, Jun 6, 2015 at 4:24 AM, Matthias Apitz <guru@unixarea.de> wrote:

Hallo,

I'm an active FreeBSD user and I'm trying to nail down a problem of
zombies caused by KDE components which make use of jack-audio-connection-kit-0.121.3

To get this debugged I have inserted a wrapper script as
/usr/local/bin/jackd which does some logging and calls at the end the
real jackd as jackd.bin (see below). I've stumbled over something in the
source and man page of jackd which I do not understand:

The man page explains the flag -l as for changing the LISTEN port, while
the implementation in the C-source use the flag -l to just print the
actual working directory (/tmp) and do exit(0); see below.

You're confused.

JACK Command line structure:

jackd [ server options ] -d [ backend name ] [ backend options ]

the same option may appear twice, once as a server option and once as a backend option. The semantics of each appearance are totally different.

-l is both a server option (meaning: print out the location of the directory where FIFOs exist to communicate with the the server), and an option for the net1 backend (meaning: define the listen port for sync packets).