Subject: RE: [linux-audio-user] jackd fails to start: cannot create shm segment /jack-shm-registry (No such file or directory)
From: Ivica Bukvic (ico_AT_fuse.net)
Date: Fri Apr 18 2003 - 23:10:20 EEST
/dev/shm exists right after install, but there is no entry in the
/etc/fstab.
The funny thing about the /dev/shm dir is that you cannot remove or
modify even as root. It's default creation date is Dec.31 1969 until it
gets mounted, at which point it converts itself to the appropriate date.
I had to manually add the below included line to fstab:
none /dev/shm tmpfs defaults 0 0
and had to mount it manually in order for the jack's ./configure to
report that it has successfully found POSIX memory sharing. Yet, the
error persists when the newly compiled jackd is started:
key for /tmp/jack/shm/jack-shm-registry is 0x6a0bdb99
cannot create shm segment /jack-shm-registry (No such file or directory)
cannot create engine
Should I simply revert to the older version of Jack until this stuff is
sorted out?
BTW, configure does revert to the other style of shared memory stuff
(System V shm) if it does not find POSIX one, but even if I compile that
one, I still end up with the same error/results.
Thanks for your help!
Ico
> -----Original Message-----
> From: linux-audio-user-admin_AT_music.columbia.edu
[mailto:linux-audio-user-
> admin_AT_music.columbia.edu] On Behalf Of Jack O'Quin
> Sent: Friday, April 18, 2003 3:42 PM
> To: linux-audio-user_AT_music.columbia.edu
> Subject: Re: [linux-audio-user] jackd fails to start: cannot create
shm
> segment /jack-shm-registry (No such file or directory)
>
> "Ivica Bukvic" <ico_AT_fuse.net> writes:
>
> > Hmm., I guess I was rejoicing prematurely...
> >
> > I added /dev/shm into fstab:
> >
> > none /dev/shm tmpfs defaults 0 0
> >
> > recompiled CVS jack (configure finds shm stuff ok)
> >
> > started jack and the same thingy happens:
> >
> > jackd -d alsa -d hw:0
> > jackd 0.68.0
> > Copyright 2001-2003 Paul Davis and others.
> > jackd comes with ABSOLUTELY NO WARRANTY
> > This is free software, and you are welcome to redistribute it
> > under certain conditions; see the file COPYING for details
> >
> > key for /tmp/jack/shm/jack-shm-registry is 0x6a0bdb99
> > cannot create shm segment /jack-shm-registry (No such file or
directory)
> > cannot create engine
> >
> > I guess I am back to square one.
> >
> > In addition, I forgot to mention one important issue with my other
> > machine (where Jack works), and that is that it was updated from
mdk9.0,
> > while this one was a clean install. After two clean installs on two
> > different machines, I noticed that neither had the shm entry in
fstab,
> > which obviously nullifies the possibility that it was a faulty
install
> > in the first place.
>
> Apparently, the POSIX shared memory implementation is not a standard
> part of most Linux distributions. That's a shame.
>
> > Again, any help is greatly appreciated! Sincerely,
>
> Does the directory /dev/shm exist? If not, "mkdir /dev/shm" (as
root).
> Then mount /dev/shm, and try starting jackd again.
>
> What does "grep shm /etc/fstab" say?
>
> Sorry this is such a hassle.
> --
> Jack O'Quin
> Austin, Texas, USA
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