realtime audio: is there a patch for bash, or is PAM the only way atm.

egag · 08-09-2005, 12:55 PM

hi there,

since the 2.6.12 kernel, it's possible to get realtime priority as user
without patching the kernel.
to use this, there's atm. only a patch for PAM ( that i know of ).

see:

http://lwn.net/Articles/134460/

and

http://www.steamballoon.com/wiki/Rlimits

now as Slackware doesn't use PAM, i would rather patch bash to have
" ulimit " options to give such priorities.

does anyone know if such a patch for bash exists at all ?
and if not, what could be the consequences of installing
a patched PAM on Slackware.

any thoughts are welcome.

egag

karlos4321 · 10-19-2005, 04:52 PM

I use agnula-demudi for audio work (a debian based distro ..http://www.agnula.org/) it comes with something called LSM ( linux security module ) which is indeed a realtime patch. it has to be configured to apply realtime prioritys to group 21 (audio) somehow. I managed to get it to work with ubuntu too at one point but I cant remember how?? It is preconfigured in agnula tho..
http://lsm.immunix.org/
that's probably a good place to start

egag · 10-20-2005, 12:08 PM

thanks for the link, but that gives only kernel-patches. ( and also not for 2.6.x kernels )
i currently use the lsm-module from : http://www.joq.us/realtime/

with newer kernels ( >2.6.12 ) it's also possible to get rt-priority
for user prog's without the need of that module,
but you need a patched PAM to use it. ( and Slackware has no PAM ).

so a patch for bash to set those priorities would be nice, but i couldn't find one.
guess i'll just have to wait, i can live with that module.

egag