On 2/23/06, Ismael Valladolid Torres <ivalladt@xxxxxxxxxxx> wrote: > Carlo Capocasa escribe: > > > > > group audio getting realtime only using PAM via > > > > I'm using the PAM binary package straight of ubuntustudio.com on Debian > > Etch and it works like a charm. > > > > Carlo > > > > I was missing that page! So there are three ways to get realtime, > realtime-lsm which is deprecated (why, exactly?), set_rlimits which > seems tricky, and the recommended rlimits aware PAM way. I am trying > the last one, but libpam_modules at sid is 0.79 not 0.76, and I will > need to recompile for powerpc and still don't know if patch will apply > cleanly. Carlo, there is more than one way to do EVERYTHING in Linux. Realtime-lsm is convenient, and currently still available in Debian and Ubuntu. It was a hack created due to kernel develops apparently not listening to people who needed some method for non-root users to run apps in realtime mode. As of kernel 2.6.12, the kernel now has the capabilities to do what we want. But the problem doesn't stop there, your system still needs some way of knowing which users can run which apps with realtime priorities. PAM is the way to do this. PAM 0.80 and newer do support it OOTB, but as you know Debian and Ubuntu Dapper both currently have 0.79, so the patch is needed. So why is set_rlimits even around? Well, not every distro even ships with PAM. Slackware users don't have PAM. So they need a different method to allow access to the rtprio capability. This app will work on Debian and Ubuntu if you don't want to patch your PAM and don't want to use the deprecated realtime-lsm. I hope that sufficiently explains why there are three options. This information has been discussed before as well, so I'm sure you could have found it on your own, but here it is again, conveniently for you. Now, to patch your 0.79 PAM, here are the steps for Dapper, should work on Debian, just make whatever adjustments you need: cd /tmp/ sudo apt-get install build-essential devscripts fakeroot apt-get source libpam-modules sudo apt-get build-dep libpam-modules wget http://www.ubuntustudio.com/uploads/pam-0.79-rlimits.patch cd pam-0.79/ mv ../pam-0.79-rlimits.patch debian/patches-applied/61-rlimits patch -p1 < debian/patches-applied/61-rlimits DEBEMAIL=pam@xxxxxxxxxxxxxxxx dch -v 0.79-3ubuntu9studio1 Added patch for rlimits, glibc hack, and default config. debuild -us -uc sudo dpkg -i /tmp/libpam-modules_0.79-3ubuntu9studio1_i386.deb Dana.
