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Operation not permitted...sort of

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http://forums.fedoraforum.org – I'm having a really frustrating problem. I maintain a realtime application that uses the RTAI extensions. Before you tell me to go post on their list please read the whole post and know that I already have posted on their list. OS: Fedora Core 15 Kernel: 2.6.38.8 64-bit with RTAI patches SELinux is disabled I've stripped the realtime code down to a small programs that illustrates the problem which is this: Process tries to change it's scheduling and/or priority using this code (excerpt only of course, but will compile): Code: #include <stdio.h> #include <errno.h> #includ (HowTos)