Incorrect Process.setrlimit spec on (some?) Linux

[brixen]

Reported by Wilson LH 378

The Process.setrlimit spec for RLIMIT_MEMLOCK needs revision on Linux.
It appears to fail because the lim/max return values are not necessarily valid arguments to setrlimit.
While this is retarded, it is real, and needs some work.

I am currently installing Ubuntu so that I can debug this mess.

Process.setrlimit and Process.getrlimit limit and get total size for mlock(2) (bytes) ERROR
Invalid argument: 
                   Errno.handle at kernel/core/errno.rb:19
              Process.setrlimit at kernel/core/process.rb:35
           Object#__script__ {} at ./spec/ruby/1.8/core/process/setrlimit_spec.rb:73

[evanphx]

Appears to be running fine on linux now.