Robert Rusek wrote: > > Thamk you for your reply, but I meant if I did not have the original > source. Is there anyway to tell from the binary? > If your kernel hasn't been stripped, you could use 'nm' or 'readelf' and look for 'irix' symbols. The second option is to try a SGI system call number and see if the kernel tells you if that is a valid system call or not. -S