OT: setrlimit equivalent to prevent unlink or truncate

[Johannes Hofmann <hofmann@xxxxxxxxxxxxxxxxxxxxxx>]

Hi,

I'm wondering whether there is a way to prevent a process to modify 
the file system. setrlimit(RLIMIT_FSIZE) to 0 almost does the trick,
but unfortunately it does not prevent unlink() or truncate().
Is there any reason why there is no limit to prevent unlink or
truncate?

Cheers,
Johannes