Add Linux-specific setfsuid(2)/setfsgid(2)
I would be helpful if you add a binding to the Linux-specific syscalls
Their purpose is to change the uid/gid with which filesystem access control is performed. Their main usage is simulating fs access on behalf of other users.
Differently from setuid/setreuid/etc... thess calls have thread-local effect, thus they may be useful in solving some problems when needing to temporarily drop privileges in multi-threaded applications.