590	AUE_NULL	STD {
		int fchroot(
		    int fd
		);
	}
591	AUE_SETCRED	STD|CAPENABLED {
		int setcred(
		    u_int flags,
		    _In_reads_bytes_(size) _Contains_ptr_ const struct setcred *wcred,
		    size_t size
		);
	}

fchroot
Could factor this into a generic with Solaris

setcred
Need to add the wcred structure, otherwise should be easy