-int usleep(useconds_t);
-useconds_t ualarm(useconds_t, useconds_t);
-int setgroups(int, const gid_t []);
+int usleep(unsigned);
+unsigned ualarm(unsigned, unsigned);
+int setgroups(size_t, const gid_t []);
+int setresuid(uid_t, uid_t, uid_t);
+int setresgid(gid_t, gid_t, gid_t);