/* Whether this is what all systems want or not, this is what
appears to be assumed in the source, for example data.c:arith_error. */
-typedef RETSIGTYPE (*signal_handler_t) (/*int*/);
+typedef RETSIGTYPE (*signal_handler_t) (int);
signal_handler_t sys_signal (int signal_number, signal_handler_t action);
sigset_t sys_sigblock (sigset_t new_mask);