returnmask       1228 kern/kern_sig.c 	int mask, returnmask;
returnmask       1294 kern/kern_sig.c 			returnmask = ps->ps_oldmask;
returnmask       1297 kern/kern_sig.c 			returnmask = p->p_sigmask;
returnmask       1314 kern/kern_sig.c 		(*p->p_emul->e_sendsig)(action, signum, returnmask, code,
returnmask        180 sys/signalvar.h void	sendsig(sig_t action, int sig, int returnmask, u_long code,