bsd/kern/kern_sig.c

378 	    signum == SIGKILL || signum == SIGSTOP)
577 	if ((signum == SIGKILL || signum == SIGSTOP) &&
1283 	/* SIGKILL and SIGSTOP are not maskable as well */
1890 	 *	SIGKILL priority twiddling moved here from above because
1893 	 *	as SIGKILL's action is always SIG_DFL.
1895 	if ((signum == SIGKILL) && (sig_proc->p_nice > NZERO)) {
1998 				psignal_locked(sig_proc, SIGKILL);
2063 		case SIGKILL:
2121 			 * needs to act like SIGKILL
2337 			 * pgsignal would get the SIGKILL to traced program
2340 			if (ut->uu_siglist & sigmask(SIGKILL)) {
2358 					      p->p_pid, W_EXITCODE(0, SIGKILL), 2, 0, 0);
2359 				exit1(p, W_EXITCODE(0, SIGKILL), (int *)NULL);