linux-master/kernel/signal.c

88 	/* SIGKILL and SIGSTOP may not be sent to the global init */
1218 	/* Should SIGKILL or SIGSTOP be received by a pid namespace init? */
1228 		/* SIGKILL and SIGSTOP is special or has ids */
2411  * do_signal_stop - handle group stop for SIGSTOP and other stop signals
2842 			 * do nothing in an orphaned pgrp, but SIGSTOP
2849 			if (signr != SIGSTOP) {
3082 	sigdelsetmask(newset, sigmask(SIGKILL) | sigmask(SIGSTOP));
3208 		sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP));
3238 		sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP));
3639 	sigdelsetmask(&mask, sigmask(SIGKILL) | sigmask(SIGSTOP));
4200 			      sigmask(SIGKILL) | sigmask(SIGSTOP));