SIGALRM 135 kernel/itimer.c kill_pid_info(SIGALRM, SEND_SIG_PRIV, sig->leader_pid);
SIGALRM 570 kernel/posix-timers.c new_timer->it_sigev_signo = SIGALRM;
SIGALRM 435 kernel/signal.c if (unlikely(signr == SIGALRM)) {