kill_pid_info
rc = kill_pid_info(SIGSEGV, &info, pid);
extern int kill_pid_info(int sig, struct kernel_siginfo *info, struct pid *pid);
error = kill_pid_info(sig, info, find_vpid(pid));
return kill_pid_info(sig, __si_special(priv), pid);
kill_pid_info(SIGALRM, SEND_SIG_PRIV, leader_pid);