sa_handler        434 event/modules/ngx_rtsig_module.c         sa.sa_handler = SIG_DFL;
sa_handler        633 event/ngx_event.c         sa.sa_handler = ngx_timer_signal_handler;
sa_handler        193 os/unix/ngx_freebsd_rfork_thread.c         sa.sa_handler = SIG_IGN;
sa_handler        289 os/unix/ngx_process.c         sa.sa_handler = sig->handler;