kill 738 os/unix/ngx_freebsd_rfork_thread.c if (kill(cv->tid, cv->signo) == -1) { kill 574 os/unix/ngx_process.c if (kill(pid, sig->signo) != -1) { kill 533 os/unix/ngx_process_cycle.c if (kill(ngx_processes[i].pid, signo) == -1) {