uv__signal_first_handle  146 src/unix/signal.c   for (handle = uv__signal_first_handle(signum);
uv__signal_first_handle  317 src/unix/signal.c   if (uv__signal_first_handle(signum) == NULL) {
uv__signal_first_handle  452 src/unix/signal.c   if (uv__signal_first_handle(handle->signum) == NULL)