NGX_USE_FD_EVENT  186 src/event/modules/ngx_devpoll_module.c     ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT;
NGX_USE_FD_EVENT   98 src/event/modules/ngx_poll_module.c     ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT;
NGX_USE_FD_EVENT  655 src/event/ngx_event.c     if (ngx_event_flags & NGX_USE_FD_EVENT) {