NGX_HAVE_ACCEPT4 29 event/ngx_event_accept.c #if (NGX_HAVE_ACCEPT4) NGX_HAVE_ACCEPT4 52 event/ngx_event_accept.c #if (NGX_HAVE_ACCEPT4) NGX_HAVE_ACCEPT4 72 event/ngx_event_accept.c #if (NGX_HAVE_ACCEPT4) NGX_HAVE_ACCEPT4 63 os/unix/ngx_posix_init.c #if (NGX_HAVE_INHERITED_NONBLOCK || NGX_HAVE_ACCEPT4)