FIONBIO           242 event/modules/ngx_epoll_module.c         if (ioctl(ngx_eventfd, FIONBIO, &n) == -1) {
FIONBIO            32 os/unix/ngx_socket.c     return ioctl(s, FIONBIO, &nb);
FIONBIO            43 os/unix/ngx_socket.c     return ioctl(s, FIONBIO, &nb);