NGX_EINPROGRESS   132 event/ngx_event_connect.c         if (err != NGX_EINPROGRESS
NGX_EINPROGRESS    70 os/unix/ngx_aio_read.c         if (n == NGX_EINPROGRESS) {
NGX_EINPROGRESS    65 os/unix/ngx_aio_write.c         if (n == NGX_EINPROGRESS) {
NGX_EINPROGRESS   157 os/unix/ngx_file_aio_read.c         if (n == NGX_EINPROGRESS) {