NGX_ENOSYS       1172 event/ngx_event.c     } else if (ngx_errno != NGX_ENOSYS) {
NGX_ENOSYS         78 event/ngx_event_accept.c             if (use_accept4 && err == NGX_ENOSYS) {
NGX_ENOSYS        117 os/unix/ngx_file_aio_read.c         if (n == NGX_ENOSYS) {
NGX_ENOSYS        114 os/unix/ngx_linux_aio_read.c     if (n == NGX_ENOSYS) {
NGX_ENOSYS         61 os/unix/ngx_linux_init.c         if (err != NGX_ENOTDIR && err != NGX_ENOSYS) {