xs_single
error = xs_single(t, XS_DIRECTORY, sbuf_data(path), &len,
error = xs_single(t, XS_READ, sbuf_data(path), len, &ret);
ret = xs_single(t, XS_MKDIR, sbuf_data(path), NULL, NULL);
ret = xs_single(t, XS_RM, sbuf_data(path), NULL, NULL);
error = xs_single(XST_NIL, XS_TRANSACTION_START, "", NULL,
return (xs_single(t, XS_TRANSACTION_END, abortstr, NULL, NULL));