oerr
oerr = ifs.int_data.oerrors - ifp->int_data.oerrors;
if (ierr < 0 || in < 0 || oerr < 0 || out < 0) {
if (in == 0 && out == 0 && ierr == 0 && oerr == 0)
|| (out <= oerr && oerr > 0)) {
in, ierr, out, oerr);
in, ierr, out, oerr);
int in, ierr, out, oerr;
oerr:
goto oerr;
oerr();
void oerr(void);
oerr();