TDB_XSIG
tdt->td_dbgflags &= ~(TDB_SUSPEND | TDB_XSIG |
td->td_dbgflags |= TDB_XSIG;
while ((p->p_flag & P_TRACED) && (td->td_dbgflags & TDB_XSIG)) {
td->td_dbgflags &= ~TDB_XSIG;
td->td_dbgflags &= ~TDB_XSIG;
td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
p->p_xthread->td_dbgflags &= ~TDB_XSIG;
if (td2->td_dbgflags & TDB_XSIG) {