SETENTRY
if (P->flags & SETENTRY) {
P->flags &= ~(SETSIG|SETFAULT|SETENTRY|SETEXIT|SETHOLD|SETREGS);
P->flags &= ~(SETSIG|SETFAULT|SETENTRY|SETEXIT);
SETENTRY, PRMAXSYS, which, stop));
P->flags |= SETENTRY;