fdfindsync
if (doagain == 0 || (rp = srp = fdfindsync(srp, erp)) == NULL) {
srp = rp = fdfindsync(crp, erp);
if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL) {
if ((rp = (u_short *)fdfindsync((u_long *)rp, (u_long *)erp)) == NULL)
u_long *fdfindsync(u_long *, u_long *);