__os_fsync
int __os_fsync __P((int));
if ((ret = __os_fsync(dblp->lfd)) != 0) {
syncfail = __os_fsync(dbmfp->fd) != 0;
return (incomplete ? DB_INCOMPLETE : __os_fsync(dbmfp->fd));
if (__os_fsync(fd) == -1)