__DTF_SKIPREAD
dirp->dd_flags |= __DTF_SKIPREAD;
if ((flags & (__DTF_READALL | __DTF_SKIPREAD)) != 0)
dirp->dd_flags &= ~__DTF_SKIPREAD;
!(dirp->dd_flags & (__DTF_READALL | __DTF_SKIPREAD))) {
dirp->dd_flags &= ~__DTF_SKIPREAD;
dirp->dd_flags &= ~__DTF_SKIPREAD; /* current contents are invalid */
dirp->dd_flags |= __DTF_SKIPREAD;
dirp->dd_flags &= ~__DTF_SKIPREAD; /* current contents are invalid */