PTYFS_MODIFY
while ((ptyfs)->ptyfs_status & (PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY)) \
ptyfs->ptyfs_status |= PTYFS_CHANGE | PTYFS_MODIFY;
ptyfs->ptyfs_status |= PTYFS_MODIFY;
KASSERT(ptyfs->ptyfs_status & (PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY));
if (ptyfs->ptyfs_status & PTYFS_MODIFY) {
ptyfs->ptyfs_status &= ~(PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY);