ptyfs_pty
pty_makedev((ptyfs)->ptyfs_type == PTYFSpts ? 't' : 'p', (ptyfs)->ptyfs_pty)
if (pty == pp->ptyfs_pty && pp->ptyfs_type == type) {
pp->ptyfs_pty = pty;
ptyfs_clr_active(vp->v_mount, ptyfs->ptyfs_pty);
ptyfs->ptyfs_type, ptyfs->ptyfs_pty);
if (pty_isfree(ptyfs->ptyfs_pty, 1))