struct vp {
int vp_state;
struct buf *vp_buf;
ushort vp_count;
int vp_offset;
};
extern struct vp vp_vp[];
struct da {
struct buf *da_bp;
int da_cnt, da_off;
int da_cs, da_db;
struct proc *da_proc;
int da_flags;
};
extern struct da da_da[];
struct du {
char *du_buf;
char *du_bufp;
int du_nxmit;
char du_state;
char du_dummy;
struct proc *du_proc;
char *du_bufb;
char *du_bufe;
int du_nleft;
};
extern struct du du_du[];