/* k 0087	03/12/90	*/
/* k 0121	09/02/91	*/
/* k 0132	24/02/91	*/
#define PIPE_N  3
struct pipetype   {
  struct pipetype *free;	/* next free element */
  short fd;			/* pipe fd */
  short rsrv;			/* @0121 */
  struct segprf *assem;		/* @0132 */
		  };
struct pipe_table {
  short disp_size;		/* number of entries */
  short free_disp;		/* number of free entries */
  struct pipetype *first_free;  /* first free element pointer */
  struct pipetype other_disp[PIPE_N];
		  };