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- /* Copyright 1986 by Carnegie Mellon */
- /* Copyright 1983 by the Massachusetts Institute of Technology */
-
- #ifndef NETBUF_H /* DDP */
- #define NETBUF_H 1 /* DDP */
-
- #include <net.h>
-
- /* The buffer organization is somewhat intertwined with the queue organization.
- Each buffer is in a queue, either the free queue or the used queue
- (or the buffer is currently being used by a user program or the
- interrupt level routines, in which case it does not appear in a
- queue). When a buffer is in a queue, it has a pointer to the next
- buffer in the queue. If there is no next buffer, its pointer points
- at nullbuf. Also, each buffer knows its own length. */
-
- /* This include file gives the structure of buffers. */
-
- #define NBUFINIT 10 /* A Goodly Number */
-
- #ifdef LPKT /* DDP/LKR */
- #define LBUFINIT 1324 /* DDP/LKR */
- #else /* DDP/LKR */
- #define LBUFINIT 620 /* A Goodly Length */
- #endif /* DDP/LKR */
-
- #define nullbuf (struct net_buf *)0 /* The null buffer and/or queue
- entry */
- extern int NBUF; /* # of packet buffers */
- extern int LBUF; /* length of each packet buffers */
-
- struct net_buf {
- q_elt nb_elt; /* queue link */
- char *nb_prot; /* beginning of contents of packet */
- long nb_tstamp; /* packet timestamp */
- unsigned nb_len; /* Length of buffer */
- char *nb_buff; /* The buffer itself! */
- };
-
- typedef struct net_buf *PACKET;
-
-
- #endif /* DDP */
-