LLA to DLPI Migration Guide, April 1997

Chapter 2 21

LLA and DLPI Example Programs

DLPI Example Program

/*********************************************************************

RESERVED. NO PART OF THIS PROGRAM MAY BE PHOTOCOPIED,

REPRODUCED, OR TRANSLATED TO ANOTHER PROGRAM LANGUAGE WITHOUT

THE PRIOR WRITTEN CONSENT OF HEWLETT PACKARD COMPANY

*********************************************************************/

/*********************************************************************

The main part of this program is composed of two parts.

The first part demonstrates data transfer over a connectionless

stream with LLC SAP headers. The second part of this program

demonstrates data transfer over a connectionless stream with

LLC SNAP headers.

*********************************************************************/

#include <stdio.h>

#include <fcntl.h>

#include <memory.h>

#include <sys/types.h>

#include <sys/stream.h>

#include <sys/stropts.h>

#include <sys/dlpi.h>

#include <sys/dlpi_ext.h>

#define SEND_SAP 0x80 /* sending SAP */

#define RECV_SAP 0x82 /* receiving SAP */

#define SNAP_SAP 0xAA /* SNAP SAP */

/*********************************************************************

SNAP protocol values.

*********************************************************************/

u_char SEND_SNAP_SAP[5] = {0x50, 0x00, 0x00, 0x00, 0x00};

u_char RECV_SNAP_SAP[5] = {0x60, 0x00, 0x00, 0x00, 0x00};

/*********************************************************************

global areas for sending and receiving messages

*********************************************************************/

#define AREA_SIZE 5000 /* bytes; big enough for largest possible msg */

#define LONG_AREA_SIZE (AREA_SIZE / sizeof(u_long)) /* AREA_SIZE / 4 */

u_long ctrl_area[LONG_AREA_SIZE];/* for control messages */

u_long data_area[LONG_AREA_SIZE];/* for data messages */

struct strbuf ctrl_buf = {

AREA_SIZE, /* maxlen = AREA_SIZE */

0, /* len gets filled in for each message */

ctrl_area /* buf = control area */

};