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32 Chapter 2
LLA and DLPI Example Programs
LLA Example Program
LLA Example Program
/***************************************************************************
(C) COPYRIGHT HEWLETT-PACKARD COMPANY 1992. ALL RIGHTS
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 LLA
with LLC SAP headers. The second part of this program
demonstrates data transfer over LLA with LLC SNAP headers.
**************************************************************************/
#include <stdio.h>
#include <fcntl.h>
#include <memory.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/netio.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 MAX_PKT_SIZE 1500 /* Maximum packet size for Ethernet */
u_long data_area[MAX_PKT_SIZE]; /* for data messages */
struct fis ctrl_buf;
/*************************************************************************
Read a packet on LLA file descriptor fd.
**************************************************************************/
int
get_pkt(fd)
int fd; /* file descriptor */
{
int recv_cnt;