unixclient.c

Tornado train workshop的配套实验教材

/* unixClient - send an integer to the vxWorks server */

/* Copyright 1984-1994 Wind River Systems, Inc. */

/*
modification history
--------------------
01b,05dec94,bss  cleaned up.  WRS coding conventions enforced. 
01a,???????,???  written.
*/

/*
DESCRIPTION
This module provides a simple example of the issues involved in
sending data between different machines:  these machines
might store data with different byte orderings, structure
alignments, floating-point representations, etc.

In this example, we are only sending an integer to the server so
we will only deal with byte ordering.  The client converts
the data from a machine-dependent byte-ordering
to a standard representation (network byte ordering) and
sends the data to the server.  The server then converts the data
from the standard representation to the machine-dependent
representation on the server.  Finally the server sends
a reply to the client.

NOTE:  This code was written in the pre-ANSI style to facilitate
	compilation with the native Sun compiler cc.  To compile
	this code with an ANSI compiler, use the -traditional flag.
*/

/* includes */

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

/* defines */

#define MAX_MSG_LEN 80

#define LOCAL static	/* for WRS coding conventions */

/* typedefs */

typedef int SOCK_FD;

/* forward declarations */

LOCAL void error();

/*******************************************************************************
 *
 * main - entry point to unixClient
 *
 * This function sets up a socket and send an integer in
 * network byte ordering to vxServer.  This is a simple
 * example of the issues of data representation which
 * are encountered in network programming.
 */

main (argc, argv)
	int argc;
	char **argv;
	{
	short 	port;						/* Server's port number */
	int		inetAddr;					/* Server's inet address */
	struct	sockaddr_in srvAddr;		/* Server's socket address */
	int   	val;						/* Value to send the server */
	SOCK_FD sockFd;						/* Client's socket */
	char 	replyBuf [MAX_MSG_LEN];		/* Place to put the server's reply */


	/* Get the server port number, inet address, and value to send */
	if (argc != 4)
		{
		fprintf (stderr, "Usage: %s portNumber inetAddress value\n", argv[0]);
		exit (1);
		}
	port	 = (short) atoi (argv [1]);
	inetAddr = inet_addr (argv [2]);
	val		 = atoi (argv [3]);
	

	/* Create a socket */

	/* Initialize servers address */

	/* Send the server the value */

	/* Read and then print the servers reply */

	/* Close socket */


	}


/*******************************************************************************
 *
 * error - aborts a process on an error 
 *
 * This funcion displays the reason a process crashed 
 * and terminates that process.
 */

LOCAL void error (pStr)
	char * pStr;
	{
	perror (pStr);
	exit (1);
	}