www.pudn.com > vxWorks_Lab.rar > unixClient.c

/* 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  
#include  
#include  
#include  
 
/* 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); 
	}