/* client.c - client task for simple client/server network demo *//* Copyright 1984-1993 Wind River Systems, Inc. */#include "copyright_wrs.h"/*modification history--------------------01j,15feb93,jcf  added mixed endian support.01i,13feb93,jcf  cleaned.01h,31oct91,rrr  passed through the ansification filter		  -changed copyright notice01g,07jun89,gae  used ntohs on SERVER_NUM; changed SOCKADDR to struct sockaddr.01f,29aug88,gae  fixed printStatus, documentation, allowed inet addresses.01e,30may88,dnw  changed to v4 names.01d,28may88,dnw  changed call to fioStdIn to STD_IN.01c,06apr87,gae  caught some lint.  Got rid of excess includes.01b,08jan87,jlf  minor rearrangement, to meet coding conventions.		 changed <> to " in includes.01a,17sep86,llk  written.*//*DESCRIPTIONThis is a simple demonstration of the server-client relationship.This is the client. The other half of the demonstration is in server.cEXAMPLEOn the UNIX host "wrs":    % serverOn the VxWorks target:    -> ld < client.o    -> client "wrs"When you type characters into VxWorks, they will be echoed by the serveron UNIX.  Type control-D to terminate.*/#include "vxWorks.h"#include "fioLib.h"#include "stdio.h"#include "unistd.h"#include "string.h"#include "usrLib.h"#include "errnoLib.h"#include "hostLib.h"#include "sockLib.h"#include "socket.h"#include "inetLib.h"#include "in.h"#include "serverDemo.h"IMPORT char sysBootHost [];	/* VxWorks saves name of host booted from *//* make 'clientSock' a global variable so that if something goes wrong * when the client runs on VxWorks, the socket can be closed. */int clientSock;		/* socket opened to server *//********************************************************************************* client - client task** This is a simple client program which connects to the server* via a socket.  It reads characters from standard input and sends* them onto the server through the socket.  It stops when it reads* 0 characters (receives an EOF).** The server runs on UNIX, client runs on VxWorks.** RETURNS: OK or ERROR*/STATUS client (hostName)    char *hostName; /* name of host running server, 0=boot host */    {    struct sockaddr_in	serverAddr;	/* server's address */    struct sockaddr_in	clientAddr;	/* client's address */    int		nBytes;			/* number of bytes read from stdin */    char	c;    if (hostName == NULL)	hostName = sysBootHost;    /* Zero out the sock_addr structures.     * This MUST be done before the socket call.     */    bzero ((char *) &serverAddr, sizeof (serverAddr));    bzero ((char *) &clientAddr, sizeof (clientAddr));    /* Open the socket.     * Use ARPA Internet address format and stream sockets.     * Format described in "socket.h".     */    clientSock = socket (AF_INET, SOCK_STREAM, 0);    if (clientSock == ERROR)	return (ERROR);    serverAddr.sin_family = AF_INET;    serverAddr.sin_port   = htons(SERVER_NUM);    /* get server's Internet address */    if ((serverAddr.sin_addr.s_addr = inet_addr (hostName)) == ERROR &&	(serverAddr.sin_addr.s_addr = hostGetByName (hostName)) == ERROR)	{	printf ("Invalid host: \"%s\"\n", hostName);	printErrno (errnoGet ());	close (clientSock);	return (ERROR);	}    printf ("Server's address is %x:\n", htonl (serverAddr.sin_addr.s_addr));    if (connect (clientSock, (struct sockaddr *)&serverAddr,		    sizeof (serverAddr)) == ERROR)	{	printf ("Connect failed:\n");	printErrno (errnoGet ());	close (clientSock);	return (ERROR);	}    printf ("Connected...\n");    /* repeatedly read from standard input and send to socket until EOF */    while (TRUE)	{	/* read a character from standard input */	if ((nBytes = read (STD_IN, &c, 1)) == 0)	    {	    /* client read an EOF; exit the loop. */	    break;	    }	else if (nBytes != 1)	    {	    printf ("CLIENT read error, %d bytes read\n", nBytes);	    printErrno (errnoGet ());	    break;	    }	/* send byte to server */	if (send (clientSock, &c, 1, 0) != 1)	    {	    printf ("CLIENT write error:\n");	    printErrno (errnoGet ());	    }	}    /* close socket from the VxWorks side */    close (clientSock);    printf ("\n...goodbye\n");    return (OK);    }