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<title>Example: Use sockets for interprocess communication</title>
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<body id="socketex"><a name="socketex"><!-- --></a>
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
<h1 class="topictitle1">Example: Use sockets for interprocess communication</h1>
<div><p>This example uses sockets to communicate between a Java™ program
and a C program. </p>
<div class="section"><p>You should start the C program first, which listens on a socket.
Once the Java program connects to the socket, the C program sends
it a string by using that socket connection. The string that is sent from
the C program is an American Standard Code for Information Interchange (ASCII)
string in codepage 819.</p>
<p>The Java program should be started using this
command, <samp class="codeph">java TalkToC xxxxx nnnn</samp> on the Qshell Interpreter
command line or on another Java platform. Or, enter <samp class="codeph">JAVA TALKTOC
PARM(xxxxx nnnn)</samp> on the iSeries™ command line to start the Java program. <samp class="codeph">xxxxx</samp> is
the domain name or Internet Protocol (IP) address of the system on which the
C program is running. <samp class="codeph">nnnn</samp> is the port number of the socket
that the C program is using. You should also use this port number as the first
parameter on the call to the C program.</p>
<p><strong>Example 1:</strong> TalkToC client
class</p>
<div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree to the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
<pre>import java.net.*;
import java.io.*;
class TalkToC
{
private String host = null;
private int port = -999;
private Socket socket = null;
private BufferedReader inStream = null;
public static void main(String[] args)
{
TalkToC caller = new TalkToC();
caller.host = args[0];
caller.port = new Integer(args[1]).intValue();
caller.setUp();
caller.converse();
caller.cleanUp();
} // end main() method
public void setUp()
{
System.out.println("TalkToC.setUp() invoked");
try
{
socket = new Socket(host, port);
inStream = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
}
catch(UnknownHostException e)
{
System.err.println("Cannot find host called: " + host);
e.printStackTrace();
System.exit(-1);
}
catch(IOException e)
{
System.err.println("Could not establish connection for " + host);
e.printStackTrace();
System.exit(-1);
}
} // end setUp() method
public void converse()
{
System.out.println("TalkToC.converse() invoked");
if (socket != null &amp;&amp; inStream != null)
{
try
{
System.out.println(inStream.readLine());
}
catch(IOException e)
{
System.err.println("Conversation error with host " + host);
e.printStackTrace();
}
} // end if
} // end converse() method
public void cleanUp()
{
try
{
if(inStream != null)
{
inStream.close();
}
if(socket != null)
{
socket.close();
}
} // end try
catch(IOException e)
{
System.err.println("Error in cleanup");
e.printStackTrace();
System.exit(-1);
}
} // end cleanUp() method
} // end TalkToC class</pre>
<p>SockServ.C starts by passing in a parameter for the port number.
For example, <samp class="codeph">CALL SockServ '2001'</samp>.</p>
<p><strong>Example 2:</strong> SockServ.C
server program</p>
<div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm">Code example
disclaimer</a> for important legal information.</div>
<pre>#include &lt;stdlib.h&gt;
#include &lt;stdio.h&gt;
#include &lt;errno.h&gt;
#include &lt;sys/types.h&gt;
#include &lt;sys/socket.h&gt;
#include &lt;netinet/in.h&gt;
#include &lt;netinet/tcp.h&gt;
#include &lt;unistd.h&gt;
#include &lt;sys/time.h&gt;
void main(int argc, char* argv[])
{
int portNum = atoi(argv[1]);
int server;
int client;
int address_len;
int sendrc;
int bndrc;
char* greeting;
struct sockaddr_in local_Address;
address_len = sizeof(local_Address);
memset(&amp;local_Address,0x00,sizeof(local_Address));
local_Address.sin_family = AF_INET;
local_Address.sin_port = htons(portNum);
local_Address.sin_addr.s_addr = htonl(INADDR_ANY);
#pragma convert (819)
greeting = "This is a message from the C socket server.";
#pragma convert (0)
/* allocate socket */
if((server = socket(AF_INET, SOCK_STREAM, 0))&lt;0)
{
printf("failure on socket allocation\n");
perror(NULL);
exit(-1);
}
/* do bind */
if((bndrc=bind(server,(struct sockaddr*)&amp;local_Address, address_len))&lt;0)
{
printf("Bind failed\n");
perror(NULL);
exit(-1);
}
/* invoke listen */
listen(server, 1);
/* wait for client request */
if((client = accept(server,(struct sockaddr*)NULL, 0))&lt;0)
{
printf("accept failed\n");
perror(NULL);
exit(-1);
}
/* send greeting to client */
if((sendrc = send(client, greeting, strlen(greeting),0))&lt;0)
{
printf("Send failed\n");
perror(NULL);
exit(-1);
}
close(client);
close(server);
}</pre>
<p>For more information, see <a href="sockets.htm">Use sockets
for interprocess communication</a>.</p>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="sockets.htm" title="Sockets streams communicate between programs that are running in separate processes.">Use sockets for interprocess communication</a></div>
</div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="codeex.htm" title="The following is a list of code examples for the IBM Developer Kit for Java.">Code examples for the IBM Developer Kit for Java</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
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</div>
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