169 lines
6.8 KiB
HTML
169 lines
6.8 KiB
HTML
|
<?xml version="1.0" encoding="UTF-8"?>
|
||
|
|
<!DOCTYPE html
|
||
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||
|
|
<html lang="en-us" xml:lang="en-us">
|
||
|
|
<head>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
||
|
|
<meta name="security" content="public" />
|
||
|
|
<meta name="Robots" content="index,follow" />
|
||
|
|
<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
|
||
|
|
<meta name="DC.Type" content="reference" />
|
||
|
|
<meta name="DC.Title" content="Example: Server program to create a pool of multiple accept() worker jobs" />
|
||
|
|
<meta name="abstract" content="This example shows how to use the multiple accept() model to create a pool of worker jobs." />
|
||
|
|
<meta name="description" content="This example shows how to use the multiple accept() model to create a pool of worker jobs." />
|
||
|
|
<meta name="DC.Relation" scheme="URI" content="xmultiaccept.htm" />
|
||
|
|
<meta name="DC.Relation" scheme="URI" content="generic.htm" />
|
||
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
|
||
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2001, 2006" />
|
||
|
|
<meta name="DC.Format" content="XHTML" />
|
||
|
|
<meta name="DC.Identifier" content="x1mulitaccept" />
|
||
|
|
<meta name="DC.Language" content="en-us" />
|
||
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
||
|
|
<!-- US Government Users Restricted Rights -->
|
||
|
|
<!-- Use, duplication or disclosure restricted by -->
|
||
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
||
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
||
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
||
|
|
<title>Example: Server program to create a pool of multiple accept() worker
|
||
|
|
jobs</title>
|
||
|
|
</head>
|
||
|
|
<body id="x1mulitaccept"><a name="x1mulitaccept"><!-- --></a>
|
||
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
||
|
|
<h1 class="topictitle1">Example: Server program to create a pool of multiple <span class="apiname">accept()</span> worker
|
||
|
|
jobs</h1>
|
||
|
|
<div><p>This example shows how to use the multiple <span class="apiname">accept()</span> model
|
||
|
|
to create a pool of worker jobs.</p>
|
||
|
|
<div class="section"><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>/**************************************************************************/
|
||
|
|
/* Server example creates a pool of worker jobs with multiple accept() */
|
||
|
|
/**************************************************************************/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <sys/socket.h>
|
||
|
|
#include <netinet/in.h>
|
||
|
|
#include <spawn.h>
|
||
|
|
|
||
|
|
#define SERVER_PORT 12345
|
||
|
|
|
||
|
|
main (int argc, char *argv[])
|
||
|
|
{
|
||
|
|
int i, num, pid, rc, on = 1;
|
||
|
|
int listen_sd, accept_sd;
|
||
|
|
int spawn_fdmap[1];
|
||
|
|
char *spawn_argv[1];
|
||
|
|
char *spawn_envp[1];
|
||
|
|
struct inheritance inherit;
|
||
|
|
struct sockaddr_in addr;
|
||
|
|
|
||
|
|
/*************************************************/
|
||
|
|
/* If an argument was specified, use it to */
|
||
|
|
/* control the number of incoming connections */
|
||
|
|
/*************************************************/
|
||
|
|
if (argc >= 2)
|
||
|
|
num = atoi(argv[1]);
|
||
|
|
else
|
||
|
|
num = 1;
|
||
|
|
|
||
|
|
/*************************************************/
|
||
|
|
/* Create an AF_INET stream socket to receive */
|
||
|
|
/* incoming connections on */
|
||
|
|
/*************************************************/
|
||
|
|
listen_sd = socket(AF_INET, SOCK_STREAM, 0);
|
||
|
|
if (listen_sd < 0)
|
||
|
|
{
|
||
|
|
perror("socket() failed");
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*************************************************/
|
||
|
|
/* Allow socket descriptor to be reuseable */
|
||
|
|
/*************************************************/
|
||
|
|
rc = setsockopt(listen_sd,
|
||
|
|
SOL_SOCKET, SO_REUSEADDR,
|
||
|
|
(char *)&on, sizeof(on));
|
||
|
|
if (rc < 0)
|
||
|
|
{
|
||
|
|
perror("setsockopt() failed");
|
||
|
|
close(listen_sd);
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*************************************************/
|
||
|
|
/* Bind the socket */
|
||
|
|
/*************************************************/
|
||
|
|
memset(&addr, 0, sizeof(addr));
|
||
|
|
addr.sin_family = AF_INET;
|
||
|
|
addr.sin_addr.s_addr = htonl(INADDR_ANY);
|
||
|
|
addr.sin_port = htons(SERVER_PORT);
|
||
|
|
rc = bind(listen_sd,
|
||
|
|
(struct sockaddr *)&addr, sizeof(addr));
|
||
|
|
if (rc < 0)
|
||
|
|
{
|
||
|
|
perror("bind() failed");
|
||
|
|
close(listen_sd);
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*************************************************/
|
||
|
|
/* Set the listen back log */
|
||
|
|
/*************************************************/
|
||
|
|
rc = listen(listen_sd, 5);
|
||
|
|
if (rc < 0)
|
||
|
|
{
|
||
|
|
perror("listen() failed");
|
||
|
|
close(listen_sd);
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*************************************************/
|
||
|
|
/* Initialize parms prior to entering for loop */
|
||
|
|
/* */
|
||
|
|
/* The listen socket descriptor is mapped to */
|
||
|
|
/* descriptor 0 in the child program. */
|
||
|
|
/*************************************************/
|
||
|
|
memset(&inherit, 0, sizeof(inherit));
|
||
|
|
spawn_argv[0] = NULL;
|
||
|
|
spawn_envp[0] = NULL;
|
||
|
|
spawn_fdmap[0] = listen_sd;
|
||
|
|
|
||
|
|
/*************************************************/
|
||
|
|
/* Create each of the worker jobs */
|
||
|
|
/*************************************************/
|
||
|
|
printf("Creating worker jobs...\n");
|
||
|
|
for (i=0; i < num; i++)
|
||
|
|
{
|
||
|
|
pid = spawn("/QSYS.LIB/QGPL.LIB/WRKR4.PGM",
|
||
|
|
1, spawn_fdmap, &inherit,
|
||
|
|
spawn_argv, spawn_envp);
|
||
|
|
if (pid < 0)
|
||
|
|
{
|
||
|
|
perror("spawn() failed");
|
||
|
|
close(listen_sd);
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
printf(" Worker = %d\n", pid);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*************************************************/
|
||
|
|
/* Inform the user that the server is ready */
|
||
|
|
/*************************************************/
|
||
|
|
printf("The server is ready\n");
|
||
|
|
|
||
|
|
/*************************************************/
|
||
|
|
/* Close down the listening socket */
|
||
|
|
/*************************************************/
|
||
|
|
close(listen_sd);
|
||
|
|
}</pre>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<div>
|
||
|
|
<div class="familylinks">
|
||
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="xmultiaccept.htm" title="These examples show how to design a server program that uses the multiple accept() model for handling incoming connection requests.">Examples: Use multiple accept() APIs to handle incoming requests</a></div>
|
||
|
|
</div>
|
||
|
|
<div class="relref"><strong>Related reference</strong><br />
|
||
|
|
<div><a href="generic.htm" title="This code example contains the code for a common client job.">Example: Generic client</a></div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|