194 lines
7.9 KiB
HTML
194 lines
7.9 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<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))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example: Create a server that uses spawn()" />
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<meta name="abstract" content="This example shows how to use the spawn() API to create a child process that inherits the socket descriptor from the parent." />
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<meta name="description" content="This example shows how to use the spawn() API to create a child process that inherits the socket descriptor from the parent." />
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<meta name="DC.Relation" scheme="URI" content="xspawn.htm" />
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<meta name="DC.Relation" scheme="URI" content="spwnwrkr.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2001, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="xspwnserver" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Example: Create a server that uses spawn()</title>
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</head>
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<body id="xspwnserver"><a name="xspwnserver"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: Create a server that uses <span class="apiname">spawn()</span></h1>
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<div><p>This example shows how to use the <span class="apiname">spawn()</span> API
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to create a child process that inherits the socket descriptor from the parent. </p>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree to the terms
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of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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<pre>/**************************************************************************/
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/* Application creates an child process using spawn(). */
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/**************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <spawn.h>
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#define SERVER_PORT 12345
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main (int argc, char *argv[])
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{
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int i, num, pid, rc, on = 1;
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int listen_sd, accept_sd;
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int spawn_fdmap[1];
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char *spawn_argv[1];
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char *spawn_envp[1];
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struct inheritance inherit;
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struct sockaddr_in addr;
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/*************************************************/
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/* If an argument was specified, use it to */
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/* control the number of incoming connections */
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/*************************************************/
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if (argc >= 2)
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num = atoi(argv[1]);
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else
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num = 1;
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/*************************************************/
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/* Create an AF_INET stream socket to receive */
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/* incoming connections on */
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/*************************************************/
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listen_sd = socket(AF_INET, SOCK_STREAM, 0);
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if (listen_sd < 0)
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{
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perror("socket() failed");
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exit(-1);
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}
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/*************************************************/
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/* Allow socket descriptor to be reuseable */
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/*************************************************/
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rc = setsockopt(listen_sd,
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SOL_SOCKET, SO_REUSEADDR,
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(char *)&on, sizeof(on));
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if (rc < 0)
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{
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perror("setsockopt() failed");
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close(listen_sd);
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exit(-1);
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}
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/*************************************************/
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/* Bind the socket */
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/*************************************************/
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(SERVER_PORT);
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addr.sin_addr.s_addr = htonl(INADDR_ANY);
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rc = bind(listen_sd,
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(struct sockaddr *)&addr, sizeof(addr));
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if (rc < 0)
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{
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perror("bind() failed");
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close(listen_sd);
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exit(-1);
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}
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/*************************************************/
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/* Set the listen back log */
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/*************************************************/
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rc = listen(listen_sd, 5);
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if (rc < 0)
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{
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perror("listen() failed");
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close(listen_sd);
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exit(-1);
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}
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/*************************************************/
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/* Inform the user that the server is ready */
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/*************************************************/
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printf("The server is ready\n");
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/*************************************************/
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/* Go through the loop once for each connection */
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/*************************************************/
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for (i=0; i < num; i++)
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{
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/**********************************************/
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/* Wait for an incoming connection */
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/**********************************************/
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printf("Interation: %d\n", i+1);
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printf(" waiting on accept()\n");
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accept_sd = accept(listen_sd, NULL, NULL);
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if (accept_sd < 0)
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{
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perror("accept() failed");
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close(listen_sd);
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exit(-1);
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}
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printf(" accept completed successfully\n");
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/**********************************************/
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/* Initialize the spawn parameters */
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/* */
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/* The socket descriptor for the new */
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/* connection is mapped over to descriptor 0 */
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/* in the child program. */
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/**********************************************/
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memset(&inherit, 0, sizeof(inherit));
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spawn_argv[0] = NULL;
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spawn_envp[0] = NULL;
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spawn_fdmap[0] = accept_sd;
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/**********************************************/
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/* Create the worker job */
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/**********************************************/
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printf(" creating worker job\n");
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pid = spawn("/QSYS.LIB/QGPL.LIB/WRKR1.PGM",
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1, spawn_fdmap, &inherit,
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spawn_argv, spawn_envp);
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if (pid < 0)
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{
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perror("spawn() failed");
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close(listen_sd);
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close(accept_sd);
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exit(-1);
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}
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printf(" spawn completed successfully\n");
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/**********************************************/
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/* Close down the incoming connection since */
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/* it has been given to a worker to handle */
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/**********************************************/
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close(accept_sd);
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}
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/*************************************************/
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/* Close down the listen socket */
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/*************************************************/
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close(listen_sd);
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}</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="xspawn.htm" title="This example shows how a server program can use the spawn() API to create a child process that inherits the socket descriptor from the parent.">Example: Use the spawn() API to create child processes</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="spwnwrkr.htm" title="This example contains the code that enables the worker job to receive a data buffer from the client job and echo it back.">Example: Enable the worker job to receive a data buffer</a></div>
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</div>
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</div>
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</body>
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</html>
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