202 lines
9.7 KiB
HTML
202 lines
9.7 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: Server application that uses AF_UNIX address family" />
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<meta name="abstract" content="This example provides a sample program that uses the AF_UNIX address family. The AF_UNIX address family uses many of the same socket calls as other address families, except that it uses the path name structure to identify the server application." />
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<meta name="description" content="This example provides a sample program that uses the AF_UNIX address family. The AF_UNIX address family uses many of the same socket calls as other address families, except that it uses the path name structure to identify the server application." />
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<meta name="DC.Relation" scheme="URI" content="uafunix.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="xafunixsrv" />
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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: Server application that uses AF_UNIX address family</title>
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</head>
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<body id="xafunixsrv"><a name="xafunixsrv"><!-- --></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: Server application that uses AF_UNIX address family</h1>
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<div><p>This example provides a sample program that uses the AF_UNIX address
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family. The AF_UNIX address family uses many of the same socket calls as other
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address families, except that it uses the path name structure
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to identify the server application. </p>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree to
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the terms of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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</div>
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<div class="section"><pre>/**************************************************************************/
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/* This sample program provides code for a server application that uses */
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/* AF_UNIX address family */
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/**************************************************************************/
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/**************************************************************************/
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/* Header files needed for this sample program */
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/**************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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/**************************************************************************/
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/* Constants used by this program */
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/**************************************************************************/
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#define SERVER_PATH "/tmp/server"
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#define BUFFER_LENGTH 250
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#define FALSE 0
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void main()
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{
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/***********************************************************************/
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/* Variable and structure definitions. */
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/***********************************************************************/
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int sd=-1, sd2=-1;
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int rc, length;
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char buffer[BUFFER_LENGTH];
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struct sockaddr_un serveraddr;
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/***********************************************************************/
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/* A do/while(FALSE) loop is used to make error cleanup easier. The */
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/* close() of each of the socket descriptors is only done once at the */
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/* very end of the program. */
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/***********************************************************************/
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do
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{
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/********************************************************************/
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/* The socket() function returns a socket descriptor representing */
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/* an endpoint. The statement also identifies that the UNIX */
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/* address family with the stream transport (SOCK_STREAM) will be */
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/* used for this socket. */
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/********************************************************************/
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sd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (sd < 0)
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{
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perror("socket() failed");
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break;
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}
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/********************************************************************/
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/* After the socket descriptor is created, a bind() function gets a */
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/* unique name for the socket. */
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/********************************************************************/
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memset(&serveraddr, 0, sizeof(serveraddr));
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serveraddr.sun_family = AF_UNIX;
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strcpy(serveraddr.sun_path, SERVER_PATH);
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rc = bind(sd, (struct sockaddr *)&serveraddr, SUN_LEN(&serveraddr));
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if (rc < 0)
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{
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perror("bind() failed");
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break;
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}
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/********************************************************************/
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/* The listen() function allows the server to accept incoming */
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/* client connections. In this example, the backlog is set to 10. */
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/* This means that the system will queue 10 incoming connection */
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/* requests before the system starts rejecting the incoming */
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/* requests. */
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/********************************************************************/
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rc = listen(sd, 10);
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if (rc< 0)
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{
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perror("listen() failed");
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break;
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}
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printf("Ready for client connect().\n");
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/********************************************************************/
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/* The server uses the accept() function to accept an incoming */
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/* connection request. The accept() call will block indefinitely */
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/* waiting for the incoming connection to arrive. */
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/********************************************************************/
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sd2 = accept(sd, NULL, NULL);
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if (sd2 < 0)
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{
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perror("accept() failed");
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break;
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}
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/********************************************************************/
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/* In this example we know that the client will send 250 bytes of */
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/* data over. Knowing this, we can use the SO_RCVLOWAT socket */
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/* option and specify that we don't want our recv() to wake up */
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/* until all 250 bytes of data have arrived. */
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/********************************************************************/
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length = BUFFER_LENGTH;
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rc = setsockopt(sd2, SOL_SOCKET, SO_RCVLOWAT,
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(char *)&length, sizeof(length));
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if (rc < 0)
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{
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perror("setsockopt(SO_RCVLOWAT) failed");
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break;
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}
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/****************************************************/
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/* Receive that 250 bytes data from the client */
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/****************************************************/
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rc = recv(sd2, buffer, sizeof(buffer), 0);
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if (rc < 0)
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{
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perror("recv() failed");
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break;
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}
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printf("%d bytes of data were received\n", rc);
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if (rc == 0 ||
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rc < sizeof(buffer))
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{
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printf("The client closed the connection before all of the\n");
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printf("data was sent\n");
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break;
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}
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/********************************************************************/
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/* Echo the data back to the client */
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/********************************************************************/
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rc = send(sd2, buffer, sizeof(buffer), 0);
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if (rc < 0)
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{
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perror("send() failed");
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break;
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}
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/********************************************************************/
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/* Program complete */
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/********************************************************************/
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} while (FALSE);
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/***********************************************************************/
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/* Close down any open socket descriptors */
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/***********************************************************************/
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if (sd != -1)
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close(sd);
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if (sd2 != -1)
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close(sd2);
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/***********************************************************************/
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/* Remove the UNIX path name from the file system */
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/***********************************************************************/
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unlink(SERVER_PATH);
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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="uafunix.htm" title="The AF_UNIX address family (sockets using the AF_UNIX or AF_UNIX_CCSID address families) can be connection-oriented (type SOCK_STREAM) or they can be connectionless (type SOCK_DGRAM).">Use AF_UNIX address family</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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