178 lines
9.2 KiB
HTML
178 lines
9.2 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: Client application that uses AF_UNIX address family" />
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<meta name="abstract" content="This example provides a sample client application for 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 client application for 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="xafunixcl" />
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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: Client application that uses AF_UNIX address family</title>
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</head>
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<body id="xafunixcl"><a name="xafunixcl"><!-- --></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: Client application that uses AF_UNIX address family</h1>
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<div><p>This example provides a sample client application for the AF_UNIX
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address family. The AF_UNIX address family uses many of the same socket calls
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as other address families, except that it uses the path name
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structure to identify the server application. </p>
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<div class="section"><p>The following sample program uses the AF_UNIX address family to
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create a client connection to a server.</p>
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<div class="note"><span class="notetitle">Note:</span> By using the code examples,
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you agree to 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 client 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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/* Pass in 1 parameter which is either the */
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/* path name of the server as a UNICODE */
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/* string, or set the server path in the */
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/* #define SERVER_PATH which is a CCSID */
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/* 500 string. */
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void main(int argc, char *argv[])
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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, rc, bytesReceived;
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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 the socket descriptor is only done once at the very end */
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/* 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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/* If an argument was passed in, use this as the server, otherwise */
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/* use the #define that is located at the top of this program. */
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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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if (argc > 1)
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strcpy(serveraddr.sun_path, argv[1]);
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else
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strcpy(serveraddr.sun_path, SERVER_PATH);
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/********************************************************************/
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/* Use the connect() function to establish a connection to the */
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/* server. */
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/********************************************************************/
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rc = connect(sd, (struct sockaddr *)&serveraddr, SUN_LEN(&serveraddr));
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if (rc < 0)
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{
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perror("connect() failed");
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break;
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}
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/********************************************************************/
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/* Send 250 bytes of a's to the server */
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/********************************************************************/
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memset(buffer, 'a', sizeof(buffer));
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rc = send(sd, 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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/* In this example we know that the server is going to respond with */
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/* the same 250 bytes that we just sent. Since we know that 250 */
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/* bytes are going to be sent back to us, we can use the */
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/* SO_RCVLOWAT socket option and then issue a single recv() and */
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/* retrieve all of the data. */
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/* */
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/* The use of SO_RCVLOWAT is already illustrated in the server */
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/* side of this example, so we will do something different here. */
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/* The 250 bytes of the data may arrive in separate packets, */
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/* therefore we will issue recv() over and over again until all */
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/* 250 bytes have arrived. */
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/********************************************************************/
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bytesReceived = 0;
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while (bytesReceived < BUFFER_LENGTH)
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{
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rc = recv(sd, & buffer[bytesReceived],
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BUFFER_LENGTH - bytesReceived, 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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else if (rc == 0)
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{
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printf("The server closed the connection\n");
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break;
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}
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/*****************************************************************/
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/* Increment the number of bytes that have been received so far */
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/*****************************************************************/
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bytesReceived += rc;
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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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}</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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