248 lines
11 KiB
HTML
248 lines
11 KiB
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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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Example: A connection-oriented server" />
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<meta name="abstract" content="This code example shows how a connection-oriented server can be created." />
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<meta name="description" content="This code example shows how a connection-oriented server can be created." />
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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: A connection-oriented server</title>
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</head>
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<body id="xconoserver"><a name="xconoserver"><!-- --></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: A connection-oriented server</h1>
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<div><p>This code example shows how a connection-oriented server can be
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created.</p>
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<div class="section"><p>You can use this example to create your own socket server application.
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A connection-oriented server design is one of the most common models for socket
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applications. In a connection-oriented design, the server application creates
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a socket to accept client requests. </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 a code for a connection-oriented server. */
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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 <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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/**************************************************************************/
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/* Constants used by this program */
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/**************************************************************************/
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#define SERVER_PORT 3005
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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, on=1;
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char buffer[BUFFER_LENGTH];
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fd_set read_fd;
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struct timeval timeout;
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struct sockaddr_in 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 INET */
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/* (Internet Protocol) address family with the TCP transport */
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/* (SOCK_STREAM) will be used for this socket. */
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/********************************************************************/
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sd = socket(AF_INET, 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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/* The setsockopt() function is used to allow the local address to */
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/* be reused when the server is restarted before the required wait */
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/* time expires. */
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/********************************************************************/
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rc = setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on));
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if (rc < 0)
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{
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perror("setsockopt(SO_REUSEADDR) 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. In this example, the user sets the */
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/* s_addr to zero, which allows connections to be established from */
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/* any client that specifies port 3005. */
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/********************************************************************/
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memset(&serveraddr, 0, sizeof(serveraddr));
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serveraddr.sin_family = AF_INET;
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serveraddr.sin_port = htons(SERVER_PORT);
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serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
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rc = bind(sd, (struct sockaddr *)&serveraddr, sizeof(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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/* The select() function allows the process to wait for an event to */
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/* occur and to wake up the process when the event occurs. In this */
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/* example, the system notifies the process only when data is */
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/* available to read. A 30 second timeout is used on this select */
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/* call. */
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/********************************************************************/
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timeout.tv_sec = 30;
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timeout.tv_usec = 0;
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FD_ZERO(&read_fd);
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FD_SET(sd2, &read_fd);
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rc = select(sd2+1, &read_fd, NULL, NULL, &timeout);
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if (rc < 0)
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{
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perror("select() failed");
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break;
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}
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if (rc == 0)
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{
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printf("select() timed out.\n");
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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 until*/
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/* 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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}</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="connectionor.htm" title="These server and client examples illustrate socket APIs written for a connection-oriented protocol such as Transmission Control Protocol (TCP).">Create a connection-oriented socket</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="connectionor.htm" title="These server and client examples illustrate socket APIs written for a connection-oriented protocol such as Transmission Control Protocol (TCP).">Create a connection-oriented socket</a></div>
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<div><a href="uafinet.htm" title="AF_INET address family sockets can be either connection-oriented (type SOCK_STREAM) or they can be connectionless (type SOCK_DGRAM).">Use AF_INET address family</a></div>
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</div>
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</div>
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</body>
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