107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
.\" Copyright (c) 1986 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)strchkread.c 6.4 (Berkeley) 4/17/91
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.\"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <stdio.h>
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#define TRUE 1
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/*
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* This program uses select() to check that someone is trying to connect
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* before calling accept().
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*/
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main()
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{
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int sock, length;
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struct sockaddr_in server;
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int msgsock;
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char buf[1024];
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int rval;
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fd_set ready;
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struct timeval to;
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/* Create socket */
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sock = socket(AF_INET, SOCK_STREAM, 0);
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if (sock < 0) {
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perror("opening stream socket");
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exit(1);
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}
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/* Name socket using wildcards */
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server.sin_family = AF_INET;
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server.sin_addr.s_addr = INADDR_ANY;
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server.sin_port = 0;
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if (bind(sock, &server, sizeof(server))) {
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perror("binding stream socket");
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exit(1);
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}
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/* Find out assigned port number and print it out */
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length = sizeof(server);
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if (getsockname(sock, &server, &length)) {
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perror("getting socket name");
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exit(1);
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}
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printf("Socket has port #%d\en", ntohs(server.sin_port));
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/* Start accepting connections */
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listen(sock, 5);
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do {
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FD_ZERO(&ready);
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FD_SET(sock, &ready);
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to.tv_sec = 5;
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if (select(sock + 1, &ready, 0, 0, &to) < 0) {
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perror("select");
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continue;
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}
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if (FD_ISSET(sock, &ready)) {
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msgsock = accept(sock, (struct sockaddr *)0, (int *)0);
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if (msgsock == -1)
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perror("accept");
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else do {
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bzero(buf, sizeof(buf));
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if ((rval = read(msgsock, buf, 1024)) < 0)
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perror("reading stream message");
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else if (rval == 0)
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printf("Ending connection\en");
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else
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printf("-->%s\en", buf);
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} while (rval > 0);
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close(msgsock);
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} else
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printf("Do something else\en");
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} while (TRUE);
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}
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