Home | History | Annotate | Line # | Download | only in 20.ipctut 
      1 .\"	$NetBSD: strchkread.c,v 1.3 2003/08/07 10:30:50 agc Exp $
      2 .\"
      3 .\" Copyright (c) 1986, 1993
      4 .\"	The Regents of the University of California.  All rights reserved.
      5 .\"
      6 .\" Redistribution and use in source and binary forms, with or without
      7 .\" modification, are permitted provided that the following conditions
      8 .\" are met:
      9 .\" 1. Redistributions of source code must retain the above copyright
     10 .\"    notice, this list of conditions and the following disclaimer.
     11 .\" 2. Redistributions in binary form must reproduce the above copyright
     12 .\"    notice, this list of conditions and the following disclaimer in the
     13 .\"    documentation and/or other materials provided with the distribution.
     14 .\" 3. Neither the name of the University nor the names of its contributors
     15 .\"    may be used to endorse or promote products derived from this software
     16 .\"    without specific prior written permission.
     17 .\"
     18 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     19 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     20 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     21 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     22 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     24 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     26 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28 .\" SUCH DAMAGE.
     29 .\"
     30 .\"	@(#)strchkread.c	8.1 (Berkeley) 6/8/93
     31 .\"
     32 #include <sys/types.h>
     33 #include <sys/socket.h>
     34 #include <sys/time.h>
     35 #include <netinet/in.h>
     36 #include <netdb.h>
     37 #include <stdio.h>
     38 #define TRUE 1
     39 
     40 /*
     41  * This program uses select() to check that someone is trying to connect
     42  * before calling accept().
     43  */
     44 
     45 main()
     46 {
     47 	int sock, length;
     48 	struct sockaddr_in server;
     49 	int msgsock;
     50 	char buf[1024];
     51 	int rval;
     52 	fd_set ready;
     53 	struct timeval to;
     54 
     55 	/* Create socket */
     56 	sock = socket(AF_INET, SOCK_STREAM, 0);
     57 	if (sock < 0) {
     58 		perror("opening stream socket");
     59 		exit(1);
     60 	}
     61 	/* Name socket using wildcards */
     62 	server.sin_family = AF_INET;
     63 	server.sin_addr.s_addr = INADDR_ANY;
     64 	server.sin_port = 0;
     65 	if (bind(sock, &server, sizeof(server))) {
     66 		perror("binding stream socket");
     67 		exit(1);
     68 	}
     69 	/* Find out assigned port number and print it out */
     70 	length = sizeof(server);
     71 	if (getsockname(sock, &server, &length)) {
     72 		perror("getting socket name");
     73 		exit(1);
     74 	}
     75 	printf("Socket has port #%d\en", ntohs(server.sin_port));
     76 
     77 	/* Start accepting connections */
     78 	listen(sock, 5);
     79 	do {
     80 		FD_ZERO(&ready);
     81 		FD_SET(sock, &ready);
     82 		to.tv_sec = 5;
     83 		if (select(sock + 1, &ready, 0, 0, &to) < 0) {
     84 			perror("select");
     85 			continue;
     86 		}
     87 		if (FD_ISSET(sock, &ready)) {
     88 			msgsock = accept(sock, (struct sockaddr *)0, (int *)0);
     89 			if (msgsock == -1)
     90 				perror("accept");
     91 			else do {
     92 				bzero(buf, sizeof(buf));
     93 				if ((rval = read(msgsock, buf, 1024)) < 0)
     94 					perror("reading stream message");
     95 				else if (rval == 0)
     96 					printf("Ending connection\en");
     97 				else
     98 					printf("-->%s\en", buf);
     99 			} while (rval > 0);
    100 			close(msgsock);
    101 		} else
    102 			printf("Do something else\en");
    103 	} while (TRUE);
    104 }
    105