/share/doc/psd/20.ipctut/streamread.c

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 32.\"	@(#)streamread.c	8.1 (Berkeley) 6/8/93
 33.\"
 34#include <sys/types.h>
 35#include <sys/socket.h>
 36#include <netinet/in.h>
 37#include <netdb.h>
 38#include <stdio.h>
 39#define TRUE 1
 40
 41/*
 42 * This program creates a socket and then begins an infinite loop. Each time
 43 * through the loop it accepts a connection and prints out messages from it.
 44 * When the connection breaks, or a termination message comes through, the
 45 * program accepts a new connection.
 46 */
 47
 48main()
 49{
 50	int sock, length;
 51	struct sockaddr_in server;
 52	int msgsock;
 53	char buf[1024];
 54	int rval;
 55	int i;
 56
 57	/* Create socket */
 58	sock = socket(AF_INET, SOCK_STREAM, 0);
 59	if (sock < 0) {
 60		perror("opening stream socket");
 61		exit(1);
 62	}
 63	/* Name socket using wildcards */
 64	server.sin_family = AF_INET;
 65	server.sin_addr.s_addr = INADDR_ANY;
 66	server.sin_port = 0;
 67	if (bind(sock, &server, sizeof(server))) {
 68		perror("binding stream socket");
 69		exit(1);
 70	}
 71	/* Find out assigned port number and print it out */
 72	length = sizeof(server);
 73	if (getsockname(sock, &server, &length)) {
 74		perror("getting socket name");
 75		exit(1);
 76	}
 77	printf("Socket has port #%d\en", ntohs(server.sin_port));
 78
 79	/* Start accepting connections */
 80	listen(sock, 5);
 81	do {
 82		msgsock = accept(sock, 0, 0);
 83		if (msgsock == -1)
 84			perror("accept");
 85		else do {
 86			bzero(buf, sizeof(buf));
 87			if ((rval = read(msgsock, buf, 1024)) < 0)
 88				perror("reading stream message");
 89			i = 0;
 90			if (rval == 0)
 91				printf("Ending connection\en");
 92			else
 93				printf("-->%s\en", buf);
 94		} while (rval != 0);
 95		close(msgsock);
 96	} while (TRUE);
 97	/*
 98	 * Since this program has an infinite loop, the socket "sock" is
 99	 * never explicitly closed.  However, all sockets will be closed
100	 * automatically when a process is killed or terminates normally.
101	 */
102}