BSD 4_3_Net_2 release

[unix-history] / usr / src / share / doc / ps1 / 07.ipctut / streamwrite.c

.\" Copyright (c) 1986 The Regents of the University of California.
.\" All rights reserved.
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.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\"	@(#)streamwrite.c	6.4 (Berkeley) 4/17/91
.\"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>

#define DATA "Half a league, half a league . . ."

/*
 * This program creates a socket and initiates a connection with the socket
 * given in the command line.  One message is sent over the connection and
 * then the socket is closed, ending the connection. The form of the command
 * line is streamwrite hostname portnumber 
 */

main(argc, argv)
	int argc;
	char *argv[];
{
	int sock;
	struct sockaddr_in server;
	struct hostent *hp, *gethostbyname();
	char buf[1024];

	/* Create socket */
	sock = socket(AF_INET, SOCK_STREAM, 0);
	if (sock < 0) {
		perror("opening stream socket");
		exit(1);
	}
	/* Connect socket using name specified by command line. */
	server.sin_family = AF_INET;
	hp = gethostbyname(argv[1]);
	if (hp == 0) {
		fprintf(stderr, "%s: unknown host\n", argv[1]);
		exit(2);
	}
	bcopy(hp->h_addr, &server.sin_addr, hp->h_length);
	server.sin_port = htons(atoi(argv[2]));

	if (connect(sock, &server, sizeof(server)) < 0) {
		perror("connecting stream socket");
		exit(1);
	}
	if (write(sock, DATA, sizeof(DATA)) < 0)
		perror("writing on stream socket");
	close(sock);
}