81 lines
3.0 KiB
C
81 lines
3.0 KiB
C
.\" Copyright (c) 1986, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" 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.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)dgramsend.c 8.1 (Berkeley) 6/8/93
|
|
.\"
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <netdb.h>
|
|
#include <stdio.h>
|
|
|
|
#define DATA "The sea is calm tonight, the tide is full . . ."
|
|
|
|
/*
|
|
* Here I send a datagram to a receiver whose name I get from the command
|
|
* line arguments. The form of the command line is dgramsend hostname
|
|
* portnumber
|
|
*/
|
|
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
int sock;
|
|
struct sockaddr_in name;
|
|
struct hostent *hp, *gethostbyname();
|
|
|
|
/* Create socket on which to send. */
|
|
sock = socket(AF_INET, SOCK_DGRAM, 0);
|
|
if (sock < 0) {
|
|
perror("opening datagram socket");
|
|
exit(1);
|
|
}
|
|
/*
|
|
* Construct name, with no wildcards, of the socket to send to.
|
|
* Gethostbyname() returns a structure including the network address
|
|
* of the specified host. The port number is taken from the command
|
|
* line.
|
|
*/
|
|
hp = gethostbyname(argv[1]);
|
|
if (hp == 0) {
|
|
fprintf(stderr, "%s: unknown host\en", argv[1]);
|
|
exit(2);
|
|
}
|
|
bcopy(hp->h_addr, &name.sin_addr, hp->h_length);
|
|
name.sin_family = AF_INET;
|
|
name.sin_port = htons(atoi(argv[2]));
|
|
/* Send message. */
|
|
if (sendto(sock, DATA, sizeof(DATA), 0, &name, sizeof(name)) < 0)
|
|
perror("sending datagram message");
|
|
close(sock);
|
|
}
|