118094e60b
regents and renumber. This patch skips files in contrib/ and crypto/ Acked by: imp Discussed with: emaste
80 lines
2.8 KiB
C
80 lines
2.8 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. 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.
|
|
.\"
|
|
.\" @(#)dgramread.c 8.1 (Berkeley) 6/8/93
|
|
.\"
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <stdio.h>
|
|
|
|
/*
|
|
* In the included file <netinet/in.h> a sockaddr_in is defined as follows:
|
|
* struct sockaddr_in {
|
|
* short sin_family;
|
|
* u_short sin_port;
|
|
* struct in_addr sin_addr;
|
|
* char sin_zero[8];
|
|
* };
|
|
*
|
|
* This program creates a datagram socket, binds a name to it, then reads
|
|
* from the socket.
|
|
*/
|
|
main()
|
|
{
|
|
int sock, length;
|
|
struct sockaddr_in name;
|
|
char buf[1024];
|
|
|
|
/* Create socket from which to read. */
|
|
sock = socket(AF_INET, SOCK_DGRAM, 0);
|
|
if (sock < 0) {
|
|
perror("opening datagram socket");
|
|
exit(1);
|
|
}
|
|
/* Create name with wildcards. */
|
|
name.sin_family = AF_INET;
|
|
name.sin_addr.s_addr = INADDR_ANY;
|
|
name.sin_port = 0;
|
|
if (bind(sock, &name, sizeof(name))) {
|
|
perror("binding datagram socket");
|
|
exit(1);
|
|
}
|
|
/* Find assigned port value and print it out. */
|
|
length = sizeof(name);
|
|
if (getsockname(sock, &name, &length)) {
|
|
perror("getting socket name");
|
|
exit(1);
|
|
}
|
|
printf("Socket has port #%d\en", ntohs(name.sin_port));
|
|
/* Read from the socket */
|
|
if (read(sock, buf, 1024) < 0)
|
|
perror("receiving datagram packet");
|
|
printf("-->%s\en", buf);
|
|
close(sock);
|
|
}
|