xref: /netbsd-src/share/doc/psd/20.ipctut/udgramread.c (revision 075022b349321510ad14036d70908681ed02f117)
1*075022b3Sagc .\"	$NetBSD: udgramread.c,v 1.3 2003/08/07 10:30:50 agc Exp $
26d400d56Sperry .\"
3d9158b13Scgd .\" Copyright (c) 1986, 1993
4d9158b13Scgd .\"	The Regents of the University of California.  All rights reserved.
5d9158b13Scgd .\"
6d9158b13Scgd .\" Redistribution and use in source and binary forms, with or without
7d9158b13Scgd .\" modification, are permitted provided that the following conditions
8d9158b13Scgd .\" are met:
9d9158b13Scgd .\" 1. Redistributions of source code must retain the above copyright
10d9158b13Scgd .\"    notice, this list of conditions and the following disclaimer.
11d9158b13Scgd .\" 2. Redistributions in binary form must reproduce the above copyright
12d9158b13Scgd .\"    notice, this list of conditions and the following disclaimer in the
13d9158b13Scgd .\"    documentation and/or other materials provided with the distribution.
14*075022b3Sagc .\" 3. Neither the name of the University nor the names of its contributors
15d9158b13Scgd .\"    may be used to endorse or promote products derived from this software
16d9158b13Scgd .\"    without specific prior written permission.
17d9158b13Scgd .\"
18d9158b13Scgd .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19d9158b13Scgd .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20d9158b13Scgd .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21d9158b13Scgd .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22d9158b13Scgd .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23d9158b13Scgd .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24d9158b13Scgd .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25d9158b13Scgd .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26d9158b13Scgd .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27d9158b13Scgd .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28d9158b13Scgd .\" SUCH DAMAGE.
29d9158b13Scgd .\"
30d9158b13Scgd .\"	@(#)udgramread.c	8.1 (Berkeley) 6/8/93
31d9158b13Scgd .\"
32d9158b13Scgd #include <sys/types.h>
33d9158b13Scgd #include <sys/socket.h>
34d9158b13Scgd #include <sys/un.h>
35d9158b13Scgd 
36d9158b13Scgd /*
37d9158b13Scgd  * In the included file <sys/un.h> a sockaddr_un is defined as follows
38d9158b13Scgd  * struct sockaddr_un {
39d9158b13Scgd  *	short	sun_family;
40d9158b13Scgd  *	char	sun_path[108];
41d9158b13Scgd  * };
42d9158b13Scgd  */
43d9158b13Scgd 
44d9158b13Scgd #include <stdio.h>
45d9158b13Scgd 
46d9158b13Scgd #define NAME "socket"
47d9158b13Scgd 
48d9158b13Scgd /*
49d9158b13Scgd  * This program creates a UNIX domain datagram socket, binds a name to it,
50d9158b13Scgd  * then reads from the socket.
51d9158b13Scgd  */
52d9158b13Scgd main()
53d9158b13Scgd {
54d9158b13Scgd 	int sock, length;
55d9158b13Scgd 	struct sockaddr_un name;
56d9158b13Scgd 	char buf[1024];
57d9158b13Scgd 
58d9158b13Scgd 	/* Create socket from which to read. */
59d9158b13Scgd 	sock = socket(AF_UNIX, SOCK_DGRAM, 0);
60d9158b13Scgd 	if (sock < 0) {
61d9158b13Scgd 		perror("opening datagram socket");
62d9158b13Scgd 		exit(1);
63d9158b13Scgd 	}
64d9158b13Scgd 	/* Create name. */
65d9158b13Scgd 	name.sun_family = AF_UNIX;
66d9158b13Scgd 	strcpy(name.sun_path, NAME);
67d9158b13Scgd 	if (bind(sock, &name, sizeof(struct sockaddr_un))) {
68d9158b13Scgd 		perror("binding name to datagram socket");
69d9158b13Scgd 		exit(1);
70d9158b13Scgd 	}
71d9158b13Scgd 	printf("socket -->%s\en", NAME);
72d9158b13Scgd 	/* Read from the socket */
73d9158b13Scgd 	if (read(sock, buf, 1024) < 0)
74d9158b13Scgd 		perror("receiving datagram packet");
75d9158b13Scgd 	printf("-->%s\en", buf);
76d9158b13Scgd 	close(sock);
77d9158b13Scgd 	unlink(NAME);
78d9158b13Scgd }
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