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      1 .\"	$NetBSD: ustreamread.c,v 1.3 2003/08/07 10:30:50 agc Exp $
      2 .\"
      3 .\" Copyright (c) 1986, 1993
      4 .\"	The Regents of the University of California.  All rights reserved.
      5 .\"
      6 .\" Redistribution and use in source and binary forms, with or without
      7 .\" modification, are permitted provided that the following conditions
      8 .\" are met:
      9 .\" 1. Redistributions of source code must retain the above copyright
     10 .\"    notice, this list of conditions and the following disclaimer.
     11 .\" 2. Redistributions in binary form must reproduce the above copyright
     12 .\"    notice, this list of conditions and the following disclaimer in the
     13 .\"    documentation and/or other materials provided with the distribution.
     14 .\" 3. Neither the name of the University nor the names of its contributors
     15 .\"    may be used to endorse or promote products derived from this software
     16 .\"    without specific prior written permission.
     17 .\"
     18 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     19 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     20 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     21 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     22 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     24 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     26 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28 .\" SUCH DAMAGE.
     29 .\"
     30 .\"	@(#)ustreamread.c	8.1 (Berkeley) 6/8/93
     31 .\"
     32 #include <sys/types.h>
     33 #include <sys/socket.h>
     34 #include <sys/un.h>
     35 #include <stdio.h>
     36 
     37 #define NAME "socket"
     38 
     39 /*
     40  * This program creates a socket in the UNIX domain and binds a name to it.
     41  * After printing the socket's name it begins a loop. Each time through the
     42  * loop it accepts a connection and prints out messages from it.  When the
     43  * connection breaks, or a termination message comes through, the program
     44  * accepts a new connection.
     45  */
     46 main()
     47 {
     48 	int sock, msgsock, rval;
     49 	struct sockaddr_un server;
     50 	char buf[1024];
     51 
     52 	/* Create socket */
     53 	sock = socket(AF_UNIX, SOCK_STREAM, 0);
     54 	if (sock < 0) {
     55 		perror("opening stream socket");
     56 		exit(1);
     57 	}
     58 	/* Name socket using file system name */
     59 	server.sun_family = AF_UNIX;
     60 	strcpy(server.sun_path, NAME);
     61 	if (bind(sock, &server, sizeof(struct sockaddr_un))) {
     62 		perror("binding stream socket");
     63 		exit(1);
     64 	}
     65 	printf("Socket has name %s\en", server.sun_path);
     66 	/* Start accepting connections */
     67 	listen(sock, 5);
     68 	for (;;) {
     69 		msgsock = accept(sock, 0, 0);
     70 		if (msgsock == -1)
     71 			perror("accept");
     72 		else do {
     73 			bzero(buf, sizeof(buf));
     74 			if ((rval = read(msgsock, buf, 1024)) < 0)
     75 				perror("reading stream message");
     76 			else if (rval == 0)
     77 				printf("Ending connection\en");
     78 			else
     79 				printf("-->%s\en", buf);
     80 		} while (rval > 0);
     81 		close(msgsock);
     82 	}
     83 	/*
     84 	 * The following statements are not executed, because they follow an
     85 	 * infinite loop.  However, most ordinary programs will not run
     86 	 * forever.  In the UNIX domain it is necessary to tell the file
     87 	 * system that one is through using NAME.  In most programs one uses
     88 	 * the call unlink() as below. Since the user will have to kill this
     89 	 * program, it will be necessary to remove the name by a command from
     90 	 * the shell.
     91 	 */
     92 	close(sock);
     93 	unlink(NAME);
     94 }
     95