Return to ustreamread.c CVS log

Up to [CSRG BSD Unix] / 43BSDReno / share / doc / ps1 / 07.ipctut

Annotation of 43BSDReno/share/doc/ps1/07.ipctut/ustreamread.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1986 The Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #ifndef lint
                     19: char copyright[] =
                     20: "@(#) Copyright (c) 1986 The Regents of the University of California.\n\
                     21:  All rights reserved.\n";
                     22: #endif /* not lint */
                     23: 
                     24: #ifndef lint
                     25: static char sccsid[] = "@(#)ustreamread.c      6.4 (Berkeley) 3/7/89";
                     26: #endif /* not lint */
                     27: 
                     28: #include <sys/types.h>
                     29: #include <sys/socket.h>
                     30: #include <sys/un.h>
                     31: #include <stdio.h>
                     32: 
                     33: #define NAME "socket"
                     34: 
                     35: /*
                     36:  * This program creates a socket in the UNIX domain and binds a name to it. 
                     37:  * After printing the socket's name it begins a loop. Each time through the
                     38:  * loop it accepts a connection and prints out messages from it.  When the
                     39:  * connection breaks, or a termination message comes through, the program
                     40:  * accepts a new connection. 
                     41:  */
                     42: main()
                     43: {
                     44:        int sock, msgsock, rval;
                     45:        struct sockaddr_un server;
                     46:        char buf[1024];
                     47: 
                     48:        /* Create socket */
                     49:        sock = socket(AF_UNIX, SOCK_STREAM, 0);
                     50:        if (sock < 0) {
                     51:                perror("opening stream socket");
                     52:                exit(1);
                     53:        }
                     54:        /* Name socket using file system name */
                     55:        server.sun_family = AF_UNIX;
                     56:        strcpy(server.sun_path, NAME);
                     57:        if (bind(sock, &server, sizeof(struct sockaddr_un))) {
                     58:                perror("binding stream socket");
                     59:                exit(1);
                     60:        }
                     61:        printf("Socket has name %s\en", server.sun_path);
                     62:        /* Start accepting connections */
                     63:        listen(sock, 5);
                     64:        for (;;) {
                     65:                msgsock = accept(sock, 0, 0);
                     66:                if (msgsock == -1)
                     67:                        perror("accept");
                     68:                else do {
                     69:                        bzero(buf, sizeof(buf));
                     70:                        if ((rval = read(msgsock, buf, 1024)) < 0)
                     71:                                perror("reading stream message");
                     72:                        else if (rval == 0)
                     73:                                printf("Ending connection\en");
                     74:                        else
                     75:                                printf("-->%s\en", buf);
                     76:                } while (rval > 0);
                     77:                close(msgsock);
                     78:        }
                     79:        /*
                     80:         * The following statements are not executed, because they follow an
                     81:         * infinite loop.  However, most ordinary programs will not run
                     82:         * forever.  In the UNIX domain it is necessary to tell the file
                     83:         * system that one is through using NAME.  In most programs one uses
                     84:         * the call unlink() as below. Since the user will have to kill this
                     85:         * program, it will be necessary to remove the name by a command from
                     86:         * the shell. 
                     87:         */
                     88:        close(sock);
                     89:        unlink(NAME);
                     90: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.