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

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