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Annotation of 43BSDReno/share/doc/ps1/07.ipctut/strchkread.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[] = "@(#)strchkread.c       6.3 (Berkeley) 3/7/89";
        !            26: #endif /* not lint */
        !            27: 
        !            28: #include <sys/types.h>
        !            29: #include <sys/socket.h>
        !            30: #include <sys/time.h>
        !            31: #include <netinet/in.h>
        !            32: #include <netdb.h>
        !            33: #include <stdio.h>
        !            34: #define TRUE 1
        !            35: 
        !            36: /*
        !            37:  * This program uses select() to check that someone is trying to connect
        !            38:  * before calling accept(). 
        !            39:  */
        !            40: 
        !            41: main()
        !            42: {
        !            43:        int sock, length;
        !            44:        struct sockaddr_in server;
        !            45:        int msgsock;
        !            46:        char buf[1024];
        !            47:        int rval;
        !            48:        fd_set ready;
        !            49:        struct timeval to;
        !            50: 
        !            51:        /* Create socket */
        !            52:        sock = socket(AF_INET, SOCK_STREAM, 0);
        !            53:        if (sock < 0) {
        !            54:                perror("opening stream socket");
        !            55:                exit(1);
        !            56:        }
        !            57:        /* Name socket using wildcards */
        !            58:        server.sin_family = AF_INET;
        !            59:        server.sin_addr.s_addr = INADDR_ANY;
        !            60:        server.sin_port = 0;
        !            61:        if (bind(sock, &server, sizeof(server))) {
        !            62:                perror("binding stream socket");
        !            63:                exit(1);
        !            64:        }
        !            65:        /* Find out assigned port number and print it out */
        !            66:        length = sizeof(server);
        !            67:        if (getsockname(sock, &server, &length)) {
        !            68:                perror("getting socket name");
        !            69:                exit(1);
        !            70:        }
        !            71:        printf("Socket has port #%d\en", ntohs(server.sin_port));
        !            72: 
        !            73:        /* Start accepting connections */
        !            74:        listen(sock, 5);
        !            75:        do {
        !            76:                FD_ZERO(&ready);
        !            77:                FD_SET(sock, &ready);
        !            78:                to.tv_sec = 5;
        !            79:                if (select(sock + 1, &ready, 0, 0, &to) < 0) {
        !            80:                        perror("select");
        !            81:                        continue;
        !            82:                }
        !            83:                if (FD_ISSET(sock, &ready)) {
        !            84:                        msgsock = accept(sock, (struct sockaddr *)0, (int *)0);
        !            85:                        if (msgsock == -1)
        !            86:                                perror("accept");
        !            87:                        else do {
        !            88:                                bzero(buf, sizeof(buf));
        !            89:                                if ((rval = read(msgsock, buf, 1024)) < 0)
        !            90:                                        perror("reading stream message");
        !            91:                                else if (rval == 0)
        !            92:                                        printf("Ending connection\en");
        !            93:                                else
        !            94:                                        printf("-->%s\en", buf);
        !            95:                        } while (rval > 0);
        !            96:                        close(msgsock);
        !            97:                } else
        !            98:                        printf("Do something else\en");
        !            99:        } while (TRUE);
        !           100: }

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