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Annotation of 43BSDReno/share/doc/ps1/07.ipctut/strchkread.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[] = "@(#)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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