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Annotation of 43BSDReno/share/doc/ps1/07.ipctut/dgramsend.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[] = "@(#)dgramsend.c        6.3 (Berkeley) 3/7/89";
        !            26: #endif /* not lint */
        !            27: 
        !            28: #include <sys/types.h>
        !            29: #include <sys/socket.h>
        !            30: #include <netinet/in.h>
        !            31: #include <netdb.h>
        !            32: #include <stdio.h>
        !            33: 
        !            34: #define DATA "The sea is calm tonight, the tide is full . . ."
        !            35: 
        !            36: /*
        !            37:  * Here I send a datagram to a receiver whose name I get from the command
        !            38:  * line arguments.  The form of the command line is dgramsend hostname
        !            39:  * portnumber 
        !            40:  */
        !            41: 
        !            42: main(argc, argv)
        !            43:        int argc;
        !            44:        char *argv[];
        !            45: {
        !            46:        int sock;
        !            47:        struct sockaddr_in name;
        !            48:        struct hostent *hp, *gethostbyname();
        !            49: 
        !            50:        /* Create socket on which to send. */
        !            51:        sock = socket(AF_INET, SOCK_DGRAM, 0);
        !            52:        if (sock < 0) {
        !            53:                perror("opening datagram socket");
        !            54:                exit(1);
        !            55:        }
        !            56:        /*
        !            57:         * Construct name, with no wildcards, of the socket to send to.
        !            58:         * Getnostbyname() returns a structure including the network address
        !            59:         * of the specified host.  The port number is taken from the command
        !            60:         * line. 
        !            61:         */
        !            62:        hp = gethostbyname(argv[1]);
        !            63:        if (hp == 0) {
        !            64:                fprintf(stderr, "%s: unknown host\n", argv[1]);
        !            65:                exit(2);
        !            66:        }
        !            67:        bcopy(hp->h_addr, &name.sin_addr, hp->h_length);
        !            68:        name.sin_family = AF_INET;
        !            69:        name.sin_port = htons(atoi(argv[2]));
        !            70:        /* Send message. */
        !            71:        if (sendto(sock, DATA, sizeof(DATA), 0, &name, sizeof(name)) < 0)
        !            72:                perror("sending datagram message");
        !            73:        close(sock);
        !            74: }

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