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