share/doc/psd/20.ipctut/streamwrite.c

   1 .\"     $NetBSD: streamwrite.c,v 1.2 1998/01/09 06:55:05 perry Exp $
   2 .\"
   3 .\" Copyright (c) 1986, 1993
   4 .\"     The Regents of the University of California.  All rights reserved.
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   6 .\" Redistribution and use in source and binary forms, with or without
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  11 .\" 2. Redistributions in binary form must reproduce the above copyright
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  13 .\"    documentation and/or other materials provided with the distribution.
  14 .\" 3. Neither the name of the University nor the names of its contributors
  15 .\"    may be used to endorse or promote products derived from this software
  16 .\"    without specific prior written permission.
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  18 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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  30 .\"     @(#)streamwrite.c       8.1 (Berkeley) 6/8/93
  31 .\"
  32 #include <sys/types.h>
  33 #include <sys/socket.h>
  34 #include <netinet/in.h>
  35 #include <netdb.h>
  36 #include <stdio.h>
  37
  38 #define DATA "Half a league, half a league . . ."
  39
  40 /*
  41  * This program creates a socket and initiates a connection with the socket
  42  * given in the command line.  One message is sent over the connection and
  43  * then the socket is closed, ending the connection. The form of the command
  44  * line is streamwrite hostname portnumber
  45  */
  46
  47 main(argc, argv)
  48         int argc;
  49         char *argv[];
  50 {
  51         int sock;
  52         struct sockaddr_in server;
  53         struct hostent *hp, *gethostbyname();
  54         char buf[1024];
  55
  56         /* Create socket */
  57         sock = socket(AF_INET, SOCK_STREAM, 0);
  58         if (sock < 0) {
  59                 perror("opening stream socket");
  60                 exit(1);
  61         }
  62         /* Connect socket using name specified by command line. */
  63         server.sin_family = AF_INET;
  64         hp = gethostbyname(argv[1]);
  65         if (hp == 0) {
  66                 fprintf(stderr, "%s: unknown host\n", argv[1]);
  67                 exit(2);
  68         }
  69         bcopy(hp->h_addr, &server.sin_addr, hp->h_length);
  70         server.sin_port = htons(atoi(argv[2]));
  71
  72         if (connect(sock, &server, sizeof(server)) < 0) {
  73                 perror("connecting stream socket");
  74                 exit(1);
  75         }
  76         if (write(sock, DATA, sizeof(DATA)) < 0)
  77                 perror("writing on stream socket");
  78         close(sock);
  79 }