1 .\" Copyright (c) 1986, 1993 2 .\" The Regents of the University of California. All rights reserved. 3 .\" 4 .\" %sccs.include.redist.roff% 5 .\" 6 .\" @(#)streamwrite.c 8.1 (Berkeley) 06/08/93 7 .\" 8 #include <sys/types.h> 9 #include <sys/socket.h> 10 #include <netinet/in.h> 11 #include <netdb.h> 12 #include <stdio.h> 13 14 #define DATA "Half a league, half a league . . ." 15 16 /* 17 * This program creates a socket and initiates a connection with the socket 18 * given in the command line. One message is sent over the connection and 19 * then the socket is closed, ending the connection. The form of the command 20 * line is streamwrite hostname portnumber 21 */ 22 23 main(argc, argv) 24 int argc; 25 char *argv[]; 26 { 27 int sock; 28 struct sockaddr_in server; 29 struct hostent *hp, *gethostbyname(); 30 char buf[1024]; 31 32 /* Create socket */ 33 sock = socket(AF_INET, SOCK_STREAM, 0); 34 if (sock < 0) { 35 perror("opening stream socket"); 36 exit(1); 37 } 38 /* Connect socket using name specified by command line. */ 39 server.sin_family = AF_INET; 40 hp = gethostbyname(argv[1]); 41 if (hp == 0) { 42 fprintf(stderr, "%s: unknown host\n", argv[1]); 43 exit(2); 44 } 45 bcopy(hp->h_addr, &server.sin_addr, hp->h_length); 46 server.sin_port = htons(atoi(argv[2])); 47 48 if (connect(sock, &server, sizeof(server)) < 0) { 49 perror("connecting stream socket"); 50 exit(1); 51 } 52 if (write(sock, DATA, sizeof(DATA)) < 0) 53 perror("writing on stream socket"); 54 close(sock); 55 } 56