?? timeclnt.c
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/* timeclnt.c - a client for timeserv.c * usage: timeclnt hostname portnumber */#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <netdb.h>#define oops(msg) { perror(msg); exit(1); }main(int ac, char *av[]){ struct sockaddr_in servadd; /* the number to call */ struct hostent *hp; /* used to get number */ int sock_id, sock_fd; /* the socket and fd */ char message[BUFSIZ]; /* to receive message */ int messlen; /* for message length */ /* * Step 1: Get a socket */ sock_id = socket( AF_INET, SOCK_STREAM, 0 ); /* get a line */ if ( sock_id == -1 ) oops( "socket" ); /* or fail */ /* * Step 2: connect to server * need to build address (host,port) of server first */ bzero( &servadd, sizeof( servadd ) ); /* zero the address */ hp = gethostbyname( av[1] ); /* lookup host's ip # */ if (hp == NULL) oops(av[1]); /* or die */ bcopy(hp->h_addr, (struct sockaddr *)&servadd.sin_addr, hp->h_length); servadd.sin_port = htons(atoi(av[2])); /* fill in port number */ servadd.sin_family = AF_INET ; /* fill in socket type */ /* now dial */ if ( connect(sock_id,(struct sockaddr *)&servadd, sizeof(servadd)) !=0) oops( "connect" ); /* * Step 3: transfer data from server, then hangup */ messlen = read(sock_id, message, BUFSIZ); /* read stuff */ if ( messlen == - 1 ) oops("read") ; if ( write( 1, message, messlen ) != messlen ) /* and write to */ oops( "write" ); /* stdout */ close( sock_id ); }
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