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【C】 Linux中客户端时间

作者:晟睿 / 发布于2014/10/21/ 522


	/* 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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　客户端　　时间　

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