#include <stdio.h> 
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <netdb.h> 
#define SERVER_PORT 5432 
#define MAX_LINE 256 

int main(int argc, char * argv[]) 
{ 
    struct hostent *hp; 
    struct sockaddr_in sin; 
    char *host; 
    char buf[MAX_LINE]; 
    int s; 
    int len; 
    if (argc==2) { 
	host = argv[1]; 
    } 
    else { 
	fprintf(stderr, "usage: ./client host\n"); 
	exit(1); 
    } 
    /* translate host name into peer's IP address */ 
    hp = gethostbyname(host); 
    if (!hp) { 
	fprintf(stderr, "client: unknown host: %s\n", host); 
	exit(1); 
    } 
    /* build address data structure */ 
    memset((char *)&sin, 0, sizeof(sin)); 
    sin.sin_family = AF_INET; 
    bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length); 
    sin.sin_port = htons(SERVER_PORT); 
    /* active open */ 
    if ((s = socket(PF_INET, SOCK_STREAM, 0)) < 0) { 
	perror("client: socket"); 
	exit(1);
    } 
    if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 
	perror("client: connect"); 
	close(s); 
	exit(1); 
    } 
    /* main loop: get and send lines of text */ 
    while (fgets(buf, sizeof(buf), stdin)) { 
	buf[MAX_LINE-1] = '\0'; 
	len = strlen(buf) + 1; 
	send(s, buf, len, 0); 
    } 
    return 0;
}