#include <stdio.h> // printf()
#include <stdlib.h> // exit()
#include <string.h> // bzero()
#include <sys/types.h>
#include <sys/socket.h> // socket()
#include <netinet/in.h>
#include <unistd.h>
#define port 21
int main()
{
int servsock, clntsock;
struct sockaddr_in sin, pin;
unsigned int clntlen;
char buf[80];
clntlen = sizeof(pin);
if((servsock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
printf("socket() failed");
exit(1);
}
bzero(&pin, sizeof(pin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
