#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

int
main()
{
 int sock0;
 struct sockaddr_in addr;
 struct sockaddr_in client;
 int len;
 int sock;

 sock0 = socket(AF_INET, SOCK_STREAM, 0);

 addr.sin_family = AF_INET;
 addr.sin_port = htons(51237);
 addr.sin_addr.s_addr = INADDR_ANY;

 bind(sock0, (struct sockaddr *)&addr, sizeof(addr));

 listen(sock0, 5);

 while (1) {
   len = sizeof(client);
   sock = accept(sock0, (struct sockaddr *)&client, &len);
   printf("%d\n",sock);
   write(sock, "HELLO", 5);

   close(sock);
 }

 close(sock0);

 return 0;
}