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

#define SERVER_PORT 1966
#define MAX_PENDING 5
#define MAX_LINE 256

int main()
{
  struct sockaddr_in sin;
  char buf[MAX_LINE];
  int len;
  int s, new_s;


   /*build address data structure of INADDR(all interfaces) paired with SERVER PORT  */
   bzero( (char*)&sin, sizeof(sin) );
   sin.sin_family = AF_INET;
   sin.sin_addr.s_addr = INADDR_ANY;
   sin.sin_port = htons( SERVER_PORT );



   /*setup passive open */
   if( (s = socket(PF_INET, SOCK_STREAM, 0) ) <  0)
        {
           perror( "simplex-talk: socket" );
           exit(1);
        }
   
   /*binds the address structure(actually the local port) behind the process*/  
   if ((bind( s, (struct sockaddr *)&sin, sizeof(sin) )) < 0 )
   {
        perror( "simplex-talk; bind" );
        exit(1);
   }

   /*specifies a queue(of maximum size MAX_PENDING) for incoming connections on socket s*/
   listen( s, MAX_PENDING );
   fputs("I am listening:\n", stdout);

   /*waits for and accepts connection, then receive and print text */
   while(1)
   {
      if( (new_s = accept( s, (struct sockaddr *)&sin, &len )) < 0 )
      {
        perror( "simplex-talk: accept" );
        exit(1);
      }

      while( len = recv( new_s, buf, sizeof(buf), 0 ) )
      {
          fputs(buf, stdout);
        
      }       
      close( new_s );
   }
}//end main