recommended process after selection , select (), poll on socket.

loof
[

1 FD_ZERO(&readfds);

2 FD_SET after bind all about socket.
 
3 process after select  ()

if (ret < 0)
{
  // error
  break;
}
else if (ret == 0)
{
  // timeout
 break;
}
else if (ret > 0)
{
 // normal
 }

4 rtn = FD_ISSET()
rtn < 0
    error will close socket
rtn = 0
    Gracefully Close
    socket be disconnected by another user.
rtn > 0
    received Byte number, socket reading possible .
   


5 ACCEPT