in case the select() returns -1 and errno is EINTR, it should not abort

      switch (select (maxfd, &readfd, &writefd, NULL, &interval)) {

      case -1:			/* select() error, stop reading */

#ifdef EINTR

        /* The EINTR is not serious, and it seems you might get this more

           ofen when using the lib in a multi-threaded environment! */

        if(errno == EINTR)

          ;

        else

#endif

          keepon = 0; /* no more read or write */

	continue;

      case 0:			/* timeout */