Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!oliveb!ames!sgi!arisia!janssen@holmes
From: janssen@holmes (Bill Janssen)
Newsgroups: comp.windows.x
Subject: Re: Xlib not seeing net connection drop?
Message-ID: <1379@arisia.Xerox.COM>
Date: 25 Jun 89 22:33:02 GMT
References: <8906251323.AA27600@Larry.McRCIM.McGill.EDU>
Sender: news@arisia.Xerox.COM
Reply-To: janssen@holmes (Bill Janssen)
Organization: PARC.Xerox.COM
Lines: 39
In-reply-to: mouse@LARRY.MCRCIM.MCGILL.EDU (der Mouse)

You might try looking for bytes on the wire, thusly:

	while (1)
	 { if (XQLength(disp) > 0)
	    { read events and act on them
	    }
	   choose a timeout for the select - see below
	   call select() on the pty and XConnectionNumber(disp)
	   if (the select timed out)
	    { if (the window needs updating) update it
	      if (there might be stuff to flush to the X server)
	       { XSync(disp,False); /* see below */
	       }
	      continue;
	    }
	   if (select indicates something on the X connection)
	    {
+	      unsigned long count;
+
+	      if (ioctl(ConnectionNumber(disp), FIONREAD, &count) == 0
+		  && count < 1)
+		EOFonXconnectionRoutine();
+	      else
		XEventsQueued(disp,QueuedAfterReading);
	      continue;
	    }
	   if (select indicates something on the pty)
	    { handle stuff on the pty
	    }
	 }

Should work on SunOS 3.5.  Properly speaking, the routine to be called
should handle exceptions on that fd, not just EOF.  Include sys/filio.h
to get the definition of FIONREAD.

Bill
Bill Janssen        janssen@xerox.com      (415) 494-4763
Xerox Palo Alto Research Center
333 Coyote Hill Road, Palo Alto, California   94304