Fix asynchrounous GnuTLS socket handling on some versions of the GnuTLS library.

Some versions of the GnuTLS library doesn't respons to poll reliably.
Work around this by checking all GnuTLS sockets explicitly from the
idle loop.

src/ChangeLog

+2011-11-21  Lars Magne Ingebrigtsen  <larsi@gnus.org>
+
+	* process.c (wait_reading_process_output): Fix asynchrounous
+	GnuTLS socket handling on some versions of the GnuTLS library.
+
 2011-11-21  Jan Djärv  <jan.h.d@swipnet.se>
 
 	* xterm.c (x_clear_frame): Reinstate the XClearWindow call.

src/process.c

@@ -4620,15 +4620,39 @@ wait_reading_process_output (int time_limit, int microsecs, int read_kbd,
              some data in the TCP buffers so that select works, but
              with custom pull/push functions we need to check if some
              data is available in the buffers manually.  */
-          if (nfds == 0 &&
-              wait_proc && wait_proc->gnutls_p /* Check for valid process.  */
-              /* Do we have pending data?  */
-              && emacs_gnutls_record_check_pending (wait_proc->gnutls_state) > 0)
-          {
-              nfds = 1;
-              /* Set to Available.  */
-              FD_SET (wait_proc->infd, &Available);
-          }
+          if (nfds == 0)
+	    {
+	      if (! wait_proc)
+		{
+		  /* We're not waiting on a specific process, so loop
+		     through all the channels and check for data. */
+		  struct Lisp_Process *proc;
+		  for (channel = 0; channel < MAXDESC; ++channel)
+		    {
+		      if (! NILP (chan_process[channel]) &&
+			  (proc = XPROCESS (chan_process[channel])) != NULL &&
+			  proc->gnutls_p &&
+			  proc->infd &&
+			  emacs_gnutls_record_check_pending (proc->gnutls_state) > 0)
+			{
+			  nfds++;
+			  FD_SET (proc->infd, &Available);
+			}
+		    }
+		}
+	      else
+		{
+		  /* Check this specific channel. */
+		  if (wait_proc->gnutls_p && /* Check for valid process.  */
+		      /* Do we have pending data?  */
+		      emacs_gnutls_record_check_pending (wait_proc->gnutls_state) > 0)
+		    {
+		      nfds = 1;
+		      /* Set to Available.  */
+		      FD_SET (wait_proc->infd, &Available);
+		    }
+		}
+	    }
 #endif
 	}