* cygthread.cc (cygthread::detach): Make error message a little more detailed.

* fhandler.cc (fhandler_base::raw_read): Ditto for debug message.
* dcrt0.cc (do_exit): Add some more synchronization tests.
* fhandler_fifo.cc (fhandler_fifo::dup): Don't duplicate a nonexistent handle.
Use derived return value rather than always retuning 0.
* fhandler_netdrive.cc (fhandler_netdrive::exists): Wnet -> WNet.
* winsup.h (exit_states): Add a couple of new exit states.

winsup/cygwin/fhandler.cc

@@ -269,7 +269,7 @@ fhandler_base::raw_read (void *ptr, size_t& ulen)
 	      break;
 	    }
 	default:
-	  syscall_printf ("ReadFile %s failed, %E", get_name ());
+	  syscall_printf ("ReadFile %s(%p) failed, %E", get_name (), get_handle ());
 	  __seterrno_from_win_error (errcode);
 	  bytes_read = (size_t) -1;
 	  break;