From 670bef2d339a1e4c4e204e739663f5ae4014ca1f Mon Sep 17 00:00:00 2001
From: Don Stewart <dons@cse.unsw.edu.au>
Date: Mon, 12 Mar 2007 07:26:12 +0100
Subject: catch exceptions in spawn, so failing to fork won't kill the wm

darcs-hash:20070312062612-9c5c1-bd010ffbd84cfe17ec71b264c390ab030b6b4a6c
---
 XMonad.hs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/XMonad.hs b/XMonad.hs
index 24c7899..a628fd0 100644
--- a/XMonad.hs
+++ b/XMonad.hs
@@ -26,6 +26,7 @@ import Control.Monad.State
 import System.IO
 import System.Process (runCommand)
 import Graphics.X11.Xlib
+import Control.Exception
 
 -- | XState, the window manager state.
 -- Just the display, width, height and a window list
@@ -72,7 +73,8 @@ io = liftIO
 
 -- | spawn. Launch an external application
 spawn :: String -> X ()
-spawn x = io (runCommand x) >> return ()
+spawn x = do v <- io $ handle (return . Just) (runCommand x >> return Nothing)
+             whenJust v $ \e -> trace $ "xmonad:spawn: unable to fork "++show x++": "++show e
 
 -- | Run a side effecting action with the current workspace. Like 'when' but
 whenJust :: Maybe a -> (a -> X ()) -> X ()
-- 
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