$OpenBSD: patch-lib_awful_util_lua_in,v 1.2 2010/06/02 15:15:11 dcoppa Exp $

XXX THIS IS A HACK
This is needed to workaround the effects of userland 
threads which change I/O operations to non-blocking.

--- lib/awful/util.lua.in.orig	Tue Mar  2 17:54:05 2010
+++ lib/awful/util.lua.in	Wed Jun  2 17:13:40 2010
@@ -88,18 +88,46 @@ function spawn_with_shell(cmd, screen)
     end
 end
 
+local function read_all(fn)
+    local fd = io.open(fn, _OPEN_RT)
+    if not fd then return nil end
+    local str = fd:read'*a'
+    fd:close()
+    return str
+end
+
 --- Read a program output and returns its output as a string.
 -- @param cmd The command to run.
 -- @return A string with the program output, or the error if one occured.
 function pread(cmd)
     if cmd and cmd ~= "" then
-        local f, err = io.popen(cmd, 'r')
-        if f then
-            local s = f:read("*all")
-            f:close()
-            return s
+        local rc, sout
+        local tmp1, tmp2
+        local fd_check, serr_check
+
+        tmp1 = os.tmpname()
+        tmp2 = os.tmpname()
+
+        rc = os.execute(cmd.." > "..tmp1.." 2> "..tmp2)
+
+        if rc == 0 then
+            sout = read_all(tmp1)
         else
-            return err
+            return nil
+        end
+
+        fd_check = io.open(tmp2)
+        if not fd_check then return nil end
+        serr_check = fd_check:read'*l'
+        fd_check:close()
+
+        os.remove(tmp1)
+        os.remove(tmp2)
+
+        if serr_check then
+            return nil
+        else
+            return sout
         end
     end
 end