From 690a5115679a669240c3132396985db4e7cc5c9a Mon Sep 17 00:00:00 2001
From: stolz <unknown>
Date: Mon, 27 Oct 2003 12:09:44 +0000
Subject: [PATCH] [project @ 2003-10-27 12:09:44 by stolz] Avoid setting
 O_NONBLOCK when already set.

---
 System/Posix/Internals.hs |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/System/Posix/Internals.hs b/System/Posix/Internals.hs
index 7e9e96f..5a1df90 100644
--- a/System/Posix/Internals.hs
+++ b/System/Posix/Internals.hs
@@ -304,7 +304,9 @@ setNonBlockingFD fd = do
   -- An error when setting O_NONBLOCK isn't fatal: on some systems 
   -- there are certain file handles on which this will fail (eg. /dev/null
   -- on FreeBSD) so we throw away the return code from fcntl_write.
-  c_fcntl_write (fromIntegral fd) const_f_setfl (flags .|. o_NONBLOCK)
+  unless (testBit flags (fromIntegral o_NONBLOCK)) $ do
+    c_fcntl_write (fromIntegral fd) const_f_setfl (flags .|. o_NONBLOCK)
+    return ()
 #else
 
 -- bogus defns for win32
-- 
1.7.10.4