From 80f6a9c643f56521731a7f51b65100fbc8913c39 Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Thu, 10 Jan 2013 01:20:05 +0100
Subject: [PATCH] unix: omit second fcntl() call if possible

Omit the fcntl() syscall when the O_NONBLOCK or FD_CLOEXEC is already
set/clear because it's a no-op in that case.
---
 src/unix/core.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/unix/core.c b/src/unix/core.c
index 1154fa25..b4cb948b 100644
--- a/src/unix/core.c
+++ b/src/unix/core.c
@@ -444,6 +444,10 @@ int uv__nonblock(int fd, int set) {
   if (r == -1)
     return -1;
 
+  /* Bail out now if already set/clear. */
+  if (!!(r & O_NONBLOCK) == !!set)
+    return 0;
+
   if (set)
     flags = r | O_NONBLOCK;
   else
@@ -468,6 +472,10 @@ int uv__cloexec(int fd, int set) {
   if (r == -1)
     return -1;
 
+  /* Bail out now if already set/clear. */
+  if (!!(r & FD_CLOEXEC) == !!set)
+    return 0;
+
   if (set)
     flags = r | FD_CLOEXEC;
   else