From 078a760999a4ee00f59db3f07047070e71316e13 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 22 May 2006 22:12:57 +0000
Subject: avoid useless fcntl in rb_io_set_nonblock.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@10180 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 io.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'io.c')

diff --git a/io.c b/io.c
index 22257b65ae..83c51f4437 100644
--- a/io.c
+++ b/io.c
@@ -1247,9 +1247,11 @@ void rb_io_set_nonblock(OpenFile *fptr)
 #else
     flags = 0;
 #endif
-    flags |= O_NONBLOCK;
-    if (fcntl(fptr->fd, F_SETFL, flags) == -1) {
-        rb_sys_fail(fptr->path);
+    if ((flags & O_NONBLOCK) == 0) {
+        flags |= O_NONBLOCK;
+        if (fcntl(fptr->fd, F_SETFL, flags) == -1) {
+            rb_sys_fail(fptr->path);
+        }
     }
 }
 
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