From a9648d1e58260d35438d759dccf81cc45be9b45e Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 29 Oct 2011 11:58:30 +0000
Subject: [PATCH] add a comment.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33554 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 io.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/io.c b/io.c
index ddc89cc67e..bde6ff4a36 100644
--- a/io.c
+++ b/io.c
@@ -192,6 +192,7 @@ rb_cloexec_open(const char *pathname, int flags, mode_t mode)
 {
     int ret;
 #ifdef O_CLOEXEC
+    /* O_CLOEXEC is available since Linux 2.6.23.  Linux 2.6.18 silently ignore it. */
     flags |= O_CLOEXEC;
 #endif
     ret = open(pathname, flags, mode);