From 24176a8d5d98ea7d1eb3971ffb7fad7f9ccd2adb Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 31 Oct 2011 23:24:25 +0000
Subject: [PATCH] add comment.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 io.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/io.c b/io.c
index 7979e2ae08..80e6c28ce1 100644
--- a/io.c
+++ b/io.c
@@ -226,7 +226,7 @@ rb_cloexec_dup2(int oldfd, int newfd)
             ret = dup3(oldfd, newfd, O_CLOEXEC);
             if (ret != -1)
                 return ret;
-            /* dup3 is available since Linux 2.6.27. */
+            /* dup3 is available since Linux 2.6.27, glibc 2.9. */
             if (errno == ENOSYS) {
                 try_dup3 = 0;
                 ret = dup2(oldfd, newfd);
@@ -261,7 +261,7 @@ rb_cloexec_pipe(int fildes[2])
         if (ret != -1)
             return ret;
 #endif
-        /* pipe2 is available since Linux 2.6.27. */
+        /* pipe2 is available since Linux 2.6.27, glibc 2.9. */
         if (errno == ENOSYS) {
             try_pipe2 = 0;
             ret = pipe(fildes);