From f0353afdc1f94393338ac07ed2dc02c71ed951c5 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 21 Jul 2011 12:02:45 +0000
Subject: [PATCH] * ext/socket/ancdata.c (discard_cmsg): workaround for MacOS X
 Lion.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@32598 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog            |  5 +++++
 ext/socket/ancdata.c | 12 ++++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 53a93735eb..ef890d1f71 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Jul 21 20:59:59 2011  Tanaka Akira  <akr@fsij.org>
+
+	* ext/socket/ancdata.c (discard_cmsg): workaround for MacOS X Lion.
+
+
 Thu Jul 21 07:07:57 2011  Tanaka Akira  <akr@fsij.org>
 
 	* backport r32579, r32581, r32587 by akr and r32588 by kazu.
diff --git a/ext/socket/ancdata.c b/ext/socket/ancdata.c
index 89a8921414..61e0576e6b 100644
--- a/ext/socket/ancdata.c
+++ b/ext/socket/ancdata.c
@@ -1384,8 +1384,16 @@ discard_cmsg(struct cmsghdr *cmh, char *msg_end)
         int *end = (int *)((char *)cmh + cmh->cmsg_len);
         while ((char *)fdp + sizeof(int) <= (char *)end &&
                (char *)fdp + sizeof(int) <= msg_end) {
-            rb_update_max_fd(*fdp);
-            close(*fdp);
+            /*
+             * xxx: nagachika said *fdp can be invalid fd on MacOS X Lion.
+             * This workaround using fstat is clearly wrong.
+             * we should investigate why *fdp contains invalid fd.
+             */
+            struct stat buf;
+            if (fstat(*fdp, &buf) == 0) {
+                rb_update_max_fd(*fdp);
+                close(*fdp);
+            }
             fdp++;
         }
     }