From b247ac086e60a6cee99ea1989277c5c66b0541de Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 6 May 2020 13:13:10 +0900
Subject: [PATCH] Ignore FDs kept by system library

`getaddrinfo` on macOS seems keeping FDs to query host names
internally.
---
 tool/lib/leakchecker.rb | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tool/lib/leakchecker.rb b/tool/lib/leakchecker.rb
index 293ebe6a9a..bd0e24ba2e 100644
--- a/tool/lib/leakchecker.rb
+++ b/tool/lib/leakchecker.rb
@@ -89,6 +89,19 @@ class LeakChecker
           }.sort.each {|s|
             str << s
           }
+        else
+          begin
+            io = IO.for_fd(fd, autoclose: false)
+            s = io.stat
+          rescue Errno::EBADF
+            # something un-stat-able
+            next
+          else
+            next if /darwin/ =~ RUBY_PLATFORM and [0, -1].include?(s.dev)
+            str << ' ' << s.inspect
+          ensure
+            io.close
+          end
         end
         puts "Leaked file descriptor: #{test_name}: #{fd}#{str}"
         puts "  The IO was created at #{pos}" if pos