add "copy_stream" config directive

This allows using IO::Splice.copy_stream from the "io_splice"
RubyGem on recent Linux systems.  This also allows users to
disable copy_stream usage entirely and use traditional
response_body.each calls which are compatible with all Rack
servers (to workaround bugs in IO.copy_stream under 1.9.2-p180).

1 files changed, 6 insertions, 1 deletions

diff --git a/t/test_isolate.rb b/t/test_isolate.rb
index 3cc646f..fe2aebc 100644
--- a/t/test_isolate.rb
+++ b/t/test_isolate.rb
@@ -37,7 +37,12 @@ Isolate.now!(opts) do
     gem 'rack-fiber_pool', '0.9.1'
   end
 
-  gem 'sleepy_penguin', '2.0.0' if RUBY_PLATFORM =~ /linux/
+  if RUBY_PLATFORM =~ /linux/
+    gem 'sleepy_penguin', '2.0.0'
+
+    # is 2.6.32 new enough?
+    gem 'io_splice', '4.1.0' if `uname -r`.strip > '2.6.32'
+  end
 end
 
 $stdout.reopen(old_out)