rev: avoid unnecessary seeking when using sendfile

There's no need to ever change the underlying offset of a file
descriptor when using sendfile(), so don't.  This allows us to
avoid contention in the kernel/filesystem and eventually reuse
the same filesystem file descriptor for serving multiple
requests.

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/rainbows/rev/client.rb b/lib/rainbows/rev/client.rb
index 68b3847..e0572bb 100644
--- a/lib/rainbows/rev/client.rb
+++ b/lib/rainbows/rev/client.rb
@@ -86,6 +86,7 @@ module Rainbows
         elsif st.file?
           headers.delete('Transfer-Encoding')
           headers['Content-Length'] ||= st.size.to_s
+          io = to_sendfile(io)
         else # char/block device, directory, whatever... nobody cares
           return write_response(self, response, out)
         end