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-rw-r--r--lib/yahns/http_response.rb21
1 files changed, 20 insertions, 1 deletions
diff --git a/lib/yahns/http_response.rb b/lib/yahns/http_response.rb
index 65ecdff..e257feb 100644
--- a/lib/yahns/http_response.rb
+++ b/lib/yahns/http_response.rb
@@ -32,6 +32,20 @@ module Yahns::HttpResponse # :nodoc:
   R100_CCC = "100 Continue\r\n\r\nHTTP/1.1 "
   HTTP_EXPECT = "HTTP_EXPECT"
 
+  # no point in using one without the other, these have been in Linux
+  # for ages
+  if Socket.const_defined?(:MSG_MORE) && Socket.const_defined?(:MSG_DONTWAIT)
+    MSG_MORE = Socket::MSG_MORE
+    MSG_DONTWAIT = Socket::MSG_DONTWAIT
+  else
+    MSG_MORE = 0
+    MSG_DONTWAIT = 0
+
+    def kgio_syssend(buf, flags)
+      kgio_trywrite(buf)
+    end
+  end
+
   def response_start
     @response_start_sent ? Z : RESPONSE_START
   end
@@ -117,6 +131,7 @@ module Yahns::HttpResponse # :nodoc:
     count = hijack = nil
     k = self.class
     alive = @hs.next? && k.persistent_connections
+    flags = MSG_DONTWAIT
 
     if @hs.headers?
       buf = "#{response_start}#{status}\r\nDate: #{httpdate}\r\n"
@@ -133,6 +148,9 @@ module Yahns::HttpResponse # :nodoc:
         when %r{\AConnection\z}i
           # allow Rack apps to tell us they want to drop the client
           alive = false if value =~ /\bclose\b/i
+        when %r{\AContent-Length\z}i
+          flags |= MSG_MORE
+          buf << kv_str(key, value)
         when "rack.hijack"
           hijack = value
           body = nil # ensure we do not close body
@@ -141,10 +159,11 @@ module Yahns::HttpResponse # :nodoc:
         end
       end
       buf << (alive ? CONN_KA : CONN_CLOSE)
-      case rv = kgio_trywrite(buf)
+      case rv = kgio_syssend(buf, flags)
       when nil # all done, likely
         break
       when String
+        flags = MSG_DONTWAIT
         buf = rv # hope the skb grows
       when :wait_writable, :wait_readable
         if k.output_buffering