Update EbuildIpcDaemon to open files as non-blocking.

pym/_emerge/EbuildIpcDaemon.py

Index: pym/_emerge/EbuildIpcDaemon.py
diff --git a/pym/_emerge/EbuildIpcDaemon.py b/pym/_emerge/EbuildIpcDaemon.py
index efcda93169ebb5d9161f7f2111e88d7f35a55b6f..0ff29cbe33296e8872bfd648d30e3ccaa52ee593 100644
--- a/pym/_emerge/EbuildIpcDaemon.py
+++ b/pym/_emerge/EbuildIpcDaemon.py
@@ -84,6 +84,6 @@ class EbuildIpcDaemon(FifoIpcDaemon):
 	def _send_reply(self, reply):
 		# File streams are in unbuffered mode since we do atomic
 		# read and write of whole pickles.
-		output_file = open(self.output_fifo, 'wb', 0)
-		output_file.write(pickle.dumps(reply))
-		output_file.close()
+		output_file = os.open(self.output_fifo, os.O_WRONLY | os.O_NONBLOCK)
+		os.write(output_file, pickle.dumps(reply))
+		os.close(output_file)