os.dup()-then-close() can be replaced with detach()
diff --git a/Lib/multiprocessing/connection.py b/Lib/multiprocessing/connection.py
index afd580b..415e210 100644
--- a/Lib/multiprocessing/connection.py
+++ b/Lib/multiprocessing/connection.py
@@ -469,10 +469,8 @@
'''
if duplex:
s1, s2 = socket.socketpair()
- c1 = Connection(os.dup(s1.fileno()))
- c2 = Connection(os.dup(s2.fileno()))
- s1.close()
- s2.close()
+ c1 = Connection(s1.detach())
+ c2 = Connection(s2.detach())
else:
fd1, fd2 = os.pipe()
c1 = Connection(fd1, writable=False)