Remove duplicate set_cloexec calls everywhere

Now it's handled in Side() constructor, it can disappear elsewhere.

mitogen/core.py

@@ -844,8 +844,6 @@ class Stream(BasicStream):
         # TODO: what is this os.dup for?
         self.receive_side = Side(self, os.dup(rfd))
         self.transmit_side = Side(self, os.dup(wfd))
-        set_cloexec(self.receive_side.fd)
-        set_cloexec(self.transmit_side.fd)
 
     def __repr__(self):
         cls = type(self)
@@ -1025,8 +1023,6 @@ class Waker(BasicStream):
     def __init__(self, broker):
         self._broker = broker
         rfd, wfd = os.pipe()
-        set_cloexec(rfd)
-        set_cloexec(wfd)
         self.receive_side = Side(self, rfd)
         self.transmit_side = Side(self, wfd)
 

mitogen/fakessh.py

@@ -322,7 +322,6 @@ def run(dest, router, args, deadline=None, econtext=None):
     fakessh.name = 'fakessh.%d' % (context_id,)
 
     sock1, sock2 = socket.socketpair()
-    mitogen.core.set_cloexec(sock1.fileno())
 
     stream = mitogen.core.Stream(router, context_id)
     stream.name = 'fakessh'

mitogen/unix.py

@@ -74,9 +74,6 @@ class Listener(mitogen.core.BasicStream):
         self._sock.bind(self.path)
         os.chmod(self.path, 0600)
         self._sock.listen(backlog)
-        mitogen.core.set_nonblock(self._sock.fileno())
-        mitogen.core.set_cloexec(self._sock.fileno())
-        self.path = self._sock.getsockname()
         self.receive_side = mitogen.core.Side(self, self._sock.fileno())
         router.broker.start_receive(self)