Revert r62152 (Issue #2550). Being able to observe the results of all the buildbots was certainly useful. All of the platforms that have some form of BSD lineage -- FreeBSD, OS X, Solaris and Tru64 -- all pass the test. Windows and Linux, on the other hand, don't. Windows I knew about, Linux was a surprise. Knowing this, I believe a more appropriate fix will revolve around test_support.bind_socket() -- this method needs to return a port that nothing in the system has bound already. The best way to do this may just be to rely on ephemeral ports, rather than having the user specify a desired port, then fall back to four random ports, then try 0.

Lib/test/test_socket.py

@@ -3,7 +3,6 @@
 import unittest
 from test import test_support
 
-import errno
 import socket
 import select
 import thread, threading
@@ -487,81 +486,6 @@ class GeneralModuleTests(unittest.TestCase):
         reuse = sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR)
         self.failIf(reuse == 0, "failed to set reuse mode")
 
-    def testAddressReuseSemantics(self):
-        # As per the 'SO_REUSEADDR and SO_REUSEPORT Socket Options' section in
-        # chapter 7.5 of Stevens' UNIX Network Programming Volume 1 (2nd Ed):
-        #
-        #   "With TCP, we are never able to start multiple servers that bind
-        #    the same IP address and same port: a completely duplicate binding.
-        #    That is, we cannot start one server that binds 198.69.10.2 port 80
-        #    and start another that also binds 198.69.10.2 port 80, even if we
-        #    set the SO_REUSEADDR socket option for the second server."
-        #
-        # However, on Windows, it seems that if SO_REUSEADDR is set on the 2nd
-        # socket, binding to an already bound (host, port) combination doesn't
-        # raise an exception.  Instead, it causes Python to wedge pretty badly
-        # when accept() is called against either of the sockets. This test case
-        # is being added to help debug this issue, as well as seeing if the
-        # expected semantics differ on any other platforms.
-
-        # Get a port that we *know* is unique.  Don't rely on test_support's
-        # bind_port method, as this operates under the assumption that an
-        # EADDRINUSE exception will be raised correctly, which is exactly what
-        # we're trying to test here.
-        host = '127.0.0.1'
-        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-        sock.bind((host, 0))
-        port = sock.getsockname()[1]
-        sock.close()
-        del sock
-
-        # First test that we get EADDRINUSE without SO_REUSEADDR.
-        sock1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-        sock1.bind((host, port))
-        sock2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-        try:
-            sock2.bind((host, port))
-        except socket.error, (err, msg):
-            self.assertEqual(err, errno.EADDRINUSE)
-        else:
-            self.fail("expected EADDRINUSE socket.error exception to be "    \
-                      "raised when attempting to bind a second socket to "   \
-                      "a (host, port) we've already bound to (SO_REUSEADDR " \
-                      "was NOT set on the socket)")
-        finally:
-            sock1.close()
-            try:
-                sock2.close()
-            except:
-                pass
-            del sock1
-            del sock2
-
-        # Try again with SO_REUSEADDR; the behaviour *should* be identical to
-        # the test above, i.e. an EADDRINUSE socket.error should be raised.
-        sock1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-        sock1.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-        sock1.bind((host, port))
-        sock2 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-        sock2.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-        try:
-            sock2.bind((host, port))
-        except socket.error, (err, msg):
-            self.assertEqual(err, errno.EADDRINUSE)
-        else:
-            self.fail("expected EADDRINUSE socket.error exception to be "    \
-                      "raised when attempting to bind a second socket to "   \
-                      "a (host, port) we've already bound to (SO_REUSEADDR " \
-                      "*WAS* set on the socket)")
-        finally:
-            sock1.close()
-            try:
-                sock2.close()
-            except:
-                pass
-            del sock1
-            del sock2
-
     def testSendAfterClose(self):
         # testing send() after close() with timeout
         sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)