Issue #8576: logging updated to remove usage of find_unused_port().

Lib/logging/config.py

@@ -873,6 +873,8 @@ def listen(port=DEFAULT_LOGGING_CONFIG_PORT):
         def run(self):
             server = self.rcvr(port=self.port, handler=self.hdlr,
                                ready=self.ready)
+            if self.port == 0:
+                self.port = server.server_address[1]
             self.ready.set()
             global _listener
             logging._acquireLock()

Lib/test/test_logging.py

@@ -38,8 +38,7 @@ from SocketServer import ThreadingTCPServer, StreamRequestHandler
 import struct
 import sys
 import tempfile
-from test.test_support import captured_stdout, run_with_locale, run_unittest,\
+from test.test_support import captured_stdout, run_with_locale, run_unittest
-     find_unused_port
 import textwrap
 import unittest
 import warnings
@@ -1664,10 +1663,12 @@ class ConfigDictTest(BaseTest):
 
     @unittest.skipUnless(threading, 'listen() needs threading to work')
     def setup_via_listener(self, text):
-        port = find_unused_port()
+        # Ask for a randomly assigned port (by using port 0)
-        t = logging.config.listen(port)
+        t = logging.config.listen(0)
         t.start()
         t.ready.wait()
+        # Now get the port allocated
+        port = t.port
         t.ready.clear()
         try:
             sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

Misc/NEWS

@@ -31,6 +31,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #8576: logging updated to remove usage of find_unused_port().
+
 - Issue #4687: Fix accuracy of garbage collection runtimes displayed with
   gc.DEBUG_STATS.