Fix test.support.bind_port() to not cause an error when Python was compiled

on a system with SO_REUSEPORT defined in the headers but run on a system
with an OS kernel that does not support that reasonably new socket option.

1 files changed, 9 insertions, 3 deletions

diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index 20a5e85..b6a430e 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -594,9 +594,15 @@ def bind_port(sock, host=HOST):
                 raise TestFailed("tests should never set the SO_REUSEADDR "   \
                                  "socket option on TCP/IP sockets!")
         if hasattr(socket, 'SO_REUSEPORT'):
-            if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
-                raise TestFailed("tests should never set the SO_REUSEPORT "   \
-                                 "socket option on TCP/IP sockets!")
+            try:
+                if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
+                    raise TestFailed("tests should never set the SO_REUSEPORT "   \
+                                     "socket option on TCP/IP sockets!")
+            except OSError:
+                # Python's socket module was compiled using modern headers
+                # thus defining SO_REUSEPORT but this process is running
+                # under an older kernel that does not support SO_REUSEPORT.
+                pass
         if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
             sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)