[Python-checkins] gh-80184: Set getattr(socket, "SOMAXCONN", 5) as the default queue size for TCPServer (GH-134249)

[gpshead]

https://github.com/python/cpython/commit/92f85ff3a07335e32a0e00a55b7b6aaf3657019b
commit: 92f85ff3a07335e32a0e00a55b7b6aaf3657019b
branch: main
author: Sahil Shah <sahildsh...@gmail.com>
committer: gpshead <g...@krypto.org>
date: 2025-05-19T19:28:09Z
summary:

gh-80184: Set getattr(socket, "SOMAXCONN", 5) as the default queue size for 
TCPServer (GH-134249)

socketserver.TCPServer default queue size becomes SOMAXCONN instead of 5 when 
possible.

files:
A Misc/NEWS.d/next/Library/2025-05-19-17-27-21.gh-issue-80184.LOkbaw.rst
M Doc/library/socketserver.rst
M Lib/socketserver.py

diff --git a/Doc/library/socketserver.rst b/Doc/library/socketserver.rst
index 59cfa136a3b7da..753f12460b824b 100644
--- a/Doc/library/socketserver.rst
+++ b/Doc/library/socketserver.rst
@@ -24,6 +24,8 @@ There are four basic concrete server classes:
    :meth:`~BaseServer.server_activate`.  The other parameters are passed to
    the :class:`BaseServer` base class.
 
+   .. versionchanged:: next
+      The default queue size is now ``socket.SOMAXCONN`` for 
:class:`socketserver.TCPServer`.
 
 .. class:: UDPServer(server_address, RequestHandlerClass, 
bind_and_activate=True)
 
diff --git a/Lib/socketserver.py b/Lib/socketserver.py
index 35b2723de3babe..93b0a23be27f68 100644
--- a/Lib/socketserver.py
+++ b/Lib/socketserver.py
@@ -441,7 +441,7 @@ class TCPServer(BaseServer):
 
     socket_type = socket.SOCK_STREAM
 
-    request_queue_size = 5
+    request_queue_size = getattr(socket, "SOMAXCONN", 5)
 
     allow_reuse_address = False
 
diff --git 
a/Misc/NEWS.d/next/Library/2025-05-19-17-27-21.gh-issue-80184.LOkbaw.rst 
b/Misc/NEWS.d/next/Library/2025-05-19-17-27-21.gh-issue-80184.LOkbaw.rst
new file mode 100644
index 00000000000000..089268dc4c3e7b
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-05-19-17-27-21.gh-issue-80184.LOkbaw.rst
@@ -0,0 +1 @@
+The default queue size is now ``socket.SOMAXCONN`` for 
:class:`socketserver.TCPServer`.

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