gh-155621: Fix unrepresentable defaults in socket.sendmsg() signature (#155623)

https://github.com/python/cpython/commit/e5556cdf71f7f5561fcaca21f6e680ebdd44cffb
commit: e5556cdf71f7f5561fcaca21f6e680ebdd44cffb
branch: main
author: stevens <[email protected]>
committer: kumaraditya303 <[email protected]>
date: 2026-08-14T15:33:42Z
summary:

gh-155621: Fix unrepresentable defaults in socket.sendmsg() signature (#155623)

files:
M Lib/test/test_inspect/test_inspect.py
M Modules/clinic/socketmodule.c.h
M Modules/socketmodule.c

diff --git a/Lib/test/test_inspect/test_inspect.py b/Lib/test/test_inspect/test_inspect.py
index 76c346cd89eac04..ff7475447e95a03 100644
--- a/Lib/test/test_inspect/test_inspect.py
+++ b/Lib/test/test_inspect/test_inspect.py
@@ -6340,7 +6340,7 @@ def test_socket_module_has_signatures(self):
         # depends on the number of the arguments.
         methods_no_signature = {'ioctl', 'sendto', 'setsockopt'}
         # These have parameters with unrepresentable default values.
-        methods_unsupported_signature = {'listen', 'sendmsg', 'sendmsg_afalg'}
+        methods_unsupported_signature = {'listen', 'sendmsg_afalg'}
         defined = vars(socket.SocketType).keys()
         self._test_module_has_signatures(socket,
                 no_signature, unsupported_signature,
diff --git a/Modules/clinic/socketmodule.c.h b/Modules/clinic/socketmodule.c.h
index 00e5fb4cde3aefd..f89b91b9b997532 100644
--- a/Modules/clinic/socketmodule.c.h
+++ b/Modules/clinic/socketmodule.c.h
@@ -1018,8 +1018,7 @@ _socket_socket_sendall(PyObject *s, PyObject *const *args, Py_ssize_t nargs)
 #if defined(CMSG_LEN)
 
 PyDoc_STRVAR(_socket_socket_sendmsg__doc__,
-"sendmsg($self, buffers, ancdata=<unrepresentable>, flags=0,\n"
-"        address=<unrepresentable>, /)\n"
+"sendmsg($self, buffers, ancdata=(), flags=0, address=None, /)\n"
 "--\n"
 "\n"
 "Send normal and ancillary data to the socket.\n"
@@ -2479,4 +2478,4 @@ _socket_CMSG_SPACE(PyObject *module, PyObject *arg)
 #ifndef _SOCKET_CMSG_SPACE_METHODDEF
     #define _SOCKET_CMSG_SPACE_METHODDEF
 #endif /* !defined(_SOCKET_CMSG_SPACE_METHODDEF) */
-/*[clinic end generated code: output=133662a8c304b1b7 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=acc30d6fdeb54e90 input=a9049054013a1b77]*/
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 9051420179aea11..70d3738b176cda2 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -4990,9 +4990,9 @@ sock_sendmsg_impl(PySocketSockObject *s, void *data)
 _socket.socket.sendmsg
     self as s: self(type="PySocketSockObject *")
     buffers as data_arg: object
-    ancdata as cmsg_arg: object = NULL
+    ancdata as cmsg_arg: object(c_default="NULL") = ()
     flags: int = 0
-    address as addr_arg: object = NULL
+    address as addr_arg: object(c_default="NULL") = None
     /
 
 Send normal and ancillary data to the socket.
@@ -5016,7 +5016,7 @@ static PyObject *
 _socket_socket_sendmsg_impl(PySocketSockObject *s, PyObject *data_arg,
                             PyObject *cmsg_arg, int flags,
                             PyObject *addr_arg)
-/*[clinic end generated code: output=3b4cb1110644ce39 input=8ae408971a3aa329]*/
+/*[clinic end generated code: output=3b4cb1110644ce39 input=5fdf9b49bed3848b]*/
 
 {
     Py_ssize_t i, ndatabufs = 0, ncmsgs, ncmsgbufs = 0;

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