From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Thu, 5 Mar 2026 14:34:49 +0000 (+0100)
Subject: [3.13] gh-143304: Fix ctypes.CDLL to honor handle parameter on POSIX systems (GH... 
X-Git-Tag: v3.13.13~132
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8fab30ed1125f020f3a050c1a055d3ffcd816811;p=thirdparty%2FPython%2Fcpython.git

[3.13] gh-143304: Fix ctypes.CDLL to honor handle parameter on POSIX systems (GH-143318) (GH-145173)

The handle parameter was being ignored in the POSIX implementation
of CDLL._load_library(), causing it to always call _dlopen() even
when a valid handle was provided. This was a regression introduced
in recent refactoring.
(cherry picked from commit 27ded243485670fa836c9bb421e37a6ef16eca8e)

Co-authored-by: Arjit Singh Grover <143692910+Koolvansh07@users.noreply.github.com>
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
---

diff --git a/Lib/ctypes/__init__.py b/Lib/ctypes/__init__.py
index 80651dc64ce7..7fc1181f25a2 100644
--- a/Lib/ctypes/__init__.py
+++ b/Lib/ctypes/__init__.py
@@ -398,6 +398,8 @@ class CDLL(object):
                 if name and name.endswith(")") and ".a(" in name:
                     mode |= _os.RTLD_MEMBER | _os.RTLD_NOW
             self._name = name
+            if handle is not None:
+                return handle
             return _dlopen(name, mode)
 
     def __repr__(self):
diff --git a/Lib/test/test_ctypes/test_loading.py b/Lib/test/test_ctypes/test_loading.py
index a4d54f676a6d..dc10d61f2bc6 100644
--- a/Lib/test/test_ctypes/test_loading.py
+++ b/Lib/test/test_ctypes/test_loading.py
@@ -106,6 +106,14 @@ class LoaderTest(unittest.TestCase):
         lib = ctypes.WinDLL(name=None, handle=handle)
         self.assertIs(handle, lib._handle)
 
+    @unittest.skipIf(os.name == "nt", 'POSIX-specific test')
+    @unittest.skipIf(libc_name is None, 'could not find libc')
+    def test_load_without_name_and_with_handle_posix(self):
+        lib1 = CDLL(libc_name)
+        handle = lib1._handle
+        lib2 = CDLL(name=None, handle=handle)
+        self.assertIs(lib2._handle, handle)
+
     @unittest.skipUnless(os.name == "nt", 'Windows-specific test')
     def test_1703286_A(self):
         # On winXP 64-bit, advapi32 loads at an address that does
diff --git a/Misc/NEWS.d/next/Library/2026-01-01-05-26-00.gh-issue-143304.Kv7x9Q.rst b/Misc/NEWS.d/next/Library/2026-01-01-05-26-00.gh-issue-143304.Kv7x9Q.rst
new file mode 100644
index 000000000000..826b2e9a126d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-01-01-05-26-00.gh-issue-143304.Kv7x9Q.rst
@@ -0,0 +1 @@
+Fix :class:`ctypes.CDLL` to honor the ``handle`` parameter on POSIX systems.