From 21f10fd262328f4fab232daa133fc7f6da92b065 Mon Sep 17 00:00:00 2001
From: AZero13 <gfunni234@gmail.com>
Date: Tue, 9 Dec 2025 15:23:49 -0500
Subject: [PATCH] gh-142490: for macOS, use vm_page_size directly from the
 kernel header

We do not need to call sysconf for this at all.
---
 .../Library/2025-12-09-15-26-02.gh-issue-142490.-ov3D8.rst | 2 ++
 Modules/_ctypes/malloc_closure.c                           | 7 ++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2025-12-09-15-26-02.gh-issue-142490.-ov3D8.rst

diff --git a/Misc/NEWS.d/next/Library/2025-12-09-15-26-02.gh-issue-142490.-ov3D8.rst b/Misc/NEWS.d/next/Library/2025-12-09-15-26-02.gh-issue-142490.-ov3D8.rst
new file mode 100644
index 00000000000000..d770c5812e7703
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-12-09-15-26-02.gh-issue-142490.-ov3D8.rst
@@ -0,0 +1,2 @@
+It comes straight from the mach header as a global variable. No need to call
+to get it.
diff --git a/Modules/_ctypes/malloc_closure.c b/Modules/_ctypes/malloc_closure.c
index 62c7aa5d6affbf..4b230bb8522072 100644
--- a/Modules/_ctypes/malloc_closure.c
+++ b/Modules/_ctypes/malloc_closure.c
@@ -12,6 +12,9 @@
 #  if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
 #    define MAP_ANONYMOUS MAP_ANON
 #  endif
+#  if defined(__APPLE__)
+#    include <mach/vm_page_size.h>
+#  endif
 #endif
 #include "ctypes.h"
 #include "pycore_mmap.h"          // _PyAnnotateMemoryMap()
@@ -55,7 +58,9 @@ static void more_core(void)
     }
 #else
     if (!_pagesize) {
-#ifdef _SC_PAGESIZE
+#ifdef __APPLE__
+        _pagesize = vm_page_size;
+#elif defined(_SC_PAGESIZE)
         _pagesize = sysconf(_SC_PAGESIZE);
 #else
         _pagesize = getpagesize();