From 83891ed63e15cf44f4d1cb8bf7286441c34111d6 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 25 Jan 2023 09:13:00 +0530
Subject: [PATCH] Code to get the memory address of a SharedMemory object

---
 src/calibre/utils/shm.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/calibre/utils/shm.py b/src/calibre/utils/shm.py
index abb083c75a..6857b18a44 100644
--- a/src/calibre/utils/shm.py
+++ b/src/calibre/utils/shm.py
@@ -132,6 +132,15 @@ class SharedMemory:
 
         self._size = size
 
+    @property
+    def memory_address(self) -> int:
+        import ctypes
+        obj = ctypes.py_object(self.mmap)
+        address = ctypes.c_void_p()
+        length = ctypes.c_ssize_t()
+        ctypes.pythonapi.PyObject_AsReadBuffer(obj, ctypes.byref(address), ctypes.byref(length))
+        return address.value
+
     def read(self, sz: int = 0) -> bytes:
         if sz <= 0:
             sz = self.size