Issue #18673: Add O_TMPFILE to os module. O_TMPFILE requires Linux kernel

3.11 or newer. It's only defined on system with 3.11 uapi headers, too.

Doc/library/os.rst

@@ -919,6 +919,7 @@ or `the MSDN <http://msdn.microsoft.com/en-us/library/z0kc8e3z.aspx>`_ on Window
           O_NOFOLLOW
           O_NOATIME
           O_PATH
+          O_TMPFILE
 
    These constants are GNU extensions and not present if they are not defined by
    the C library.

Misc/NEWS

@@ -28,6 +28,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #18673: Add O_TMPFILE to os module. O_TMPFILE requires Linux kernel
+  3.11 or newer. It's only defined on system with 3.11 uapi headers, too.
+
 - Issue #18532: Change the builtin hash algorithms' names to lower case names
   as promised by hashlib's documentation.
 

Modules/posixmodule.c

@@ -11245,6 +11245,9 @@ all_ins(PyObject *m)
 #ifdef O_TTY_INIT
     if (PyModule_AddIntMacro(m, O_TTY_INIT)) return -1;
 #endif
+#ifdef O_TMPFILE
+    if (PyModule_AddIntMacro(m, O_TMPFILE)) return -1;
+#endif
 #ifdef PRIO_PROCESS
     if (PyModule_AddIntMacro(m, PRIO_PROCESS)) return -1;
 #endif