[3.11] GH-93899: fix checks for eventfd flags (GH-95170). (#95342)

(cherry picked from commit 4dd099b)

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>

Author: kumaraditya303

Misc/NEWS.d/next/Library/2022-07-23-10-50-05.gh-issue-93899.VT34A5.rst

@@ -0,0 +1 @@
+Fix check for existence of :data:`os.EFD_CLOEXEC`, :data:`os.EFD_NONBLOCK` and :data:`os.EFD_SEMAPHORE` flags on older kernel versions where these flags are not present. Patch by Kumar Aditya.

Modules/clinic/posixmodule.c.h

@@ -13134,7 +13134,7 @@ os_memfd_create_impl(PyObject *module, PyObject *name, unsigned int flags)
 }
 #endif
 
-#ifdef HAVE_EVENTFD
+#if defined(HAVE_EVENTFD) && defined(EFD_CLOEXEC)
 /*[clinic input]
 os.eventfd
 
@@ -13205,7 +13205,7 @@ os_eventfd_write_impl(PyObject *module, int fd, unsigned long long value)
     }
     Py_RETURN_NONE;
 }
-#endif  /* HAVE_EVENTFD */
+#endif  /* HAVE_EVENTFD && EFD_CLOEXEC */
 
 /* Terminal size querying */
 
@@ -15505,11 +15505,15 @@ all_ins(PyObject *m)
 #endif
 #endif /* HAVE_MEMFD_CREATE */
 
-#ifdef HAVE_EVENTFD
+#if defined(HAVE_EVENTFD) && defined(EFD_CLOEXEC)
     if (PyModule_AddIntMacro(m, EFD_CLOEXEC)) return -1;
+#ifdef EFD_NONBLOCK
     if (PyModule_AddIntMacro(m, EFD_NONBLOCK)) return -1;
+#endif
+#ifdef EFD_SEMAPHORE
     if (PyModule_AddIntMacro(m, EFD_SEMAPHORE)) return -1;
 #endif
+#endif  /* HAVE_EVENTFD && EFD_CLOEXEC */
 
 #if defined(__APPLE__)
     if (PyModule_AddIntConstant(m, "_COPYFILE_DATA", COPYFILE_DATA)) return -1;