pythongh-113536: Expose os.waitid on macOS (python#113542)

* pythongh-113536: Expose `os.waitid` on macOS

This API has been available on macOS for a long time, but was
explicitly excluded due to unspecified problems with the API
in ancient versions of macOS.

* Document that the API is available on macOS starting in Python 3.13

Doc/library/os.rst

@@ -4986,11 +4986,11 @@ written in Python, such as a mail server's external command delivery program.
 
    .. availability:: Unix, not Emscripten, not WASI.
 
-   .. note::
-      This function is not available on macOS.
-
    .. versionadded:: 3.3
 
+   .. versionchanged:: 3.13
+      This function is now available on macOS as well.
+
 
 .. function:: waitpid(pid, options, /)
 

Misc/NEWS.d/next/macOS/2023-12-28-12-18-39.gh-issue-113536.0ythg7.rst

@@ -0,0 +1 @@
+:func:`os.waitid` is now available on macOS

Modules/posixmodule.c

@@ -1024,7 +1024,7 @@ typedef struct {
     PyObject *TerminalSizeType;
     PyObject *TimesResultType;
     PyObject *UnameResultType;
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
     PyObject *WaitidResultType;
 #endif
 #if defined(HAVE_WAIT3) || defined(HAVE_WAIT4)
@@ -2292,7 +2292,7 @@ static PyStructSequence_Desc statvfs_result_desc = {
     10
 };
 
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
 PyDoc_STRVAR(waitid_result__doc__,
 "waitid_result: Result from waitid.\n\n\
 This object may be accessed either as a tuple of\n\
@@ -2367,7 +2367,7 @@ _posix_clear(PyObject *module)
     Py_CLEAR(state->TerminalSizeType);
     Py_CLEAR(state->TimesResultType);
     Py_CLEAR(state->UnameResultType);
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
     Py_CLEAR(state->WaitidResultType);
 #endif
 #if defined(HAVE_WAIT3) || defined(HAVE_WAIT4)
@@ -2392,7 +2392,7 @@ _posix_traverse(PyObject *module, visitproc visit, void *arg)
     Py_VISIT(state->TerminalSizeType);
     Py_VISIT(state->TimesResultType);
     Py_VISIT(state->UnameResultType);
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
     Py_VISIT(state->WaitidResultType);
 #endif
 #if defined(HAVE_WAIT3) || defined(HAVE_WAIT4)
@@ -9518,7 +9518,7 @@ os_wait4_impl(PyObject *module, pid_t pid, int options)
 #endif /* HAVE_WAIT4 */
 
 
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
 /*[clinic input]
 os.waitid
 
@@ -9575,7 +9575,7 @@ os_waitid_impl(PyObject *module, idtype_t idtype, id_t id, int options)
 
     return result;
 }
-#endif /* defined(HAVE_WAITID) && !defined(__APPLE__) */
+#endif /* defined(HAVE_WAITID) */
 
 
 #if defined(HAVE_WAITPID)
@@ -17309,7 +17309,7 @@ posixmodule_exec(PyObject *m)
         return -1;
     }
 
-#if defined(HAVE_WAITID) && !defined(__APPLE__)
+#if defined(HAVE_WAITID)
     waitid_result_desc.name = MODNAME ".waitid_result";
     state->WaitidResultType = (PyObject *)PyStructSequence_NewType(&waitid_result_desc);
     if (PyModule_AddObjectRef(m, "waitid_result", state->WaitidResultType) < 0) {