Issue #17931: Resolve confusion on Windows between pids and process handles.

Include/longobject.h

@@ -52,6 +52,19 @@ PyAPI_FUNC(PyObject *) PyLong_GetInfo(void);
 #error "sizeof(pid_t) is neither sizeof(int), sizeof(long) or sizeof(long long)"
 #endif /* SIZEOF_PID_T */
 
+#if SIZEOF_VOID_P == SIZEOF_INT
+#  define _Py_PARSE_INTPTR "i"
+#  define _Py_PARSE_UINTPTR "I"
+#elif SIZEOF_VOID_P == SIZEOF_LONG
+#  define _Py_PARSE_INTPTR "l"
+#  define _Py_PARSE_UINTPTR "k"
+#elif defined(SIZEOF_LONG_LONG) && SIZEOF_VOID_P == SIZEOF_LONG_LONG
+#  define _Py_PARSE_INTPTR "L"
+#  define _Py_PARSE_UINTPTR "K"
+#else
+#  error "void* different in size from int, long and long long"
+#endif /* SIZEOF_VOID_P */
+
 /* Used by Python/mystrtoul.c. */
 #ifndef Py_LIMITED_API
 PyAPI_DATA(unsigned char) _PyLong_DigitValue[256];

Misc/NEWS

@@ -10,9 +10,8 @@ What's New in Python 3.4.0 Alpha 1?
 Core and Builtins
 -----------------
 
-- Issue #17931: Fix PyLong_FromPid() on Windows 64-bit: processes are
-  identified by their HANDLE which is a pointer (and not a long, which is
-  smaller).
+- Issue #17931: Resolve confusion on Windows between pids and process
+  handles.
 
 - Tweak the exception message when the magic number or size value in a bytecode
   file is truncated.

Modules/posixmodule.c

@@ -5014,11 +5014,7 @@ posix_spawnv(PyObject *self, PyObject *args)
     if (spawnval == -1)
         return posix_error();
     else
-#if SIZEOF_LONG == SIZEOF_VOID_P
-        return Py_BuildValue("l", (long) spawnval);
-#else
-        return Py_BuildValue("L", (PY_LONG_LONG) spawnval);
-#endif
+        return Py_BuildValue(_Py_PARSE_INTPTR, spawnval);
 }
 
 
@@ -5104,11 +5100,7 @@ posix_spawnve(PyObject *self, PyObject *args)
     if (spawnval == -1)
         (void) posix_error();
     else
-#if SIZEOF_LONG == SIZEOF_VOID_P
-        res = Py_BuildValue("l", (long) spawnval);
-#else
-        res = Py_BuildValue("L", (PY_LONG_LONG) spawnval);
-#endif
+        res = Py_BuildValue(_Py_PARSE_INTPTR, spawnval);
 
     while (--envc >= 0)
         PyMem_DEL(envlist[envc]);
@@ -6178,16 +6170,17 @@ static PyObject *
 win32_kill(PyObject *self, PyObject *args)
 {
     PyObject *result;
-    DWORD pid, sig, err;
+    pid_t pid;
+    DWORD sig, err;
     HANDLE handle;
 
-    if (!PyArg_ParseTuple(args, "kk:kill", &pid, &sig))
+    if (!PyArg_ParseTuple(args, _Py_PARSE_PID "k:kill", &pid, &sig))
         return NULL;
 
     /* Console processes which share a common console can be sent CTRL+C or
        CTRL+BREAK events, provided they handle said events. */
     if (sig == CTRL_C_EVENT || sig == CTRL_BREAK_EVENT) {
-        if (GenerateConsoleCtrlEvent(sig, pid) == 0) {
+        if (GenerateConsoleCtrlEvent(sig, (DWORD)pid) == 0) {
             err = GetLastError();
             PyErr_SetFromWindowsErr(err);
         }
@@ -6197,7 +6190,7 @@ win32_kill(PyObject *self, PyObject *args)
 
     /* If the signal is outside of what GenerateConsoleCtrlEvent can use,
        attempt to open and terminate the process. */
-    handle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid);
+    handle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, (DWORD)pid);
     if (handle == NULL) {
         err = GetLastError();
         return PyErr_SetFromWindowsErr(err);
@@ -6603,7 +6596,7 @@ posix_waitpid(PyObject *self, PyObject *args)
     Py_intptr_t pid;
     int status, options;
 
-    if (!PyArg_ParseTuple(args, _Py_PARSE_PID "i:waitpid", &pid, &options))
+    if (!PyArg_ParseTuple(args, _Py_PARSE_INTPTR "i:waitpid", &pid, &options))
         return NULL;
     Py_BEGIN_ALLOW_THREADS
     pid = _cwait(&status, pid, options);
@@ -6612,7 +6605,7 @@ posix_waitpid(PyObject *self, PyObject *args)
         return posix_error();
 
     /* shift the status left a byte so this is more like the POSIX waitpid */
-    return Py_BuildValue("Ni", PyLong_FromPid(pid), status << 8);
+    return Py_BuildValue(_Py_PARSE_INTPTR "i", pid, status << 8);
 }
 #endif /* HAVE_WAITPID || HAVE_CWAIT */
 

PC/msvcrtmodule.c

@@ -113,11 +113,12 @@ os.O_BINARY.");
 static PyObject *
 msvcrt_open_osfhandle(PyObject *self, PyObject *args)
 {
-    long handle;
+    Py_intptr_t handle;
     int flags;
     int fd;
 
-    if (!PyArg_ParseTuple(args, "li:open_osfhandle", &handle, &flags))
+    if (!PyArg_ParseTuple(args, _Py_PARSE_INTPTR "i:open_osfhandle",
+                          &handle, &flags))
         return NULL;
 
     fd = _open_osfhandle(handle, flags);

PC/pyconfig.h

@@ -723,8 +723,8 @@ Py_NO_ENABLE_SHARED to find out.  Also support MS_NO_COREDLL for b/w compat */
 /* The size of `wchar_t', as computed by sizeof. */
 #define SIZEOF_WCHAR_T 2
 
-/* The size of `pid_t' (HANDLE). */
-#define SIZEOF_PID_T SIZEOF_VOID_P
+/* The size of `pid_t', as computed by sizeof. */
+#define SIZEOF_PID_T SIZEOF_INT
 
 /* Define if you have the dl library (-ldl).  */
 /* #undef HAVE_LIBDL */