From 6f4a6228998df48ee09413377785d13d2eec7998 Mon Sep 17 00:00:00 2001
From: Giampaolo Rodola <g.rodola@gmail.com>
Date: Fri, 25 Jan 2019 16:36:17 +0100
Subject: [PATCH] #1394 / windows / process exe(): convert errno 0 into
 ERROR_ACCESS_DENIED; errno 0 occurs when the Python process runs in 'Virtual
 Secure Mode'

---
 HISTORY.rst              | 10 ++++++++++
 psutil/_psutil_linux.c   |  5 ++++-
 psutil/_psutil_windows.c |  6 +++++-
 psutil/_pswindows.py     |  4 +++-
 4 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/HISTORY.rst b/HISTORY.rst
index 44afa960f..095c90623 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -1,5 +1,15 @@
 *Bug tracker at https://github.com/giampaolo/psutil/issues*
 
+5.5.1
+=====
+
+XXXX-XX-XX
+
+**Bug fixes**
+
+- 1394_: [Windows] Process.exe() returns "[Error 0] The operation completed
+  successfully" when Python process runs in "Virtual Secure Mode".
+
 5.5.0
 =====
 
diff --git a/psutil/_psutil_linux.c b/psutil/_psutil_linux.c
index bd27b5f9c..5b7a56ad9 100644
--- a/psutil/_psutil_linux.c
+++ b/psutil/_psutil_linux.c
@@ -211,6 +211,7 @@ psutil_disk_partitions(PyObject *self, PyObject *args) {
     file = setmntent(mtab_path, "r");
     Py_END_ALLOW_THREADS
     if ((file == 0) || (file == NULL)) {
+        psutil_debug("setmntent() failed");
         PyErr_SetFromErrnoWithFilename(PyExc_OSError, mtab_path);
         goto error;
     }
@@ -298,8 +299,10 @@ psutil_proc_cpu_affinity_get(PyObject *self, PyObject *args) {
     while (1) {
         setsize = CPU_ALLOC_SIZE(ncpus);
         mask = CPU_ALLOC(ncpus);
-        if (mask == NULL)
+        if (mask == NULL) {
+            psutil_debug("CPU_ALLOC() failed");
             return PyErr_NoMemory();
+        }
         if (sched_getaffinity(pid, setsize, mask) == 0)
             break;
         CPU_FREE(mask);
diff --git a/psutil/_psutil_windows.c b/psutil/_psutil_windows.c
index ce44258a3..4251e0c71 100644
--- a/psutil/_psutil_windows.c
+++ b/psutil/_psutil_windows.c
@@ -765,7 +765,11 @@ psutil_proc_exe(PyObject *self, PyObject *args) {
     if (NULL == hProcess)
         return NULL;
     if (GetProcessImageFileNameW(hProcess, exe, MAX_PATH) == 0) {
-        PyErr_SetFromWindowsErr(0);
+        // https://github.com/giampaolo/psutil/issues/1394
+        if (GetLastError() == 0)
+            PyErr_SetFromWindowsErr(ERROR_ACCESS_DENIED);
+        else
+            PyErr_SetFromWindowsErr(0);
         CloseHandle(hProcess);
         return NULL;
     }
diff --git a/psutil/_pswindows.py b/psutil/_pswindows.py
index bb5882422..664d5b6b1 100644
--- a/psutil/_pswindows.py
+++ b/psutil/_pswindows.py
@@ -698,7 +698,9 @@ def exe(self):
         # see https://github.com/giampaolo/psutil/issues/528
         if self.pid in (0, 4):
             raise AccessDenied(self.pid, self._name)
-        return py2_strencode(convert_dos_path(cext.proc_exe(self.pid)))
+        exe = cext.proc_exe(self.pid)
+        exe = convert_dos_path(exe)
+        return py2_strencode(exe)
 
     @wrap_exceptions
     def cmdline(self):