fix #1738 / osx / exe(): catch ENOENT which may occur if process is still alive but the executable file which launched it got deleted

2 files changed, 15 insertions, 3 deletions

diff --git a/HISTORY.rst b/HISTORY.rst
index af5dab68..3be3915f 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -15,6 +15,8 @@ XXXX-XX-XX
 
 **Bug fixes**
 
+- 1738_: [macOS] Process.exe() may raise FileNotFoundError if process is still
+  alive but the exe file which launched it got deleted.
 - 1791_: [macOS] fix missing include for getpagesize().
 - 1823_: [Windows] Process.open_files() may cause a segfault due to a NULL
   pointer.
diff --git a/psutil/_psutil_osx.c b/psutil/_psutil_osx.c
index fdf34d97..ee8d1c83 100644
--- a/psutil/_psutil_osx.c
+++ b/psutil/_psutil_osx.c
@@ -298,11 +298,21 @@ psutil_proc_exe(PyObject *self, PyObject *args) {
     errno = 0;
     ret = proc_pidpath(pid, &buf, sizeof(buf));
     if (ret == 0) {
-        if (pid == 0)
+        if (pid == 0) {
             AccessDenied("automatically set for PID 0");
-        else
+            return NULL;
+        }
+        else if (errno == ENOENT) {
+            // It may happen (file not found error) if the process is
+            // still alive but the executable which launched it got
+            // deleted, see:
+            // https://github.com/giampaolo/psutil/issues/1738
+            return Py_BuildValue("s", "");
+        }
+        else {
             psutil_raise_for_pid(pid, "proc_pidpath()");
-        return NULL;
+            return NULL;
+        }
     }
     return PyUnicode_DecodeFSDefault(buf);
 }