fix #2116, macOS, net_connections() crashing

It turns out that proc_pidinfo() crashes for PID 0

Signed-off-by: Giampaolo Rodola <[email protected]>

HISTORY.rst

@@ -7,6 +7,7 @@ XXXX-XX-XX
 
 **Bug fixes**
 
+- 2116_, [macOS]: `psutil.net_connections`_ fails with RuntimeError.
 - 2135_, [macOS]: `Process.environ()`_ may contain garbage data. Fix
   out-of-bounds read around ``sysctl_procargs``.  (patch by Bernhard Urban-Forster)
 - 2138_, [Linux], **[critical]**: can't compile psutil on Android due to

psutil/_psutil_osx.c

@@ -955,6 +955,10 @@ psutil_proc_open_files(PyObject *self, PyObject *args) {
     if (! PyArg_ParseTuple(args, _Py_PARSE_PID, &pid))
         goto error;
 
+    // see: https://github.com/giampaolo/psutil/issues/2116
+    if (pid == 0)
+        return py_retlist;
+
     fds_pointer = psutil_proc_list_fds(pid, &num_fds);
     if (fds_pointer == NULL)
         goto error;
@@ -1047,6 +1051,10 @@ psutil_proc_connections(PyObject *self, PyObject *args) {
         goto error;
     }
 
+    // see: https://github.com/giampaolo/psutil/issues/2116
+    if (pid == 0)
+        return py_retlist;
+
     if (!PySequence_Check(py_af_filter) || !PySequence_Check(py_type_filter)) {
         PyErr_SetString(PyExc_TypeError, "arg 2 or 3 is not a sequence");
         goto error;