implement process cwd

psutil/_psutil_openbsd.c

@@ -688,14 +688,33 @@ psutil_proc_num_fds(PyObject *self, PyObject *args) {
     return Py_BuildValue("i", cnt);
 }
 
+
 /*
- * No way to get cwd on OpenBSD
+ * Process current working directory.
+ * Reference:
+ * http://anoncvs.spacehopper.org/openbsd-src/tree/bin/ps/print.c#n179
  */
 static PyObject *
 psutil_proc_cwd(PyObject *self, PyObject *args) {
-    return Py_BuildValue("s", "");
+    long pid;
+    struct kinfo_proc kp;
+    char path[MAXPATHLEN];
+    size_t pathlen = sizeof path;
+
+    if (! PyArg_ParseTuple(args, "l", &pid))
+        return NULL;
+    if (psutil_kinfo_proc(pid, &kp) == -1)
+        return NULL;
+
+    int name[] = { CTL_KERN, KERN_PROC_CWD, pid };
+    if (sysctl(name, 3, path, &pathlen, NULL, 0) != 0) {
+        PyErr_SetFromErrno(PyExc_OSError);
+        return NULL;
+    }
+    return Py_BuildValue("s", path);
 }
 
+
 #if 0
 // The tcplist fetching and walking is borrowed from netstat/inet.c.
 static char *