fix #1009: sensors_temperatures() may raise OSError.

HISTORY.rst

@@ -13,6 +13,7 @@
 - 1004_: [Linux] Process.io_counters() may raise ValueError.
 - 1006_: [Linux] cpu_freq() may return None on some Linux versions does not
   support the function; now the function is not declared instead.
+- 1009_: [Linux] sensors_temperatures() may raise OSError.
 
 *2017-03-24*
 

psutil/_pslinux.py

@@ -1112,10 +1112,18 @@ def sensors_temperatures():
     for base in basenames:
         unit_name = cat(os.path.join(os.path.dirname(base), 'name'),
                         binary=False)
-        label = cat(base + '_label', fallback='', binary=False)
-        current = float(cat(base + '_input')) / 1000.0
         high = cat(base + '_max', fallback=None)
         critical = cat(base + '_crit', fallback=None)
+        label = cat(base + '_label', fallback='', binary=False)
+        try:
+            current = float(cat(base + '_input')) / 1000.0
+        except OSError as err:
+            # https://github.com/giampaolo/psutil/issues/1009
+            if err.errno == errno.EIO:
+                warnings.warn("ignoring %r" % err, RuntimeWarning)
+                continue
+            else:
+                raise
 
         if high is not None:
             high = float(high) / 1000.0

psutil/tests/test_linux.py

@@ -1200,6 +1200,25 @@ def open_mock(name, *args, **kwargs):
             assert m.called
 
 
+@unittest.skipUnless(LINUX, "LINUX only")
+class TestSensorsTemperatures(unittest.TestCase):
+
+    def test_emulate_eio_error(self):
+        def open_mock(name, *args, **kwargs):
+            if name.endswith("_input"):
+                raise OSError(errno.EIO, "")
+            else:
+                return orig_open(name, *args, **kwargs)
+
+        orig_open = open
+        patch_point = 'builtins.open' if PY3 else '__builtin__.open'
+        with mock.patch(patch_point, side_effect=open_mock) as m:
+            with warnings.catch_warnings(record=True) as ws:
+                self.assertEqual(psutil.sensors_temperatures(), {})
+                assert m.called
+                self.assertIn("ignoring", str(ws[0].message))
+
+
 # =====================================================================
 # --- test process
 # =====================================================================