Support Python versions and platforms with no time.monotonic() function

Python 2 and Python 3 earlier than 3.3 do not have this function.

Use the PyPI monotonic backport module if needed and available.

Fall back on non-monotonic time if neither is available.

2 files changed, 23 insertions, 0 deletions

diff --git a/iotop/data.py b/iotop/data.py
index a7b3278..115bb8f 100644
--- a/iotop/data.py
+++ b/iotop/data.py
@@ -28,6 +28,17 @@ import struct
 import sys
 import time
 
+# Try to ensure time.monotonic() is available
+# This normally requires Python 3.3 or later.
+# Use PyPI monotonic if needed and available.
+# Fall back on non-monotonic time if needed.
+try:
+    if not hasattr(time, 'monotonic'):
+        from monotonic import monotonic
+        time.monotonic = monotonic
+except (ImportError, RuntimeError):
+    time.monotonic = time.time
+
 #
 # Check for requirements:
 #   o Linux >= 2.6.20 with I/O accounting and VM event counters
diff --git a/iotop/ui.py b/iotop/ui.py
index d414559..c22ed1a 100644
--- a/iotop/ui.py
+++ b/iotop/ui.py
@@ -29,6 +29,18 @@ import select
 import signal
 import sys
 import time
+
+# Try to ensure time.monotonic() is available.
+# This normally requires Python 3.3 or later.
+# Use PyPI monotonic if needed and available.
+# Fall back on non-monotonic time if needed.
+try:
+    if not hasattr(time, 'monotonic'):
+        from monotonic import monotonic
+        time.monotonic = monotonic
+except (ImportError, RuntimeError):
+    time.monotonic = time.time
+
 from collections import OrderedDict
 
 from iotop.data import find_uids, TaskStatsNetlink, ProcessList, Stats