Clean up tracking info

telescope.py

 import socket
 import logging
 import time
+import atexit
 from datetime import datetime
 from astropy.coordinates import SkyCoord, RangeError
 from configparser import ConfigParser
@@ -22,6 +23,13 @@ _AZIMUTH_GEAR = 15006.75 # from dt_ctrl.ctrl
 _ELEVATION_GEAR = 44803.125
 
 
+def clearTrackingInfo():
+    try:
+        os.remove("/tmp/telescope_trackinginfo")
+    except OSError:
+        pass
+
+
 class Telescope:
     def __init__(self, setmode=None, consoleHost=None, waitForFirstUpdate=False):
         """
@@ -628,6 +636,7 @@ class Telescope:
             f.write(str(pid) + '\n')
             f.write(script_name + '\n')
             f.write(script_arguments)
+        atexit.register(clearTrackingInfo)
 
     def getTrackingInfo(self):
         """
@@ -647,7 +656,7 @@ class Telescope:
         if psutil.pid_exists(int(pid)):
             return script_name.strip(), script_arguments.strip()
         else:
-            os.remove("/tmp/telescope_trackinginfo")
+            clearTrackingInfo()
             return None