Agent: add process checks

tools/pamusb-agent

@@ -20,6 +20,7 @@ import sys
 import pwd
 import getopt
 import signal
+import fcntl
 import re
 import subprocess
 import syslog
@@ -33,6 +34,23 @@ from gi.repository import UDisks
 
 import xml.etree.ElementTree as et
 
+def processCheck():
+
+	global filelock
+	filelock=open(os.path.realpath(__file__),'r')
+
+	try:
+		fcntl.flock(filelock,fcntl.LOCK_EX|fcntl.LOCK_NB)
+	except:
+		print('Process is already running.')
+		sys.exit(1)
+
+	if os.getuid() != 0:
+		print('Process must be run as root.')
+		sys.exit(1)
+
+processCheck()
+
 class HotPlugDevice:
 	def __init__(self, serial):
 		self.__udi = None