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# Example: daemonize pyinotify's notifier.
#
# Requires Python >= 2.5
import functools
import sys
import pyinotify
class Counter(object):
"""
Simple counter.
"""
def __init__(self):
self.count = 0
def plusone(self):
self.count += 1
def on_loop(notifier, counter):
"""
Dummy function called after each event loop, this method only
ensures the child process eventually exits (after 5 iterations).
"""
if counter.count > 4:
# Loops 5 times then exits.
sys.stdout.write("Exit\n")
notifier.stop()
sys.exit(0)
else:
sys.stdout.write("Loop %d\n" % counter.count)
counter.plusone()
wm = pyinotify.WatchManager()
notifier = pyinotify.Notifier(wm)
wm.add_watch('/tmp', pyinotify.ALL_EVENTS)
on_loop_func = functools.partial(on_loop, counter=Counter())
# Notifier instance spawns a new process when daemonize is set to True. This
# child process' PID is written to /tmp/pyinotify.pid (it also automatically
# deletes it when it exits normally). If no custom pid_file is provided it
# would write it more traditionally under /var/run/. Note that in both cases
# the caller must ensure the pid file doesn't exist when this method is called
# othewise it will raise an exception. /tmp/stdout.txt is used as stdout
# stream thus traces of events will be written in it. callback is the above
# function and will be called after each event loop.
try:
notifier.loop(daemonize=True, callback=on_loop_func,
pid_file='/tmp/pyinotify.pid', stdout='/tmp/stdout.txt')
except pyinotify.NotifierError, err:
print >> sys.stderr, err
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