def signalHandler(self, signum, frame):
"""Meta signal handler that dispatches to registered handlers."""
signame = Daemon.get_signal_name(signum)
zLOG.LOG('Z2', zLOG.INFO , "Caught signal %s" % signame)
for handler in self.registry.get(signum, []):
# Never let a bad handler prevent the standard signal
# handlers from running.
try: handler()
except SystemExit:
# if we trap SystemExit, we can't restart
raise
except:
zLOG.LOG('Z2', zLOG.WARNING,
'A handler for %s failed!' % signame,
error=sys.exc_info())
def registerHandler(self, signum, handler):
"""Register a handler function that will be called when the process
recieves the signal signum. The signum argument must be a signal
constant such as SIGTERM. The handler argument must be a function
or method that takes no arguments. Note that handlers will not
be called on non-posix platforms."""
if os.name != 'posix':
return
items = self.registry.get(signum)
if items is None:
items = self.registry[signum] = []
signal.signal(signum, self.signalHandler)
signame = Daemon.get_signal_name(signum)
zLOG.LOG('Z2', zLOG.BLATHER, "Installed sighandler for %s" % (
signame
))
items.insert(0, handler)
