On Linux, use this to manage objects that can cause a SIGIO to be generated. It calls all registered objects.
Python, 33 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | # this handler manages a chain of registered callback functions.
class SIGIOHandler:
def __init__(self):
self.handlers = []
self.on()
def on(self):
signal.signal(signal.SIGIO, self)
def off(self):
signal.signal(signal.SIGIO, signal.SIG_DFL)
def register(self, callback):
self.handlers.append(callback)
return len(self.handlers) - 1 # the handle
def unregister(self, handle=0):
if self.handlers:
del self.handlers[handle]
def __call__(self, sig, frame):
for h in self.handlers:
h(frame)
# a singleton instance of the SIGIOHandler. Usually, users of this module only
# have to register a DirectoryNotifier object here. Other objects (Dispatcher
# objects) are registered with the poller (which is already set up to be called
# when SIGIO occurs). But you may add your own hooks to it.
try:
manager
except NameError:
manager = SIGIOHandler()
|
Use this to register callable objects that need to handle SIGIO events. This allows asyncronous operation of various file, socket, and directory events.
Only works with Linux.
Tags: sysadmin
