decorator and signal handler

stalex shao.tu at gmail.com
Wed Sep 5 11:39:42 CEST 2007


Hi all,

I wrote the following code since I want to try using a decorator to
install signal handler:

## The test.py script
#################
import os
import time
import signal

def sigHandler(sid):
    def handler(f):
        signal.signal(sid, f)
        return f
    return handler

class Test(object):
    @sigHandler(signal.SIGTERM)
    def _sigHandler(self, signalId, currentFrame):
        print "Received:", signalId

if __name__ == "__main__":
    print "pid:", os.getpid()

    t = Test()
    time.sleep(300)

# From terminal, say A
####################
$ python test.py
pid: 1234

# From terminal, say B
###################
$ kill -TERM 1234

After issuing the kill command from terminal B, the process of test.py
from terminal A is terminated.
Python print out some exception message as following:
Traceback (most recent call last):
    File "a.py", line 22, in <module>
        time.sleep(300)
TypeError: _sigHandler() takes exactly 3 arguments (2 given)

At a guess, I think the decorator I defined did not pass the 'self' as
the first argument to _sigHandler() method, did it? And I have no idea
of how to write a correct one. Any suggestion?




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