fork zlo

  • Anonymous
  • Python
  • 27 May 2008 
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#!/usr/local/bin/python



import os, sys

import signal

import inspect

import threading

import timeit

import stat

from time import sleep

import time



LOGFILE='log.txt'

CHILDPID='mychildspids'

thrn = 0

class Log:

    def __init__(self, f):

        self.f = f

    def write(self, s):

        self.f.write(s)

        self.f.flush()





def sig_handler(*args, **kwargs):

    if len(args) > 0 and inspect.isfunction(args[0]):

        usr_handler = args[0]

        args = args[1:]

        def res_handler(sing_num, frame):

            usr_handler(*args, **kwargs)

        return res_handler

    else:

        def tmp_handler(handler_func):

            return sig_handler(handler_func, *args, **kwargs)

        return tmp_handler

 

def child_pidfile(pidfile):

    @sig_handler(pidfile)

    def child_delete_pidfile(pidfile):

        print "child sigterm arrived"

        d = open(pidfile, 'r')

        lines = d.readlines()

        lines = map(str,lines)

        lines = map(str.rstrip,lines)

        

        

        mypid = str(os.getpid())

        if mypid in lines:

            print "ya ya im child"

            del lines[lines.index(mypid)]

            d.write("\n".join(lines))

            

        else:

            print "hm.. huy"

        d.close

        

        

        if len(lines) == 0:

            os.unlink(pidfile)

            

        os._exit(0)

        

    try:

        mode = os.stat(pidfile)

    except OSError, e:

        fm = 'w'    

    else:

        if mode[stat.ST_SIZE] > 0:

            fm='a'

    

    open(pidfile, fm).write(str(os.getpid())+"\n")

    signal.signal(signal.SIGTERM, child_delete_pidfile)



def create_masterpid(pidfile):

    @sig_handler(pidfile)

    def master_delete_pidfile(pidfile):

        print "master sigterm arrived"

        d = open(pidfile, 'r')

        lines = d.readlines()

        lines = map(str.rstrip,lines)

        lines = map(int,lines)

        d.close

        for line in lines:

            print "master is killing %s" % line

            os.kill(line, signal.SIGTERM)

        

        os.unlink(pidfile)

        sys.exit(0)

 

    open(pidfile, 'w').write(str(os.getpid()))

    signal.signal(signal.SIGTERM, master_delete_pidfile)

    

    

 

def main(params):

    while 1:

        sleep(0.5)

 

if __name__ == '__main__':

    



    if os.fork() != 0:

        os._exit(0)	

        

        

    os.setsid()

    

    if os.fork() != 0:

         os._exit(0)

    #else:

    #sys.exit(1)

        

    

    sys.stdout = sys.stderr = Log(open(LOGFILE, 'a+'))

 

    

    for i in range(1,5):

        print "trying to create %i daemon" % i

        pid = os.fork()

        if pid > 0:

            print "deamon %i online!" % pid

            child_pidfile(CHILDPID)

            main(i)

            os._exit(0)

    

    master = os.getpid()

    print "heey, im master! %i" % master

    create_masterpid("master.pid")

    

 

    while 1:

        sleep(0.5)

    sys.exit(0)
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