Re: Creating a daemon process in Python
Eirikur Hallgrimsson [EMAIL PROTECTED] wrote: def daemonize(): if (not os.fork()): # get our own session and fixup std[in,out,err] os.setsid() sys.stdin.close() sys.stdout = NullDevice() sys.stderr = NullDevice() That doesn't close the underlying file descriptors... Here is another method which does :- null = os.open(os.devnull, os.O_RDWR) os.dup2(null, sys.stdin.fileno()) os.dup2(null, sys.stdout.fileno()) os.dup2(null, sys.stderr.fileno()) os.close(null) if (not os.fork()): # hang around till adopted by init ppid = os.getppid() while (ppid != 1): time.sleep(0.5) ppid = os.getppid() Why do you need hang around until adopted by init? I've never see that in a daemonize recipe before? else: # time for child to die os._exit(0) else: # wait for child to die and then bail os.wait() sys.exit() -- Nick Craig-Wood [EMAIL PROTECTED] -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a daemon process in Python
On Fri, 23 Feb 2007 08:30:07 -0600, Nick Craig-Wood [EMAIL PROTECTED] wrote: Eirikur Hallgrimsson [EMAIL PROTECTED] wrote: [snip] if (not os.fork()): # hang around till adopted by init ppid = os.getppid() while (ppid != 1): time.sleep(0.5) ppid = os.getppid() Why do you need hang around until adopted by init? I've never see that in a daemonize recipe before? I think it simplifies some signal handling logic. I'd never seen it before in a deamonizer either, but it caught my eye in this one. I haven't had time to investigate further though. I hope Eirikur will explain. :) Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a daemon process in Python
I didn't actually write this module. I believe I found it in a discussion in ASPN at Active State. Thanks for the input, and when I get a chance I will try these alternate approaches. This module has been working fine for me as is--so far. Eirikur -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a daemon process in Python
Thanks all, I understood there is no shortcut function like BSD daemon(). I'll do it manually using examples from cookbook... On 2月22日, 午前1:41, Benjamin Niemann [EMAIL PROTECTED] wrote: Hello, Sakagami Hiroki wrote: What is the easiest way to create a daemon process in Python? Google says I should call fork() and other system calls manually, but is there no os.daemon() and the like? You could try http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/278731 HTH -- Benjamin Niemann Email: pink at odahoda dot de WWW:http://pink.odahoda.de/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a daemon process in Python
On 2007-02-22, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: I understood there is no shortcut function like BSD daemon(). I'll do it manually using examples from cookbook... Sure would be nice if somebody posted one. ;) -- Grant Edwards grante Yow! Oh, I get it!! The at BEACH goes on, huh, visi.comSONNY?? -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a daemon process in Python
Benjamin Niemann wrote: What is the easiest way to create a daemon process in Python? Google says I should call fork() and other system calls manually, but is there no os.daemon() and the like? You could try http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/278731 Also, more discussion on the topic here: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/66012 j -- Joshua Kugler Lead System Admin -- Senior Programmer http://www.eeinternet.com PGP Key: http://pgp.mit.edu/ ID 0xDB26D7CE -- Posted via a free Usenet account from http://www.teranews.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a daemon process in Python
Hello, Sakagami Hiroki wrote: What is the easiest way to create a daemon process in Python? Google says I should call fork() and other system calls manually, but is there no os.daemon() and the like? You could try http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/278731 HTH -- Benjamin Niemann Email: pink at odahoda dot de WWW: http://pink.odahoda.de/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a daemon process in Python
Sakagami Hiroki wrote: Hi, What is the easiest way to create a daemon process in Python? I find that this works great. I just pasted my copy, I think you can find it via Google. Eirikur # Daemon Module - basic facilities for becoming a daemon process # By Coy Krill # Combines ideas from Steinar Knutsens daemonize.py and # Jeff Kunces demonize.py Facilities for Creating Python Daemons import os import time import sys class NullDevice: def write(self, s): pass def daemonize(): if (not os.fork()): # get our own session and fixup std[in,out,err] os.setsid() sys.stdin.close() sys.stdout = NullDevice() sys.stderr = NullDevice() if (not os.fork()): # hang around till adopted by init ppid = os.getppid() while (ppid != 1): time.sleep(0.5) ppid = os.getppid() else: # time for child to die os._exit(0) else: # wait for child to die and then bail os.wait() sys.exit() -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a daemon process in Python
On Feb 21, 9:33 am, Eirikur Hallgrimsson [EMAIL PROTECTED] wrote: Sakagami Hiroki wrote: What is the easiest way to create a daemon process in Python? I've found it even easier to use the built in threading modules: import time t1 = time.time() print t_poc.py called at, t1 import threading def im_a_thread(): time.sleep(10) print This is your thread speaking at, time.time() thread = threading.Thread(target=im_a_thread) thread.setDaemon(True) thread.start() t2 = time.time() print Time elapsed in main thread:, t2 - t1 Of course, your mileage may vary. -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a daemon process in Python
[EMAIL PROTECTED] wrote: On Feb 21, 9:33 am, Eirikur Hallgrimsson [EMAIL PROTECTED] wrote: Sakagami Hiroki wrote: What is the easiest way to create a daemon process in Python? I've found it even easier to use the built in threading modules: import time t1 = time.time() print t_poc.py called at, t1 import threading def im_a_thread(): time.sleep(10) print This is your thread speaking at, time.time() thread = threading.Thread(target=im_a_thread) thread.setDaemon(True) thread.start() t2 = time.time() print Time elapsed in main thread:, t2 - t1 Of course, your mileage may vary. That's not a daemon process (which are used to execute 'background services' in UNIX environments). -- Benjamin Niemann Email: pink at odahoda dot de WWW: http://pink.odahoda.de/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Creating a daemon process in Python
On Feb 21, 3:34 pm, Benjamin Niemann [EMAIL PROTECTED] wrote: That's not a daemon process (which are used to execute 'background services' in UNIX environments). I had not tested this by running the script directly, and in writing a response, I found out that the entire interpreter closed when the main thread exited (killing the daemonic thread in the process). This is different behavior from running the script interactively, and thus my confusion. Thanks! ~Garrick -- http://mail.python.org/mailman/listinfo/python-list
