Mercurial > genshi > mirror
comparison examples/trac/trac/util/daemon.py @ 39:93b4dcbafd7b trunk
Copy Trac to main branch.
| author | cmlenz |
|---|---|
| date | Mon, 03 Jul 2006 18:53:27 +0000 |
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| children |
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| 38:ee669cb9cccc | 39:93b4dcbafd7b |
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| 1 # -*- coding: utf-8 -*- | |
| 2 # | |
| 3 # Copyright (C) 2006 Edgewall Software | |
| 4 # All rights reserved. | |
| 5 # | |
| 6 # This software is licensed as described in the file COPYING, which | |
| 7 # you should have received as part of this distribution. The terms | |
| 8 # are also available at http://trac.edgewall.com/license.html. | |
| 9 # | |
| 10 # This software consists of voluntary contributions made by many | |
| 11 # individuals. For the exact contribution history, see the revision | |
| 12 # history and logs, available at http://projects.edgewall.com/trac/. | |
| 13 | |
| 14 import os | |
| 15 import sys | |
| 16 | |
| 17 def daemonize(stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'): | |
| 18 """Fork a daemon process (taken from the Python Cookbook).""" | |
| 19 | |
| 20 # Perform first fork | |
| 21 pid = os.fork() | |
| 22 if pid > 0: | |
| 23 sys.exit(0) # exit first parent | |
| 24 | |
| 25 # Decouple from parent environment | |
| 26 os.chdir('/') | |
| 27 os.umask(0) | |
| 28 os.setsid() | |
| 29 | |
| 30 # Perform second fork | |
| 31 pid = os.fork() | |
| 32 if pid > 0: | |
| 33 sys.exit(0) # exit first parent | |
| 34 | |
| 35 # The process is now daemonized, redirect standard file descriptors | |
| 36 for fileobj in sys.stdout, sys.stderr: | |
| 37 fileobj.flush() | |
| 38 stdin = file(stdin, 'r') | |
| 39 stdout = file(stdout, 'a+') | |
| 40 stderr = file(stderr, 'a+', 0) | |
| 41 os.dup2(stdin.fileno(), sys.stdin.fileno()) | |
| 42 os.dup2(stdout.fileno(), sys.stdout.fileno()) | |
| 43 os.dup2(stderr.fileno(), sys.stderr.fileno()) |