/usr/share/pyshared/pywebdav/server/daemonize.py is in python-webdav 0.9.8-7.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 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 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | #Copyright (c) 2005 Simon Pamies (s.pamies@banality.de)
#Copyright (c) 2003 Clark Evans
#Copyright (c) 2002 Noah Spurrier
#Copyright (c) 2001 Juergen Hermann
#
#This library is free software; you can redistribute it and/or
#modify it under the terms of the GNU Library General Public
#License as published by the Free Software Foundation; either
#version 2 of the License, or (at your option) any later version.
#
#This library is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
#Library General Public License for more details.
#
#You should have received a copy of the GNU Library General Public
#License along with this library; if not, write to the Free
#Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
#MA 02111-1307, USA
'''
This module is used to fork the current process into a daemon.
Almost none of this is necessary (or advisable) if your daemon
is being started by inetd. In that case, stdin, stdout and stderr are
all set up for you to refer to the network connection, and the fork()s
and session manipulation should not be done (to avoid confusing inetd).
Only the chdir() and umask() steps remain as useful.
References:
UNIX Programming FAQ
1.7 How do I get my program to act like a daemon?
http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16
Advanced Programming in the Unix Environment
W. Richard Stevens, 1992, Addison-Wesley, ISBN 0-201-56317-7.
History:
2005/06/23 by Simon Pamies
2001/07/10 by Juergen Hermann
2002/08/28 by Noah Spurrier
2003/02/24 by Clark Evans
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/66012
'''
import sys, os, time
from signal import SIGTERM
def deamonize(stdout='/dev/null', stderr=None, stdin='/dev/null',
pidfile=None, startmsg = 'started with pid %s' ):
'''
This forks the current process into a daemon.
The stdin, stdout, and stderr arguments are file names that
will be opened and be used to replace the standard file descriptors
in sys.stdin, sys.stdout, and sys.stderr.
These arguments are optional and default to /dev/null.
Note that stderr is opened unbuffered, so
if it shares a file with stdout then interleaved output
may not appear in the order that you expect.
'''
# Do first fork.
try:
pid = os.fork()
if pid > 0: sys.exit(0) # Exit first parent.
except OSError, e:
sys.stderr.write("fork #1 failed: (%d) %s\n" % (e.errno, e.strerror))
sys.exit(1)
# Decouple from parent environment.
os.chdir("/")
os.umask(0)
os.setsid()
# Do second fork.
try:
pid = os.fork()
if pid > 0: sys.exit(0) # Exit second parent.
except OSError, e:
sys.stderr.write("fork #2 failed: (%d) %s\n" % (e.errno, e.strerror))
sys.exit(1)
# Open file descriptors and print start message
if not stderr: stderr = stdout
si = file(stdin, 'r')
so = file(stdout, 'a+')
se = file(stderr, 'a+', 0)
pid = str(os.getpid())
sys.stderr.write("\n%s\n" % startmsg % pid)
sys.stderr.flush()
if pidfile: file(pidfile,'w+').write("%s\n" % pid)
if sys.stdin.closed: sys.stdin = open('/dev/null', 'r')
if sys.stdout.closed: sys.stdout = open('/dev/null', 'a+')
if sys.stderr.closed: sys.stderr = open('/dev/null', 'a+')
# Redirect standard file descriptors.
os.dup2(si.fileno(), sys.stdin.fileno())
os.dup2(so.fileno(), sys.stdout.fileno())
os.dup2(se.fileno(), sys.stderr.fileno())
def startstop(stdout='/dev/null', stderr=None, stdin='/dev/null',
pidfile='pid.txt', startmsg = 'started with pid %s', action='start' ):
if action:
try:
pf = file(pidfile,'r')
pid = int(pf.read().strip())
pf.close()
except IOError:
pid = None
if 'stop' == action or 'restart' == action:
if not pid:
mess = "Could not stop, pid file '%s' missing.\n"
sys.stderr.write(mess % pidfile)
if 'stop' == action:
sys.exit(1)
action = 'start'
pid = None
else:
try:
while 1:
os.kill(pid,SIGTERM)
time.sleep(1)
except OSError, err:
err = str(err)
if err.find("No such process") > 0:
os.remove(pidfile)
if 'stop' == action:
sys.exit(0)
action = 'start'
pid = None
else:
print str(err)
sys.exit(1)
if 'start' == action:
if pid:
mess = "Start aborted since pid file '%s' exists.\n"
sys.stderr.write(mess % pidfile)
sys.exit(1)
deamonize(stdout,stderr,stdin,pidfile,startmsg)
return
if 'status' == action:
if not pid:
sys.stderr.write('Status: Stopped\n')
else: sys.stderr.write('Status: Running\n')
sys.exit(0)
|