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#!/usr/bin/env python

# This code has been written by Sander Marechal and published at:
# http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/
# where the author has placed it in the public domain (see comment #6 at
# http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/#c6
# ).
# Some minor modifications have been made by the V8 authors. The work remains
# in the public domain.

import atexit
import os
from signal import SIGTERM
from signal import SIGINT
import sys
import time


class Daemon(object):
"""
A generic daemon class.

Usage: subclass the Daemon class and override the run() method
"""
def __init__(self, pidfile, stdin='/dev/null',
stdout='/dev/null', stderr='/dev/null'):
self.stdin = stdin
self.stdout = stdout
self.stderr = stderr
self.pidfile = pidfile

def daemonize(self):
"""
do the UNIX double-fork magic, see Stevens' "Advanced
Programming in the UNIX Environment" for details (ISBN 0201563177)
http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16
"""
try:
pid = os.fork()
if pid > 0:
# exit first parent
sys.exit(0)
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.setsid()
os.umask(0)

# do second fork
try:
pid = os.fork()
if pid > 0:
# exit from second parent
sys.exit(0)
except OSError, e:
sys.stderr.write("fork #2 failed: %d (%s)\n" % (e.errno, e.strerror))
sys.exit(1)

# redirect standard file descriptors
sys.stdout.flush()
sys.stderr.flush()
si = file(self.stdin, 'r')
so = file(self.stdout, 'a+')
se = file(self.stderr, 'a+', 0)
# TODO: (debug) re-enable this!
#os.dup2(si.fileno(), sys.stdin.fileno())
#os.dup2(so.fileno(), sys.stdout.fileno())
#os.dup2(se.fileno(), sys.stderr.fileno())

# write pidfile
atexit.register(self.delpid)
pid = str(os.getpid())
file(self.pidfile, 'w+').write("%s\n" % pid)

def delpid(self):
os.remove(self.pidfile)

def start(self):
"""
Start the daemon
"""
# Check for a pidfile to see if the daemon already runs
try:
pf = file(self.pidfile, 'r')
pid = int(pf.read().strip())
pf.close()
except IOError:
pid = None

if pid:
message = "pidfile %s already exist. Daemon already running?\n"
sys.stderr.write(message % self.pidfile)
sys.exit(1)

# Start the daemon
self.daemonize()
self.run()

def stop(self):
"""
Stop the daemon
"""
# Get the pid from the pidfile
try:
pf = file(self.pidfile, 'r')
pid = int(pf.read().strip())
pf.close()
except IOError:
pid = None

if not pid:
message = "pidfile %s does not exist. Daemon not running?\n"
sys.stderr.write(message % self.pidfile)
return # not an error in a restart

# Try killing the daemon process
try:
# Give the process a one-second chance to exit gracefully.
os.kill(pid, SIGINT)
time.sleep(1)
while 1:
os.kill(pid, SIGTERM)
time.sleep(0.1)
except OSError, err:
err = str(err)
if err.find("No such process") > 0:
if os.path.exists(self.pidfile):
os.remove(self.pidfile)
else:
print str(err)
sys.exit(1)

def restart(self):
"""
Restart the daemon
"""
self.stop()
self.start()

def run(self):
"""
You should override this method when you subclass Daemon. It will be
called after the process has been daemonized by start() or restart().
"""

Change log

r12643 by jkumme...@chromium.org on Oct 1, 2012   Diff
Version 3.14.1

Don't set -m32 flag when compiling with
Android ARM compiler. (Chromium issue
143889)

Restore the descriptor array before
returning allocation failure. (Chromium
issue 151750)

Lowered kMaxVirtualRegisters (v8 issue
2139, Chromium issues 123822 and 128252).
...
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