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'''Bcfg2 daemon support'''
__revision__ = '$Revision$'
import os
import sys
def daemonize(filename):
'''Do the double fork/setsession dance'''
# Check if the pid is active
try:
pidfile = open(filename, "r")
oldpid = int(pidfile.readline())
# getpgid() will retun an IO error if all fails
os.getpgid(oldpid)
pidfile.close()
# If we got this far without exceptions, there is another instance
# running. Exit gracefully.
print("PID File (%s) exists and listed PID (%d) is active." % \
(filename, oldpid))
raise SystemExit(1)
except OSError:
pidfile.close()
except (IOError, ValueError):
# pid file doesn't
pass
# Fork once
if os.fork() != 0:
os._exit(0)
os.setsid() # Create new session
pid = os.fork()
if pid != 0:
try:
pidfile = open(filename, "w")
pidfile.write("%i" % pid)
pidfile.close()
except:
print("Failed to write pid file %s" % filename)
os._exit(0)
os.chdir("/")
os.umask(0)
null = open("/dev/null", "w+")
os.dup2(null.fileno(), sys.__stdin__.fileno())
os.dup2(null.fileno(), sys.__stdout__.fileno())
os.dup2(null.fileno(), sys.__stderr__.fileno())
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