/usr/share/pyshared/loggerhead/daemon.py is in loggerhead 1.19~bzr461-1.
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 | # daemon code from ASPN
#
import os
def daemonize(pidfile, home):
"""
Detach this process from the controlling terminal and run it in the
background as a daemon.
"""
WORKDIR = "/"
REDIRECT_TO = getattr(os, 'devnull', '/dev/null')
MAXFD = 1024
try:
pid = os.fork()
except OSError, e:
raise Exception("%s [%d]" % (e.strerror, e.errno))
if pid == 0: # The first child.
os.setsid()
try:
pid = os.fork() # Fork a second child.
except OSError, e:
raise Exception("%s [%d]" % (e.strerror, e.errno))
if pid == 0: # The second child.
os.chdir(WORKDIR)
else:
os._exit(0) # Exit parent (the first child) of the second child.
else:
os._exit(0) # Exit parent of the first child.
import resource # Resource usage information.
maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
if (maxfd == resource.RLIM_INFINITY):
maxfd = MAXFD
fd = os.open(REDIRECT_TO, os.O_RDONLY)
os.dup2(fd, 0)
fd = os.open(REDIRECT_TO, os.O_WRONLY)
os.dup2(fd, 1)
os.dup2(fd, 2)
# Iterate through and close all other file descriptors.
for fd in range(3, maxfd):
try:
os.close(fd)
except OSError: # ERROR, fd wasn't open to begin with (ignored)
pass
f = open(pidfile, 'w')
f.write('%d\n' % (os.getpid(),))
f.close()
def is_running(pidfile):
try:
f = open(pidfile, 'r')
except IOError:
return False
pid = int(f.readline())
f.close()
try:
os.kill(pid, 0)
except OSError:
# no such process
return False
return True
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