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utils.py

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import os

import sys

from mitmproxy.utils import data as mdata

import typing # noqa

class MemBool:

"""

Truth-checking with a memory, for use in chained if statements.

"""

def __init__(self) -> None:

self.v: typing.Optional[bool] = None

def __call__(self, v: bool) -> bool:

self.v = v

return bool(v)

# FIXME: change this name

data = mdata.Data(__name__)

def daemonize(stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'): # pragma: no cover

try:

pid = os.fork()

if pid > 0:

sys.exit(0)

except OSError as e:

sys.stderr.write("fork #1 failed: (%d) %s\n" % (e.errno, e.strerror))

sys.exit(1)

os.chdir("/")

os.umask(0)

os.setsid()

try:

pid = os.fork()

if pid > 0:

sys.exit(0)

except OSError as e:

sys.stderr.write("fork #2 failed: (%d) %s\n" % (e.errno, e.strerror))

sys.exit(1)

si = open(stdin, 'rb')

so = open(stdout, 'a+b')

se = open(stderr, 'a+b', 0)

os.dup2(si.fileno(), sys.stdin.fileno())

os.dup2(so.fileno(), sys.stdout.fileno())

os.dup2(se.fileno(), sys.stderr.fileno())