Detach

Fork and detach the current process.

Usage

The detach package contains a context manager called Detach. It is used with with statement to fork the current process and execute code in that process. The child process exits when the context manager exits. The following parameters may be passed to Detach to change its behavior:

stdout - Redirect child stdout to this stream.
stderr - Redirect child stderr to this stream.
stdin - Redirect his stream to child stdin.
close_fds - Close all file descriptors in the child excluding stdio.
exclude_fds - Do not close these file descriptors if close_fds is True.
daemonize - Exit the parent process when the context manager exits.

Examples

Simple Fork with STDOUT

import detach, os, sys

with detach.Detach(sys.stdout) as d:
    if d.pid:
        print("forked child with pid {}".format(d.pid))
    else:
        print("hello from child process {}".format(os.getpid()))

Daemonize

import detach
from your_app import main

def main():
    """Your daemon code here."""

with detach.Detach(daemonize=True) as d:
    if d.pid:
        print("started process {} in background".format(pid))
    else:
        main()

Call External Command

import detach, sys
pid = detach.call(['bash', '-c', 'echo "my pid is $$"'], stdout=sys.stdout)
print("running external command {}".format(pid))