create a daemon process, run program in the background.

daemonize.py

#! /usr/bin/env python
import os
import sys 


if __name__ == "__main__": 

    if len(sys.argv) < 2: 
        print("usage: daemon.py cmdline")
        exit() 

    logname = "-".join(sys.argv[1:]).replace("/", "-")
    print "ok: /tmp/%s.stdin, stdout, stdout" % logname

    progname = sys.argv[1] 
    os.close(0)
    os.close(1)
    os.close(2)   

    stdin = open("/tmp/%s.stdin" % logname, "w+") 
    stdout = open("/tmp/%s.stdout" % logname, "w+") 
    stderr = open("/tmp/%s.stderr" % logname, "w+") 

    status = None
    try:
        status =  os.fork()
    except OSError as e:
        print(e)
    if status == 0:
        os.setsid()
        status2 = None
        try:
            status2 = os.fork()
        except OSError as e:
            print(e)
        if status2 != 0:
            exit() 
    else:
        exit() 

    status3 = None
    try:
        status3 = os.fork() 
    except OSError as e:
        print(e)

    if status3 == 0:
        try: 
            os.execvp(sys.argv[1], sys.argv[1:]) 
        except OSError as e:
            print(e)