Linux的守护进程（Python）

Linux的守护进程（Python）

 

Python实现参考代码：

 

#! /usr/bin/env python

 

import os, sys

 

def daemon_create():

    # do the UNIX double-fork magic, see Stevens' "Advanced   

    # Programming in the UNIX Environment" for details (ISBN 0201563177)  

    try:   

        pid = os.fork()   

        if pid > 0:  

            # exit first parent  

            sys.exit(0)   

    except OSError, e:   

        writelog("fork #1 failed: %d (%s)" % (e.errno, e.strerror))

        sys.exit(1)  

    # decouple from parent environment  

    os.chdir("/")   

    os.setsid()   

    os.umask(0)   

    # do second fork  

    try:   

        pid = os.fork()   

        if pid > 0:  

            # exit from second parent, print eventual PID before 

            writelog("Daemon PID %d" % pid )

            sys.exit(0)   

    except OSError, e:  

        writelog("fork #2 failed: %d (%s)" % (e.errno, e.strerror))

        sys.exit(1)