daemon.py 文件源码

def _start(self, foreground = True):
        if self.username is None:
            if os.getuid() == 0:
                sys.stderr.write("Refusing to run as superuser\n")
                sys.exit(1)
            self.pw = pwd.getpwuid(os.getuid())
        else:
            self.pw = pwd.getpwnam(self.username)
            if os.getuid() not in (0, self.pw.pw_uid):
                sys.stderr.write("Cannot run as user \"%s\"\n" % (self.username, ))
                sys.exit(1)

        setproctitle(self.procname)

        if not foreground:
            self._drop_priv()
            self.pre_daemonize()
            self._daemonize()
            if self.pidfile:
                self._write_pid()
            self._open_log(syslog = self.syslog)
        else:
            self._drop_priv()
            self.pre_daemonize()
            self._open_log(syslog = False, debug = True)

        self.run()