发个在linux下用python写守护进程的好东东（转）
一个别人写的模块，可以直接用来把一个普通进程改为守护进程。
并且自动把标准输出重定向到日志文件，很实用啊。
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<BR>
'''''<BR>
This module is used to fork the current process into a daemon.<BR>
Almost none of this is necessary (or advisable) if your daemon <BR>
is being started by inetd. In that case, stdin, stdout and stderr are <BR>
all set up for you to refer to the network connection, and the fork()s <BR>
and session manipulation should not be done (to avoid confusing inetd). <BR>
Only the chdir() and umask() steps remain as useful.<BR>
References:<BR>
UNIX Programming FAQ<BR>
1.7 How do I get my program to act like a daemon?<BR>
[url]http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16[/url]<BR>
Advanced Programming in the Unix Environment<BR>
W. Richard Stevens, 1992, Addison-Wesley, ISBN 0-2
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