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   <title>Freesoft Linux FAQ -- 如何写一个Deamon程序</title>
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如何写一个deamon程序？
<br>&nbsp;
<br>发信站: BBS 水木清华站 (Fri Nov 27 01:22:52 1998)
<br>【 在 gjx (小侃帝) 的大作中提到: 】
<br>:&nbsp; as titile who can tell me !
<br>:&nbsp; thansks
<br>&nbsp;
<br>1> ignore the signals, SIGINT, SIGQUIT, SIGTRAP, SIGIOT, SIGTERM, etc
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; signal(xxx,SIGIGN);
<br>2> close all the file descriptors
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for (i=32,i>=3,i--)
<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
close(i);
<br>3> fork (maybe twice)
<br>4> chdir("/")
<br>5> umask(0)
<br>6> call setpgrp() to become the head of the new process group
<br>&nbsp;
<br>Some steps can be omitted.
<br>You can make it. Good luck!
<br>&nbsp;
<br>--
<br>注：另外在《Linux从入门到精通》书中也有讲解。
<br>&nbsp;
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