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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center"> ● UNIX网络编程 (BM: clown) </font></big></big></td></tr>
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void setup_daemon(void) <br>
{ <br>
int i; <br>
for (i = 0; i<NOFILE; ++i) <br>
close(i); <br>
switch (fork()) <br>
{ <br>
case -1: <br>
{ <br>
perror("setup_daemon(), 1st fork()"); <br>
exit(2); <br>
} <br>
default: <br>
exit(0); //parent <br>
case 0: //child <br>
if (setsid()==-1) <br>
{ perror("setup_daemon(), setsid()"); <br>
exit(3); <br>
} <br>
//第二次fork确保即使以后daemon process打开某终端时，也不会自动获取该终端 <br>
//为控制终端。当session leader打开某终端时，该终端会自动成为该session leader <br>
//的控制终端。还必须处理session leader退出时发出的SIGHUP信号。 <br>
//signal(SIGHUP,SIG_IGN); <br>
switch (fork()) <br>
{ <br>
case -1: <br>
{ <br>
perror("setup_daemon(), 2nd fork()"); <br>
exit(3); <br>
} <br>
<br>
default: <br>
exit(0); <br>
case 0: <br>
chroot("\") <br>
umask(0); <br>
/* and return with daemon set up */ <br>
return; <br>
} <br>
} <br>
} <br>
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