[cs631apue] Questions about clean zombie children processes

[Hongyi Shen]

Hello everyone:

After some searching, there seems to be two ways to kill exited child
processes.
#1. use *signal()* catch SIGCHLD with *waitpid() .  *(or fork 2 times)
#2. terminate them by shell commands.

here is my question:
Which way does real world server do with this problem?
If it is #1, when to *signal() *the zombies* *?
(I assume that should be each time new process forked, it check whether
SIGCHLD exist and then handle them)
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