[ale] How to catch an error?

[ups at tree.com (Stephan Uphoff)]

Take a look at wait() and waitpid()
(man 2 wait)

> 
> I want to use execvp to execute a command, i.e. ping.  How do I catch the
> error return of "ping"?
> 
> My mind seems to go blank today.
> 
> Appreciate any comments/suggestions.
> Bao
> 
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