WAITing for specific process

[Arthur David Olson]

> > . . .What if you want to wait for a particular child?
> 
>   . . .#define	DELAY	2		/* test interval, in seconds */
> 
> 		while ( kill( pid, 0 ) == 0 )
> 			sleep( (unsigned)DELAY );
> 		}

Please note that this technique is not portable to 4.1bsd systems, where
attempts to use signal zero always cause kill to return a non-zero value.
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