How to tell if a process is active?

[John Cowan]

In article <4608 at ncrcae.Columbia.NCR.COM> wescott at ncrcae.Columbia.NCR.COM (Mike Wescott) writes:
>In article <2727 at infocenter.UUCP> mhoffman at infocenter.UUCP (Mike Hoffman) writes:
>> 
>> I have an application in which I need to check to see if a process
>> is currently active. 
>
>Try:
>
>isactive(pid)
>	if(kill(pid,0)==0 || errno == EPERM)
>		return(process is active)
>	else 
>		return(process is not active)
>
>see kill(2).
>
>-- 
>	-Mike Wescott
>	 mike.wescott at ncrcae.Columbia.NCR.COM


That doesn't work on all flavors of Unix.  Xenix supports it, so does
SVR2, but definitely not in V7.  I don't know about BSD.

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