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[ILUG] Maximum value of a PID

[ILUG] Maximum value of a PID

John P. Looney jplooney-ilug at online.ie
Sun Mar 12 18:01:05 GMT 2000


On Sun, Mar 12, 2000 at 04:23:55PM +0000, Niall mentioned:
> What is it ? pid_t is an int, which is 4 bytes (at least on 386, which concerns me, and
> I presume it's no shorter elsewhere) but I don't ever recall noticing a PID
> longer than 5 digits, and that's how much space there is for is for PID in
> top's output, so I'm guessing it wraps after 64K. As pid_t is 4 bytes, why
> is the wrapping done at 2 bytes (if I'm correct, and I think I am)

 I think it wraps at 32k actually. I vaugely remember running a script on
Solaris to run "echo > /dev/null" loads of times to prove a point to
someone, ages ago.

Kate

-- 
"The fool must be beaten with a stick, for an intelligent person 
the merest hint is sufficient"                -- Zen Master Greg




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