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Subject: Re: MAX_PID changes in 2.5.31
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andries Brouwer <aebr@win.tue.nl>
Cc: Ingo Molnar <mingo@elte.hu>, Richard Gooch <rgooch@ras.ucalgary.ca>,
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On Thu, 2002-08-22 at 23:11, Andries Brouwer wrote:
> Ha, Alan - I am a bit slow, and you are a bit brief, but let us see.
> 
> I interpreted your "throughout" as "also outside IPC", and hence asked
> for clarification. For the moment, let me assume that we are just talking
> about SYSV IPC. (You were not thinking about uids instead of pids?)

I don't think there are any other pid ones. I've no idea what libc4 used
but I don't think I actually care . 

On the kernel side I found a ushort pid in coda, but I can't actually
easily tell if thats a process id or a coda thingy. We have some other
sloppy pid users but they all appear to be int (eg vt_kern.h)


> Remains the question whether that is bad.
> With large pid_t, the four variables msg_lspid, msg_lrpid, shm_cpid,
> shm_lpid will be truncated.
> 
> Who uses these? Nobody, as far as I can see from a recent collection
> of RPMs.

I have to admit I've not looked. I know of one (older AberMUD) which did
it for security tricks but thats hardly relevant to this nor a reason to
worry.

Alan

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