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Date: Fri, 6 Feb 2004 20:22:08 +1100
From: Tim Robbins <tjr@freebsd.org>
To: Julian Elischer <julian@elischer.org>
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cc: FreeBSD current users <current@freebsd.org>
Subject: Re: FreeBSD 1.1 under -current :-)
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On Fri, Feb 06, 2004 at 12:37:30AM -0800, Julian Elischer wrote:
[...]
> apparrently programs in 1.1 can not handle that the PID can go past
> 32767 now.. 'wait()' for example fails..
> 
> ok , so recompile my kenrel with PID_MAX set to 30000
> and try again..
> all works fine..
> 
> I'm tempted to make PID_MAX a tunable or a sysctl..

I think FreeBSD 1.1 compatibility is obscure enough that there's no
need for it to work in out of the box (i.e. GENERIC) at the cost of
increased complexity in non-obscure configurations. Ideally, COMPAT_43
would be broken up into COMPAT_43, COMPAT_FREEBSD[123], etc., removed
from GENERIC and perhaps then we could define PID_MAX conditionally
on these options or at least #error out.

> I think that some compatibility modes may have teh same problems
> (though I doubt that many people use anything other than Linux
> compatibility)

As far as I know, only iBCS2 needs 16-bit bits. iBCS2 support would
be more productive dead, as would our obviously unused and untested
SVR4 support.


Tim