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Date:      Wed, 16 Oct 2002 09:29:47 -0700
From:      Terry Lambert <tlambert2@mindspring.com>
To:        Maxim Sobolev <sobomax@FreeBSD.ORG>
Cc:        Robert Watson <rwatson@FreeBSD.ORG>, "Danny J. Zerkel" <dzerkel@columbus.rr.com>, "Vladimir B. Grebenschikov,Moscow,408-7227,123-4567,Some-info" <vova@express.ru>, freebsd-arch@FreeBSD.ORG, freebsd-current@FreeBSD.ORG
Subject:   Re: short uid/gid
Message-ID:  <3DAD93FB.78324E0E@mindspring.com>
References:  <Pine.NEB.3.96L.1021016004135.36711H-100000@fledge.watson.org> <3DAD2B79.AD5412CA@mindspring.com> <20021016093048.GB10908@vega.vega.com>

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Maxim Sobolev wrote:
> > You could also simply use non-intersecting cmd parameter values
> > for the new calls, which avaids the special flag, and leaves the
> > backward compatability without adding grundles of new system calls.
> 
> What about source-level compatibility, which IMO is a good thing,
> at least if it doesn't add too much complexity (it clearly doesn't
> in this case)? Also, handling single flag should be easier from
> the coding perspective than a load of new values, after all
> we can do something like:
> 
> #define IPC_STAT_OLD    0xXY
> #define IPC_SET_OLD     0xZW
> [...]
> 
> #define IPC_64          0x100
> 
> #define IPC_STAT        (IPC_STAT_OLD | IPC_64)
> #define IPC_SET         (IPC_SET_OLD | IPC_64)
> [...]
> 
> Which automagically will bring 64-version of syscalls after
> recompilation, while retaining ABI compatibility.

This is exactly what I was suggesting.  In Linux, you do this manually
(read their header files).

-- Terry

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