From owner-cvs-all  Tue Jun  9 05:32:18 1998
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Date: Tue, 9 Jun 1998 13:37:41 +0200
From: Eivind Eklund <eivind@yes.no>
To: Bruce Evans <bde@zeta.org.au>, cvs-committers@FreeBSD.ORG, phk@FreeBSD.ORG
Subject: Re: cvs commit: src/sys/sys time.h
References: <199806080115.LAA01973@godzilla.zeta.org.au>
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In-Reply-To: <199806080115.LAA01973@godzilla.zeta.org.au>; from Bruce Evans on Mon, Jun 08, 1998 at 11:15:24AM +1000
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On Mon, Jun 08, 1998 at 11:15:24AM +1000, Bruce Evans wrote:
> >  Modified files:
> >    sys/sys              time.h 
> >  Log:
> >  Sigh, all good words are reserved words these days...
> >  s/private/priv/
> 
> Why not use the standard method of adding a short prefix for struct
> members?  Almost all words are reserved for use by applications.

What's safe to use as struct members is anything starting with '_' - a
program isn't allowed to declare a macro or external identifier
starting with '_'.

To avoid this infecting the kernel, it is possible to do something
like this:

#ifdef KERNEL
#define _KERNVAR(a) a
#else
#define _KERNVAR(a) _kernelname_##a
#endif

struct whatever {
	int _KERNVAR(cost);
};

which creates nice identifiers in-kernel, and avoids polluting the
user namespace.

Of course, the above gives nasty-looking headerfiles - there is always
a tradeoff...

Eivind.


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