What is __BSD_VISIBLE for?

[Steven Smith]

> __BSD_VISIBLE is throughout the system header files that are located at
> sys/sys, specifically I am looking at the msg.h file and the struct mymsg;
> however, I have noticed this in quite a few other places and I was hoping
> that someone out there would know what its use is?
There are a few features which are traditional for BSD systems, but
whcih are incompatible with e.g. POSIX.  These tend to be hidden
behind #ifdef __BSD_VISIBLE, so that programs only see them if they
want them.

__BSD_VISIBLE is #define's automatically by sys/cdefs.h, but you can
disable that with a special option to gcc (-traditional, I think).

Steven.

> 
> Keith
> 
> -----Original Message-----
> From: owner-freebsd-newbies at freebsd.org
> [mailto:owner-freebsd-newbies at freebsd.org] On Behalf Of Nikolas Britton
> Sent: Tuesday, January 18, 2005 12:45 PM
> To: Keith Bottner
> Cc: 'Freebsd-Newbies at Freebsd. Org'
> Subject: Re: What is __BSD_VISIBLE for?
> 
> Keith Bottner wrote:
> 
> >I have noticed that __BSD_VISIBLE is used through out the sys headers. 
> >What is this used to distinguish between? Anyone? Where is it set? Or 
> >where should it be set?
> > 
> >Keith
> >
> >  
> >
> hu?
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