svn commit: r194538 - head/sys/sys

[Kostik Belousov]

On Tue, Jun 23, 2009 at 06:12:48PM -0400, David Schultz wrote:
> On Sat, Jun 20, 2009, Kostik Belousov wrote:
> > On Sat, Jun 20, 2009 at 04:39:25PM +0000, Ed Schouten wrote:
> > > Author: ed
> > > Date: Sat Jun 20 16:39:25 2009
> > > New Revision: 194538
> > > URL: http://svn.freebsd.org/changeset/base/194538
> > > 
> > > Log:
> > >   Add placeholder to prevent reuse of privilege 254.
> > >   
> > >   Requested by:	rwatson
> > > 
> > > Modified:
> > >   head/sys/sys/priv.h
> > > 
> > > Modified: head/sys/sys/priv.h
> > > ==============================================================================
> > > --- head/sys/sys/priv.h	Sat Jun 20 16:37:24 2009	(r194537)
> > > +++ head/sys/sys/priv.h	Sat Jun 20 16:39:25 2009	(r194538)
> > > @@ -211,6 +211,7 @@
> > >  #define	PRIV_TTY_DRAINWAIT	251	/* Set tty drain wait time. */
> > >  #define	PRIV_TTY_DTRWAIT	252	/* Set DTR wait on tty. */
> > >  #define	PRIV_TTY_EXCLUSIVE	253	/* Override tty exclusive flag. */
> > > +#define	_PRIV_TTY_PRISON	254	/* Removed. */
> > >  #define	PRIV_TTY_STI		255	/* Simulate input on another tty. */
> > >  #define	PRIV_TTY_SETA		256	/* Set tty termios structure. */
> > >  
> > Names starting with two underscores or underscore and upper-case letter
> > are reserved to the C language implementation. We should not use it
> > in the code.
> 
> Applications are not supposed to use such symbols, but we use them
> pervasively in system headers specifically to avoid conflicting
> with symbols an application might define.  (Effectively, we
> consider system headers to be part of the language implementation.)

My interpretation is that we use freestanding environment for the kernel,
and appropriate requirements shall be fullfilled by kernel code.
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