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.

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