Re: [PATCH 3/8] include: add msgh_protected_payload to mach_msg_header_t

[Samuel Thibault]

Ack.

Justus Winter, le Thu 18 Sep 2014 15:22:45 +0200, a écrit :
> * include/mach/message.h (mach_msg_header_t): Add
>   msgh_protected_payload as a union with msgh_local_port.
> * doc/mach.texi (Message Format): Document msgh_protected_payload.
> ---
>  doc/mach.texi          | 9 +++++++++
>  include/mach/message.h | 5 ++++-
>  2 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/doc/mach.texi b/doc/mach.texi
> index 3175df1..671e0d0 100644
> --- a/doc/mach.texi
> +++ b/doc/mach.texi
> @@ -1330,6 +1330,15 @@ which is conventionally used as a reply port by the 
> recipient of the
>  message.  The field must carry a send right, a send-once right,
>  @code{MACH_PORT_NULL}, or @code{MACH_PORT_DEAD}.
>  
> +@item unsigned long msgh_protected_payload
> +The @code{msgh_protected_payload} field carries a payload that is set
> +by the kernel during message delivery.  The payload is an opaque
> +identifier that can be used by the receiver to lookup the associated
> +data structure.
> +
> +It is only valid in received messages.  See @ref{Message Receive} for
> +further information.
> +
>  @item mach_port_seqno_t msgh_seqno
>  The @code{msgh_seqno} field provides a sequence number for the message.
>  It is only valid in received messages; its value in sent messages is
> diff --git a/include/mach/message.h b/include/mach/message.h
> index f78e978..7464a57 100644
> --- a/include/mach/message.h
> +++ b/include/mach/message.h
> @@ -136,7 +136,10 @@ typedef  struct {
>      mach_msg_bits_t  msgh_bits;
>      mach_msg_size_t  msgh_size;
>      mach_port_t              msgh_remote_port;
> -    mach_port_t              msgh_local_port;
> +    union {
> +        mach_port_t  msgh_local_port;
> +        unsigned long        msgh_protected_payload;
> +    };
>      mach_port_seqno_t        msgh_seqno;
>      mach_msg_id_t    msgh_id;
>  } mach_msg_header_t;
> -- 
> 2.1.0
> 

-- 
Samuel
c> [ ] morning [ ] afternoon [ ] evening [ ] night , everyone (choose as 
applicable)