diff options
| -rw-r--r-- | doc/mach.texi | 9 | ||||
| -rw-r--r-- | include/mach/message.h | 5 |
2 files changed, 13 insertions, 1 deletions
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; |