kernel: msg: include details about who sent a message

libmango/include/mango/types.h

@@ -61,9 +61,19 @@ typedef struct {
 } kern_msg_handle_t;
 
 typedef struct {
+	/* transaction id. identifies a particular request/response exchange.
+	 * used when replying to a particular message. */
 	msgid_t msg_id;
+	/* the id of the task that sent a particular message. */
+	tid_t msg_sender;
+	/* the id of the port or channel used to send a particular message. */
+	koid_t msg_endpoint;
+	/* a list of iovecs that point to the buffers that make up the main
+	 * message data. */
 	kern_iovec_t *msg_data;
 	size_t msg_data_count;
+	/* a list of handle entries that contain the kernel handles included
+	 * in a message. */
 	kern_msg_handle_t *msg_handles;
 	size_t msg_handles_count;
 } kern_msg_t;