--- a/channel.h	Wed Feb 28 22:11:39 2018 +0800
+++ b/channel.h	Thu Oct 15 19:55:15 2020 +0800
@@ -69,10 +69,6 @@
 	int sent_close, recv_close;
 	int recv_eof, sent_eof;
 
-	/* Set after running the ChanType-specific close hander
-	 * to ensure we don't run it twice (nor type->checkclose()). */
-	int close_handler_done;
-
 	struct dropbear_progress_connection *conn_pending;
 	int initconn; /* used for TCP forwarding, whether the channel has been
 					 fully initialised */
@@ -95,10 +91,17 @@
 
 	int sepfds; /* Whether this channel has separate pipes for in/out or not */
 	const char *name;
+	/* Sets up the channel */
 	int (*inithandler)(struct Channel*);
+	/* Called to check whether a channel should close, separately from the FD being closed.
+	Used for noticing process exiting */
 	int (*check_close)(const struct Channel*);
+	/* Handler for ssh_msg_channel_request */
 	void (*reqhandler)(struct Channel*);
+	/* Called prior to sending ssh_msg_channel_close, used for sending exit status */
 	void (*closehandler)(const struct Channel*);
+	/* Frees resources, called just prior to channel being removed */
+	void (*cleanup)(const struct Channel*);
 };
 
 /* Callback for connect_remote */