tevent: add tevent_req_cancel() infrastructure

This offers a generic way for callers to cancel an
async request.

metze

1 files changed, 19 insertions, 0 deletions

diff --git a/lib/tevent/tevent_internal.h b/lib/tevent/tevent_internal.h
index e260524208..513ca1c732 100644
--- a/lib/tevent/tevent_internal.h
+++ b/lib/tevent/tevent_internal.h
@@ -65,6 +65,15 @@ struct tevent_req {
 	tevent_req_print_fn private_print;
 
 	/**
+	 * @brief A function to cancel the request
+	 *
+	 * The implementation might want to set a function
+	 * that is called when the tevent_req_cancel() function
+	 * was called.
+	 */
+	tevent_req_cancel_fn private_cancel;
+
+	/**
 	 * @brief Internal state of the request
 	 *
 	 * Callers should only access this via functions and never directly.
@@ -100,6 +109,16 @@ struct tevent_req {
 		const char *finish_location;
 
 		/**
+		 * @brief The location where the request was canceled
+		 *
+		 * This uses the __location__ macro via the
+		 * tevent_req_cancel() macro.
+		 *
+		 * This for debugging only.
+		 */
+		const char *cancel_location;
+
+		/**
 		 * @brief The external state - will be queried by the caller
 		 *
 		 * While the async request is being processed, state will remain in