Make struct tevent_req opaque

Move struct tevent_req in tevent_internal, and ad getters and setters
for private data and the callback function.
This patch also renames 'private_state' into 'data'. What is held in this
pointer is in fact data and not a state like enum tevent_req_state.
Calling it 'state' is confusing.

The functions addedd are:
tevent_req_set_callback() - sets req->async.fn and req->async.private_data
tevent_req_set_print_fn() - sets req->private_print
tevent_req_callback_data() - gets req->async.private_data
tevent_req_data() - gets rea->data

This way it is much simpler to keep API/ABI compatibility in the future.

2 files changed, 23 insertions, 30 deletions

diff --git a/source3/lib/util_sock.c b/source3/lib/util_sock.c
index 6e75a67a85..3604be369f 100644
--- a/source3/lib/util_sock.c
+++ b/source3/lib/util_sock.c
@@ -1033,8 +1033,7 @@ struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 		    timeval_current_ofs(0, state->wait_nsec))) {
 		goto fail;
 	}
-	subreq->async.fn = open_socket_out_connected;
-	subreq->async.private_data = result;
+	tevent_req_set_callback(subreq, open_socket_out_connected, result);
 	return result;
 
  post_status:
@@ -1047,10 +1046,10 @@ struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
 
 static void open_socket_out_connected(struct tevent_req *subreq)
 {
-	struct tevent_req *req = talloc_get_type_abort(
-		subreq->async.private_data, struct tevent_req);
-	struct open_socket_out_state *state = talloc_get_type_abort(
-		req->private_state, struct open_socket_out_state);
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq, struct tevent_req);
+	struct open_socket_out_state *state =
+		tevent_req_data(req, struct open_socket_out_state);
 	int ret;
 	int sys_errno;
 
@@ -1089,8 +1088,7 @@ static void open_socket_out_connected(struct tevent_req *subreq)
 			tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 			return;
 		}
-		subreq->async.fn = open_socket_out_connected;
-		subreq->async.private_data = req;
+		tevent_req_set_callback(subreq, open_socket_out_connected, req);
 		return;
 	}
 
@@ -1107,8 +1105,8 @@ static void open_socket_out_connected(struct tevent_req *subreq)
 
 NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
 {
-	struct open_socket_out_state *state = talloc_get_type_abort(
-		req->private_state, struct open_socket_out_state);
+	struct open_socket_out_state *state =
+		tevent_req_data(req, struct open_socket_out_state);
 	NTSTATUS status;
 
 	if (tevent_req_is_nterror(req, &status)) {
@@ -1217,14 +1215,13 @@ static void open_socket_out_defer_waited(struct async_req *subreq)
 	if (async_req_nomem(subreq2, req)) {
 		return;
 	}
-	subreq2->async.fn = open_socket_out_defer_connected;
-	subreq2->async.private_data = req;
+	tevent_req_set_callback(subreq2, open_socket_out_defer_connected, req);
 }
 
 static void open_socket_out_defer_connected(struct tevent_req *subreq)
 {
-	struct async_req *req = talloc_get_type_abort(
-		subreq->async.private_data, struct async_req);
+	struct async_req *req =
+		tevent_req_callback_data(subreq, struct async_req);
 	struct open_socket_out_defer_state *state = talloc_get_type_abort(
 		req->private_data, struct open_socket_out_defer_state);
 	NTSTATUS status;
diff --git a/source3/lib/wb_reqtrans.c b/source3/lib/wb_reqtrans.c
index 65906dcb91..63a25fb896 100644
--- a/source3/lib/wb_reqtrans.c
+++ b/source3/lib/wb_reqtrans.c
@@ -103,8 +103,7 @@ struct async_req *wb_req_read_send(TALLOC_CTX *mem_ctx,
 		goto nomem;
 	}
 
-	subreq->async.fn = wb_req_read_done;
-	subreq->async.private_data = result;
+	tevent_req_set_callback(subreq, wb_req_read_done, result);
 	return result;
  nomem:
 	TALLOC_FREE(result);
@@ -140,8 +139,8 @@ static ssize_t wb_req_more(uint8_t *buf, size_t buflen, void *private_data)
 
 static void wb_req_read_done(struct tevent_req *subreq)
 {
-	struct async_req *req = talloc_get_type_abort(
-		subreq->async.private_data, struct async_req);
+	struct async_req *req =
+		tevent_req_callback_data(subreq, struct async_req);
 	struct req_read_state *state = talloc_get_type_abort(
 		req->private_data, struct req_read_state);
 	int err;
@@ -213,8 +212,7 @@ struct async_req *wb_req_write_send(TALLOC_CTX *mem_ctx,
 	if (subreq == NULL) {
 		goto fail;
 	}
-	subreq->async.fn = wb_req_write_done;
-	subreq->async.private_data = result;
+	tevent_req_set_callback(wb_req_write_done, result);
 	return result;
 
  fail:
@@ -224,8 +222,8 @@ struct async_req *wb_req_write_send(TALLOC_CTX *mem_ctx,
 
 static void wb_req_write_done(struct tevent_req *subreq)
 {
-	struct async_req *req = talloc_get_type_abort(
-		subreq->async.private_data, struct async_req);
+	struct async_req *req =
+		tevent_req_callback_data(subreq, struct async_req);
 	int err;
 	ssize_t ret;
 
@@ -266,8 +264,7 @@ struct async_req *wb_resp_read_send(TALLOC_CTX *mem_ctx,
 	if (subreq == NULL) {
 		goto nomem;
 	}
-	subreq->async.fn = wb_resp_read_done;
-	subreq->async.private_data = result;
+	tevent_req_set_callback(subreq, wb_resp_read_done, result);
 	return result;
 
  nomem:
@@ -293,8 +290,8 @@ static ssize_t wb_resp_more(uint8_t *buf, size_t buflen, void *private_data)
 
 static void wb_resp_read_done(struct tevent_req *subreq)
 {
-	struct async_req *req = talloc_get_type_abort(
-		subreq->async.private_data, struct async_req);
+	struct async_req *req =
+		tevent_req_callback_data(subreq, struct async_req);
 	struct resp_read_state *state = talloc_get_type_abort(
 		req->private_data, struct resp_read_state);
 	uint8_t *buf;
@@ -367,8 +364,7 @@ struct async_req *wb_resp_write_send(TALLOC_CTX *mem_ctx,
 	if (subreq == NULL) {
 		goto fail;
 	}
-	subreq->async.fn = wb_resp_write_done;
-	subreq->async.private_data = result;
+	tevent_req_set_callback(subreq, wb_resp_write_done, result);
 	return result;
 
  fail:
@@ -378,8 +374,8 @@ struct async_req *wb_resp_write_send(TALLOC_CTX *mem_ctx,
 
 static void wb_resp_write_done(struct tevent_req *subreq)
 {
-	struct async_req *req = talloc_get_type_abort(
-		subreq->async.private_data, struct async_req);
+	struct async_req *req =
+		tevent_re_callback_data(subreq, struct async_req);
 	int err;
 	ssize_t ret;