aio: introduce NNG_ESTOPPED

This error code results when an AIO is stopped permanently, as a result
of nni_aio_close or nni_aio_stop.  The associated AIO object cannot be
used again.  This discrimantes against a file being closed, or a temporary
cancellation which might allow the aio to be reused.

Consumers must check for this error status in their callbacks, and not
resubmit an operation that failed with this error.  Doing so, will result
in an infinite loop of submit / errors.

1 files changed, 21 insertions, 0 deletions

diff --git a/src/sp/protocol/survey0/respond_test.c b/src/sp/protocol/survey0/respond_test.c
index 0260dc30..ad8f7e60 100644
--- a/src/sp/protocol/survey0/respond_test.c
+++ b/src/sp/protocol/survey0/respond_test.c
@@ -257,6 +257,26 @@ test_resp_ctx_recv_aio_stopped(void)
 	nng_aio_stop(aio);
 	nng_ctx_recv(ctx, aio);
 	nng_aio_wait(aio);
+	NUTS_FAIL(nng_aio_result(aio), NNG_ESTOPPED);
+	NUTS_PASS(nng_ctx_close(ctx));
+	NUTS_CLOSE(resp);
+	nng_aio_free(aio);
+}
+
+void
+test_resp_ctx_recv_aio_canceled(void)
+{
+	nng_socket resp;
+	nng_ctx    ctx;
+	nng_aio   *aio;
+
+	NUTS_PASS(nng_respondent0_open(&resp));
+	NUTS_PASS(nng_aio_alloc(&aio, NULL, NULL));
+	NUTS_PASS(nng_ctx_open(&ctx, resp));
+
+	nng_ctx_recv(ctx, aio);
+	nng_aio_cancel(aio);
+	nng_aio_wait(aio);
 	NUTS_FAIL(nng_aio_result(aio), NNG_ECANCELED);
 	NUTS_PASS(nng_ctx_close(ctx));
 	NUTS_CLOSE(resp);
@@ -548,6 +568,7 @@ TEST_LIST = {
 	{ "respond close pipe before send", test_resp_close_pipe_before_send },
 	{ "respond close pipe during send", test_resp_close_pipe_during_send },
 	{ "respond recv aio ctx stopped", test_resp_ctx_recv_aio_stopped },
+	{ "respond recv aio ctx canceled", test_resp_ctx_recv_aio_canceled },
 	{ "respond close pipe context send",
 	    test_resp_close_pipe_context_send },
 	{ "respond close context send", test_resp_close_context_send },