[riot-notifications] [RIOT-OS/RIOT] sock/async: add function to retrieve session object of current DTLS event (#15755)

János Brodbeck notifications at github.com
Wed Jan 13 12:14:22 CET 2021

@janosbrodbeck commented on this pull request.

> @@ -87,6 +87,7 @@ static int _read(struct dtls_context_t *ctx, session_t *session, uint8_t *buf,
     sock->buffer.session = session;
     if (sock->async_cb != NULL) {
+        memcpy(&sock->async_cb_session, session, sizeof(session_t));

The problem I had with a pointer was that I cannot set the pointer to NULL after the callback call.
sock->async_cb_session = session;
sock->async_cb(sock, SOCK_ASYNC_MSG_RECV, sock->async_cb_arg);
sock->async_cb_session = NULL;
The session is already NULL again when I call `sock_dtls_get_event_session` within the DTLS handler. 

No, `sock_dtls_get_event_session` should have no use case outside of the handler. It's not even guaranteed that you get a proper information out of it outside the handler.

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