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bug#49449: 28: TLS connection never gets to "open" stage

From: Lars Ingebrigtsen
Subject: bug#49449: 28: TLS connection never gets to "open" stage
Date: Sat, 10 Jul 2021 18:57:45 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Mattias Engdegård <mattiase@acm.org> writes:

> 10 juli 2021 kl. 18.27 skrev Lars Ingebrigtsen <larsi@gnus.org>:
>> Hm...  does reverting 234bf1b6363a3d5db8e73c422d87a0bf1aa4b2e3 help any
>> here?
> No, sorry. (Was worth a shot, though!)

Darn!  Well, back to your patch:

-  while ((ret = gnutls_handshake (state)) < 0)
+  if (non_blocking && proc->gnutls_handshakes_tried < 1)
-      if (emacs_gnutls_handle_error (state, ret) == 0) /* fatal */
-       break;
+      /* HACK: don't succeed the first time for nonblocking connections,
+        because the logic doesn't allow it (bug#49449).  */
+      ret = GNUTLS_E_AGAIN;

I'm not super enthusiastic about this -- it'll artificially make
connections slower?  The problem only seems to occur on Macos, so
it'd be interesting to find out why it doesn't happen on Linux...

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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