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poll: add comment

From: Bruno Haible
Subject: poll: add comment
Date: Sun, 30 Jun 2019 14:49:03 +0200
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2019-06-30  Bruno Haible  <address@hidden>

        poll: Add comment.
        * lib/poll.c: Add comment about WSAPoll.

diff --git a/lib/poll.c b/lib/poll.c
index f6de24c..5d9150c 100644
--- a/lib/poll.c
+++ b/lib/poll.c
@@ -76,6 +76,13 @@
+/* Do *not* use the function WSAPoll
+   because there is a bug named “Windows 8 Bugs 309411 - WSAPoll does not
+   report failed connections” that Microsoft won't fix.
+   See Daniel Stenberg: "WASPoll is broken"
+   <https://daniel.haxx.se/blog/2012/10/10/wsapoll-is-broken/>.  */
 /* Here we need the recv() function from Windows, that takes a SOCKET as
    first argument, not any possible gnulib override.  */
 # undef recv

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