From 5eb55ad8a70ef948432ba17e0985c7b4d3b13c25 Mon Sep 17 00:00:00 2001
From: Matt Caswell <matt@openssl.org>
Date: Fri, 28 Feb 2025 11:52:08 +0000
Subject: [PATCH] Fix a compilation failure in AIX

AIX (at least for 7.1)  defines some macros for "events" and "revents" which
interferes with our own use of these names.

Fixes #24236

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26933)
---
 ssl/rio/poll_immediate.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/ssl/rio/poll_immediate.c b/ssl/rio/poll_immediate.c
index 38afaf5157..cfdfa13674 100644
--- a/ssl/rio/poll_immediate.c
+++ b/ssl/rio/poll_immediate.c
@@ -15,6 +15,16 @@
 #include "../ssl_local.h"
 #include "poll_builder.h"
 
+#if defined(_AIX)
+/*
+ * Some versions of AIX define macros for events and revents for use when
+ * accessing pollfd structures (see Github issue #24236). That interferes
+ * with our use of these names here. We simply undef them.
+ */
+# undef revents
+# undef events
+#endif
+
 #define ITEM_N(items, stride, n) \
     (*(SSL_POLL_ITEM *)((char *)(items) + (n)*(stride)))