From c56dee6850fd72e4d4d29d559e8855395a591b04 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Sun, 17 Nov 2024 11:48:07 +0100
Subject: [PATCH] multi: add clarifying comment for wakeup_write()

Coverity raised it as a "suspicious sizeof".

Closes #15600
---
 lib/multi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/multi.c b/lib/multi.c
index 263b396d3d..49fddc4720 100644
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -1541,6 +1541,9 @@ CURLMcode curl_multi_wakeup(CURLM *m)
   if(multi->wakeup_pair[1] != CURL_SOCKET_BAD) {
 #ifdef USE_EVENTFD
     buf = &val;
+    /* eventfd has a stringent rule of requiring the 8-byte buffer when
+       calling write(2) on it, which makes the sizeof(buf) below fine since
+       this is only used on 64-bit systems and then the pointer is 64-bit */
 #else
     buf[0] = 1;
 #endif