From 0c90ff1429deaa556c0509c13cdd5aef5df9c0d4 Mon Sep 17 00:00:00 2001
From: Vasil Dimov <vd@FreeBSD.org>
Date: Wed, 7 Apr 2021 11:02:25 +0200
Subject: [PATCH] fuzz: set errno from FuzzedSock::Wait() if it simulates a
 failure

---
 src/test/fuzz/util.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/test/fuzz/util.cpp b/src/test/fuzz/util.cpp
index 2da0e84116..9ab7145b8a 100644
--- a/src/test/fuzz/util.cpp
+++ b/src/test/fuzz/util.cpp
@@ -9,7 +9,13 @@
 
 bool FuzzedSock::Wait(std::chrono::milliseconds timeout, Event requested, Event* occurred) const
 {
+    constexpr std::array wait_errnos{
+        EBADF,
+        EINTR,
+        EINVAL,
+    };
     if (!m_fuzzed_data_provider.ConsumeBool()) {
+        SetFuzzedErrNo(m_fuzzed_data_provider, wait_errnos);
         return false;
     }
     if (occurred) *occurred = 0;