From affe7cf5b4ad27fb26145f628e712da135bfbd04 Mon Sep 17 00:00:00 2001
From: vanhauser-thc <vh@thc.org>
Date: Sun, 25 May 2025 11:38:05 +0200
Subject: [PATCH] set errno=0 when no afl-fuzz present

---
 instrumentation/afl-compiler-rt.o.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/instrumentation/afl-compiler-rt.o.c b/instrumentation/afl-compiler-rt.o.c
index b6ebd5c2..c06644df 100644
--- a/instrumentation/afl-compiler-rt.o.c
+++ b/instrumentation/afl-compiler-rt.o.c
@@ -940,7 +940,12 @@ static void __afl_start_forkserver(void) {
 
     }
 
-    if (write(FORKSRV_FD + 1, msg, 4) != 4) { _exit(1); }
+    if (write(FORKSRV_FD + 1, msg, 4) != 4) {
+
+      errno = 0;
+      _exit(1);
+
+    }
 
     // Now send the parameters for the set options, increasing by option number