From 40a43760fddccdc9b5ca636680fc75a08d6a0d49 Mon Sep 17 00:00:00 2001
From: Charles Oliver Nutter <headius@headius.com>
Date: Tue, 6 Feb 2024 20:17:56 +0100
Subject: [PATCH] Invert this logic to match O_NONBLOCK flag

Fixes #8081
---
 core/src/main/java/org/jruby/RubyIO.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/src/main/java/org/jruby/RubyIO.java b/core/src/main/java/org/jruby/RubyIO.java
index 115c2592799..144660fe82e 100644
--- a/core/src/main/java/org/jruby/RubyIO.java
+++ b/core/src/main/java/org/jruby/RubyIO.java
@@ -2619,9 +2619,9 @@ private IRubyObject ctl(ThreadContext context, IRubyObject cmd, IRubyObject arg)
             return runtime.newFixnum(close_on_exec_p(context).isTrue() ? FD_CLOEXEC : 0);
         } else if (realCmd == Fcntl.F_SETFL.intValue()) {
             if ((nArg & OpenFlags.O_NONBLOCK.intValue()) != 0) {
-                fptr.setBlocking(runtime, true);
-            } else {
                 fptr.setBlocking(runtime, false);
+            } else {
+                fptr.setBlocking(runtime, true);
             }
 
             if ((nArg & OpenFlags.O_CLOEXEC.intValue()) != 0) {