From 5c26308b2349768a52e5166a03c441e688ca9cbb Mon Sep 17 00:00:00 2001
From: "Justin C. Miller" <justin@devjustinian.com>
Date: Sun, 11 Sep 2022 14:14:39 -0700
Subject: [PATCH] [kernel] Fix inverted block flag in mailbox_receive

The `block` flag was operating the opposite of its intended behavior.
---
 src/kernel/syscalls/mailbox.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/kernel/syscalls/mailbox.cpp b/src/kernel/syscalls/mailbox.cpp
index 403f7a8..30c172e 100644
--- a/src/kernel/syscalls/mailbox.cpp
+++ b/src/kernel/syscalls/mailbox.cpp
@@ -133,7 +133,7 @@ mailbox_receive(
     if (!self->receive(msg, block)) {
         // No message received
         return self->closed() ? j6_status_closed :
-               block ? j6_status_would_block :
+               !block ? j6_status_would_block :
                j6_err_unexpected;
     }