From e64c914319b087986ca29df6b1027d1de51dde58 Mon Sep 17 00:00:00 2001
From: Red Bear OS <build@redbearos.org>
Date: Sat, 18 Jul 2026 20:33:03 +0900
Subject: [PATCH] DIAG(spawn): emit trace to fd2 (+/scheme/debug); debug:
 scheme path was wrong

---
 src/platform/redox/mod.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/platform/redox/mod.rs b/src/platform/redox/mod.rs
index 51814517c0..cb04d81318 100644
--- a/src/platform/redox/mod.rs
+++ b/src/platform/redox/mod.rs
@@ -1265,7 +1265,10 @@ impl Pal for Sys {
     ) -> Result<pid_t> {
         use crate::header::spawn::Flags;
         let dbg = |m: &str| {
-            if let Ok(g) = FdGuard::open("debug:", syscall::O_WRONLY) {
+            // fd 2 (login's stderr -> pty -> fbcond -> serial) is proven to
+            // reach the capture; also try the kernel debug scheme directly.
+            let _ = syscall::write(2, m.as_bytes());
+            if let Ok(g) = FdGuard::open("/scheme/debug", syscall::O_WRONLY) {
                 let _ = syscall::write(g.as_raw_fd(), m.as_bytes());
             }
         };