From 24f1d8a6823c9766216afde861ff3acffd167aeb Mon Sep 17 00:00:00 2001
From: AskaEth <i@yeij.top>
Date: Wed, 11 Nov 2026 19:38:00 +0800
Subject: [PATCH] =?UTF-8?q?docs(m53):=20timeout=20=E4=B8=8A=E5=8D=A1?=
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---
 scripts/build/DEVKIT.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/scripts/build/DEVKIT.md b/scripts/build/DEVKIT.md
index aa7faa1..77f5456 100644
--- a/scripts/build/DEVKIT.md
+++ b/scripts/build/DEVKIT.md
@@ -162,6 +162,16 @@ timeout 8 bluetoothctl connect XX:XX:XX:XX:XX:XX      # 挂死的外部命令的
 - 不支持 `--preserve-status` / `-v` / `d` 后缀，给了会明确报 125（不静默忽略）。
 - 不跟踪 `setsid()` 逃出进程组的守护进程（coreutils 也不跟踪）。
 
+**5 行自检（每次上卡后复跑，全绿才算 timeout 可用）**：
+
+```sh
+T=/usr/data/mnt/sd_0/MeowOS/opt/devkit/bin/timeout
+$T 2 sleep 30; echo "t1=$? (want 124)"; $T -s KILL 2 sleep 30; echo "t2=$? (want 137)"
+$T 2 sleep 1;   echo "t3=$? (want 0)"
+$T 5 sh -c 'sleep 100 & sleep 100 & wait'; echo "t4=$? (want 124)"
+for p in /proc/[0-9]*; do [ "$(cat $p/comm 2>/dev/null)" = sleep ] && echo "LEAK $p"; done
+```
+
 ## 4. exFAT 语义（权限 / 软链）
 
 设备挂载：`/dev/mmcblk0 on /usr/data/mnt/sd_0 type exfat (rw, fmask=0022, dmask=0022, symlink=0, noexec 未设置)`。