first commit

poweroff_linux/send_signal.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+TTY_DEVICE="/dev/ttyACM0"
+# 参数为 "poweroff", "halt", "reboot"等
+ACTION=$1
+
+# 当关机(poweroff)或重启(reboot)时才发送
+if [ "$ACTION" = "poweroff" ] ; then
+    if [ -w "$TTY_DEVICE" ]; then
+        stty -F "$TTY_DEVICE" 115200 cs8 -cstopb -parenb
+        printf "ok\r\n" > "$TTY_DEVICE"
+    fi
+fi
+exit 0