Initial.

module.prop

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+id=termux-watchdog
+name=Termux Watchdog
+version=1.0
+versionCode=1
+author=tenkuma
+description=Reboots the device when the Termux app disappears.

service.sh

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+#!/system/bin/sh
+# -------------------------------------------------
+# Magisk service script – starts the watchdog daemon
+# -------------------------------------------------
+
+nohup /system/bin/termux_watchdog >/dev/null 2>&1 &

system/bin/termux_watchdog

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+#!/system/bin/sh
+LOG="/data/local/tmp/termux_watchdog.log"
+echo "$(date): Watchdog launched (PID=$)" >> "$LOG"
+
+# ---------- Wait for Termux ----------
+while true; do
+    TERMUX_PID=$(pidof -s com.termux)
+    if [ -n "$TERMUX_PID" ]; then
+        echo "$(date): Detected Termux (PID=$TERMUX_PID)" >> "$LOG"
+        break
+    fi
+    sleep 5
+done
+
+# ---------- Monitor ----------
+while true; do
+    TERMUX_PID=$(pidof -s com.termux)
+    if [ -z "$TERMUX_PID" ]; then
+        echo "$(date): Termux no longer running -> reboot" >> "$LOG"
+        reboot
+        break
+    fi
+    sleep 5
+done