Problem description

About problem

When run from a script, the termux-vibrate command terminates according to the shell/interpreter, but it can still block the terminal and corrupt pipes and standard streams for other commands executed afterwards. I did not notice this behavior on Android 13/14, but it appears on Android 15/16. As an example, in my implementation, running jq after termux-vibrate produces corrupted output.

Examples

The attached screenshots show, in order, the output using termux-vibrate -d 50 as the vibration engine (between output records), and in the second one the same output using echo -en "\a" (bell).

Steps to reproduce

Example Bash script to reproduce:

#!/data/data/com.termux/files/usr/bin/bash

while true; do
    raw=`termux-wifi-scaninfo 2>/dev/null || true`
    [ -z "$raw" ] && return 1

    printf "%s" "$raw" | jq -c '.[] | {ssid:.ssid,bssid:.bssid,rssi:.rssi,frequency_mhz:.frequency_mhz,capabilities:.capabilities}' | while IFS= read -r line; do
        ssid=$(printf "%s" "$line" | jq -r '.ssid')
        bssid=$(printf "%s" "$line" | jq -r '.bssid')
        rssi=$(printf "%s" "$line" | jq -r '.rssi')
        freq=$(printf "%s" "$line" | jq -r '.frequency_mhz')
        caps=$(printf "%s" "$line" | jq -r '.capabilities')
        echo "$ssid" "$bssid" "$rssi" "$freq" "$caps"
        case $1 in
            bell) echo -en "\a" ;;
            vibrate) termux-vibrate -d 50 ;;
        esac
    done
done

How to use:

1. Run the script.
2. If no parameter is given, everything works fine.
3. If the parameter bell is used, everything works fine.
4. If the parameter vibrate triggers termux-vibrate, the terminal may block and subsequent commands like jq produce corrupted output.

Expected behavior

termux-vibrate should execute the vibration without interfering with the terminal, pipes, or standard streams of other commands, regardless of Android version.

Additional information

• termux-api application version: 0.53.0
• termux-api package version (installed through apt): 0.59.1-1
• Android OS version: 15/16
• Device model: Nubia NX769J/NX809J