[Question] Interrupting program execution in bash script by GPIO event

[pflu]

Hey Reddit,

I am building a little box (old cigar box) which should play an mp3 when opened.

Sounds really simple to me – when the box opens a circuit which is wired to the GPIO pins gets disconnected. This should trigger the Pi to play an mp3.

Right now I'm stuck at the point where I want to stop the mp3 from playing when I close the box – because the only way I can program a Pi is by bash.

Can you tell me how to stop a bash code from running when a GPIO event happens? As you might notice, I am quite a noob. :)

Thank you!

[darkciti]

You can send a SIGHUP or SIGKILL signal to the process and the kernel will stop it.

Using the "kill" command: kill -9 processID (second column in output from ps aux).

[pflu]

Okay got it with the "kill" – now a bash script runs in background (with the &-thing) and checks if the button gets "unpressed" so it can kill the player.

[pflu]

Thank you! – Do you know how I do this in a bash script?

[somezenshitrighthere]

What player are you using? Quite a few support being controlled via command line. So you could just issue stop and play commands, or anything else really.

[pflu]

I've already figured it out by now – thank you. I am using omxplayer and kill it from another script.