Node: SIGINT not triggering with readline

[felipenmoura]

When using readline, the process.on('SIGINT', ...) is never triggered.
Is that planned, or perhaps a bug?
I searched and did not find other issues about it.

[evanlucas]

Hi @felipenmoura. Thanks for the report. Could you possibly give us a reduced test case with no external dependencies that shows this behavior so we can reproduce? Thanks!

[Fishrock123]

@felipenmoura If you are trying to trigger by ctrl+C, that won't work, because readline catches the keys?

[felipenmoura]

Yep.
That's what is happening.
It's being discussed in Inquirer.js, here: https://github.com/SBoudrias/Inquirer.js/issues/293#issuecomment-172282009
Inquirer uses realine internally, therefore, who uses it cannot catch the SIGINT!

By the way, a test case:

process.on('SIGINT', function(){
    console.log('oh, you triggered it!');
});

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

rl.question('What do you think of Node.js? ', (answer) => {
    console.log('Thank you for your valuable feedback, which was:\n', answer);
    rl.close();
});

[Fishrock123]

So, readline is actually handles it, but only if it thinks it's input is a TTY: https://github.com/nodejs/node/blob/master/lib/readline.js#L693-L701

[addaleax]

Adding the SIGINT listener on the readline instance itself instead of process should work?

[bnoordhuis]

This looks to have been solved for some time now so I'll go ahead and close the issue. Holler if it should be reopened.