Symfony version(s) affected

7.3.3

Description

When using Symfony QuestionHelper and selecting input from a list of choices (ChoiceQuestion), Ctrl-C can leave the terminal in a broken state on Unixy platforms under certain conditions:

• When a signal handler is installed and calls exit
• When xdebug-handler restarts a process composer run: Ctrl+C leaves shell in a broken state composer/composer#12526

The terminal does not show any input and requires a Ctrl-Break and Enter to restart it.

When calling other QuestionHelper functions, Ctrl-C works okay.

Further info

When using a signal handler, this causes the terminal to break:

pcntl_signal(SIGINT, function ($signal) {
    echo 'CRTL_C received, exiting', PHP_EOL;
    exit(2;)
});

But this is okay:

pcntl_signal(SIGINT, function ($signal) {
    echo 'CRTL_C received - continuing', PHP_EOL;
});

When using a restart, SIGINT is set to be ignored in the parent process, then set to its default action in the restarted (child) process because it inherited the ignored state.

if (!self::$inRestart) {
    // Restarting, so ignore SIGINT in parent
    pcntl_signal(SIGINT, SIG_IGN);
} elseif (is_int(pcntl_signal_get_handler(SIGINT))) {
    // Restarted, no handler set so force default action
    pcntl_signal(SIGINT, SIG_DFL);
}

How to reproduce

Demo/reproducer: https://github.com/johnstevenson/sigbug

Possible Solution

Additional Context

No response