如何在打开“ raw（）”设置的情况下终止ncurses程序？

Question

In order to save time, I'd like to know if there's a professional way to terminate an unresponsive ncurses program (from the terminal) with the raw() setting turned on. Here, CTRL+C Won't help.

Example progam:

#include <ncurses.h>

int main()
{
    initscr();
    raw();

    while(1)
    {
        printw("Yello\n");
    }

    refresh();
    endwin();

    return 0;
}

Answer 1

Whenever you hit the Control-C ( Cc ) combination, the terminal parses it and then sends a signal (SIGINT) to whatever application is running in the foreground. Control-C has no special meaning to the operating system, only to the terminal.

When you call ncurses' raw() or cbreak() function, it essentially instructs the terminal to ignore these special characters and pass them on directly to whatever's running in the foreground, essentially instructing the terminal that the application "knows what it's doing".

So yes, you would have to "manually" (ie from another terminal) kill the running application:

ps aux | grep your_executable_name
kill the_pid

Yes, you can do this while in a TTY. And yes, you can jam your whole system if you lock all available TTYs (and don't have SSH access).