How do I run certain code/function before the program exits in D?

Question

Suppose I have loop which awaits for user input. If user presses Ctrl+C the program exits normally. However, I'd like to do a couple of things before exit. Is it possible to run a function once Ctrl+C was pressed and program is about to exit?

Answer 1

You could use core.stdc.signal, which contains bindings to the C header signal.h. Now, if this is for Windows, you might run into some problems:

SIGINT is not supported for any Win32 application. When a CTRL+Cinterrupt occurs, Win32 operating systems generate a new thread to specifically handle that interrupt. This can cause a single-thread application, such as one in UNIX, to become multithreaded and cause unexpected behavior.

__gshared bool running = true;
extern(C) void handleInterrupt(int) nothrow @nogc
{
    running = false;
}

void main()
{
    import core.stdc.signal;
    signal(SIGINT, &handleInterrupt);

    scope(exit)
    {
        //Cleanup
        import std.stdio : writeln;
        writeln("Done");
    }

    while(running)
    {
        //Do some work
    }
}