std::atexit

cppreference.com

Example

Run on Compiler Explorer

atexit_handler_1: () = {
    std::cout << "At exit #1\n";
}

atexit_handler_2: () = {
    std::cout << "At exit #2\n";
}

main: () -> int = {
    result_1: const int = std::atexit(atexit_handler_1);
    result_2: const int = std::atexit(atexit_handler_2);
 
    if result_1 || result_2 {
        std::cerr << "Registration failed!\n";
        return EXIT_FAILURE;
    }
 
    std::cout << "Returning from main...\n";
    return EXIT_SUCCESS;
}

Output

Returning from main...
At exit #2
At exit #1