问题
First, a bit of background: I'm running the latest stable build of Crunchbang Linux inside a VirtualBox VM. I'm designing a custom text-based user interface to run on top of bash. This is being done with a combination of C++ and bash scripts.
I need to, at times, completely and totally remove the ability for the user to provide the system with any sort of standard keyboard input. This is because, when I run a part of the system, the user is forced to wait for certain amounts of time.
Unfortunately, the user can still type while this is going on, and whatever they type is put on the screen. This happens when I'm running a C++ program as well as a bash script. The reason this is a problem is that there is text on the screen which the user is to read, and if they can type, it displaces the text. There will be other uses for this later, as well, like making the system seem like it has frozen up.
So, the question - How do I
- disable the keyboard, or
- prevent anything pressed on the keyboard from showing up on the screen?
回答1:
Turn off echo mode with stty -echo or the equivalent C code (which would use tcgetattr and tcsetattr). When you are ready to accept input again, turn it back on. You may also wish to discard the input that arrived while you weren't expecting it. That would be done with tcflush but be aware that some users (like me) would consider that an annoyance. Typeahead is a feature, not a bug!
回答2:
To see how user input to a certain process or tty can be intercepted, the man page and source code of interceptty may be enlightening. (have no experience with it)
However, you can hardly (totally) prevent user input. The user is probably always able to switch to a different virtual terminal (if any) or at least to reboot the system with Alt+Print+B (Magic SysRq_key) if not disabled. It is two different things to ignore input on a given tty and disabling keyboard input altogether.
来源：https://stackoverflow.com/questions/12223736/linux-discard-keyboard-input