On Tue, 17 May 2016 20:29:12 +0800, walkerlala said:
Can I just disable interrupts from hardwares? I know that, at the very beginning, the kernel disable interrupt for convenient. So I wonder whether we can do thing like this.
Sure you can do that. But then, how do you get the kernel's attention?
Put it in another way: when we "interact" with a Linux Desktop, there are also many programs running underneath as daemons, but we can still do our own works without even noting their existing. So I wonder, is there a similar way that we can use to interact with the kernel (without using a debugger) ?
Try this: Start up Xorg and your preferred window manager. Open an xterm or a Gnome-terminal or whatever.
From that window, try to attach gdb to the Xorg process:
% ps ax|grep Xorg 1791 tty2 S+ 69:42 /usr/libexec/Xorg vt2 -displayfd 3 -auth /run/user/967/gdm/Xauthority -nolisten tcp -background none -noreset -keeptty -verbose 3 62036 pts/0 S+ 0:00 grep Xorg % gdb -p 1791 What happens? Why does it happen? Eventually, you'll figure out what Xorg and the kernel have in common here....