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....
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