System call interception by jprobe

[edsionte]

Hi, guys,

I am trying to use jprobe to intercept syscalls in linux kernel.
Such as open(),the original flow is open()-->sys_open(),
and now,
open()-->check_file()-->sys_oepn()
The check_file() is jprobe's entry point.

If check_file() returns sucessfully, jprobe_return() will be called and
sys_open() will be running, or the open() return and user gets errno in
user space.
And the problem is, I have no idea what jprobe should return when I want to
end open() flow.

Any hint will be deeply appreciated.
Thanks in advance.
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