something about ptrace field in task_struct

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Hi,

   As a field of the type of task_struct, ptrace seems to be
pertaining to debugger. I have three questions about it.

1.  What's the content of the ptrace field and who is responsible to set it?
2.  When a debugger acting on a process A, A creates its child process
B. Then, how ptraces of A and B reflcet this situation.
3.  Some status of a process can be queried through the
/proc/pid/status, but there seemingly is no information about the
ptrace besides a  stat named 'ptracer'. Is there any way to query it?

Or, any clues of documentations about it will be appreciated yet. Thx.

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