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SubjectRe: The purpose of PT_TRACESYSGOOD

>> What's the effect of PT_TRACESYSGOOD flag? I found it's used only set
>> in ptrace_setoptions, which is called in the function
>> ptrace_request. And the PT_TRACESYSGOOD flag will be requested in
>> do_syscall_trace. What's the purpose of that flag?

* A child stopped at a syscall has status as if it received SIGTRAP.
* In order to distinguish between SIGTRAP and syscall, some kernel
* versions have the PTRACE_O_TRACESYSGOOD option, that sets an extra
* bit 0x80 in the syscall case.
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