Re: The purpose of PT_TRACESYSGOOD

[Andries Brouwer]

>> 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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