Messages in this thread | | | Date | Tue, 14 Mar 2006 15:00:55 -0500 | From | Jeff Dike <> | Subject | Re: What is ptrace flag PT_TRACESYSGOOD for? |
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On Tue, Mar 14, 2006 at 05:26:52AM -0500, Chuck Ebbert wrote: > I am trying to document PTRACE_SETOPTIONS and I can't figure out what > the option PTRACE_O_TRACESYSGOOD is used for.
It makes it easier to distinguish between the child receiving a SIGTRAP and making a system call. On x86, without TRACESYSGOOD, you can see if orig_eax == -1 to check for a real SIGTRAP. I'm not sure about the other arches, but it's nice to have an arch-independent way of doing it, even if there are equivalents in every arch.
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