Messages in this thread | | | Date | Tue, 14 Mar 2006 20:13:12 -0500 | From | Jeff Dike <> | Subject | Re: What is ptrace flag PT_TRACESYSGOOD for? |
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On Wed, Mar 15, 2006 at 12:00:56AM +0100, Pavel Machek wrote: > Yes.. and unless you deliver ptrace() syscall stops with different > signal, you can't tell difference between syscall stop and real > SIGTRAP.
You can, but you have to examine registers in order to do this. This is a concern when running gdb inside UML. gdb breakpoints will cause real SIGTRAPs, while system calls cause synthetic ones. Before switching to TRACESYS_GOOD, UML examined orig_eax to distinguish between them.
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