Re: What is ptrace flag PT_TRACESYSGOOD for?

[Jeff Dike]

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.

				Jeff
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