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Re: [PATCH 1/4] 'catch syscall' feature -- Architecture-independent part
On Fri, 2008-11-07 at 12:06 +0000, Pedro Alves wrote:
> If there any other way to distinguish entry/exit other than a toggle?
> Toggles are prone to be fallible. E.g., if you *attach* to a program that
> is doing a long syscall, and then start tracing that syscall,
> is it possible that you hit the syscall exit first, so your toggle will
> be inverted? That is, you'll report a syscall entry, when in fact, it
> was a syscall exit, and so on for the following syscalls of the same lwp.
The way the patch is designed now, GDB will have exactly this behaviour
(inverting syscall entry/exit). If you can think of a better way to do
it so that GDB doesn't get confused, I'd be glad to implement.
Sérgio Durigan Júnior
Linux on Power Toolchain - Software Engineer
Linux Technology Center - LTC