Re: [PATCH 2/5] ptrace: implement PTRACE_SEIZE

From: Tejun Heo
Date: Sat Jun 18 2011 - 04:36:16 EST


On Sat, Jun 18, 2011 at 09:59:38AM +0200, Denys Vlasenko wrote:
> ...unless we plan to introduce PTRACE_O_TRACESTOP (with value 0x00000080)
> which enables PTRACE_INTERRUPT and stop notifications independently
> of PTRACE_SEIZE. Which would be very useful for e.g. strace.

I know you're a big fan of those option flags but I don't really see
the added value in making these behaviors optional rather than keeping
things backward compatible - ie. introducing new event needed to be
gated somehow so the O flags but SEIZE itself serves as a big gate
anyway so I don't see much point in introducing multiple selectable
behaviors. It's not like PTRACE_O_TRACESTOP is gonna make anything
drastically easier or reduce significant amount of overhead.


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