Question about rr alternative design

Octav Chipara ochipara at
Tue Feb 20 20:17:38 UTC 2018

Thank you for your replies. 

On an unrelated topic, I am trying to obtain a recording of nginx. However, if I start it from the command line, rr does not record any data (perhaps it is not following child processes). If this is not support, is it possible to attach rr to a running process?

— Octav

> On Feb 20, 2018, at 2:09 PM, Robert O'Callahan <robert at> wrote:
> On Wed, Feb 21, 2018 at 8:30 AM, Nathan Froyd <nfroyd at <mailto:nfroyd at>> wrote:
> I don't know whether this alternative was considered
> Wrapping libc calls was considered. Section 3.1 of the extended technical report mentions it. As Nathan and Kyle said, it's simpler and more comprehensive to intercept system calls directly rather than wrap libc functions.
> Rob
> -- 
> Su ot deraeppa sah dna Rehtaf eht htiw saw hcihw, efil lanrete eht uoy ot mialcorp ew dna, ti ot yfitset dna ti nees evah ew; deraeppa efil eht. Efil fo Drow eht gninrecnoc mialcorp ew siht - dehcuot evah sdnah ruo dna ta dekool evah ew hcihw, seye ruo htiw nees evah ew hcihw, draeh evah ew hcihw, gninnigeb eht morf saw hcihw taht.

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