> From: "Theo de Raadt" <dera...@openbsd.org>
> Date: Wed, 08 Jul 2020 09:42:41 -0600
>
> I think we need something like this.
>
> Documenting it will be a challenge.
>
> I really don't like the name as is too generic, when the control is only
> for a narrow set of "current time" system calls.
I'm not sure we should be using getenv() in this early initialization
function though.
> Ted Unangst <t...@tedunangst.com> wrote:
>
> > Not sure how useful this will be, but I think it could be helpful to still
> > see section (2) functions in ktrace, even if there's magic to avoid that.
> >
> > As proof of concept, if env LIBC_NOSYSWRAPPERS is set, the libc timecounters
> > are turned off. Now I see lots of gettimeofday syscalls in ktrace again.
> >
> > Is this better than switching to ltrace? Combined ktrace and ltrace output
> > is fairly messy, but it seems to work. Setting it up to trace just a few
> > functions and all the system calls is a bit more involved.
> >
> >
> > Index: init.c
> > ===================================================================
> > RCS file: /home/cvs/src/lib/libc/dlfcn/init.c,v
> > retrieving revision 1.8
> > diff -u -p -r1.8 init.c
> > --- init.c 6 Jul 2020 13:33:05 -0000 1.8
> > +++ init.c 8 Jul 2020 08:13:07 -0000
> > @@ -114,6 +114,8 @@ _libc_preinit(int argc, char **argv, cha
> > _timekeep->tk_version != TK_VERSION)
> > _timekeep = NULL;
> > }
> > + if (issetugid() == 0 && getenv("LIBC_NOSYSWRAPPERS"))
> > + _timekeep = NULL;
> > break;
> > }
> > }
> >
>
>
