[lttng-dev] What are sys calls starting with compat?

[Mathieu Desnoyers]

----- Original Message -----

> From: "Shariyar" <syed.shariyar at gmail.com>
> To: lttng-dev at lists.lttng.org
> Sent: Tuesday, December 10, 2013 2:39:40 PM
> Subject: Re: [lttng-dev] What are sys calls starting with compat?

> What does sys_unknown mean and why doe it occur? Does it mean that LTTng can
> not find the name of system call?

Yes. It means the ID of the system call is unknown to LTTng (e.g. kernel newer than LTTng system call instrumentation). 

Thanks, 

Mathieu 

> Regards,
> Shariyar
> ------------------------------

> Message: 2
> Date: Tue, 10 Dec 2013 15:31:19 +0000 (UTC)
> From: Mathieu Desnoyers < mathieu.desnoyers at efficios.com >
> To: Daniel Thibault < Daniel.Thibault at drdc-rddc.gc.ca >
> Cc: lttng-dev at lists.lttng.org
> Subject: Re: [lttng-dev] What are sys calls starting with compat?
> Message-ID:
> < 1571110803.82672.1386689479225.JavaMail.zimbra at efficios.com >
> Content-Type: text/plain; charset=utf-8

> ----- Original Message -----
> > From: "Daniel Thibault" < Daniel.Thibault at drdc-rddc.gc.ca >
> > To: lttng-dev at lists.lttng.org
> > Cc: "Mathieu Desnoyers" < mathieu.desnoyers at efficios.com >
> > Sent: Tuesday, December 10, 2013 9:57:21 AM
> > Subject: Re: [lttng-dev] What are sys calls starting with compat?
> >
> > > Date: Tue, 10 Dec 2013 01:55:48 +0000 (UTC)
> > >
> > > System calls with "compat" prefix are for e.g. 32-bit processes running
> > > on
> > > a 64-bit kernel:
> > > those processes are using a different system call table (ia32 for Intel)
> > > than 64-bit processes,
> > > and therefore those system calls are named "compat_*" by LTTng.
> > >
> > > Mathieu
> >
> > I presume the LTTng event names will also be prefixed with "compat_".

> Yes.

> > For
> > instance, "compat_sys_rmdir".

> Yes.

> > Or would it be "sys_compat_rmdir"?

> No.

> > And
> > what of the exit_syscall and sys_unknown events?

> exit_syscall has no compat prefix as I recall.

> compat_sys_unknown.

> Thanks,

> Mathieu

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-- 
Mathieu Desnoyers 
EfficiOS Inc. 
http://www.efficios.com 
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