[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: Friday, December 6, 2013 10:47:37 PM
> Subject: [lttng-dev] What are sys calls starting with compat?

> Can someone kindly explain the difference between system calls starting with
> "compat" prefix and regular system calls?

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. 

Thanks, 

Mathieu 

> Compat system calls do not appear in the system call table:
> http://syscalls.kernelgrok.com/ . However, I did found them in the source
> code of Linux.

> Thanks,
> Shariyar

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