On Sat, Oct 04, 2008 at 09:20:00AM +0200, stephane eranian wrote:
> David,
>
> On Sat, Oct 4, 2008 at 8:05 AM, David Gibson
> <[EMAIL PROTECTED]> wrote:
> >>
> >> If we wanted to go even further, we could combine start/stop, attach/detach
> >> into a single syscall:
> >
> > Well, you could. But the attach/detach take a parameter which
> > start/stop don't, making it a less obvious merge to make.
> >
> Unless you make the 3rd argument optional and hide this in a
> user library. This is how this is handled for pfm_create_session()
> for instance. The library would define this as follows:
>
> int pfm_control_session(int fd, int flags, ...);
>
> Based upon flags, it would use va_arg() to get to the 3rd argument and
> pass it to the syscall which implements the version below. A dummy value
> would be passed with the flags is not equal to PFM_CTFL_ATTACH.
Yeah, that's what I'm saying. You could do it, but it feels like
you're forcing it, at least to me. As you say it starts to look a bit
like ioctl() again.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
perfmon2-devel mailing list
perfmon2-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
