[Mono-dev] Unix.Native

[Rodrigo Kumpera]

I agree we would be better with a better error message.

Said that, right now Mono.Posix lacks a more dedicated maintainer and it
would be lovely if you
could bring some love to it. :)

On Mon, Jan 12, 2015 at 8:39 PM, Greg Young <gregoryyoung1 at gmail.com> wrote:

> There are a ton to surface ... I just ran into this one :)
>
> In general I agree with you surfacing is better I was thinking just
> letting me call it if it doesn't understand it (or having a better
> message) would be useful. I spun for hours thinking what was wrong
> with my parameters to the call thinking it for some undocumented
> reason was returning EINVAL :)
>
> On Tue, Jan 13, 2015 at 3:30 AM, Rodrigo Kumpera <kumpera at gmail.com>
> wrote:
> > That would change the behavior of the function and translate into a more
> > fragile API.
> >
> > The way to go is to surface this option.
> >
> > On Mon, Jan 12, 2015 at 8:23 PM, Greg Young <gregoryyoung1 at gmail.com>
> wrote:
> >>
> >> I figured out why after a while of looking. The C code translates the
> >> argument
> >>
> >> int Mono_Posix_FromFcntlCommand (int x, int *r)
> >>
> >> When its something that is not a known command it returns EINVAL.
> >> Might a better option be to try to let it pass through otherwise how
> >> could I call for instance a value on a ac?
> >>
> >> Cheers,
> >>
> >> Greg
> >>
> >> On Tue, Jan 13, 2015 at 2:28 AM, Greg Young <gregoryyoung1 at gmail.com>
> >> wrote:
> >> > I have been trying to set F_NOCACHE via fcntl on a mac to no avail.
> >> >
> >> >                  r = Syscall.fcntl
> >> > (handle.DangerousGetHandle().ToInt32(), (FcntlCommand) MAC_F_NOCACHE,
> >> > 1);
> >> >                  } while (UnixMarshal.ShouldRetrySyscall ((int) r));
> >> >                  if (r == -1)
> >> >                      UnixMarshal.ThrowExceptionForLastError ();
> >> >
> >> > (EINVAL)
> >> >
> >> > I have tried
> >> > 48
> >> > 0x400
> >> > and 0x40000
> >> > for F_NOCACHE though from
> >> >
> >> >
> https://github.com/realthunder/mac-headers/blob/master/usr/include/sys/fcntl.h#L256
> >> >
> >> > Given FcntlCommandFlags does not expose F_NOCACHE but it still should
> >> > be fine to jam the value into the enum
> >> >
> >> > Has anyone set this before? Chances of finding this on google are
> >> > slightly better than 0 :)
> >> >
> >> > Cheers,
> >> >
> >> > Greg
> >> > --
> >> > Studying for the Turing test
> >>
> >>
> >>
> >> --
> >> Studying for the Turing test
> >> _______________________________________________
> >> Mono-devel-list mailing list
> >> Mono-devel-list at lists.ximian.com
> >> http://lists.ximian.com/mailman/listinfo/mono-devel-list
> >
> >
>
>
>
> --
> Studying for the Turing test
>
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