[Mono-dev] Unix.Native

[Greg Young]

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
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>
>



-- 
Studying for the Turing test