Re: bhyve fopen failure

On Tue, Mar 2, 2021 at 10:13 AM Mark Johnston <markj_at_freebsd.org> wrote:
>
> On Tue, Mar 02, 2021 at 09:31:22AM -0800, Chuck Tuffli wrote:
> > I'm porting some code to bhyve and am getting a failure I don't
> > understand. This is git as of af11c2029006 FWIW.
> >
> > The code in question is for an emulated device and looks like:
> >     dbg = fopen("/tmp/bhyve_ata.log", "w+");
> >     if (dbg == NULL)
> >         perror("fopen");
> >
> > Running this fails with:
> >     fopen: Not permitted in capability mode
> > Googling suggests this might be capsicum related. If so, what do I
> > need to change to allow writes to a debug file?
>
> You would need to either open the file in the driver's initialization
> routine, which I believe is executed before bhyve enters capability
> mode, or add -DWITHOUT_CAPSICUM to the bhyve CFLAGS and recompile.

Thanks to you both; that did the trick. I was confused as other
emulated devices are doing the same thing, but there must be an
ordering difference that allows them to work (I assume).

--chuck