FIONBIO support in freebsd for bpf

[John Baldwin]

On Tuesday, April 26, 2016 08:49:50 PM Christian Peron wrote:
> Actually, upon inspection of the code, it appears that ioctl(fd, FIONBIO, ..); works as expected. This ioctl cmd appears to be handled further up the stack…

Yes, it's a bit odd, but when F_SETFL tries to set O_NONBLOCK, the kernel
passes FIONBIO down to the device to "ask" if it's ok to use the desired
setting (in *(int *)data) of non-blocking.  In this case bpf is just saying
it supports either setting by returning 0 regardless of the value in data.

> > On Apr 26, 2016, at 8:31 PM, Christian Peron <csjp at sqrt.ca> wrote:
> > 
> > It is supported. If you want to put the descriptor into non-blocking mode, open it up with
> > the device with the O_NONBLOCK flag specified.  It probably wouldn't be too difficult to implement
> > this via ioctl(FIONBIO) but I would need to look at it.  Not certain why it can't be done using this
> > method.
> > 
> > Hope this helps.
> > 
> > On Tue, Apr 26, 2016 at 07:22:20PM -0400, dayanidhi sreenivasan wrote:
> >> Hi Guys,
> >> Can somebody tell me why there is no support for non blocking IO for bpf yet?
> >> 
> >> static  int
> >> bpfioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags,
> >>    struct thread *td)
> >> {
> >> 
> >> ......
> >> 
> >> case FIONBIO:       /* Non-blocking I/O */
> >>        break;
> >> 
> >> }
> >> 
> >> Thanks
> >> Daya
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-- 
John Baldwin