Network device driver. Blocking send does not work.

Hello,

I've developed a Linux Network device driver.
For now, this driver only provides PF_PACKET protocol family socket.

The problem is that, even when in blocking mode, if there are no more space
available the "send" function returns -1 with error code ENOBUFS.

I don't think the problem comes from the test application as this very
simple application works fine on "eth0" network device.

I should have missed something.

Do you have any idea?

Regards.

Vincent