Function bpf_canfreebuf

freebsd/net/bpf.c:430–441

* If the buffer mechanism has a way to decide that a held buffer can be made * free, then it is exposed via the bpf_canfreebuf() interface. (1) is * returned if the buffer can be discarded, (0) is returned if it cannot. */

 * returned if the buffer can be discarded, (0) is returned if it cannot.
 */
static int
bpf_canfreebuf(struct bpf_d *d)
{

	BPFD_LOCK_ASSERT(d);

	switch (d->bd_bufmode) {
	case BPF_BUFMODE_ZBUF:
		return (bpf_zerocopy_canfreebuf(d));
	}
	return (0);
}

/*
 * Allow the buffer model to indicate that the current store buffer is