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libbpf: Add ring_buffer__ring

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Add a new function ring_buffer__ring, which exposes struct ring * to the
user, representing a single ringbuffer.

Signed-off-by: Martin Kelly <martin.kelly@crowdstrike.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230925215045.2375758-4-martin.kelly@crowdstrike.com
This commit is contained in:
Martin Kelly
2023-09-25 14:50:34 -07:00
committed by Andrii Nakryiko
parent bfa471bc85
commit a20576f5f2
3 changed files with 24 additions and 0 deletions
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8
src/ringbuf.c
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@@ -330,6 +330,14 @@ int ring_buffer__epoll_fd(const struct ring_buffer *rb)
return rb->epoll_fd;
}
struct ring *ring_buffer__ring(struct ring_buffer *rb, unsigned int idx)
{
if (idx >= rb->ring_cnt)
return errno = ERANGE, NULL;
return rb->rings[idx];
}
static void user_ringbuf_unmap_ring(struct user_ring_buffer *rb)
{
if (rb->consumer_pos) {