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libbpf: Expose libbpf ring_buffer epoll_fd

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This provides a convenient perf ringbuf -> libbpf ringbuf migration
path for users of external polling systems. It is analogous to
perf_buffer__epoll_fd.

Signed-off-by: Brendan Jackman <jackmanb@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20201214113812.305274-1-jackmanb@google.com
This commit is contained in:
Brendan Jackman
2020-12-14 11:38:12 +00:00
committed by Andrii Nakryiko
parent ebcae62e7e
commit 30e2c16571
3 changed files with 8 additions and 0 deletions
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6
src/ringbuf.c
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@@ -282,3 +282,9 @@ int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms)
}
return cnt < 0 ? -errno : res;
}
/* Get an fd that can be used to sleep until data is available in the ring(s) */
int ring_buffer__epoll_fd(const struct ring_buffer *rb)
{
return rb->epoll_fd;
}