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| author | Martin Kelly <martin.kelly@crowdstrike.com> | 2023-09-25 14:50:44 -0700 |
|---|---|---|
| committer | Andrii Nakryiko <andrii.nakryiko@gmail.com> | 2023-10-02 11:17:48 -0700 |
| commit | b520bcd7d83ad00a054de4c02011f197edc341e8 (patch) | |
| tree | 4bef30584bff47b080d19de16451b63daa211ca9 | |
| parent | 6413c2d0639663ec3a974aeeba10e27ca611058f (diff) | |
| download | libbpf-b520bcd7d83ad00a054de4c02011f197edc341e8.tar.gz | |
libbpf: Add ring__consume
Add ring__consume to consume a single ringbuffer, analogous to
ring_buffer__consume.
Signed-off-by: Martin Kelly <martin.kelly@crowdstrike.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230925215045.2375758-14-martin.kelly@crowdstrike.com
| -rw-r--r-- | src/libbpf.h | 10 | ||||
| -rw-r--r-- | src/libbpf.map | 1 | ||||
| -rw-r--r-- | src/ringbuf.c | 11 |
3 files changed, 22 insertions, 0 deletions
diff --git a/src/libbpf.h b/src/libbpf.h index 114e306..4753784 100644 --- a/src/libbpf.h +++ b/src/libbpf.h @@ -1312,6 +1312,16 @@ LIBBPF_API size_t ring__size(const struct ring *r); */ LIBBPF_API int ring__map_fd(const struct ring *r); +/** + * @brief **ring__consume()** consumes available ringbuffer data without event + * polling. + * + * @param r A ringbuffer object. + * @return The number of records consumed (or INT_MAX, whichever is less), or + * a negative number if any of the callbacks return an error. + */ +LIBBPF_API int ring__consume(struct ring *r); + struct user_ring_buffer_opts { size_t sz; /* size of this struct, for forward/backward compatibility */ }; diff --git a/src/libbpf.map b/src/libbpf.map index 1b42253..cc973b6 100644 --- a/src/libbpf.map +++ b/src/libbpf.map @@ -401,6 +401,7 @@ LIBBPF_1.3.0 { bpf_program__attach_tcx; bpf_program__attach_uprobe_multi; ring__avail_data_size; + ring__consume; ring__consumer_pos; ring__map_fd; ring__producer_pos; diff --git a/src/ringbuf.c b/src/ringbuf.c index 8aec202..aacb642 100644 --- a/src/ringbuf.c +++ b/src/ringbuf.c @@ -371,6 +371,17 @@ int ring__map_fd(const struct ring *r) return r->map_fd; } +int ring__consume(struct ring *r) +{ + int64_t res; + + res = ringbuf_process_ring(r); + if (res < 0) + return libbpf_err(res); + + return res > INT_MAX ? INT_MAX : res; +} + static void user_ringbuf_unmap_ring(struct user_ring_buffer *rb) { if (rb->consumer_pos) { |