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libbpf: Add ring__map_fd

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Add ring__map_fd to get the file descriptor underlying a given
ringbuffer.

Signed-off-by: Martin Kelly <martin.kelly@crowdstrike.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230925215045.2375758-12-martin.kelly@crowdstrike.com
This commit is contained in:
Martin Kelly
2023-09-25 14:50:42 -07:00
committed by Andrii Nakryiko
parent cd3fe56c75
commit 6413c2d063
3 changed files with 15 additions and 0 deletions
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9
src/libbpf.h
View File

@@ -1303,6 +1303,15 @@ LIBBPF_API size_t ring__avail_data_size(const struct ring *r);
*/ */
LIBBPF_API size_t ring__size(const struct ring *r); LIBBPF_API size_t ring__size(const struct ring *r);
/**
* @brief **ring__map_fd()** returns the file descriptor underlying the given
* ringbuffer.
*
* @param r A ringbuffer object.
* @return The underlying ringbuffer file descriptor
*/
LIBBPF_API int ring__map_fd(const struct ring *r);
struct user_ring_buffer_opts { struct user_ring_buffer_opts {
size_t sz; /* size of this struct, for forward/backward compatibility */ size_t sz; /* size of this struct, for forward/backward compatibility */
}; };

1
src/libbpf.map
View File

@@ -402,6 +402,7 @@ LIBBPF_1.3.0 {
bpf_program__attach_uprobe_multi; bpf_program__attach_uprobe_multi;
ring__avail_data_size; ring__avail_data_size;
ring__consumer_pos; ring__consumer_pos;
ring__map_fd;
ring__producer_pos; ring__producer_pos;
ring__size; ring__size;
ring_buffer__ring; ring_buffer__ring;

5
src/ringbuf.c
View File

@@ -366,6 +366,11 @@ size_t ring__size(const struct ring *r)
return r->mask + 1; return r->mask + 1;
} }
int ring__map_fd(const struct ring *r)
{
return r->map_fd;
}
static void user_ringbuf_unmap_ring(struct user_ring_buffer *rb) static void user_ringbuf_unmap_ring(struct user_ring_buffer *rb)
{ {
if (rb->consumer_pos) { if (rb->consumer_pos) {