Commit ae769390 authored by Martin Kelly's avatar Martin Kelly Committed by Andrii Nakryiko
Browse files

libbpf: Add ring__map_fd 



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

Signed-off-by: default avatarMartin Kelly <martin.kelly@crowdstrike.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230925215045.2375758-12-martin.kelly@crowdstrike.com
parent bb32dd2c

tools/lib/bpf/libbpf.h

+9 −0
Original line number Diff line number Diff line
@@ -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);



/**

 * @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 {

	size_t sz; /* size of this struct, for forward/backward compatibility */

};

tools/lib/bpf/libbpf.map

+1 −0
Original line number Diff line number Diff line
@@ -402,6 +402,7 @@ LIBBPF_1.3.0 { 
		bpf_program__attach_uprobe_multi;

		ring__avail_data_size;

		ring__consumer_pos;

		ring__map_fd;

		ring__producer_pos;

		ring__size;

		ring_buffer__ring;

tools/lib/bpf/ringbuf.c

+5 −0
Original line number Diff line number Diff line
@@ -366,6 +366,11 @@ size_t ring__size(const struct ring *r) 
	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)

{

	if (rb->consumer_pos) {