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libbpf: Introduce bpf_link_get_fd_by_id_opts()

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Introduce bpf_link_get_fd_by_id_opts(), for symmetry with
bpf_map_get_fd_by_id_opts(), to let the caller pass the newly introduced
data structure bpf_get_fd_by_id_opts. Keep the existing
bpf_link_get_fd_by_id(), and call bpf_link_get_fd_by_id_opts() with NULL as
opts argument, to prevent setting open_flags.

Currently, the kernel does not support non-zero open_flags for
bpf_link_get_fd_by_id_opts(), and a call with them will result in an error
returned by the bpf() system call. The caller should always pass zero
open_flags.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20221006110736.84253-6-roberto.sassu@huaweicloud.com
This commit is contained in:
Roberto Sassu
2022-10-06 13:07:35 +02:00
committed by Andrii Nakryiko
parent 998282f179
commit 0d6c47523c
3 changed files with 14 additions and 1 deletions
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src/libbpf.map
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@@ -372,6 +372,7 @@ LIBBPF_1.0.0 {
LIBBPF_1.1.0 {
global:
bpf_btf_get_fd_by_id_opts;
bpf_link_get_fd_by_id_opts;
bpf_map_get_fd_by_id_opts;
bpf_prog_get_fd_by_id_opts;
user_ring_buffer__discard;