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libbpf: Introduce bpf_prog_get_fd_by_id_opts()

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Introduce bpf_prog_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_prog_get_fd_by_id(), and call bpf_prog_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_prog_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/20221006110736.84253-4-roberto.sassu@huaweicloud.com
This commit is contained in:
Roberto Sassu
2022-10-06 13:07:33 +02:00
committed by Andrii Nakryiko
parent a719cae6aa
commit d6d1ec5b25
3 changed files with 14 additions and 1 deletions
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2
src/bpf.h
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@@ -374,6 +374,8 @@ struct bpf_get_fd_by_id_opts {
#define bpf_get_fd_by_id_opts__last_field open_flags
LIBBPF_API int bpf_prog_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_prog_get_fd_by_id_opts(__u32 id,
const struct bpf_get_fd_by_id_opts *opts);
LIBBPF_API int bpf_map_get_fd_by_id(__u32 id);
LIBBPF_API int bpf_map_get_fd_by_id_opts(__u32 id,
const struct bpf_get_fd_by_id_opts *opts);