Libbpf userspace function bpf_map__get_next_key

0.8.0

allows to iterate BPF map keys by fetching next key that follows current key.

Definition

int bpf_map__get_next_key(const struct bpf_map *map, const void *cur_key, void *next_key, size_t key_sz);

Parameters

• map: BPF map to fetch next key from
• cur_key: pointer to memory containing bytes of current key or NULL to fetch the first key
• next_key: pointer to memory to write next key into
• key_sz: size in bytes of key data, needs to match BPF map definition's key_size

Return

0, on success; -ENOENT if cur_key is the last key in BPF map; negative error, otherwise

Usage

bpf_map__get_next_key() is high-level equivalent of bpf_map_get_next_key() API with added check for key size.

Example

Docs could be improved

This part of the docs is incomplete, contributions are very welcome