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libbpf: Introduce bpf_map__initial_value().

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Introduce bpf_map__initial_value() to read initial contents
of mmaped data/rodata/bss maps.
Note that bpf_map__set_initial_value() doesn't allow modifying
kconfig map while bpf_map__initial_value() allows reading
its values.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210514003623.28033-17-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov
2021-05-13 17:36:18 -07:00
committed by Andrii Nakryiko
parent 594960b3db
commit b44566c71b
3 changed files with 10 additions and 0 deletions
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8
src/libbpf.c
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@@ -9758,6 +9758,14 @@ int bpf_map__set_initial_value(struct bpf_map *map,
return 0;
}
const void *bpf_map__initial_value(struct bpf_map *map, size_t *psize)
{
if (!map->mmaped)
return NULL;
*psize = map->def.value_size;
return map->mmaped;
}
bool bpf_map__is_offload_neutral(const struct bpf_map *map)
{
return map->def.type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;