On Tue, Nov 16, 2021 at 8:42 AM Mauricio Vásquez <mauricio@xxxxxxxxxx> wrote:
>
> Implement helper function to save the contents of a BTF object to a
> file.
>
> Signed-off-by: Mauricio Vásquez <mauricio@xxxxxxxxxx>
> Signed-off-by: Rafael David Tinoco <rafael.tinoco@xxxxxxxxxxx>
> Signed-off-by: Lorenzo Fontana <lorenzo.fontana@xxxxxxxxxx>
> Signed-off-by: Leonardo Di Donato <leonardo.didonato@xxxxxxxxxx>
> ---
> tools/lib/bpf/btf.c | 30 ++++++++++++++++++++++++++++++
> tools/lib/bpf/btf.h | 2 ++
> tools/lib/bpf/libbpf.map | 1 +
> 3 files changed, 33 insertions(+)
>
> diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
> index fadf089ae8fe..96a242f91832 100644
> --- a/tools/lib/bpf/btf.c
> +++ b/tools/lib/bpf/btf.c
> @@ -1121,6 +1121,36 @@ struct btf *btf__parse_split(const char *path, struct btf *base_btf)
> return libbpf_ptr(btf_parse(path, base_btf, NULL));
> }
>
> +int btf__save_raw(const struct btf *btf, const char *path)
> +{
> + const void *data;
> + FILE *f = NULL;
> + __u32 data_sz;
> + int err = 0;
> +
> + data = btf__raw_data(btf, &data_sz);
> + if (!data) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + f = fopen(path, "wb");
> + if (!f) {
> + err = -errno;
> + goto out;
> + }
> +
> + if (fwrite(data, 1, data_sz, f) != data_sz) {
> + err = -errno;
> + goto out;
> + }
> +
> +out:
> + if (f)
> + fclose(f);
> + return libbpf_err(err);
> +}
> +
> static void *btf_get_raw_data(const struct btf *btf, __u32 *size, bool swap_endian);
>
> int btf__load_into_kernel(struct btf *btf)
> diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
> index 5c73a5b0a044..4f8d3f303aa6 100644
> --- a/tools/lib/bpf/btf.h
> +++ b/tools/lib/bpf/btf.h
> @@ -114,6 +114,8 @@ LIBBPF_API struct btf *btf__parse_elf_split(const char *path, struct btf *base_b
> LIBBPF_API struct btf *btf__parse_raw(const char *path);
> LIBBPF_API struct btf *btf__parse_raw_split(const char *path, struct btf *base_btf);
>
> +LIBBPF_API int btf__save_raw(const struct btf *btf, const char *path);
> +
> LIBBPF_API struct btf *btf__load_vmlinux_btf(void);
> LIBBPF_API struct btf *btf__load_module_btf(const char *module_name, struct btf *vmlinux_btf);
> LIBBPF_API struct btf *libbpf_find_kernel_btf(void);
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index 6a59514a48cf..c9555f8655af 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -414,4 +414,5 @@ LIBBPF_0.6.0 {
> perf_buffer__new_deprecated;
> perf_buffer__new_raw;
> perf_buffer__new_raw_deprecated;
> + btf__save_raw;
this is a sorted list, please keep it so
> } LIBBPF_0.5.0;
> --
> 2.25.1
>
