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>
---
tools/lib/bpf/btf.c | 22 ++++++++++++++++++++++
tools/lib/bpf/btf.h | 2 ++
tools/lib/bpf/libbpf.map | 1 +
3 files changed, 25 insertions(+)
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 0c628c33e23b..087035574dba 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -4773,3 +4773,25 @@ int btf_ext_visit_str_offs(struct btf_ext *btf_ext, str_off_visit_fn visit, void
return 0;
}
+
+int btf__save_to_file(struct btf *btf, const char *path)
+{
+ const void *data;
+ __u32 data_sz;
+ FILE *file;
+
+ data = btf_get_raw_data(btf, &data_sz, btf->swapped_endian);
+ if (!data)
+ return -ENOMEM;
+
+ file = fopen(path, "wb");
+ if (!file)
+ return -errno;
+
+ if (fwrite(data, 1, data_sz, file) != data_sz) {
+ fclose(file);
+ return -EIO;
+ }
+
+ return fclose(file);
+}
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index bc005ba3ceec..300ad498c615 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_to_file(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 15239c05659c..0e9bed7c9b9e 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -399,4 +399,5 @@ LIBBPF_0.6.0 {
btf__add_decl_tag;
btf__raw_data;
btf__type_cnt;
+ btf__save_to_file;
} LIBBPF_0.5.0;
--
2.25.1
