Commit 96408c43447a ("tools/bpf: implement libbpf btf__get_map_kv_tids() API
function")
added the API function btf__get_map_kv_tids():
btf__get_map_kv_tids(const struct btf *btf, char *map_name, ...)
The parameter map_name has type "char *". This is okay inside libbpf library
since
the map_name is from bpf_map->name which also has type "char *".
This will be problematic if the caller for map_name already has attribute
"const",
e.g., from C++ string.c_str(). It will result in either a warning or an error.
/home/yhs/work/bcc/src/cc/btf.cc:166:51:
error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]
return btf__get_map_kv_tids(btf_, map_name.c_str()
This patch added "const" attributes to map_name parameter.
Fixes: 96408c43447a ("tools/bpf: implement libbpf btf__get_map_kv_tids() API
function")
Signed-off-by: Yonghong Song <y...@fb.com>
---
tools/lib/bpf/btf.c | 2 +-
tools/lib/bpf/btf.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 4949f8840bda..3b3a2959d03a 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -511,7 +511,7 @@ int btf__get_from_id(__u32 id, struct btf **btf)
return err;
}
-int btf__get_map_kv_tids(const struct btf *btf, char *map_name,
+int btf__get_map_kv_tids(const struct btf *btf, const char *map_name,
__u32 expected_key_size, __u32 expected_value_size,
__u32 *key_type_id, __u32 *value_type_id)
{
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index 25a9d2db035d..b393da90cc85 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -69,7 +69,7 @@ LIBBPF_API void btf__get_strings(const struct btf *btf, const
char **strings,
__u32 *str_len);
LIBBPF_API const char *btf__name_by_offset(const struct btf *btf, __u32
offset);
LIBBPF_API int btf__get_from_id(__u32 id, struct btf **btf);
-LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, char *map_name,
+LIBBPF_API int btf__get_map_kv_tids(const struct btf *btf, const char
*map_name,
__u32 expected_key_size,
__u32 expected_value_size,
__u32 *key_type_id, __u32 *value_type_id);
--
2.17.1
