[PATCH] libbpf: Add bpf_object__set_name(obj, name) api.

[Yucong Sun <fallentree@xxxxxx>]

From: fallentree <fallentree@xxxxxx>

Tracking: libbpf/libbpf#291

Signed-off-by: Yucong Sun <fallentree@xxxxxx>
---
 tools/lib/bpf/libbpf.c                                 | 10 ++++++++++
 tools/lib/bpf/libbpf.h                                 |  1 +
 tools/lib/bpf/libbpf.map                               |  1 +
 .../selftests/bpf/prog_tests/reference_tracking.c      |  7 +++++++
 4 files changed, 19 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index a1ca6fb0c6d8..654fa638743f 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -7545,6 +7545,16 @@ const char *bpf_object__name(const struct bpf_object *obj)
 	return obj ? obj->name : libbpf_err_ptr(-EINVAL);
 }
 
+int bpf_object__set_name(struct bpf_object *obj, const char* name)
+{
+	if (!name)
+		return libbpf_err(-EINVAL);
+
+	strncpy(obj->name, name, sizeof(obj->name) - 1);
+
+	return 0;
+}
+
 unsigned int bpf_object__kversion(const struct bpf_object *obj)
 {
 	return obj ? obj->kern_version : 0;
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 1271d99bb7aa..7d28c7c600d4 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -161,6 +161,7 @@ LIBBPF_API int bpf_object__load_xattr(struct bpf_object_load_attr *attr);
 LIBBPF_API int bpf_object__unload(struct bpf_object *obj);
 
 LIBBPF_API const char *bpf_object__name(const struct bpf_object *obj);
+LIBBPF_API int bpf_object__set_name(struct bpf_object *obj, const char* name);
 LIBBPF_API unsigned int bpf_object__kversion(const struct bpf_object *obj);
 LIBBPF_API int bpf_object__set_kversion(struct bpf_object *obj, __u32 kern_version);
 
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index c240d488eb5e..3c15aefeb6e0 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -377,4 +377,5 @@ LIBBPF_0.5.0 {
 		bpf_object__gen_loader;
 		btf_dump__dump_type_data;
 		libbpf_set_strict_mode;
+		bpf_object__set_name;
 } LIBBPF_0.4.0;
diff --git a/tools/testing/selftests/bpf/prog_tests/reference_tracking.c b/tools/testing/selftests/bpf/prog_tests/reference_tracking.c
index de2688166696..4d3d0a4aec03 100644
--- a/tools/testing/selftests/bpf/prog_tests/reference_tracking.c
+++ b/tools/testing/selftests/bpf/prog_tests/reference_tracking.c
@@ -5,6 +5,7 @@ void test_reference_tracking(void)
 {
 	const char *file = "test_sk_lookup_kern.o";
 	const char *obj_name = "ref_track";
+	const char *obj_name2 = "ref_track2";
 	DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts,
 		.object_name = obj_name,
 		.relaxed_maps = true,
@@ -23,6 +24,12 @@ void test_reference_tracking(void)
 		  bpf_object__name(obj), obj_name))
 		goto cleanup;
 
+	bpf_object__set_name(obj, obj_name2);
+	if (CHECK(strcmp(bpf_object__name(obj), obj_name2), "obj_name",
+		  "wrong obj name '%s', expected '%s'\n",
+		  bpf_object__name(obj), obj_name2))
+		goto cleanup;
+
 	bpf_object__for_each_program(prog, obj) {
 		const char *title;
 
-- 
2.30.2