[RFC PATCH v3 26/37] bpf tools: Introduce accessors for struct bpf_object

Wang Nan
2015-05-17T10:58:48Z

This patch add an accessor which allows caller to get count of programs
in an object file.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
---
tools/lib/bpf/libbpf.c | 9 +++++++++
tools/lib/bpf/libbpf.h | 3 +++
2 files changed, 12 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index d770adc..89c725a 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -964,6 +964,15 @@ void bpf_close_object(struct bpf_object *obj)
free(obj);
}

+int bpf_obj_get_prog_cnt(struct bpf_object *obj, size_t *pcnt)
+{
+ if (!obj || !pcnt)
+ return -EINVAL;
+
+ *pcnt = obj->nr_programs;
+ return 0;
+}
+
static inline struct bpf_program *
handler_to_prog(struct bpf_prog_handler *handler)
{
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index b451d1a..31ff5d9 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -26,6 +26,9 @@ void bpf_close_object(struct bpf_object *object);
int bpf_load_object(struct bpf_object *obj);
int bpf_unload_object(struct bpf_object *obj);

+/* Accessors of bpf_object */
+int bpf_obj_get_prog_cnt(struct bpf_object *obj, size_t *pcnt);
+
/* Accessors of bpf_program. */
struct bpf_prog_handler;
struct bpf_prog_handler *bpf_next_prog(struct bpf_object *obj,
--
1.8.3.4