linux-kernel - [RFC PATCH v5 21/30] bpf tools: Introduce accessors for struct bpf

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Message-ID: <1433144296-74992-22-git-send-email-wangnan0@huawei.com>
Date:	Mon, 1 Jun 2015 07:38:07 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<namhyung@...nel.org>, <alexei.starovoitov@...il.com>,
	<masami.hiramatsu.pt@...achi.com>, <acme@...nel.org>,
	<paulus@...ba.org>, <a.p.zijlstra@...llo.nl>, <mingo@...hat.com>,
	<jolsa@...nel.org>, <dsahern@...il.com>, <daniel@...earbox.net>,
	<brendan.d.gregg@...il.com>
CC:	<lizefan@...wei.com>, <hekuang@...wei.com>, <xiakaixu@...wei.com>,
	<linux-kernel@...r.kernel.org>, <pi3orama@....com>
Subject: [RFC PATCH v5 21/30] bpf tools: Introduce accessors for struct bpf_object

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

Signed-off-by: Wang Nan <wangnan0@...wei.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 ed1b1fd..8ff6b05 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -880,6 +880,15 @@ void bpf_object__close(struct bpf_object *obj)
 	free(obj);
 }
 
+int bpf_object__get_prog_cnt(struct bpf_object *obj, size_t *pcnt)
+{
+	if (!obj || !pcnt)
+		return -EINVAL;
+
+	*pcnt = obj->nr_programs;
+	return 0;
+}
+
 struct bpf_program *
 bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
 {
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 3f2b734..6b144f9 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -33,6 +33,9 @@ void bpf_object__close(struct bpf_object *object);
 int bpf_object__load(struct bpf_object *obj);
 int bpf_object__unload(struct bpf_object *obj);
 
+/* Accessors of bpf_object */
+int bpf_object__get_prog_cnt(struct bpf_object *obj, size_t *pcnt);
+
 /* Accessors of bpf_program. */
 struct bpf_program;
 struct bpf_program *bpf_program__next(struct bpf_program *prog,
-- 
1.8.3.4

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