linux-kernel - [RFC PATCH v3 26/37] bpf tools: Introduce accessors for struct bpf

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Message-ID: <1431860222-61636-27-git-send-email-wangnan0@huawei.com>
Date:	Sun, 17 May 2015 10:56:51 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<paulus@...ba.org>, <a.p.zijlstra@...llo.nl>, <mingo@...hat.com>,
	<acme@...nel.org>, <namhyung@...nel.org>, <jolsa@...nel.org>,
	<dsahern@...il.com>, <ast@...mgrid.com>, <daniel@...earbox.net>,
	<brendan.d.gregg@...il.com>, <masami.hiramatsu.pt@...achi.com>
CC:	<lizefan@...wei.com>, <linux-kernel@...r.kernel.org>,
	<pi3orama@....com>
Subject: [RFC PATCH v3 26/37] 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 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

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