linux-kernel - [RFC PATCH v3 08/37] bpf tools: Define basic interface

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Date:	Sun, 17 May 2015 10:56:33 +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 08/37] bpf tools: Define basic interface

bpf_open_object() and bpf_close_object() are open and close function of
eBPF object files. 'struct bpf_object' will be handler of one object
file. Its internal structure is hide to user.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
---
 tools/lib/bpf/libbpf.c | 11 +++++++++++
 tools/lib/bpf/libbpf.h |  8 ++++++++
 2 files changed, 19 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index d7a7869..f8decff 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -12,6 +12,7 @@
 #include <stdarg.h>
 #include <string.h>
 #include <unistd.h>
+#include <errno.h>
 #include <asm/unistd.h>
 #include <linux/bpf.h>
 
@@ -56,3 +57,13 @@ void libbpf_set_print(int (*warn)(const char *format, ...),
 	__pr_info = info;
 	__pr_debug = debug;
 }
+
+struct bpf_object *bpf_open_object(const char *path)
+{
+	return NULL;
+}
+
+void bpf_close_object(struct bpf_object *object)
+{
+	return 0;
+}
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index eb306c0..e523ae9 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -9,8 +9,16 @@
 #ifndef __BPF_LIBBPF_H
 #define __BPF_LIBBPF_H
 
+#include <stdio.h>
+
 void libbpf_set_print(int (*warn)(const char *format, ...),
 		      int (*info)(const char *format, ...),
 		      int (*debug)(const char *format, ...));
 
+/* Hide internal to user */
+struct bpf_object;
+
+struct bpf_object *bpf_open_object(const char *path);
+void bpf_close_object(struct bpf_object *object);
+
 #endif
-- 
1.8.3.4

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