netdev - [PATCH bpf-next v2 1/4] libbpf: Implement btf__save

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Date:   Tue, 16 Nov 2021 11:42:05 -0500
From:   Mauricio Vásquez <mauricio@...volk.io>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Rafael David Tinoco <rafaeldtinoco@...il.com>,
        Lorenzo Fontana <lorenzo.fontana@...stic.co>,
        Leonardo Di Donato <leonardo.didonato@...stic.co>
Subject: [PATCH bpf-next v2 1/4] libbpf: Implement btf__save_raw()

Implement helper function to save the contents of a BTF object to a
file.

Signed-off-by: Mauricio Vásquez <mauricio@...volk.io>
Signed-off-by: Rafael David Tinoco <rafael.tinoco@...asec.com>
Signed-off-by: Lorenzo Fontana <lorenzo.fontana@...stic.co>
Signed-off-by: Leonardo Di Donato <leonardo.didonato@...stic.co>
---
 tools/lib/bpf/btf.c      | 30 ++++++++++++++++++++++++++++++
 tools/lib/bpf/btf.h      |  2 ++
 tools/lib/bpf/libbpf.map |  1 +
 3 files changed, 33 insertions(+)

diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index fadf089ae8fe..96a242f91832 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -1121,6 +1121,36 @@ struct btf *btf__parse_split(const char *path, struct btf *base_btf)
 	return libbpf_ptr(btf_parse(path, base_btf, NULL));
 }
 
+int btf__save_raw(const struct btf *btf, const char *path)
+{
+	const void *data;
+	FILE *f = NULL;
+	__u32 data_sz;
+	int err = 0;
+
+	data = btf__raw_data(btf, &data_sz);
+	if (!data) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	f = fopen(path, "wb");
+	if (!f) {
+		err = -errno;
+		goto out;
+	}
+
+	if (fwrite(data, 1, data_sz, f) != data_sz) {
+		err = -errno;
+		goto out;
+	}
+
+out:
+	if (f)
+		fclose(f);
+	return libbpf_err(err);
+}
+
 static void *btf_get_raw_data(const struct btf *btf, __u32 *size, bool swap_endian);
 
 int btf__load_into_kernel(struct btf *btf)
diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h
index 5c73a5b0a044..4f8d3f303aa6 100644
--- a/tools/lib/bpf/btf.h
+++ b/tools/lib/bpf/btf.h
@@ -114,6 +114,8 @@ LIBBPF_API struct btf *btf__parse_elf_split(const char *path, struct btf *base_b
 LIBBPF_API struct btf *btf__parse_raw(const char *path);
 LIBBPF_API struct btf *btf__parse_raw_split(const char *path, struct btf *base_btf);
 
+LIBBPF_API int btf__save_raw(const struct btf *btf, const char *path);
+
 LIBBPF_API struct btf *btf__load_vmlinux_btf(void);
 LIBBPF_API struct btf *btf__load_module_btf(const char *module_name, struct btf *vmlinux_btf);
 LIBBPF_API struct btf *libbpf_find_kernel_btf(void);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 6a59514a48cf..c9555f8655af 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -414,4 +414,5 @@ LIBBPF_0.6.0 {
 		perf_buffer__new_deprecated;
 		perf_buffer__new_raw;
 		perf_buffer__new_raw_deprecated;
+		btf__save_raw;
 } LIBBPF_0.5.0;
-- 
2.25.1