netdev - [PATCH bpf-next v4 4/8] bpftool: Implement btf_save

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Message-Id: <20220112142709.102423-5-mauricio@kinvolk.io>
Date:   Wed, 12 Jan 2022 09:27:05 -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>,
        Quentin Monnet <quentin@...valent.com>,
        Rafael David Tinoco <rafaeldtinoco@...il.com>,
        Lorenzo Fontana <lorenzo.fontana@...stic.co>,
        Leonardo Di Donato <leonardo.didonato@...stic.co>
Subject: [PATCH bpf-next v4 4/8] bpftool: Implement btf_save_raw()

Helper function to save 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/bpf/bpftool/gen.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c
index cdeb1047d79d..5a74fb68dc84 100644
--- a/tools/bpf/bpftool/gen.c
+++ b/tools/bpf/bpftool/gen.c
@@ -1096,6 +1096,36 @@ static int do_help(int argc, char **argv)
 	return 0;
 }
 
+static 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 err;
+}
+
 /* Create BTF file for a set of BPF objects */
 static int btfgen(const char *src_btf, const char *dst_btf, const char *objspaths[])
 {
-- 
2.25.1