From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8F25C433F5 for ; Tue, 16 Nov 2021 16:42:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9226861549 for ; Tue, 16 Nov 2021 16:42:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235391AbhKPQpX (ORCPT ); Tue, 16 Nov 2021 11:45:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234638AbhKPQpX (ORCPT ); Tue, 16 Nov 2021 11:45:23 -0500 Received: from mail-qk1-x72c.google.com (mail-qk1-x72c.google.com [IPv6:2607:f8b0:4864:20::72c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B747C061570 for ; Tue, 16 Nov 2021 08:42:26 -0800 (PST) Received: by mail-qk1-x72c.google.com with SMTP id p4so12786931qkm.7 for ; Tue, 16 Nov 2021 08:42:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kinvolk.io; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=Sxz4D6uLOmqsmbyo2QO6wq5cXgoWWcc31npQo/Aiwtg=; b=jAq2hNFk8MaTn0aZHXzRrlb5ocwWptvh72PyzwxQqZZWMX+eqaGYZJouQSROdnUKWb yOHAJquGCUM3FX+hZDuMp2adj2tuW+jM75i7TeSYxFrUkbBFte9wfINyyQCuppRVfDeT JqkkGe63hepnhLlC0nKqzmCAqbv/jsYPevv0c= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Sxz4D6uLOmqsmbyo2QO6wq5cXgoWWcc31npQo/Aiwtg=; b=p7/ms6m20MXFYH7R52/5hlQdMC4mMJntmwm0p5JfdlplJ9iBZViR4dbzngi6ALwV54 PdzoIB6Me+DORL8oZUk7sf/08xMSg7N+Lb1AvuPwO0fDTzGAzQzAO8TfZRc8cty6HuPo 9i6mhfYxYEjpP8VHQhUNERvYiEpzoyU5dxD6MvhLlcz6JwUaYvgyno2W5UzegtTtzbN2 DTJA6yDIyB+EZ7o6s/sjzAK7ioEC33OnNKuD/9gCqJMyHfdNR2npwgMQxHViUa2m0U73 CuEUs5bEDLkNXYeue0YH/vDeNbQsO0UdXo1wg1EUnvI5ixTOxREmtNdICNbV8fuwAHJt dF5w== X-Gm-Message-State: AOAM530BlgdPJZVRxOS+HcPZ+Y4XfZ0XVQ94a1F2q9UR2Y5Zg6Om+BTh ogNhFWf+mOvMQv/RrvIcUTcMIQ== X-Google-Smtp-Source: ABdhPJxQdlx5k20QPqy421Fx3yQW6Vxvr/3v+SmCGcLsjvKUmXKqbYIygSIn15UJkuVfQl7khR8o1A== X-Received: by 2002:ae9:e30b:: with SMTP id v11mr7513837qkf.329.1637080945413; Tue, 16 Nov 2021 08:42:25 -0800 (PST) Received: from localhost.localdomain ([191.91.82.96]) by smtp.gmail.com with ESMTPSA id bk18sm7309121qkb.35.2021.11.16.08.42.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Nov 2021 08:42:25 -0800 (PST) From: =?UTF-8?q?Mauricio=20V=C3=A1squez?= To: netdev@vger.kernel.org, bpf@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Rafael David Tinoco , Lorenzo Fontana , Leonardo Di Donato Subject: [PATCH bpf-next v2 1/4] libbpf: Implement btf__save_raw() Date: Tue, 16 Nov 2021 11:42:05 -0500 Message-Id: <20211116164208.164245-2-mauricio@kinvolk.io> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211116164208.164245-1-mauricio@kinvolk.io> References: <20211116164208.164245-1-mauricio@kinvolk.io> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Implement helper function to save the contents of a BTF object to a file. Signed-off-by: Mauricio Vásquez Signed-off-by: Rafael David Tinoco Signed-off-by: Lorenzo Fontana Signed-off-by: Leonardo Di Donato --- 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