From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756588Ab2IXPbu (ORCPT ); Mon, 24 Sep 2012 11:31:50 -0400 Received: from mga03.intel.com ([143.182.124.21]:56118 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756393Ab2IXPal (ORCPT ); Mon, 24 Sep 2012 11:30:41 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.80,476,1344236400"; d="scan'208";a="196413243" From: Feng Tang To: acme@redhat.com Cc: mingo@elte.hu, a.p.zijlstra@chello.nl, andi@firstfloor.org, namhyung@kernel.org, dsahern@gmail.com, linux-kernel@vger.kernel.org, Feng Tang Subject: [PATCH v3 7/9] perf header: Add check_perf_magic() func Date: Mon, 24 Sep 2012 23:24:09 +0800 Message-Id: <1348500251-9937-8-git-send-email-feng.tang@intel.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1348500251-9937-1-git-send-email-feng.tang@intel.com> References: <1348500251-9937-1-git-send-email-feng.tang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With this func, other modules can basically check whether a file is a legal perf data file by checking its first 8 bytes aginst all possible perf magic nunbers. Signed-off-by: Feng Tang --- tools/perf/util/header.c | 11 +++++++++++ tools/perf/util/header.h | 1 + 2 files changed, 12 insertions(+), 0 deletions(-) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index ad72b28..555cb68 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -2174,6 +2174,17 @@ static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph) return -1; } +/* Return 0 if matched */ +int check_perf_magic(u64 magic) +{ + if (!memcmp(&magic, __perf_magic1, sizeof(magic)) + || magic == __perf_magic2 + || magic == __perf_magic2_sw) + return 0; + + return -1; +} + static int check_magic_endian(u64 magic, uint64_t hdr_sz, bool is_pipe, struct perf_header *ph) { diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h index 58de08b..af1a51c 100644 --- a/tools/perf/util/header.h +++ b/tools/perf/util/header.h @@ -131,6 +131,7 @@ int perf_event__synthesize_build_id(struct perf_tool *tool, int perf_event__process_build_id(struct perf_tool *tool, union perf_event *event, struct perf_session *session); +int check_perf_magic(u64 magic); /* * arch specific callback -- 1.7.1