From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757271Ab2I1IjN (ORCPT ); Fri, 28 Sep 2012 04:39:13 -0400 Received: from mga14.intel.com ([143.182.124.37]:13515 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756777Ab2I1IhN (ORCPT ); Fri, 28 Sep 2012 04:37:13 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.80,501,1344236400"; d="scan'208";a="150188636" 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 v4 6/8] perf header: Add is_perf_magic() func Date: Fri, 28 Sep 2012 16:30:38 +0800 Message-Id: <1348821040-9724-7-git-send-email-feng.tang@intel.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1348821040-9724-1-git-send-email-feng.tang@intel.com> References: <1348821040-9724-1-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 function, other modules can basically check whether a file is a legal perf data file by checking its first 8 bytes against all possible perf magic numbers. Change the function name from check_perf_magic to more meaningful is_perf_magic as suggested by acme. Signed-off-by: Feng Tang --- tools/perf/util/header.c | 10 ++++++++++ tools/perf/util/header.h | 1 + 2 files changed, 11 insertions(+), 0 deletions(-) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 7daad23..87e679e 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -2340,6 +2340,16 @@ static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph) return -1; } +bool is_perf_magic(u64 magic) +{ + if (!memcmp(&magic, __perf_magic1, sizeof(magic)) + || magic == __perf_magic2 + || magic == __perf_magic2_sw) + return true; + + return false; +} + 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 99bdd3a..0af8c38 100644 --- a/tools/perf/util/header.h +++ b/tools/perf/util/header.h @@ -154,6 +154,7 @@ 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); +bool is_perf_magic(u64 magic); /* * arch specific callback -- 1.7.1