Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757176Ab2J2PLF (ORCPT ); Mon, 29 Oct 2012 11:11:05 -0400 Received: from merlin.infradead.org ([205.233.59.134]:34812 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752268Ab2J2PJj (ORCPT ); Mon, 29 Oct 2012 11:09:39 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Feng Tang , Andi Kleen , Ingo Molnar , Namhyung Kim , Peter Zijlstra , Arnaldo Carvalho de Melo Subject: [PATCH 12/14] perf header: Add is_perf_magic() func Date: Mon, 29 Oct 2012 13:09:11 -0200 Message-Id: <1351523353-27982-13-git-send-email-acme@infradead.org> X-Mailer: git-send-email 1.7.9.2.358.g22243 In-Reply-To: <1351523353-27982-1-git-send-email-acme@infradead.org> References: <1351523353-27982-1-git-send-email-acme@infradead.org> Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2030 Lines: 62 From: Feng Tang 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 Cc: Andi Kleen Cc: Ingo Molnar Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1351569369-26732-7-git-send-email-feng.tang@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/header.c | 10 ++++++++++ tools/perf/util/header.h | 1 + 2 files changed, 11 insertions(+) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 514ed1b..195a47a 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -2341,6 +2341,16 @@ 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 879d215..5f1cd68 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 -- 1.7.9.2.358.g22243 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/