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 X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CE33AC43381 for ; Mon, 25 Feb 2019 21:22:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 98FA521874 for ; Mon, 25 Feb 2019 21:22:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551129756; bh=XWRFlyclP+EIQNJndaWZ9CyfOewG6ivy6wprh5SuLK0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0gH6yd2N6pcxqpX/m7f/v8s0MljyosrXaLDMzubThj639ew69Hp56IemlKeGIAghe Ebx43ILycWqal5dV/eYkus7jOxcUR9zWrawvRZ8N/f2rN0DN65jPvLQKC4xToIyrtX 4hogxdPjgeQCtGIyf88RJoamKX0T/TB/hAuj+ejI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730910AbfBYVWf (ORCPT ); Mon, 25 Feb 2019 16:22:35 -0500 Received: from mail.kernel.org ([198.145.29.99]:56704 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729604AbfBYVWb (ORCPT ); Mon, 25 Feb 2019 16:22:31 -0500 Received: from quaco.ghostprotocols.net (179-240-165-120.3g.claro.net.br [179.240.165.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8068A21852; Mon, 25 Feb 2019 21:22:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1551129750; bh=XWRFlyclP+EIQNJndaWZ9CyfOewG6ivy6wprh5SuLK0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xoxCsOMtnVQrPuc+/FSE/gL68PkLQn8ZoRw/8kZVfAqopzotVIhiVp6fN7AHKiIEH gxXoHpWCxYbuo8wrUFKNI+NxVD2Gh5phBTY2EZTTXaC/fc+msl57V3iEYhj7HrwSTv xeN9Rjt6J18qp+d50hYOASBKfQTnhd/Ox4wn4Z0g= From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: Jiri Olsa , Namhyung Kim , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Andi Kleen , Stephane Eranian , Arnaldo Carvalho de Melo Subject: [PATCH 27/37] perf tools: Add perf_exe() helper to find perf binary Date: Mon, 25 Feb 2019 18:20:25 -0300 Message-Id: <20190225212035.24781-28-acme@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190225212035.24781-1-acme@kernel.org> References: <20190225212035.24781-1-acme@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andi Kleen Also convert one existing user. Signed-off-by: Andi Kleen Acked-by: Jiri Olsa Cc: Namhyung Kim Cc: Stephane Eranian Link: http://lkml.kernel.org/r/20190224153722.27020-9-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/header.c | 12 +++--------- tools/perf/util/util.c | 10 ++++++++++ tools/perf/util/util.h | 2 ++ 3 files changed, 15 insertions(+), 9 deletions(-) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index a2323d777dae..01b324c275b9 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -527,17 +527,11 @@ static int write_event_desc(struct feat_fd *ff, static int write_cmdline(struct feat_fd *ff, struct perf_evlist *evlist __maybe_unused) { - char buf[MAXPATHLEN]; - u32 n; - int i, ret; + char pbuf[MAXPATHLEN], *buf; + int i, ret, n; /* actual path to perf binary */ - ret = readlink("/proc/self/exe", buf, sizeof(buf) - 1); - if (ret <= 0) - return -1; - - /* readlink() does not add null termination */ - buf[ret] = '\0'; + buf = perf_exe(pbuf, MAXPATHLEN); /* account for binary path */ n = perf_env.nr_cmdline + 1; diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index 706818693086..d388f80d8703 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -568,3 +568,13 @@ const char *perf_tip(const char *dirpath) return tip; } + +char *perf_exe(char *buf, int len) +{ + int n = readlink("/proc/self/exe", buf, len); + if (n > 0) { + buf[n] = 0; + return buf; + } + return strcpy(buf, "perf"); +} diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h index 01c538027c6f..09c1b0f91f65 100644 --- a/tools/perf/util/util.h +++ b/tools/perf/util/util.h @@ -77,6 +77,8 @@ extern bool perf_singlethreaded; void perf_set_singlethreaded(void); void perf_set_multithreaded(void); +char *perf_exe(char *buf, int len); + #ifndef O_CLOEXEC #ifdef __sparc__ #define O_CLOEXEC 0x400000 -- 2.20.1