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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,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 A1598C07E96 for ; Wed, 7 Jul 2021 03:11:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 61BF661CC0 for ; Wed, 7 Jul 2021 03:11:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230061AbhGGDNw (ORCPT ); Tue, 6 Jul 2021 23:13:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:52344 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229992AbhGGDNw (ORCPT ); Tue, 6 Jul 2021 23:13:52 -0400 Received: from gandalf.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (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 C1CA561CBB; Wed, 7 Jul 2021 03:11:12 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.94.2) (envelope-from ) id 1m0xxv-00130X-KG; Tue, 06 Jul 2021 23:11:11 -0400 From: Steven Rostedt To: linux-trace-devel@vger.kernel.org Cc: "Steven Rostedt (VMware)" Subject: [PATCH 1/4] libtracefs: Implement tracefs_list_size() Date: Tue, 6 Jul 2021 23:11:07 -0400 Message-Id: <20210707031110.249759-2-rostedt@goodmis.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210707031110.249759-1-rostedt@goodmis.org> References: <20210707031110.249759-1-rostedt@goodmis.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org From: "Steven Rostedt (VMware)" Add tracefs_list_size() that returns a the size of a list created by tracefs_list_add(). Signed-off-by: Steven Rostedt (VMware) --- include/tracefs.h | 1 + src/tracefs-utils.c | 16 ++++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/include/tracefs.h b/include/tracefs.h index 266c513e4116..6b9a76c4c40a 100644 --- a/include/tracefs.h +++ b/include/tracefs.h @@ -65,6 +65,7 @@ int tracefs_error_clear(struct tracefs_instance *instance); void tracefs_list_free(char **list); char **tracefs_list_add(char **list, const char *string); +int tracefs_list_size(char **list); /** * tracefs_trace_on_get_fd - Get a file descriptor of "tracing_on" in given instance diff --git a/src/tracefs-utils.c b/src/tracefs-utils.c index ec5ecb08ed2e..6750336c9ef6 100644 --- a/src/tracefs-utils.c +++ b/src/tracefs-utils.c @@ -447,3 +447,19 @@ char **tracefs_list_add(char **list, const char *string) return list; } + +/** + * tracefs_list_size - Return the number of strings in the list + * @list: The list to determine the size. + * + * Returns the number of elements in the list. + * If @list is NULL, then zero is returned. + */ +int tracefs_list_size(char **list) +{ + if (!list) + return 0; + + list--; + return (int)*(unsigned long *)list; +} -- 2.30.2