From patchwork Tue Mar 23 01:28:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Rostedt X-Patchwork-Id: 12156565 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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 71E2CC433E0 for ; Tue, 23 Mar 2021 01:33:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4D070619A1 for ; Tue, 23 Mar 2021 01:33:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231285AbhCWBdF (ORCPT ); Mon, 22 Mar 2021 21:33:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:44484 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231569AbhCWBcb (ORCPT ); Mon, 22 Mar 2021 21:32:31 -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 6335A619A8; Tue, 23 Mar 2021 01:32:26 +0000 (UTC) Received: from rostedt by gandalf.local.home with local (Exim 4.94) (envelope-from ) id 1lOVuD-001cOm-Df; Mon, 22 Mar 2021 21:32:25 -0400 Message-ID: <20210323013225.303716095@goodmis.org> User-Agent: quilt/0.66 Date: Mon, 22 Mar 2021 21:28:00 -0400 From: Steven Rostedt To: linux-trace-devel@vger.kernel.org Cc: Sameeruddin shaik Subject: [PATCH 5/7] libtracefs: Add write_filter() helper function References: <20210323012755.155237800@goodmis.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org From: "Steven Rostedt (VMware)" Wrap the writing of the filter into the filter file in a helper function such that it can be used in more places. Signed-off-by: Steven Rostedt (VMware) --- src/tracefs-tools.c | 58 ++++++++++++++++++++++++++++++--------------- 1 file changed, 39 insertions(+), 19 deletions(-) diff --git a/src/tracefs-tools.c b/src/tracefs-tools.c index d75cb3adcb9f..5b12127a61d9 100644 --- a/src/tracefs-tools.c +++ b/src/tracefs-tools.c @@ -461,6 +461,33 @@ static bool match(const char *str, struct func_filter *func_filter) return regexec(&func_filter->re, str, 0, NULL, 0) == 0; } +/* + * Return 0 on success, -1 error writing, 1 on other errors. + */ +static int write_filter(int fd, const char *filter, const char *module) +{ + char *each_str = NULL; + int write_size; + int size; + + if (module) + write_size = asprintf(&each_str, "%s:mod:%s ", filter, module); + else + write_size = asprintf(&each_str, "%s ", filter); + + if (write_size < 0) + return 1; + + size = write(fd, each_str, write_size); + free(each_str); + + /* compare written bytes*/ + if (size < write_size) + return -1; + + return 0; +} + static int check_available_filters(struct func_filter *func_filters, const char *module, const char ***errs) { @@ -526,31 +553,24 @@ static int check_available_filters(struct func_filter *func_filters, static int controlled_write(int fd, const char **filters, const char *module, const char ***errs) { - char *each_str = NULL; - int write_size = 0; - int size = 0; int ret = 0; int i; for (i = 0; filters[i]; i++) { - if (module) - write_size = asprintf(&each_str, "%s:mod:%s ", filters[i], module); - else - write_size = asprintf(&each_str, "%s ", filters[i]); - if (write_size < 0) { - ret = 1; - goto error; - } - size = write(fd, each_str, write_size); - /* compare written bytes*/ - if (size < write_size) + int r; + + r = write_filter(fd, filters[i], module); + if (r < 0) { add_errors(errs, filters[i], ret--); - free(each_str); - each_str = NULL; + } else if (r > 0) { + /* Not filter error */ + if (errs) { + free(*errs); + *errs = NULL; + } + return 1; + } } - error: - if (each_str) - free(each_str); return ret; }