From patchwork Mon Jan 25 12:01:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Majewski X-Patchwork-Id: 41811 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id B28373950C59; Mon, 25 Jan 2021 12:02:15 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-out.m-online.net (mail-out.m-online.net [212.18.0.9]) by sourceware.org (Postfix) with ESMTPS id AD4D53857800 for ; Mon, 25 Jan 2021 12:02:12 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org AD4D53857800 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=denx.de Authentication-Results: sourceware.org; spf=none smtp.mailfrom=lukma@denx.de Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 4DPT4f1LJ9z1qw94; Mon, 25 Jan 2021 13:02:10 +0100 (CET) Received: from localhost (dynscan1.mnet-online.de [192.168.6.70]) by mail.m-online.net (Postfix) with ESMTP id 4DPT4d6wVNz1rFcv; Mon, 25 Jan 2021 13:02:09 +0100 (CET) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.70]) (amavisd-new, port 10024) with ESMTP id eipODRjoU0fN; Mon, 25 Jan 2021 13:02:08 +0100 (CET) X-Auth-Info: seJUhsP3BQiZ7GyJb7EGYesdjUIf36KOj5St5G1QaOw= Received: from localhost.localdomain (89-64-25-12.dynamic.chello.pl [89.64.25.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPSA; Mon, 25 Jan 2021 13:02:07 +0100 (CET) From: Lukasz Majewski To: Joseph Myers , Adhemerval Zanella , Florian Weimer Subject: [PATCH] tst: Provide test for difftime Date: Mon, 25 Jan 2021 13:01:55 +0100 Message-Id: <20210125120155.17966-1-lukma@denx.de> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-Spam-Status: No, score=-7.9 required=5.0 tests=BAYES_00, GIT_PATCH_0, KAM_DMARC_STATUS, KAM_LAZY_DOMAIN_SECURITY, KAM_SHORT, RCVD_IN_ABUSEAT, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, RCVD_IN_SBL_CSS, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: GNU C Library , Florian Weimer , Alistair Francis Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" This change adds new test to assess difftime's functionality by adding some arbitrary offsets to current time_t value (read via time). If 64 bit time_t is supported, the same procedure is applied around the threshold of Y2038 time overflow. --- time/Makefile | 2 +- time/tst-difftime.c | 57 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+), 1 deletion(-) create mode 100644 time/tst-difftime.c diff --git a/time/Makefile b/time/Makefile index 486fb02ecb..7de2ce0196 100644 --- a/time/Makefile +++ b/time/Makefile @@ -51,7 +51,7 @@ tests := test_time clocktest tst-posixtz tst-strptime tst_wcsftime \ tst-clock tst-clock2 tst-clock_nanosleep tst-cpuclock1 \ tst-adjtime tst-clock-y2038 tst-clock2-y2038 \ tst-cpuclock1-y2038 tst-clock_nanosleep-y2038 tst-clock_settime \ - tst-clock_adjtime tst-ctime + tst-clock_adjtime tst-ctime tst-difftime include ../Rules diff --git a/time/tst-difftime.c b/time/tst-difftime.c new file mode 100644 index 0000000000..eb3024c949 --- /dev/null +++ b/time/tst-difftime.c @@ -0,0 +1,57 @@ +/* Test for difftime + Copyright (C) 2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include + +static void test_difftime_helper (time_t start, time_t t1, + time_t t0, double exp_val) +{ + time_t time1, time0; + + time1 = time0 = start; + time1 += t1; + time0 += t0; + + double sub = difftime (time1, time0); + if (sub != exp_val) + FAIL_EXIT1 ("*** Difftime returned %f (expected %f)\n", sub, exp_val); +} + +static int +do_test (void) +{ + /* Check if difftime works with current time. */ + test_difftime_helper (time (NULL), +1800, -1800, 3600.0); + test_difftime_helper (time (NULL), -1800, +1800, -3600.0); + + /* Check if difftime works correctly near 32 bit time_t overflow. */ + if (sizeof (time_t) > 4) + { + test_difftime_helper (0x7FFFFFFF, +1800, -1800, 3600.0); + test_difftime_helper (0x80000000, +1800, -1800, 3600.0); + test_difftime_helper (0x80000000, -1800, +1800, -3600.0); + test_difftime_helper (0x7FFFFFFF, -1800, +1800, -3600.0); + } + else + FAIL_UNSUPPORTED ("32-bit time_t"); + + return 0; +} + +#include