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[67.170.153.23]) by mx.google.com with ESMTPSA id ym10sm11765258pac.10.2015.03.02.13.11.03 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 02 Mar 2015 13:11:04 -0800 (PST) From: John Stultz To: Linux Kernel Mailing List Cc: John Stultz , Shuah Khan , Prarit Bhargava , Thomas Gleixner , Richard Cochran Subject: [PATCH 18/19] selftests/timers: Add set-2038 test from timetest suite Date: Mon, 2 Mar 2015 13:10:11 -0800 Message-Id: <1425330612-24280-19-git-send-email-john.stultz@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1425330612-24280-1-git-send-email-john.stultz@linaro.org> References: <1425330612-24280-1-git-send-email-john.stultz@linaro.org> X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: john.stultz@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.215.48 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org List-ID: X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , Adds the set-2038 test which sets the time to near-edge cases like the start and end of the 32 bit epoch and checks that time behaves properly. There is also a dangerous mode, which lets the clock roll over past 2038 on 32bit systems, which on some older kernels will cause system hangs. Cc: Shuah Khan Cc: Prarit Bhargava Cc: Thomas Gleixner Cc: Richard Cochran Signed-off-by: John Stultz --- tools/testing/selftests/timers/Makefile | 3 +- tools/testing/selftests/timers/set-2038.c | 147 ++++++++++++++++++++++++++++++ 2 files changed, 149 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/timers/set-2038.c diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile index 7e2fba7..9da3498 100644 --- a/tools/testing/selftests/timers/Makefile +++ b/tools/testing/selftests/timers/Makefile @@ -5,7 +5,7 @@ LDFLAGS += -lrt -lpthread bins = posix_timers nanosleep inconsistency-check nsleep-lat raw_skew \ set-timer-lat threadtest mqueue-lat valid-adjtimex \ alarmtimer-suspend change_skew skew_consistency clocksource-switch \ - leap-a-day leapcrash set-tai + leap-a-day leapcrash set-tai set-2038 all: ${bins} @@ -33,6 +33,7 @@ run_destructive_tests: run_tests ./leap-a-day -s -i 10 ./leapcrash ./set-tai + ./set-2038 clean: rm -f ${bins} diff --git a/tools/testing/selftests/timers/set-2038.c b/tools/testing/selftests/timers/set-2038.c new file mode 100644 index 0000000..0f23923 --- /dev/null +++ b/tools/testing/selftests/timers/set-2038.c @@ -0,0 +1,147 @@ +/* Time bounds setting test + * by: john stultz (johnstul@us.ibm.com) + * (C) Copyright IBM 2012 + * Licensed under the GPLv2 + * + * NOTE: This is a meta-test which sets the time to edge cases then + * uses other tests to detect problems. Thus this test requires that + * the inconsistency-check and nanosleep tests be present in the same + * directory it is run from. + * + * To build: + * $ gcc set-2038.c -o set-2038 -lrt + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + */ + +#include +#include +#include +#include +#include +#ifdef KTEST +#include "../kselftest.h" +#else +static inline int ksft_exit_pass(void) +{ + exit(0); +} +static inline int ksft_exit_fail(void) +{ + exit(1); +} +#endif + +extern char *optarg; + +#define NSEC_PER_SEC 1000000000LL + +#define KTIME_MAX ((long long)~((unsigned long long)1 << 63)) +#define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) + +#define YEAR_1901 (-0x7fffffffL) +#define YEAR_1970 1 +#define YEAR_2038 0x7fffffffL /*overflows 32bit time_t */ +#define YEAR_2262 KTIME_SEC_MAX /*overflows 64bit ktime_t */ +#define YEAR_MAX ((long long)((1ULL<<63)-1)) /*overflows 64bit time_t */ + +int is32bits(void) +{ + return (sizeof(long) == 4); +} + +int settime(long long time) +{ + struct timeval now; + int ret; + + now.tv_sec = (time_t)time; + now.tv_usec = 0; + + ret = settimeofday(&now, NULL); + + printf("Setting time to 0x%lx: %d\n", (long)time, ret); + return ret; +} + +int do_tests(void) +{ + int ret; + + ret = system("date"); + ret = system("./inconsistency-check -c 0 -t 20"); + ret |= system("./nanosleep"); + ret |= system("./nsleep-lat"); + return ret; + +} + +int main(int argc, char *argv[]) +{ + int ret = 0; + int opt, dangerous = 0; + time_t start; + + /* Process arguments */ + while ((opt = getopt(argc, argv, "d")) != -1) { + switch (opt) { + case 'd': + dangerous = 1; + } + } + + start = time(0); + + /* First test that crazy values don't work */ + if (!settime(YEAR_1901)) { + ret = -1; + goto out; + } + if (!settime(YEAR_MAX)) { + ret = -1; + goto out; + } + if (!is32bits() && !settime(YEAR_2262)) { + ret = -1; + goto out; + } + + /* Now test behavior near edges */ + settime(YEAR_1970); + ret = do_tests(); + if (ret) + goto out; + + settime(YEAR_2038 - 600); + ret = do_tests(); + if (ret) + goto out; + + /* The rest of the tests can blowup on 32bit systems */ + if (is32bits() && !dangerous) + goto out; + /* Test rollover behavior 32bit edge */ + settime(YEAR_2038 - 10); + ret = do_tests(); + if (ret) + goto out; + + settime(YEAR_2262 - 600); + ret = do_tests(); + +out: + /* restore clock */ + settime(start); + if (ret) + return ksft_exit_fail(); + return ksft_exit_pass(); +} +