* [PATCH] tst: Add test for clock_adjtime
@ 2021-01-20 13:41 Lukasz Majewski
0 siblings, 0 replies; only message in thread
From: Lukasz Majewski @ 2021-01-20 13:41 UTC (permalink / raw)
To: Joseph Myers, Adhemerval Zanella, Florian Weimer
Cc: Paul Eggert, Alistair Francis, Arnd Bergmann, Alistair Francis,
GNU C Library, Carlos O'Donell, Florian Weimer,
Zack Weinberg, Lukasz Majewski
This code brings test to check if time on target machine is properly
adjusted.
The time is altered only when cross-test-ssh.sh is executed with
--allow-time-setting flag
As the delta added to CLOCK_REALTIME is only 1ms the original time is
not restored and further tests are executed with this bias.
---
time/Makefile | 3 +-
time/tst-clock_adjtime.c | 61 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 63 insertions(+), 1 deletion(-)
create mode 100644 time/tst-clock_adjtime.c
diff --git a/time/Makefile b/time/Makefile
index e469cacb4a..43e5821adc 100644
--- a/time/Makefile
+++ b/time/Makefile
@@ -50,7 +50,8 @@ tests := test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
tst-tzname tst-y2039 bug-mktime4 tst-strftime2 tst-strftime3 \
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-cpuclock1-y2038 tst-clock_nanosleep-y2038 tst-clock_settime \
+ tst-clock_adjtime
include ../Rules
diff --git a/time/tst-clock_adjtime.c b/time/tst-clock_adjtime.c
new file mode 100644
index 0000000000..ece68acc5f
--- /dev/null
+++ b/time/tst-clock_adjtime.c
@@ -0,0 +1,61 @@
+/* Test for clock_adjtime
+ 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
+ <https://www.gnu.org/licenses/>. */
+
+#include <time.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <sys/timex.h>
+#include <support/check.h>
+#include <support/xtime.h>
+
+static int
+do_test (void)
+{
+ struct timespec tv_then, tv_now;
+ struct timex delta;
+
+ /* Check if altering target time is allowed. */
+ if (getenv (SETTIME_ENV_NAME) == NULL)
+ FAIL_UNSUPPORTED ("clock_adjtime is executed only when "\
+ SETTIME_ENV_NAME" is set\n");
+
+ tv_then = xclock_now (CLOCK_REALTIME);
+
+ /* Setup time value to adjust - 1 ms. */
+ delta.time.tv_sec = 0;
+ delta.time.tv_usec = 1000;
+ delta.modes = ADJ_SETOFFSET;
+
+ int ret = clock_adjtime (CLOCK_REALTIME, &delta);
+ if (ret == -1)
+ FAIL_EXIT1 ("*** clock_adjtime failed: %m\n");
+
+ tv_now = xclock_now (CLOCK_REALTIME);
+
+ /* Check difference between timerfd_gettime calls. */
+ long long int diff = tv_now.tv_sec - tv_then.tv_sec;
+ diff *= 1000000000;
+ diff += tv_now.tv_nsec - tv_then.tv_nsec;
+ /* The adjustment cannot be large than 10 ms. */
+ if (diff > 10000000)
+ FAIL_EXIT1 ("clock_adjtime set wrong time!\n");
+
+ return 0;
+}
+
+#include <support/test-driver.c>
--
2.20.1
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