selftests/timers: Add set-tai from the timetest suite

This patch adds the set-tai test which ensures the tai offset
can be set properly from adjtimex.

Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Tested-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
index d733324..7e2fba7 100644 (file)
--- 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
+       leap-a-day leapcrash set-tai
 
 all: ${bins}
 
@@ -32,6 +32,7 @@ run_destructive_tests: run_tests
        ./clocksource-switch
        ./leap-a-day -s -i 10
        ./leapcrash
+       ./set-tai
 
 clean:
        rm -f ${bins}

diff --git a/tools/testing/selftests/timers/set-tai.c b/tools/testing/selftests/timers/set-tai.c
new file mode 100644 (file)
index 0000000..dc88dbc
--- /dev/null
+++ b/tools/testing/selftests/timers/set-tai.c
@@ -0,0 +1,79 @@
+/* Set tai offset
+ *              by: John Stultz <john.stultz@linaro.org>
+ *              (C) Copyright Linaro 2013
+ *              Licensed under the GPLv2
+ *
+ *   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 <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <sys/time.h>
+#include <sys/timex.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#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
+
+int set_tai(int offset)
+{
+       struct timex tx;
+
+       memset(&tx, 0, sizeof(tx));
+
+       tx.modes = ADJ_TAI;
+       tx.constant = offset;
+
+       return adjtimex(&tx);
+}
+
+int get_tai(void)
+{
+       struct timex tx;
+
+       memset(&tx, 0, sizeof(tx));
+
+       adjtimex(&tx);
+       return tx.tai;
+}
+
+int main(int argc, char **argv)
+{
+       int i, ret;
+
+       ret = get_tai();
+       printf("tai offset started at %i\n", ret);
+
+       printf("Checking tai offsets can be properly set: ");
+       for (i = 1; i <= 60; i++) {
+               ret = set_tai(i);
+               ret = get_tai();
+               if (ret != i) {
+                       printf("[FAILED] expected: %i got %i\n", i, ret);
+                       return ksft_exit_fail();
+               }
+       }
+       printf("[OK]\n");
+       return ksft_exit_pass();
+}