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Subject[PATCHv4 23/28] selftest/timens: Add a test for clock_nanosleep()
Date
From: Andrei Vagin <avagin@gmail.com>

Check that clock_nanosleep() takes into account clock offsets.

Signed-off-by: Andrei Vagin <avagin@gmail.com>
Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
tools/testing/selftests/timens/.gitignore | 1 +
tools/testing/selftests/timens/Makefile | 2 +-
.../selftests/timens/clock_nanosleep.c | 100 ++++++++++++++++++
3 files changed, 102 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/timens/clock_nanosleep.c

diff --git a/tools/testing/selftests/timens/.gitignore b/tools/testing/selftests/timens/.gitignore
index b609f6ee9fb9..9b6c8ddac2c8 100644
--- a/tools/testing/selftests/timens/.gitignore
+++ b/tools/testing/selftests/timens/.gitignore
@@ -1,2 +1,3 @@
+clock_nanosleep
timens
timerfd
diff --git a/tools/testing/selftests/timens/Makefile b/tools/testing/selftests/timens/Makefile
index 66b90cd28e5c..76a1dc891184 100644
--- a/tools/testing/selftests/timens/Makefile
+++ b/tools/testing/selftests/timens/Makefile
@@ -1,4 +1,4 @@
-TEST_GEN_PROGS := timens timerfd
+TEST_GEN_PROGS := timens timerfd clock_nanosleep

CFLAGS := -Wall -Werror

diff --git a/tools/testing/selftests/timens/clock_nanosleep.c b/tools/testing/selftests/timens/clock_nanosleep.c
new file mode 100644
index 000000000000..dfd4e3429c75
--- /dev/null
+++ b/tools/testing/selftests/timens/clock_nanosleep.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <sched.h>
+
+#include <sys/timerfd.h>
+#include <sys/syscall.h>
+#include <time.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+
+#include "log.h"
+#include "timens.h"
+
+static long long get_elapsed_time(int clockid, struct timespec *start)
+{
+ struct timespec curr;
+ long long secs, nsecs;
+
+ if (clock_gettime(clockid, &curr) == -1)
+ return pr_perror("clock_gettime");
+
+ secs = curr.tv_sec - start->tv_sec;
+ nsecs = curr.tv_nsec - start->tv_nsec;
+ if (nsecs < 0) {
+ secs--;
+ nsecs += 1000000000;
+ }
+ if (nsecs > 1000000000) {
+ secs++;
+ nsecs -= 1000000000;
+ }
+ return secs * 1000 + nsecs / 1000000;
+}
+
+int run_test(int clockid)
+{
+ long long elapsed;
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ struct timespec now = {};
+ struct timespec start;
+
+ if (clock_gettime(clockid, &start) == -1)
+ return pr_perror("clock_gettime");
+
+
+ if (i == 1) {
+ now.tv_sec = start.tv_sec;
+ now.tv_nsec = start.tv_nsec;
+ }
+
+ now.tv_sec += 2;
+ clock_nanosleep(clockid, i ? TIMER_ABSTIME : 0, &now, NULL);
+
+ elapsed = get_elapsed_time(clockid, &start);
+ if (elapsed < 1900 || elapsed > 2100) {
+ pr_fail("clockid: %d abs: %d elapsed: %lld\n",
+ clockid, i, elapsed);
+ return 1;
+ }
+ ksft_test_result_pass("clockid: %d abs:%d\n", clockid, i);
+ }
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ int ret, nsfd;
+
+ nscheck();
+
+ if (unshare(CLONE_NEWTIME))
+ return pr_perror("unshare");
+
+ if (_settime(CLOCK_MONOTONIC, 7 * 24 * 3600))
+ return 1;
+ if (_settime(CLOCK_BOOTTIME, 9 * 24 * 3600))
+ return 1;
+
+ nsfd = open("/proc/self/ns/time_for_children", O_RDONLY);
+ if (nsfd < 0)
+ return pr_perror("Unable to open timens_for_children");
+
+ if (setns(nsfd, CLONE_NEWTIME))
+ return pr_perror("Unable to set timens");
+
+ ret = 0;
+ ret |= run_test(CLOCK_MONOTONIC);
+ ret |= run_test(CLOCK_BOOTTIME_ALARM);
+
+ if (ret)
+ ksft_exit_fail();
+ ksft_exit_pass();
+ return ret;
+}
+
--
2.22.0
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