tools/nolibc: add timer functions

This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-9-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

1 files changed, 51 insertions, 0 deletions

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 9b8aa41a547b..7530b442941f 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -905,6 +905,56 @@ int test_stat_timestamps(void)
 	return 0;
 }
 
+int test_timer(void)
+{
+	struct itimerspec timerspec;
+	struct sigevent evp;
+	timer_t timer;
+	int ret;
+
+	evp.sigev_notify = SIGEV_NONE;
+
+	ret = timer_create(CLOCK_MONOTONIC, &evp, &timer);
+	if (ret)
+		return ret;
+
+	timerspec = (struct itimerspec) {
+		.it_value.tv_sec = 1000000,
+	};
+	ret = timer_settime(timer, 0, &timerspec, NULL);
+	if (ret)
+		goto err;
+
+	timerspec = (struct itimerspec) {
+		.it_value.tv_sec = -1,
+		.it_value.tv_nsec = -1,
+		.it_interval.tv_sec = -1,
+		.it_interval.tv_nsec = -1,
+	};
+	ret = timer_gettime(timer, &timerspec);
+	if (ret)
+		goto err;
+
+	errno = EINVAL;
+	ret = -1;
+
+	if (timerspec.it_interval.tv_sec || timerspec.it_interval.tv_nsec)
+		goto err;
+
+	if (timerspec.it_value.tv_sec > 1000000)
+		goto err;
+
+	ret = timer_delete(timer);
+	if (ret)
+		return ret;
+
+	return 0;
+
+err:
+	timer_delete(timer);
+	return ret;
+}
+
 int test_uname(void)
 {
 	struct utsname buf;
@@ -1186,6 +1236,7 @@ int run_syscall(int min, int max)
 		CASE_TEST(stat_fault);        EXPECT_SYSER(1, stat(NULL, &stat_buf), -1, EFAULT); break;
 		CASE_TEST(stat_timestamps);   EXPECT_SYSZR(1, test_stat_timestamps()); break;
 		CASE_TEST(symlink_root);      EXPECT_SYSER(1, symlink("/", "/"), -1, EEXIST); break;
+		CASE_TEST(timer);             EXPECT_SYSZR(1, test_timer()); break;
 		CASE_TEST(uname);             EXPECT_SYSZR(proc, test_uname()); break;
 		CASE_TEST(uname_fault);       EXPECT_SYSER(1, uname(NULL), -1, EFAULT); break;
 		CASE_TEST(unlink_root);       EXPECT_SYSER(1, unlink("/"), -1, EISDIR); break;