linux-kernel - [PATCH 11/15] tools/nolibc: add difftime()

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Message-Id: <20250423-nolibc-misc-v1-11-a925bf40297b@linutronix.de>
Date: Wed, 23 Apr 2025 17:01:41 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Willy Tarreau <w@....eu>, 
 Thomas Weißschuh <linux@...ssschuh.net>, 
 Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 11/15] tools/nolibc: add difftime()

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

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 tools/include/nolibc/time.h                  | 7 +++++++
 tools/testing/selftests/nolibc/nolibc-test.c | 1 +
 2 files changed, 8 insertions(+)

diff --git a/tools/include/nolibc/time.h b/tools/include/nolibc/time.h
index 28a1549adb14e2087fa8fbdb7e9c35e1c3f22c2a..760133c574ece97165e3bba5616a387deaf07aff 100644
--- a/tools/include/nolibc/time.h
+++ b/tools/include/nolibc/time.h
@@ -105,6 +105,13 @@ int clock_settime(clockid_t clockid, struct timespec *tp)
 }
 
 
+static __inline__
+double difftime(time_t time1, time_t time2)
+{
+	return time1 - time2;
+}
+
+
 static __attribute__((unused))
 time_t time(time_t *tptr)
 {
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index aed71de4b4f3dd1f183c7fc25e5a5cee466600ed..fd8bab42e75157967658690005bc9142360fc135 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -1423,6 +1423,7 @@ int run_stdlib(int min, int max)
 		CASE_TEST(toupper_noop);            EXPECT_EQ(1, toupper('A'), 'A'); break;
 		CASE_TEST(abs);                     EXPECT_EQ(1, abs(-10), 10); break;
 		CASE_TEST(abs_noop);                EXPECT_EQ(1, abs(10), 10); break;
+		CASE_TEST(difftime);                EXPECT_EQ(1, difftime(200., 100.), 100.); break;
 
 		case __LINE__:
 			return ret; /* must be last */

-- 
2.49.0