From 17964083d3a5ea7a853deea3e48b154da87cbf3c Mon Sep 17 00:00:00 2001
From: Chris Friedt <cfriedt@tenstorrent.com>
Date: Sat, 17 May 2025 21:30:27 -0400
Subject: [PATCH] libc: common: time: use sys_clock api rather than posix

Remove POSIX clock_gettime() from the common libc time implementation,
since POSIX should not be a dependency for ISO C.

Instead, use the newly added lib/os sys_clock API.

Specifically, sys_clock_gettime().

Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
---
 lib/libc/common/source/time/time.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/libc/common/source/time/time.c b/lib/libc/common/source/time/time.c
index 85840fa8cd9..5eccd733d97 100644
--- a/lib/libc/common/source/time/time.c
+++ b/lib/libc/common/source/time/time.c
@@ -1,22 +1,23 @@
 /*
  * Copyright (c) 2021 Golioth, Inc.
+ * Copyright (c) 2025 Tenstorrent AI ULC
  *
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <errno.h>
 #include <time.h>
 
-/* clock_gettime() prototype */
-#include <zephyr/posix/time.h>
+#include <zephyr/sys/clock.h>
 
 time_t time(time_t *tloc)
 {
 	struct timespec ts;
 	int ret;
 
-	ret = clock_gettime(CLOCK_REALTIME, &ts);
+	ret = sys_clock_gettime(SYS_CLOCK_REALTIME, &ts);
 	if (ret < 0) {
-		/* errno is already set by clock_gettime */
+		errno = -ret;
 		return (time_t) -1;
 	}