From 064c6ef830f7e904545f13e5297e056597530ab1 Mon Sep 17 00:00:00 2001
From: Marcin Niestroj <m.niestroj@emb.dev>
Date: Mon, 15 Mar 2021 23:16:42 +0100
Subject: [PATCH] libc: minimal: implement time() API

Implement time() API by using clock_gettime(CLOCK_REALTIME, ...).

Signed-off-by: Marcin Niestroj <m.niestroj@emb.dev>
---
 lib/libc/minimal/CMakeLists.txt               |  2 ++
 lib/libc/minimal/include/time.h               |  2 ++
 lib/libc/minimal/source/time/time.c           | 28 +++++++++++++++++++
 .../net/civetweb/common/src/libc_extensions.c |  5 ----
 4 files changed, 32 insertions(+), 5 deletions(-)
 create mode 100644 lib/libc/minimal/source/time/time.c

diff --git a/lib/libc/minimal/CMakeLists.txt b/lib/libc/minimal/CMakeLists.txt
index 2c7afb115b2..b8f9475ef96 100644
--- a/lib/libc/minimal/CMakeLists.txt
+++ b/lib/libc/minimal/CMakeLists.txt
@@ -20,3 +20,5 @@ zephyr_library_sources(
   source/stdout/fprintf.c
   source/time/gmtime.c
 )
+
+zephyr_library_sources_ifdef(CONFIG_POSIX_CLOCK source/time/time.c)
diff --git a/lib/libc/minimal/include/time.h b/lib/libc/minimal/include/time.h
index 2de85621d16..946f1a83a53 100644
--- a/lib/libc/minimal/include/time.h
+++ b/lib/libc/minimal/include/time.h
@@ -52,6 +52,8 @@ struct tm *gmtime(const time_t *timep);
 struct tm *gmtime_r(const time_t *_MLIBC_RESTRICT timep,
 		    struct tm *_MLIBC_RESTRICT result);
 
+time_t time(time_t *tloc);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/libc/minimal/source/time/time.c b/lib/libc/minimal/source/time/time.c
new file mode 100644
index 00000000000..dbb21a3cec2
--- /dev/null
+++ b/lib/libc/minimal/source/time/time.c
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2021 Golioth, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <time.h>
+
+/* clock_gettime() prototype */
+#include <posix/time.h>
+
+time_t time(time_t *tloc)
+{
+	struct timespec ts;
+	int ret;
+
+	ret = clock_gettime(CLOCK_REALTIME, &ts);
+	if (ret < 0) {
+		/* errno is already set by clock_gettime */
+		return (time_t) -1;
+	}
+
+	if (tloc) {
+		*tloc = ts.tv_sec;
+	}
+
+	return ts.tv_sec;
+}
diff --git a/samples/net/civetweb/common/src/libc_extensions.c b/samples/net/civetweb/common/src/libc_extensions.c
index c92c8b11144..5e9e23b4ccf 100644
--- a/samples/net/civetweb/common/src/libc_extensions.c
+++ b/samples/net/civetweb/common/src/libc_extensions.c
@@ -159,11 +159,6 @@ long long strtoll(const char *str, char **endptr, int base)
 	return (long long)strtol(str, endptr, base);
 }
 
-time_t time(time_t *t)
-{
-	return 0;
-}
-
 /*
  * Most of the wrappers below are copies of the wrappers in net/sockets.h,
  * but they are available only if CONFIG_NET_SOCKETS_POSIX_NAMES is enabled