linux-kernel - [PATCH nolibc 40/61] tools/nolibc/time: create time.h with time()

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Date:   Mon, 18 Apr 2022 17:42:04 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     gwml@...r.gnuweeb.org, kernel-team@...com, w@....eu,
        Willy Tarreau <w@....eu>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH nolibc 40/61] tools/nolibc/time: create time.h with time()

From: Willy Tarreau <w@....eu>

The time() syscall is used by a few simple applications, and is trivial
to implement based on gettimeofday() that we already have. Let's create
the file to ease porting and provide the function. It never returns any
error, though it may segfault in case of invalid pointer, like other
implementations relying on gettimeofday().

Signed-off-by: Willy Tarreau <w@....eu>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 tools/include/nolibc/nolibc.h |  1 +
 tools/include/nolibc/time.h   | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 tools/include/nolibc/time.h

diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h
index 0f375e901a36..561dcdb83cee 100644
--- a/tools/include/nolibc/nolibc.h
+++ b/tools/include/nolibc/nolibc.h
@@ -92,6 +92,7 @@
 #include "stdio.h"
 #include "stdlib.h"
 #include "string.h"
+#include "time.h"
 #include "unistd.h"
 
 /* Used by programs to avoid std includes */
diff --git a/tools/include/nolibc/time.h b/tools/include/nolibc/time.h
new file mode 100644
index 000000000000..d18b7661fdd7
--- /dev/null
+++ b/tools/include/nolibc/time.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * time function definitions for NOLIBC
+ * Copyright (C) 2017-2022 Willy Tarreau <w@....eu>
+ */
+
+#ifndef _NOLIBC_TIME_H
+#define _NOLIBC_TIME_H
+
+#include "std.h"
+#include "arch.h"
+#include "types.h"
+#include "sys.h"
+
+static __attribute__((unused))
+time_t time(time_t *tptr)
+{
+	struct timeval tv;
+
+	/* note, cannot fail here */
+	sys_gettimeofday(&tv, NULL);
+
+	if (tptr)
+		*tptr = tv.tv_sec;
+	return tv.tv_sec;
+}
+
+#endif /* _NOLIBC_TIME_H */
-- 
2.31.1.189.g2e36527f23