POSIX/C11: add timespec_get()

Change-Id: I746e32f3a463bf2c7b03097c625901d54cf2b8eb
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4853
Reviewed-by: Rene Gollent <[email protected]>

headers/posix/time.h

@@ -25,6 +25,7 @@ typedef __haiku_int64 time_t;
 
 #define CLOCKS_PER_SEC	1000000
 #define CLK_TCK			CLOCKS_PER_SEC
+#define TIME_UTC		1
 
 #define MAX_TIMESTR		70
 	/* maximum length of a string returned by asctime(), and ctime() */
@@ -110,6 +111,9 @@ int		timer_settime(timer_t timerID, int flags,
 			const struct itimerspec* value, struct itimerspec* oldValue);
 int		timer_getoverrun(timer_t timerID);
 
+/* C11 timespec */
+int		timespec_get(struct timespec *ts, int base);
+
 /* special timezone support */
 extern void tzset(void);
 

src/system/libroot/posix/time/timespec_get.cpp

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2022, Jérôme Duval, [email protected].
+ * Distributed under the terms of the MIT License.
+ */
+
+
+#include <time.h>
+
+#include <OS.h>
+#include <SupportDefs.h>
+
+
+int
+timespec_get(struct timespec* time, int base)
+{
+	if (base != TIME_UTC)
+		return 0;
+	bigtime_t microSeconds = real_time_clock_usecs();
+
+	// set the result
+	time->tv_sec = microSeconds / 1000000;
+	time->tv_nsec = (microSeconds % 1000000) * 1000;
+	return base;
+}
+