From 155f15118a77d2aeab7b177ada78c848778d7d80 Mon Sep 17 00:00:00 2001
From: Warner Losh <imp@FreeBSD.org>
Date: Fri, 30 Jul 2021 17:11:43 -0600
Subject: clock_gettime: Add Linux aliases for CLOCK_*

Linux standardized what we call CLOCK_{REALTIME,MONOTONIC}_FAST as
CLOCK_{REALTIME,MONOTONIC}_COARSE. In addition, Linux spells
CLOCK_UPTIME as CLOCK_BOOTTIME.

Add aliases to time.h and document these new aliases in
clock_gettime(2).

Reviewed by:		vangyzen, kib (prior), dchagin (prior)
Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D30988
---
 sys/sys/_clock_id.h | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'sys/sys')

diff --git a/sys/sys/_clock_id.h b/sys/sys/_clock_id.h
index f0a25ce0f3f1..a88eb063122f 100644
--- a/sys/sys/_clock_id.h
+++ b/sys/sys/_clock_id.h
@@ -85,6 +85,15 @@
 #define	CLOCK_PROCESS_CPUTIME_ID 15
 #endif /* __POSIX_VISIBLE >= 199309 */
 
+/*
+ * Linux compatible names.
+ */
+#if __BSD_VISIBLE
+#define	CLOCK_BOOTTIME		CLOCK_UPTIME
+#define	CLOCK_REALTIME_COARSE	CLOCK_REALTIME_FAST
+#define	CLOCK_MONOTONIC_COARSE	CLOCK_MONOTONIC_FAST
+#endif
+
 #if __BSD_VISIBLE
 #define TIMER_RELTIME	0x0	/* relative timer */
 #endif
-- 
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