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Index: lib/libc/sys/clock_gettime.2
===================================================================
--- lib/libc/sys/clock_gettime.2
+++ lib/libc/sys/clock_gettime.2
@@ -29,7 +29,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd May 13, 2021
+.Dd July 1, 2021
.Dt CLOCK_GETTIME 2
.Os
.Sh NAME
@@ -68,14 +68,17 @@
.It Dv CLOCK_REALTIME
.It Dv CLOCK_REALTIME_PRECISE
.It Dv CLOCK_REALTIME_FAST
+.It Dv CLOCK_REALTIME_COARSE
Increments as a wall clock should.
.It Dv CLOCK_MONOTONIC
.It Dv CLOCK_MONOTONIC_PRECISE
.It Dv CLOCK_MONOTONIC_FAST
+.It Dv CLOCK_MONOTONIC_COARSE
Increments in SI seconds.
.It Dv CLOCK_UPTIME
.It Dv CLOCK_UPTIME_PRECISE
.It Dv CLOCK_UPTIME_FAST
+.It Dv CLOCK_BOOTTIME
Starts at zero when the kernel boots and increments
monotonically in SI seconds while the machine is running.
.It Dv CLOCK_VIRTUAL
@@ -104,6 +107,16 @@
.Fa CLOCK_UPTIME_PRECISE
are used to get the most exact value as possible, at the expense of
execution time.
+The clock IDs
+.Fa CLOCK_REALTIME_COARSE ,
+.Fa CLOCK_MONOTONIC_COARSE
+are aliases of corresponding IDs with _FAST suffix for compatibility with other
+systems.
+Finally,
+.Dv CLOCK_BOOTTIME
+is an alias for
+.Dv CLOCK_UPTIME
+for compatibility with other systems.
.Pp
The structure pointed to by
.Fa tp
Index: sys/sys/time.h
===================================================================
--- sys/sys/time.h
+++ sys/sys/time.h
@@ -491,6 +491,10 @@
#define CLOCK_SECOND 13 /* FreeBSD-specific. */
#define CLOCK_THREAD_CPUTIME_ID 14
#define CLOCK_PROCESS_CPUTIME_ID 15
+
+#define CLOCK_BOOTTIME CLOCK_UPTIME /* Linux compat */
+#define CLOCK_REALTIME_COARSE CLOCK_REALTIME_FAST /* Linux compat */
+#define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC_FAST /* Linux compat */
#endif
#ifndef TIMER_ABSTIME

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