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diff --git a/include/time.h b/include/time.h
--- a/include/time.h
+++ b/include/time.h
@@ -46,6 +46,7 @@
#include <sys/cdefs.h>
#include <sys/_null.h>
#include <sys/_types.h>
+#include <sys/_clock_id.h>
#if __POSIX_VISIBLE > 0 && __POSIX_VISIBLE < 200112 || __BSD_VISIBLE
/*
@@ -97,35 +98,6 @@
#endif
#endif
-/* These macros are also in sys/time.h. */
-#if !defined(CLOCK_REALTIME) && __POSIX_VISIBLE >= 199506
-#define CLOCK_REALTIME 0
-#endif /* !defined(CLOCK_REALTIME) && __POSIX_VISIBLE >= 199506 */
-#if !defined(CLOCK_VIRTUAL) && __BSD_VISIBLE
-#define CLOCK_VIRTUAL 1
-#define CLOCK_PROF 2
-#endif /* !defined(CLOCK_VIRTUAL) && __BSD_VISIBLE */
-#if !defined(CLOCK_MONOTONIC) && __POSIX_VISIBLE >= 200112
-#define CLOCK_MONOTONIC 4
-#define CLOCK_UPTIME 5 /* FreeBSD-specific. */
-#define CLOCK_UPTIME_PRECISE 7 /* FreeBSD-specific. */
-#define CLOCK_UPTIME_FAST 8 /* FreeBSD-specific. */
-#define CLOCK_REALTIME_PRECISE 9 /* FreeBSD-specific. */
-#define CLOCK_REALTIME_FAST 10 /* FreeBSD-specific. */
-#define CLOCK_MONOTONIC_PRECISE 11 /* FreeBSD-specific. */
-#define CLOCK_MONOTONIC_FAST 12 /* FreeBSD-specific. */
-#define CLOCK_SECOND 13 /* FreeBSD-specific. */
-#define CLOCK_THREAD_CPUTIME_ID 14
-#define CLOCK_PROCESS_CPUTIME_ID 15
-#endif /* !defined(CLOCK_MONOTONIC) && __POSIX_VISIBLE >= 200112 */
-
-#if __BSD_VISIBLE
-#define TIMER_RELTIME 0x0 /* relative timer */
-#endif
-#if !defined(TIMER_ABSTIME) && __POSIX_VISIBLE >= 199506
-#define TIMER_ABSTIME 0x1 /* absolute timer */
-#endif /* !defined(TIMER_ABSTIME) && __POSIX_VISIBLE >= 199506 */
-
struct tm {
int tm_sec; /* seconds after the minute [0-60] */
int tm_min; /* minutes after the hour [0-59] */
diff --git a/sys/sys/_clock_id.h b/sys/sys/_clock_id.h
new file mode 100644
--- /dev/null
+++ b/sys/sys/_clock_id.h
@@ -0,0 +1,95 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1989, 1993
+ * The Regents of the University of California. All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)time.h 8.3 (Berkeley) 1/21/94
+ */
+
+#ifndef _SYS_SYS__CLOCK_ID_H
+#define _SYS_SYS__CLOCK_ID_H
+
+/*
+ * These macros are shared between time.h and sys/time.h.
+ */
+
+/*
+ * Note: The values shown below as a comment for the __POSIX_VISIBLE values are
+ * the ones FreeBSD traditionally used based on our reading of the POSIX
+ * standards. However, glibc uses 199309 for all of them, even those many were
+ * not defined there. To remain bug compatible with glibc means more software
+ * that relied on the glibc behavior will compile easily on FreeBSD.
+ *
+ * Also, CLOCK_UPTIME_FAST is improperly visible temporarily for the lang/pocl
+ * port until it can be updated properly. It incorrectly assumes that this was a
+ * standard value. It will be moved back to the __BSD_VISIBLE section once the
+ * issue is corrected.
+ */
+
+#if __POSIX_VISIBLE >= 199309 /* 199506 */
+#define CLOCK_REALTIME 0
+#endif /* __POSIX_VISIBLE >= 199309 */
+#ifdef __BSD_VISIBLE
+#define CLOCK_VIRTUAL 1
+#define CLOCK_PROF 2
+#endif /* __BSD_VISIBLE */
+#if __POSIX_VISIBLE >= 199309 /* 200112 */
+#define CLOCK_MONOTONIC 4
+#define CLOCK_UPTIME_FAST 8
+#endif /* __POSIX_VISIBLE >= 199309 */
+#ifdef __BSD_VISIBLE
+/*
+ * FreeBSD-specific clocks.
+ */
+#define CLOCK_UPTIME 5
+#define CLOCK_UPTIME_PRECISE 7
+#define CLOCK_REALTIME_PRECISE 9
+#define CLOCK_REALTIME_FAST 10
+#define CLOCK_MONOTONIC_PRECISE 11
+#define CLOCK_MONOTONIC_FAST 12
+#define CLOCK_SECOND 13
+#endif /* __BSD_VISIBLE */
+
+#if __POSIX_VISIBLE >= 199309 /* 200112 */
+#define CLOCK_THREAD_CPUTIME_ID 14
+#define CLOCK_PROCESS_CPUTIME_ID 15
+#endif /* __POSIX_VISIBLE >= 199309 */
+
+#if __BSD_VISIBLE
+#define TIMER_RELTIME 0x0 /* relative timer */
+#endif
+#if __POSIX_VISIBLE >= 199309
+#define TIMER_ABSTIME 0x1 /* absolute timer */
+#endif /* __POSIX_VISIBLE >= 199309 */
+
+#endif /* _SYS_SYS__CLOCK_ID_H */
diff --git a/sys/sys/time.h b/sys/sys/time.h
--- a/sys/sys/time.h
+++ b/sys/sys/time.h
@@ -38,6 +38,7 @@
#include <sys/_timeval.h>
#include <sys/types.h>
#include <sys/timespec.h>
+#include <sys/_clock_id.h>
struct timezone {
int tz_minuteswest; /* minutes west of Greenwich */
@@ -471,33 +472,6 @@
int profhz; /* profiling clock frequency */
};
-/* These macros are also in time.h. */
-#ifndef CLOCK_REALTIME
-#define CLOCK_REALTIME 0
-#endif
-#ifndef CLOCK_VIRTUAL
-#define CLOCK_VIRTUAL 1
-#define CLOCK_PROF 2
-#endif
-#ifndef CLOCK_MONOTONIC
-#define CLOCK_MONOTONIC 4
-#define CLOCK_UPTIME 5 /* FreeBSD-specific. */
-#define CLOCK_UPTIME_PRECISE 7 /* FreeBSD-specific. */
-#define CLOCK_UPTIME_FAST 8 /* FreeBSD-specific. */
-#define CLOCK_REALTIME_PRECISE 9 /* FreeBSD-specific. */
-#define CLOCK_REALTIME_FAST 10 /* FreeBSD-specific. */
-#define CLOCK_MONOTONIC_PRECISE 11 /* FreeBSD-specific. */
-#define CLOCK_MONOTONIC_FAST 12 /* FreeBSD-specific. */
-#define CLOCK_SECOND 13 /* FreeBSD-specific. */
-#define CLOCK_THREAD_CPUTIME_ID 14
-#define CLOCK_PROCESS_CPUTIME_ID 15
-#endif
-
-#ifndef TIMER_ABSTIME
-#define TIMER_RELTIME 0x0 /* relative timer */
-#define TIMER_ABSTIME 0x1 /* absolute timer */
-#endif
-
#if __BSD_VISIBLE
#define CPUCLOCK_WHICH_PID 0
#define CPUCLOCK_WHICH_TID 1

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