FreeBSD/Linux Kernel Cross Reference
sys/sys/_clock_id.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause
      *
      * Copyright (c) 2021 Netflix, 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.
     *
     * 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.
     */
    
    #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 */
    
    /*
     * 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
    #if __POSIX_VISIBLE >= 199309
    #define TIMER_ABSTIME   0x1     /* absolute timer */
    #endif /* __POSIX_VISIBLE >= 199309 */
    
    #endif /* _SYS_SYS__CLOCK_ID_H */

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