| 1 | /* $Id: time-posix.cpp 62477 2016-07-22 18:27:37Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Time, POSIX.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2016 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #define LOG_GROUP RTLOGGROUP_TIME
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| 32 | #define RTTIME_INCL_TIMEVAL
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| 33 | #include <sys/time.h>
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| 34 | #include <time.h>
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| 35 |
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| 36 | #include <iprt/time.h>
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| 37 | #include "internal/time.h"
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| 38 |
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| 39 |
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| 40 | DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
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| 41 | {
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| 42 | #if defined(CLOCK_MONOTONIC) && !defined(RT_OS_L4) && !defined(RT_OS_OS2)
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| 43 | /* check monotonic clock first. */
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| 44 | static bool s_fMonoClock = true;
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| 45 | if (s_fMonoClock)
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| 46 | {
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| 47 | struct timespec ts;
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| 48 | if (!clock_gettime(CLOCK_MONOTONIC, &ts))
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| 49 | return (uint64_t)ts.tv_sec * RT_NS_1SEC_64
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| 50 | + ts.tv_nsec;
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| 51 | s_fMonoClock = false;
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| 52 | }
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| 53 | #endif
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| 54 |
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| 55 | /* fallback to gettimeofday(). */
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| 56 | struct timeval tv;
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| 57 | gettimeofday(&tv, NULL);
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| 58 | return (uint64_t)tv.tv_sec * RT_NS_1SEC_64
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| 59 | + (uint64_t)(tv.tv_usec * RT_NS_1US);
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| 60 | }
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| 61 |
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| 62 |
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| 63 | /**
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| 64 | * Gets the current nanosecond timestamp.
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| 65 | *
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| 66 | * This differs from RTTimeNanoTS in that it will use system APIs and not do any
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| 67 | * resolution or performance optimizations.
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| 68 | *
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| 69 | * @returns nanosecond timestamp.
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| 70 | */
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| 71 | RTDECL(uint64_t) RTTimeSystemNanoTS(void)
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| 72 | {
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| 73 | return rtTimeGetSystemNanoTS();
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| 74 | }
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| 75 |
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| 76 |
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| 77 | /**
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| 78 | * Gets the current millisecond timestamp.
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| 79 | *
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| 80 | * This differs from RTTimeNanoTS in that it will use system APIs and not do any
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| 81 | * resolution or performance optimizations.
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| 82 | *
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| 83 | * @returns millisecond timestamp.
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| 84 | */
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| 85 | RTDECL(uint64_t) RTTimeSystemMilliTS(void)
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| 86 | {
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| 87 | return rtTimeGetSystemNanoTS() / RT_NS_1MS;
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| 88 | }
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| 89 |
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