| 1 | /* $Id: time-linux.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 | #include <sys/syscall.h>
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| 36 | #include <unistd.h>
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| 37 | #ifndef __NR_clock_gettime
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| 38 | # define __NR_timer_create 259
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| 39 | # define __NR_clock_gettime (__NR_timer_create+6)
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| 40 | #endif
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| 41 |
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| 42 | #include <iprt/time.h>
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| 43 | #include "internal/time.h"
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| 44 |
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| 45 |
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| 46 | DECLINLINE(int) sys_clock_gettime(clockid_t id, struct timespec *ts)
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| 47 | {
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| 48 | int rc = syscall(__NR_clock_gettime, id, ts);
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| 49 | if (rc >= 0)
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| 50 | return rc;
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| 51 | return -1;
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| 52 | }
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| 53 |
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| 54 |
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| 55 | /**
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| 56 | * Wrapper around various monotone time sources.
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| 57 | */
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| 58 | DECLINLINE(int) mono_clock(struct timespec *ts)
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| 59 | {
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| 60 | static int iWorking = -1;
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| 61 | switch (iWorking)
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| 62 | {
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| 63 | #ifdef CLOCK_MONOTONIC
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| 64 | /*
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| 65 | * Standard clock_gettime()
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| 66 | */
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| 67 | case 0:
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| 68 | return clock_gettime(CLOCK_MONOTONIC, ts);
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| 69 |
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| 70 | /*
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| 71 | * Syscall clock_gettime().
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| 72 | */
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| 73 | case 1:
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| 74 | return sys_clock_gettime(CLOCK_MONOTONIC, ts);
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| 75 |
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| 76 | #endif /* CLOCK_MONOTONIC */
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| 77 |
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| 78 |
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| 79 | /*
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| 80 | * Figure out what's working.
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| 81 | */
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| 82 | case -1:
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| 83 | {
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| 84 | #ifdef CLOCK_MONOTONIC
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| 85 | /*
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| 86 | * Real-Time API.
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| 87 | */
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| 88 | int rc = clock_gettime(CLOCK_MONOTONIC, ts);
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| 89 | if (!rc)
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| 90 | {
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| 91 | iWorking = 0;
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| 92 | return 0;
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| 93 | }
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| 94 |
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| 95 | rc = sys_clock_gettime(CLOCK_MONOTONIC, ts);
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| 96 | if (!rc)
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| 97 | {
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| 98 | iWorking = 1;
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| 99 | return 0;
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| 100 | }
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| 101 | #endif /* CLOCK_MONOTONIC */
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| 102 |
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| 103 | /* give up */
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| 104 | iWorking = -2;
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| 105 | break;
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| 106 | }
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| 107 | }
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| 108 | return -1;
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| 109 | }
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| 110 |
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| 111 |
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| 112 | DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
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| 113 | {
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| 114 | /* check monotonic clock first. */
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| 115 | static bool fMonoClock = true;
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| 116 | if (fMonoClock)
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| 117 | {
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| 118 | struct timespec ts;
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| 119 | if (!mono_clock(&ts))
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| 120 | return (uint64_t)ts.tv_sec * RT_NS_1SEC_64
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| 121 | + ts.tv_nsec;
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| 122 | fMonoClock = false;
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| 123 | }
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| 124 |
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| 125 | /* fallback to gettimeofday(). */
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| 126 | struct timeval tv;
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| 127 | gettimeofday(&tv, NULL);
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| 128 | return (uint64_t)tv.tv_sec * RT_NS_1SEC_64
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| 129 | + (uint64_t)(tv.tv_usec * RT_NS_1US);
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| 130 | }
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| 131 |
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| 132 |
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| 133 | /**
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| 134 | * Gets the current nanosecond timestamp.
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| 135 | *
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| 136 | * This differs from RTTimeNanoTS in that it will use system APIs and not do any
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| 137 | * resolution or performance optimizations.
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| 138 | *
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| 139 | * @returns nanosecond timestamp.
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| 140 | */
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| 141 | RTDECL(uint64_t) RTTimeSystemNanoTS(void)
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| 142 | {
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| 143 | return rtTimeGetSystemNanoTS();
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| 144 | }
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| 145 |
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| 146 |
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| 147 | /**
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| 148 | * Gets the current millisecond timestamp.
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| 149 | *
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| 150 | * This differs from RTTimeNanoTS in that it will use system APIs and not do any
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| 151 | * resolution or performance optimizations.
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| 152 | *
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| 153 | * @returns millisecond timestamp.
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| 154 | */
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| 155 | RTDECL(uint64_t) RTTimeSystemMilliTS(void)
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| 156 | {
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| 157 | return rtTimeGetSystemNanoTS() / RT_NS_1MS;
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| 158 | }
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| 159 |
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