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/* $Id: time-linux.cpp $ */
/** @file
* IPRT - Time, POSIX.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP RTLOGGROUP_TIME
#define RTTIME_INCL_TIMEVAL
#include <sys/time.h>
#include <time.h>
#include <sys/syscall.h>
#include <unistd.h>
#ifndef __NR_clock_gettime
# define __NR_timer_create 259
# define __NR_clock_gettime (__NR_timer_create+6)
#endif
#include <iprt/time.h>
#include "internal/time.h"
DECLINLINE(int) sys_clock_gettime(clockid_t id, struct timespec *ts)
{
int rc = syscall(__NR_clock_gettime, id, ts);
if (rc >= 0)
return rc;
return -1;
}
/**
* Wrapper around various monotone time sources.
*/
DECLINLINE(int) mono_clock(struct timespec *ts)
{
static int iWorking = -1;
switch (iWorking)
{
#ifdef CLOCK_MONOTONIC
/*
* Standard clock_gettime()
*/
case 0:
return clock_gettime(CLOCK_MONOTONIC, ts);
/*
* Syscall clock_gettime().
*/
case 1:
return sys_clock_gettime(CLOCK_MONOTONIC, ts);
#endif /* CLOCK_MONOTONIC */
/*
* Figure out what's working.
*/
case -1:
{
#ifdef CLOCK_MONOTONIC
/*
* Real-Time API.
*/
int rc = clock_gettime(CLOCK_MONOTONIC, ts);
if (!rc)
{
iWorking = 0;
return 0;
}
rc = sys_clock_gettime(CLOCK_MONOTONIC, ts);
if (!rc)
{
iWorking = 1;
return 0;
}
#endif /* CLOCK_MONOTONIC */
/* give up */
iWorking = -2;
break;
}
}
return -1;
}
DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
{
/* check monotonic clock first. */
static bool fMonoClock = true;
if (fMonoClock)
{
struct timespec ts;
if (!mono_clock(&ts))
return (uint64_t)ts.tv_sec * RT_NS_1SEC_64
+ ts.tv_nsec;
fMonoClock = false;
}
/* fallback to gettimeofday(). */
struct timeval tv;
gettimeofday(&tv, NULL);
return (uint64_t)tv.tv_sec * RT_NS_1SEC_64
+ (uint64_t)(tv.tv_usec * RT_NS_1US);
}
/**
* Gets the current nanosecond timestamp.
*
* This differs from RTTimeNanoTS in that it will use system APIs and not do any
* resolution or performance optimizations.
*
* @returns nanosecond timestamp.
*/
RTDECL(uint64_t) RTTimeSystemNanoTS(void)
{
return rtTimeGetSystemNanoTS();
}
/**
* Gets the current millisecond timestamp.
*
* This differs from RTTimeNanoTS in that it will use system APIs and not do any
* resolution or performance optimizations.
*
* @returns millisecond timestamp.
*/
RTDECL(uint64_t) RTTimeSystemMilliTS(void)
{
return rtTimeGetSystemNanoTS() / RT_NS_1MS;
}
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