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when function clock_gettime() is available and the monotonic timer is also available. Otherwise, in some cases, librt or libposix4 could be used for linking even when finally not using the clock_gettime() function due to lack of the monotonic clock.
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/* $Id$ */
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/* Copyright (C) 2008 by Daniel Stenberg et al
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for any purpose and without fee is hereby granted, provided
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* that the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of M.I.T. not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. M.I.T. makes no representations about the
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* suitability of this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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#include "setup.h"
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#include "ares.h"
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#include "ares_private.h"
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#if defined(WIN32) && !defined(MSDOS)
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struct timeval ares__tvnow(void)
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{
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/*
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** GetTickCount() is available on _all_ Windows versions from W95 up
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** to nowadays. Returns milliseconds elapsed since last system boot,
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** increases monotonically and wraps once 49.7 days have elapsed.
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*/
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struct timeval now;
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DWORD milliseconds = GetTickCount();
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now.tv_sec = milliseconds / 1000;
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now.tv_usec = (milliseconds % 1000) * 1000;
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return now;
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}
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#elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
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struct timeval ares__tvnow(void)
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{
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/*
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** clock_gettime() is granted to be increased monotonically when the
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** monotonic clock is queried. Time starting point is unspecified, it
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** could be the system start-up time, the Epoch, or something else,
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** in any case the time starting point does not change once that the
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** system has started up.
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*/
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struct timeval now;
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struct timespec tsnow;
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(void)clock_gettime(CLOCK_MONOTONIC, &tsnow);
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now.tv_sec = tsnow.tv_sec;
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now.tv_usec = tsnow.tv_nsec / 1000;
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return now;
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}
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#elif defined(HAVE_GETTIMEOFDAY)
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struct timeval ares__tvnow(void)
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{
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/*
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** gettimeofday() is not granted to be increased monotonically, due to
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** clock drifting and external source time synchronization it can jump
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** forward or backward in time.
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*/
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struct timeval now;
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(void)gettimeofday(&now, NULL);
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return now;
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}
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#else
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struct timeval ares__tvnow(void)
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{
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/*
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** time() returns the value of time in seconds since the Epoch.
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*/
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struct timeval now;
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now.tv_sec = (long)time(NULL);
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now.tv_usec = 0;
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return now;
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}
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#endif
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/*
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* Make sure that the first argument is the more recent time, as otherwise
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* we'll get a weird negative time-diff back...
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*
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* Returns: the time difference in number of milliseconds.
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*/
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long ares__tvdiff(struct timeval newer, struct timeval older)
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{
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return (newer.tv_sec-older.tv_sec)*1000+
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(newer.tv_usec-older.tv_usec)/1000;
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}
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