mirror of https://github.com/c-ares/c-ares.git
Yang Tse
17 years ago
parent
fd5fdecf30
commit
0848b4fdaa
10 changed files with 113 additions and 40 deletions
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/* $Id$ */ |
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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) && defined(CLOCK_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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