21edf366ea
Quote from Linux Programmer's Manual: "If t is non-NULL, the return value is also stored in the memory pointed to by t." Change-Id: I8cb66b67e5f34c536ce2f0db76a6dc337c42ea3f Signed-off-by: Jim Huang <jserv@0xlab.org>
66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
/* $OpenBSD: time.c,v 1.5 2005/08/08 08:05:34 espie Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <time.h>
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time_t
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time(time_t *t)
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{
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struct timeval tt;
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time_t ret;
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if (gettimeofday(&tt, (struct timezone *)0) < 0)
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ret = -1;
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else
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ret = tt.tv_sec;
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if (t != NULL)
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*t = ret;
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return ret;
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}
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clock_t
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clock(void)
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{
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struct timespec tm;
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static int clock_inited;
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static clock_t clock_start;
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clock_t now;
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clock_gettime( CLOCK_MONOTONIC, &tm);
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now = tm.tv_sec * CLOCKS_PER_SEC + (tm.tv_nsec * (CLOCKS_PER_SEC/1e9));
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if (!clock_inited) {
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clock_start = now;
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clock_inited = 1;
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}
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return now - clock_start;
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}
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