118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/*
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** OSSP uuid - Universally Unique Identifier
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** Copyright (c) 2004-2008 Ralf S. Engelschall <rse@engelschall.com>
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** Copyright (c) 2004-2008 The OSSP Project <http://www.ossp.org/>
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**
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** This file is part of OSSP uuid, a library for the generation
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** of UUIDs which can found at http://www.ossp.org/pkg/lib/uuid/
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**
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** Permission to use, copy, modify, and distribute this software for
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** any purpose with or without fee is hereby granted, provided that
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** the above copyright notice and this permission notice appear in all
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** copies.
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**
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** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
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** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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** USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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** 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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** uuid_time.c: Time Management
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*/
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/* own headers (part (1/2) */
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#include "uuid_ac.h"
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/* system headers */
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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/* own headers (part (1/2) */
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#include "uuid_time.h"
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/* POSIX gettimeofday(2) abstraction (without timezone) */
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int time_gettimeofday(struct timeval *tv)
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{
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#if defined(HAVE_GETTIMEOFDAY)
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/* Unix/POSIX pass-through */
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return gettimeofday(tv, NULL);
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#elif defined(HAVE_CLOCK_GETTIME)
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/* POSIX emulation */
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1)
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return -1;
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if (tv != NULL) {
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tv->tv_sec = (long)ts.tv_sec;
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tv->tv_usec = (long)ts.tv_nsec / 1000;
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}
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return 0;
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#elif defined(WIN32)
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/* Windows emulation */
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FILETIME ft;
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LARGE_INTEGER li;
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__int64 t;
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static int tzflag;
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#if !defined(__GNUC__)
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#define EPOCHFILETIME 116444736000000000i64
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#else
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#define EPOCHFILETIME 116444736000000000LL
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#endif
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if (tv != NULL) {
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GetSystemTimeAsFileTime(&ft);
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li.LowPart = ft.dwLowDateTime;
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li.HighPart = ft.dwHighDateTime;
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t = li.QuadPart;
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t -= EPOCHFILETIME;
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t /= 10;
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tv->tv_sec = (long)(t / 1000000);
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tv->tv_usec = (long)(t % 1000000);
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}
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return 0;
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#else
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#error neither Win32 GetSystemTimeAsFileTime() nor Unix gettimeofday() nor POSIX clock_gettime() available!
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#endif
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}
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/* BSD usleep(3) abstraction */
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int time_usleep(long usec)
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{
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#if defined(WIN32) && defined(HAVE_SLEEP)
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/* Win32 newer Sleep(3) variant */
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Sleep(usec / 1000);
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#elif defined(WIN32)
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/* Win32 older _sleep(3) variant */
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_sleep(usec / 1000);
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#elif defined(HAVE_NANOSLEEP)
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/* POSIX newer nanosleep(3) variant */
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struct timespec ts;
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ts.tv_sec = 0;
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ts.tv_nsec = 1000 * usec;
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nanosleep(&ts, NULL);
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#else
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/* POSIX older select(2) variant */
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struct timeval tv;
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tv.tv_sec = 0;
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tv.tv_usec = usec;
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select(0, NULL, NULL, NULL, &tv);
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#endif
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return 0;
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}
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