ossp-pkg/uuid/uuid_time.c
1.3
/*
** OSSP uuid - Universally Unique Identifier
** Copyright (c) 2004-2008 Ralf S. Engelschall <rse@engelschall.com>
** Copyright (c) 2004-2008 The OSSP Project <http://www.ossp.org/>
**
** This file is part of OSSP uuid, a library for the generation
** of UUIDs which can found at http://www.ossp.org/pkg/lib/uuid/
**
** Permission to use, copy, modify, and distribute this software for
** any purpose with or without fee is hereby granted, provided that
** the above copyright notice and this permission notice appear in all
** copies.
**
** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
** USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
** OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE.
**
** uuid_time.c: Time Management
*/
/* own headers (part (1/2) */
#include "uuid_ac.h"
/* system headers */
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
/* own headers (part (1/2) */
#include "uuid_time.h"
/* POSIX gettimeofday(2) abstraction (without timezone) */
int time_gettimeofday(struct timeval *tv)
{
#if defined(HAVE_GETTIMEOFDAY)
/* Unix/POSIX pass-through */
return gettimeofday(tv, NULL);
#elif defined(HAVE_CLOCK_GETTIME)
/* POSIX emulation */
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1)
return -1;
if (tv != NULL) {
tv->tv_sec = (long)ts.tv_sec;
tv->tv_usec = (long)ts.tv_nsec / 1000;
}
return 0;
#elif defined(WIN32)
/* Windows emulation */
FILETIME ft;
LARGE_INTEGER li;
__int64 t;
static int tzflag;
#if !defined(__GNUC__)
#define EPOCHFILETIME 116444736000000000i64
#else
#define EPOCHFILETIME 116444736000000000LL
#endif
if (tv != NULL) {
GetSystemTimeAsFileTime(&ft);
li.LowPart = ft.dwLowDateTime;
li.HighPart = ft.dwHighDateTime;
t = li.QuadPart;
t -= EPOCHFILETIME;
t /= 10;
tv->tv_sec = (long)(t / 1000000);
tv->tv_usec = (long)(t % 1000000);
}
return 0;
#else
#error neither Win32 GetSystemTimeAsFileTime() nor Unix gettimeofday() nor POSIX clock_gettime() available!
#endif
}
/* BSD usleep(3) abstraction */
int time_usleep(long usec)
{
#if defined(WIN32) && defined(HAVE_SLEEP)
/* Win32 newer Sleep(3) variant */
Sleep(usec / 1000);
#elif defined(WIN32)
/* Win32 older _sleep(3) variant */
_sleep(usec / 1000);
#elif defined(HAVE_NANOSLEEP)
/* POSIX newer nanosleep(3) variant */
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = 1000 * usec;
nanosleep(&ts, NULL);
#else
/* POSIX older select(2) variant */
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = usec;
select(0, NULL, NULL, NULL, &tv);
#endif
return 0;
}
