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// ------------------------------------------------------------------------
// kvu_timestamp.cpp: Monotonic timestamps
// Copyright (C) 2009 Kai Vehmanen
//
// Attributes:
// eca-style-version: 3
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// ------------------------------------------------------------------------
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/* note: code assumes timespect struct to be defined in
* time.h (i.e. SUSv2 or later) */
#include <time.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <kvu_timestamp.h>
#if HAVE_CLOCK_GETTIME
/* IMPLEMENTATION: clock_gettime() */
/* *********************************/
int kvu_clock_is_monotonic(void)
{
int res = -1;
#if defined CLOCK_MONOTONIC
struct timespec tp;
res = clock_getres(CLOCK_MONOTONIC, &tp);
#endif
if (res == 0)
return 1;
return 0;
}
int kvu_clock_getres(struct timespec *dst)
{
struct timespec tp;
int res = -1;
#if defined CLOCK_MONOTONIC
res = clock_getres(CLOCK_MONOTONIC, &tp);
#endif
if (res < 0)
res =
clock_getres(CLOCK_REALTIME, &tp);
if (res == 0) {
dst->tv_sec = tp.tv_sec;
dst->tv_sec = tp.tv_nsec;
}
return res;
}
int kvu_clock_gettime(struct timespec *dst)
{
struct timespec tp;
int res = -1;
#if defined CLOCK_MONOTONIC
res = clock_gettime(CLOCK_MONOTONIC, &tp);
#endif
if (res < 0)
res =
clock_gettime(CLOCK_REALTIME, &tp);
if (res == 0) {
dst->tv_sec = tp.tv_sec;
dst->tv_nsec = tp.tv_nsec;
}
return res;
}
#elif HAVE_GETTIMEOFDAY
/* IMPLEMENTATION: gettimeofday() */
/* ********************************/
int kvu_clock_is_monotonic(void)
{
return 0;
}
int kvu_clock_getres(struct timespec *arg)
{
/* note: an estimate, actual resolution may
* be worse */
arg->tv_sec = 0;
arg->tv_nsec = 1000;
return 0;
}
int kvu_clock_gettime(struct timespec *arg)
{
struct timeval tmp;
int res =
gettimeofday(&tmp, NULL);
if (res == 0) {
arg->tv_sec = tmp.tv_sec;
arg->tv_nsec = tmp.tv_usec * 1000;
}
return res;
}
#else
/* IMPLEMENTATION: fallback / no-op */
/* **********************************/
int kvu_clock_is_monotonic(void)
{
DBC_NEVER_REACHED();
return 0;
}
int kvu_clock_getres(struct timespec *res)
{
DBC_NEVER_REACHED();
return -1;
}
int kvu_clock_gettime(struct timespec *tp)
{
DBC_NEVER_REACHED();
return -1;
}
#endif
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