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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/lib/ppc405lib/time.c $ */
/* */
/* OpenPOWER OnChipController Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2015,2016 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
/// \file time.c
/// \brief Implementation of functions from <time.h>
///
/// The following standard APIs are currently supported:
///
/// - clock_gettime() with the single clock id CLOCK_REALTIME
///
/// Since SSX does not currently have any per-thread CPU time statistics, we
/// can not implement process-CPU-time-based APIs like the simple clock() or
/// clock_gettime() with CLOCK_REALTIME.
#include "ssx.h"
#include <errno.h>
#include <time.h>
/// Get time from a timer
///
/// \param clock_id This must be the constant CLOCK_REALTIME defined in
/// <time.h>.
///
/// \param tp A pointer to a struct timespec populated by this API.
///
/// Although the Posix standard requires that clock_gettime() support
/// CLOCK_REALTIME, CLOCK_REALTIME measures standard Unix time (seconds since
/// the epoch) which is not available to SSX. SSX currently only supports
/// CLOCK_MONOTONIC, which is derived from the SSX timebase.
///
/// \returns Either 0 for success, or -EINVAL in the event of an invalid
/// argument (unrecognized \a clock_id, NULL \a tp pointer).
int
clock_gettime(clockid_t clock_id, struct timespec* tp)
{
int rc;
SsxTimebase now;
if ((clock_id != CLOCK_MONOTONIC) || (tp == 0)) {
rc = -EINVAL;
} else {
now = ssx_timebase_get();
tp->tv_sec = now / SSX_TIMEBASE_FREQUENCY_HZ;
tp->tv_nsec =
((now % SSX_TIMEBASE_FREQUENCY_HZ) * 1000000000) /
SSX_TIMEBASE_FREQUENCY_HZ;
rc = 0;
}
return rc;
}
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