Emery Hemingway
3e5ac64ee2
Use the Timer session duration for CLOCK_MONOTONIC and CLOCK_UPTIME. Use the Genode::Duration object for passing internal time, it supports sub-millisecond time and helps disambiguate units of time. Fix #3018
94 lines
1.9 KiB
C++
94 lines
1.9 KiB
C++
/*
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* \brief C-library back end
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* \author Christian Prochaska
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* \author Norman Feske
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* \date 2010-05-19
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*/
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/*
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* Copyright (C) 2010-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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/* Libc includes */
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#include <sys/time.h>
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#include "task.h"
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#include "libc_errno.h"
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namespace Libc { time_t read_rtc(); }
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extern "C" __attribute__((weak))
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int clock_gettime(clockid_t clk_id, struct timespec *ts)
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{
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if (!ts) return Libc::Errno(EFAULT);
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/* initialize timespec just in case users do not check for errors */
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ts->tv_sec = 0;
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ts->tv_nsec = 0;
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switch (clk_id) {
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/* IRL wall-time */
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case CLOCK_REALTIME:
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case CLOCK_SECOND: /* FreeBSD specific */
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{
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static bool initial_rtc_requested = false;
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static time_t initial_rtc = 0;
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static unsigned long t0_ms = 0;
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/* try to read rtc once */
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if (!initial_rtc_requested) {
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initial_rtc_requested = true;
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initial_rtc = Libc::read_rtc();
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if (initial_rtc) {
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t0_ms = Libc::current_time().trunc_to_plain_ms().value;
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}
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}
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if (!initial_rtc) return Libc::Errno(EINVAL);
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unsigned long time = Libc::current_time().trunc_to_plain_ms().value - t0_ms;
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ts->tv_sec = initial_rtc + time/1000;
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ts->tv_nsec = (time % 1000) * (1000*1000);
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break;
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}
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/* component uptime */
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case CLOCK_MONOTONIC:
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case CLOCK_UPTIME:
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{
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unsigned long us = Libc::current_time().trunc_to_plain_us().value;
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ts->tv_sec = us / (1000*1000);
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ts->tv_nsec = (us % (1000*1000)) * 1000;
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break;
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}
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default:
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return Libc::Errno(EINVAL);
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}
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return 0;
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}
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extern "C" __attribute__((weak))
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int gettimeofday(struct timeval *tv, struct timezone *)
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{
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if (!tv) return 0;
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struct timespec ts;
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if (int ret = clock_gettime(CLOCK_REALTIME, &ts))
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return ret;
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tv->tv_sec = ts.tv_sec;
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tv->tv_usec = ts.tv_nsec / 1000;
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return 0;
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}
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