119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
/*
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* Copyright (c) 2018 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <kernel.h>
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#include <errno.h>
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#include <posix/time.h>
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#include <posix/sys/time.h>
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#include <syscall_handler.h>
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/*
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* `k_uptime_get` returns a timestamp based on an always increasing
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* value from the system start. To support the `CLOCK_REALTIME`
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* clock, this `rt_clock_base` records the time that the system was
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* started. This can either be set via 'clock_settime', or could be
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* set from a real time clock, if such hardware is present.
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*/
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static struct timespec rt_clock_base;
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/**
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* @brief Get clock time specified by clock_id.
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*
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* See IEEE 1003.1
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*/
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int z_impl_clock_gettime(clockid_t clock_id, struct timespec *ts)
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{
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u64_t elapsed_msecs;
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struct timespec base;
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switch (clock_id) {
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case CLOCK_MONOTONIC:
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base.tv_sec = 0;
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base.tv_nsec = 0;
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break;
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case CLOCK_REALTIME:
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base = rt_clock_base;
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break;
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default:
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errno = EINVAL;
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return -1;
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}
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elapsed_msecs = k_uptime_get();
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ts->tv_sec = (s32_t) (elapsed_msecs / MSEC_PER_SEC);
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ts->tv_nsec = (s32_t) ((elapsed_msecs % MSEC_PER_SEC) *
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USEC_PER_MSEC * NSEC_PER_USEC);
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ts->tv_sec += base.tv_sec;
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ts->tv_nsec += base.tv_nsec;
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if (ts->tv_nsec >= NSEC_PER_SEC) {
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ts->tv_sec++;
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ts->tv_nsec -= NSEC_PER_SEC;
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}
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return 0;
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}
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#ifdef CONFIG_USERSPACE
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int z_vrfy_clock_gettime(clockid_t clock_id, struct timespec *ts)
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{
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Z_OOPS(Z_SYSCALL_MEMORY_WRITE(ts, sizeof(*ts)));
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return z_impl_clock_gettime(clock_id, ts);
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}
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#include <syscalls/clock_gettime_mrsh.c>
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#endif
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/**
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* @brief Set the time of the specified clock.
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*
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* See IEEE 1003.1.
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*
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* Note that only the `CLOCK_REALTIME` clock can be set using this
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* call.
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*/
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int clock_settime(clockid_t clock_id, const struct timespec *tp)
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{
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struct timespec base;
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if (clock_id != CLOCK_REALTIME) {
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errno = EINVAL;
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return -1;
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}
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u64_t elapsed_msecs = k_uptime_get();
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s64_t delta = (s64_t)NSEC_PER_SEC * tp->tv_sec + tp->tv_nsec
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- elapsed_msecs * USEC_PER_MSEC * NSEC_PER_USEC;
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base.tv_sec = delta / NSEC_PER_SEC;
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base.tv_nsec = delta % NSEC_PER_SEC;
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rt_clock_base = base;
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return 0;
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}
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/**
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* @brief Get current real time.
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*
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* See IEEE 1003.1
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*/
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int gettimeofday(struct timeval *tv, const void *tz)
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{
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struct timespec ts;
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int res;
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/* As per POSIX, "if tzp is not a null pointer, the behavior
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* is unspecified." "tzp" is the "tz" parameter above. */
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ARG_UNUSED(tz);
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res = clock_gettime(CLOCK_REALTIME, &ts);
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tv->tv_sec = ts.tv_sec;
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tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;
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return res;
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}
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