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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS 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 COPYRIGHT HOLDER OR 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.
*/
#include <Kernel/Process.h>
#include <Kernel/Time/TimeManagement.h>
namespace Kernel {
int Process::sys$clock_gettime(clockid_t clock_id, Userspace<timespec*> user_ts)
{
REQUIRE_PROMISE(stdio);
if (!validate_write_typed(user_ts))
return -EFAULT;
timespec ts = {};
switch (clock_id) {
case CLOCK_MONOTONIC:
ts.tv_sec = TimeManagement::the().seconds_since_boot();
ts.tv_nsec = TimeManagement::the().ticks_this_second() * 1000000;
break;
case CLOCK_REALTIME:
ts.tv_sec = TimeManagement::the().epoch_time();
ts.tv_nsec = TimeManagement::the().ticks_this_second() * 1000000;
break;
default:
return -EINVAL;
}
copy_to_user(user_ts, &ts);
return 0;
}
int Process::sys$clock_settime(clockid_t clock_id, Userspace<const timespec*> user_ts)
{
REQUIRE_PROMISE(settime);
if (!is_superuser())
return -EPERM;
timespec ts;
if (!validate_read_and_copy_typed(&ts, user_ts))
return -EFAULT;
switch (clock_id) {
case CLOCK_REALTIME:
TimeManagement::the().set_epoch_time(ts.tv_sec);
break;
default:
return -EINVAL;
}
return 0;
}
int Process::sys$clock_nanosleep(Userspace<const Syscall::SC_clock_nanosleep_params*> user_params)
{
REQUIRE_PROMISE(stdio);
Syscall::SC_clock_nanosleep_params params;
if (!validate_read_and_copy_typed(¶ms, user_params))
return -EFAULT;
if (params.requested_sleep && !validate_read_typed(params.requested_sleep))
return -EFAULT;
timespec requested_sleep;
copy_from_user(&requested_sleep, params.requested_sleep);
if (params.remaining_sleep && !validate_write_typed(params.remaining_sleep))
return -EFAULT;
bool is_absolute = params.flags & TIMER_ABSTIME;
switch (params.clock_id) {
case CLOCK_MONOTONIC: {
u64 wakeup_time;
if (is_absolute) {
u64 time_to_wake = (requested_sleep.tv_sec * 1000 + requested_sleep.tv_nsec / 1000000);
wakeup_time = Thread::current()->sleep_until(time_to_wake);
} else {
u64 ticks_to_sleep = requested_sleep.tv_sec * TimeManagement::the().ticks_per_second();
ticks_to_sleep += requested_sleep.tv_nsec * TimeManagement::the().ticks_per_second() / 1000000000;
if (!ticks_to_sleep)
return 0;
wakeup_time = Thread::current()->sleep(ticks_to_sleep);
}
if (wakeup_time > g_uptime) {
u64 ticks_left = wakeup_time - g_uptime;
if (!is_absolute && params.remaining_sleep) {
if (!validate_write_typed(params.remaining_sleep)) {
// This can happen because the lock is dropped while
// sleeping, thus giving other threads the opportunity
// to make the region unwritable.
return -EFAULT;
}
timespec remaining_sleep = {};
remaining_sleep.tv_sec = ticks_left / TimeManagement::the().ticks_per_second();
ticks_left -= remaining_sleep.tv_sec * TimeManagement::the().ticks_per_second();
remaining_sleep.tv_nsec = ticks_left * 1000000000 / TimeManagement::the().ticks_per_second();
copy_to_user(params.remaining_sleep, &remaining_sleep);
}
return -EINTR;
}
return 0;
}
default:
return -EINVAL;
}
}
int Process::sys$gettimeofday(Userspace<timeval*> user_tv)
{
REQUIRE_PROMISE(stdio);
if (!validate_write_typed(user_tv))
return -EFAULT;
auto tv = kgettimeofday();
copy_to_user(user_tv, &tv);
return 0;
}
}
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