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765936ebae
Problem: - `(void)` simply casts the expression to void. This is understood to indicate that it is ignored, but this is really a compiler trick to get the compiler to not generate a warning. Solution: - Use the `[[maybe_unused]]` attribute to indicate the value is unused. Note: - Functions taking a `(void)` argument list have also been changed to `()` because this is not needed and shows up in the same grep command.
59 lines
2.5 KiB
C++
59 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/Process.h>
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#include <Kernel/Time/TimeManagement.h>
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namespace Kernel {
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unsigned Process::sys$alarm(unsigned seconds)
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{
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REQUIRE_PROMISE(stdio);
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unsigned previous_alarm_remaining = 0;
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if (auto alarm_timer = move(m_alarm_timer)) {
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if (TimerQueue::the().cancel_timer(*alarm_timer)) {
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// The timer hasn't fired. Round up the remaining time (if any)
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timespec remaining;
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timespec_add(alarm_timer->remaining(), { 0, 1000000000 - 1 }, remaining);
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previous_alarm_remaining = remaining.tv_sec;
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}
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// We had an existing alarm, must return a non-zero value here!
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if (previous_alarm_remaining == 0)
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previous_alarm_remaining = 1;
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}
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if (seconds > 0) {
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auto deadline = TimeManagement::the().current_time(CLOCK_REALTIME).value();
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timespec_add(deadline, { seconds, 0 }, deadline);
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m_alarm_timer = TimerQueue::the().add_timer_without_id(CLOCK_REALTIME, deadline, [this]() {
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[[maybe_unused]] auto rc = send_signal(SIGALRM, nullptr);
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});
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}
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return previous_alarm_remaining;
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}
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}
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