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https://github.com/fergalmoran/ladybird.git
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bad6d50b86
This change lays the foundation for making the require_promise return an error hand handling the process abort outside of the syscall implementations, to avoid cases where we would leak resources. It also has the advantage that it makes removes a gs pointer read to look up the current thread, then process for every syscall. We can instead go through the Process this pointer in most cases.
45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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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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ErrorOr<FlatPtr> Process::sys$alarm(unsigned seconds)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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require_promise(Pledge::stdio);
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unsigned previous_alarm_remaining = 0;
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if (m_alarm_timer) {
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bool was_in_use = false;
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if (TimerQueue::the().cancel_timer(*m_alarm_timer, &was_in_use)) {
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// The timer hasn't fired. Round up the remaining time (if any)
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Time remaining = m_alarm_timer->remaining() + Time::from_nanoseconds(999'999'999);
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previous_alarm_remaining = remaining.to_truncated_seconds();
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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 (was_in_use && 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_COARSE);
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deadline = deadline + Time::from_seconds(seconds);
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if (!m_alarm_timer) {
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m_alarm_timer = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) Timer));
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}
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auto timer_was_added = TimerQueue::the().add_timer_without_id(*m_alarm_timer, CLOCK_REALTIME_COARSE, deadline, [this]() {
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[[maybe_unused]] auto rc = send_signal(SIGALRM, nullptr);
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});
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if (!timer_was_added)
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return ENOMEM;
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}
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return previous_alarm_remaining;
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}
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}
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