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dea62fe93c
There are callers of processes().with or processes().for_each that require interrupts to be disabled. Taking a Mutexe with interrupts disabled is a recipe for deadlock, so convert this to a Spinlock.
137 lines
3.3 KiB
C++
137 lines
3.3 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/Arch/x86/InterruptDisabler.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResult Process::do_kill(Process& process, int signal)
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{
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// FIXME: Allow sending SIGCONT to everyone in the process group.
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// FIXME: Should setuid processes have some special treatment here?
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if (!is_superuser() && euid() != process.uid() && uid() != process.uid())
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return EPERM;
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if (process.is_kernel_process()) {
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dbgln("Attempted to send signal {} to kernel process {} ({})", signal, process.name(), process.pid());
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return EPERM;
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}
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if (signal != 0)
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return process.send_signal(signal, this);
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return KSuccess;
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}
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KResult Process::do_killpg(ProcessGroupID pgrp, int signal)
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{
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InterruptDisabler disabler;
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VERIFY(pgrp >= 0);
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// Send the signal to all processes in the given group.
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if (pgrp == 0) {
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// Send the signal to our own pgrp.
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pgrp = pgid();
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}
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bool group_was_empty = true;
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bool any_succeeded = false;
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KResult error = KSuccess;
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Process::for_each_in_pgrp(pgrp, [&](auto& process) {
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group_was_empty = false;
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KResult res = do_kill(process, signal);
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if (res.is_success())
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any_succeeded = true;
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else
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error = res;
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});
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if (group_was_empty)
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return ESRCH;
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if (any_succeeded)
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return KSuccess;
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return error;
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}
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KResult Process::do_killall(int signal)
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{
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InterruptDisabler disabler;
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bool any_succeeded = false;
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KResult error = KSuccess;
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// Send the signal to all processes we have access to for.
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processes().for_each([&](auto& process) {
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KResult res = KSuccess;
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if (process.pid() == pid())
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res = do_killself(signal);
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else
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res = do_kill(process, signal);
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if (res.is_success())
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any_succeeded = true;
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else
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error = res;
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});
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if (any_succeeded)
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return KSuccess;
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return error;
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}
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KResult Process::do_killself(int signal)
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{
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if (signal == 0)
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return KSuccess;
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auto current_thread = Thread::current();
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if (!current_thread->should_ignore_signal(signal))
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current_thread->send_signal(signal, this);
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return KSuccess;
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}
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KResultOr<FlatPtr> Process::sys$kill(pid_t pid_or_pgid, int signal)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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if (pid_or_pgid == pid().value())
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REQUIRE_PROMISE(stdio);
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else
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REQUIRE_PROMISE(proc);
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if (signal < 0 || signal >= 32)
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return EINVAL;
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if (pid_or_pgid < -1) {
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if (pid_or_pgid == NumericLimits<i32>::min())
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return EINVAL;
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return do_killpg(-pid_or_pgid, signal);
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}
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if (pid_or_pgid == -1)
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return do_killall(signal);
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if (pid_or_pgid == pid().value()) {
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return do_killself(signal);
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}
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VERIFY(pid_or_pgid >= 0);
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auto peer = Process::from_pid(pid_or_pgid);
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if (!peer)
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return ESRCH;
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return do_kill(*peer, signal);
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}
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KResultOr<FlatPtr> Process::sys$killpg(pid_t pgrp, int signum)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(proc);
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if (signum < 1 || signum >= 32)
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return EINVAL;
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if (pgrp < 0)
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return EINVAL;
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return do_killpg(pgrp, signum);
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}
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}
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