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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Arch/x86/InterruptDisabler.h>
#include <Kernel/Process.h>
namespace Kernel {
ErrorOr<void> Process::do_kill(Process& process, int signal)
{
// FIXME: Allow sending SIGCONT to everyone in the process group.
// FIXME: Should setuid processes have some special treatment here?
if (!is_superuser() && euid() != process.uid() && uid() != process.uid())
return EPERM;
if (process.is_kernel_process()) {
dbgln("Attempted to send signal {} to kernel process {} ({})", signal, process.name(), process.pid());
return EPERM;
}
if (signal != 0)
return process.send_signal(signal, this);
return {};
}
ErrorOr<void> Process::do_killpg(ProcessGroupID pgrp, int signal)
{
InterruptDisabler disabler;
VERIFY(pgrp >= 0);
// Send the signal to all processes in the given group.
if (pgrp == 0) {
// Send the signal to our own pgrp.
pgrp = pgid();
}
bool group_was_empty = true;
bool any_succeeded = false;
ErrorOr<void> error;
Process::for_each_in_pgrp(pgrp, [&](auto& process) {
group_was_empty = false;
ErrorOr<void> res = do_kill(process, signal);
if (!res.is_error())
any_succeeded = true;
else
error = move(res);
});
if (group_was_empty)
return ESRCH;
if (any_succeeded)
return {};
return error;
}
ErrorOr<void> Process::do_killall(int signal)
{
InterruptDisabler disabler;
bool any_succeeded = false;
ErrorOr<void> error;
// Send the signal to all processes we have access to for.
Process::all_instances().for_each([&](auto& process) {
ErrorOr<void> res;
if (process.pid() == pid())
res = do_killself(signal);
else
res = do_kill(process, signal);
if (!res.is_error())
any_succeeded = true;
else
error = move(res);
});
if (any_succeeded)
return {};
return error;
}
ErrorOr<void> Process::do_killself(int signal)
{
if (signal == 0)
return {};
auto* current_thread = Thread::current();
if (!current_thread->should_ignore_signal(signal))
current_thread->send_signal(signal, this);
return {};
}
ErrorOr<FlatPtr> Process::sys$kill(pid_t pid_or_pgid, int signal)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
if (pid_or_pgid == pid().value())
TRY(require_promise(Pledge::stdio));
else
TRY(require_promise(Pledge::proc));
if (signal < 0 || signal >= 32)
return EINVAL;
if (pid_or_pgid < -1) {
if (pid_or_pgid == NumericLimits<i32>::min())
return EINVAL;
TRY(do_killpg(-pid_or_pgid, signal));
return 0;
}
if (pid_or_pgid == -1) {
TRY(do_killall(signal));
return 0;
}
if (pid_or_pgid == pid().value()) {
TRY(do_killself(signal));
return 0;
}
VERIFY(pid_or_pgid >= 0);
auto peer = Process::from_pid(pid_or_pgid);
if (!peer)
return ESRCH;
TRY(do_kill(*peer, signal));
return 0;
}
ErrorOr<FlatPtr> Process::sys$killpg(pid_t pgrp, int signum)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_promise(Pledge::proc));
if (signum < 1 || signum >= 32)
return EINVAL;
if (pgrp < 0)
return EINVAL;
TRY(do_killpg(pgrp, signum));
return 0;
}
}
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