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688e54eac7
This does not add any behaviour change to the processes, but it ties a TTY to an active process group via TIOCSPGRP, and returns the TTY to the kernel when all processes in the process group die. Also makes the TTY keep a link to the original controlling process' parent (for SIGCHLD) instead of the process itself.
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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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 "ProcessGroup.h"
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namespace Kernel {
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RecursiveSpinLock g_process_groups_lock;
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InlineLinkedList<ProcessGroup>* g_process_groups;
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ProcessGroup::~ProcessGroup()
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{
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ScopedSpinLock lock(g_process_groups_lock);
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g_process_groups->remove(this);
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}
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NonnullRefPtr<ProcessGroup> ProcessGroup::create(ProcessGroupID pgid)
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{
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auto process_group = adopt(*new ProcessGroup(pgid));
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{
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ScopedSpinLock lock(g_process_groups_lock);
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g_process_groups->prepend(process_group);
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}
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return process_group;
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}
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NonnullRefPtr<ProcessGroup> ProcessGroup::find_or_create(ProcessGroupID pgid)
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{
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if (auto existing = from_pgid(pgid))
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return *existing;
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return create(pgid);
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}
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ProcessGroup* ProcessGroup::from_pgid(ProcessGroupID pgid)
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{
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ScopedSpinLock lock(g_process_groups_lock);
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for (auto& group : *g_process_groups) {
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if (group.pgid() == pgid)
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return &group;
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}
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return nullptr;
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}
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}
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