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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.
73 lines
2.4 KiB
C++
73 lines
2.4 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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#pragma once
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#include <AK/InlineLinkedList.h>
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#include <AK/RefCounted.h>
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#include <AK/Weakable.h>
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#include <Kernel/Lock.h>
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#include <Kernel/SpinLock.h>
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#include <Kernel/UnixTypes.h>
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namespace Kernel {
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class ProcessGroup
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: public RefCounted<ProcessGroup>
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, public Weakable<ProcessGroup>
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, public InlineLinkedListNode<ProcessGroup> {
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AK_MAKE_NONMOVABLE(ProcessGroup);
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AK_MAKE_NONCOPYABLE(ProcessGroup);
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friend InlineLinkedListNode<ProcessGroup>;
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public:
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~ProcessGroup();
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static NonnullRefPtr<ProcessGroup> create(ProcessGroupID);
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static NonnullRefPtr<ProcessGroup> find_or_create(ProcessGroupID);
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static ProcessGroup* from_pgid(ProcessGroupID);
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const ProcessGroupID& pgid() const { return m_pgid; }
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private:
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ProcessGroup(ProcessGroupID pgid)
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: m_pgid(pgid)
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{
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}
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ProcessGroup* m_prev { nullptr };
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ProcessGroup* m_next { nullptr };
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ProcessGroupID m_pgid;
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};
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extern InlineLinkedList<ProcessGroup>* g_process_groups;
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extern RecursiveSpinLock g_process_groups_lock;
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}
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