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Kernel: Distinguish between new and old process groups with equal pgids

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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.
This commit is contained in:
AnotherTest 2020-08-15 23:43:19 +04:30 • committed by Andreas Kling
parent cf18bff72a
commit 688e54eac7
9 changed files with 176 additions and 23 deletions
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72
Kernel/ProcessGroup.h Normal file
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/*
* Copyright (c) 2020, the SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/InlineLinkedList.h>
#include <AK/RefCounted.h>
#include <AK/Weakable.h>
#include <Kernel/Lock.h>
#include <Kernel/SpinLock.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
class ProcessGroup
: public RefCounted<ProcessGroup>
, public Weakable<ProcessGroup>
, public InlineLinkedListNode<ProcessGroup> {
AK_MAKE_NONMOVABLE(ProcessGroup);
AK_MAKE_NONCOPYABLE(ProcessGroup);
friend InlineLinkedListNode<ProcessGroup>;
public:
~ProcessGroup();
static NonnullRefPtr<ProcessGroup> create(ProcessGroupID);
static NonnullRefPtr<ProcessGroup> find_or_create(ProcessGroupID);
static ProcessGroup* from_pgid(ProcessGroupID);
const ProcessGroupID& pgid() const { return m_pgid; }
private:
ProcessGroup(ProcessGroupID pgid)
: m_pgid(pgid)
{
}
ProcessGroup* m_prev { nullptr };
ProcessGroup* m_next { nullptr };
ProcessGroupID m_pgid;
};
extern InlineLinkedList<ProcessGroup>* g_process_groups;
extern RecursiveSpinLock g_process_groups_lock;
}