mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 16:32:45 +00:00
84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* 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.
|
|
*/
|
|
|
|
#include "PTYMultiplexer.h"
|
|
#include "MasterPTY.h"
|
|
#include <Kernel/FileSystem/FileDescription.h>
|
|
#include <Kernel/Process.h>
|
|
#include <LibC/errno_numbers.h>
|
|
|
|
//#define PTMX_DEBUG
|
|
|
|
namespace Kernel {
|
|
|
|
static const unsigned s_max_pty_pairs = 8;
|
|
static PTYMultiplexer* s_the;
|
|
|
|
PTYMultiplexer& PTYMultiplexer::the()
|
|
{
|
|
ASSERT(s_the);
|
|
return *s_the;
|
|
}
|
|
|
|
PTYMultiplexer::PTYMultiplexer()
|
|
: CharacterDevice(5, 2)
|
|
{
|
|
s_the = this;
|
|
m_freelist.ensure_capacity(s_max_pty_pairs);
|
|
for (int i = s_max_pty_pairs; i > 0; --i)
|
|
m_freelist.unchecked_append(i - 1);
|
|
}
|
|
|
|
PTYMultiplexer::~PTYMultiplexer()
|
|
{
|
|
}
|
|
|
|
KResultOr<NonnullRefPtr<FileDescription>> PTYMultiplexer::open(int options)
|
|
{
|
|
LOCKER(m_lock);
|
|
if (m_freelist.is_empty())
|
|
return KResult(-EBUSY);
|
|
auto master_index = m_freelist.take_last();
|
|
auto master = adopt(*new MasterPTY(master_index));
|
|
#ifdef PTMX_DEBUG
|
|
dbg() << "PTYMultiplexer::open: Vending master " << master->index();
|
|
#endif
|
|
auto description = FileDescription::create(move(master));
|
|
description->set_rw_mode(options);
|
|
description->set_file_flags(options);
|
|
return description;
|
|
}
|
|
|
|
void PTYMultiplexer::notify_master_destroyed(Badge<MasterPTY>, unsigned index)
|
|
{
|
|
LOCKER(m_lock);
|
|
m_freelist.append(index);
|
|
#ifdef PTMX_DEBUG
|
|
dbg() << "PTYMultiplexer: " << index << " added to freelist";
|
|
#endif
|
|
}
|
|
|
|
}
|