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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Singleton.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/Sections.h>
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#include <Kernel/TTY/MasterPTY.h>
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#include <Kernel/TTY/PTYMultiplexer.h>
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#include <LibC/errno_numbers.h>
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namespace Kernel {
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static Singleton<PTYMultiplexer> s_the;
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PTYMultiplexer& PTYMultiplexer::the()
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{
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return *s_the;
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}
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UNMAP_AFTER_INIT PTYMultiplexer::PTYMultiplexer()
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: CharacterDevice(5, 2)
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{
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m_freelist.with_exclusive([&](auto& freelist) {
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freelist.ensure_capacity(max_pty_pairs);
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for (int i = max_pty_pairs; i > 0; --i)
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freelist.unchecked_append(i - 1);
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});
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}
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UNMAP_AFTER_INIT PTYMultiplexer::~PTYMultiplexer()
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{
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}
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void PTYMultiplexer::initialize()
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{
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the().after_inserting();
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}
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ErrorOr<NonnullRefPtr<OpenFileDescription>> PTYMultiplexer::open(int options)
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{
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return m_freelist.with_exclusive([&](auto& freelist) -> ErrorOr<NonnullRefPtr<OpenFileDescription>> {
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if (freelist.is_empty())
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return EBUSY;
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auto master_index = freelist.take_last();
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auto master = TRY(MasterPTY::try_create(master_index));
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dbgln_if(PTMX_DEBUG, "PTYMultiplexer::open: Vending master {}", master->index());
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auto description = TRY(OpenFileDescription::try_create(*master));
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description->set_rw_mode(options);
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description->set_file_flags(options);
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return description;
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});
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}
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void PTYMultiplexer::notify_master_destroyed(Badge<MasterPTY>, unsigned index)
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{
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m_freelist.with_exclusive([&](auto& freelist) {
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freelist.append(index);
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dbgln_if(PTMX_DEBUG, "PTYMultiplexer: {} added to freelist", index);
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});
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}
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}
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