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25bb293629
Instead of just returning nothing, let's return Error or nothing. This would help later on with error propagation in case of failure during this method. This also makes us more paranoid about failure in this method, so when initializing a DisplayConnector we safely tear down the internal members of the object. This applies the same for a StorageDevice object, but its after_inserting method is much smaller compared to the DisplayConnector overriden method.
65 lines
1.8 KiB
C++
65 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/API/POSIX/errno.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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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([&](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() = default;
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UNMAP_AFTER_INIT void PTYMultiplexer::initialize()
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{
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MUST(the().after_inserting());
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}
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ErrorOr<NonnullLockRefPtr<OpenFileDescription>> PTYMultiplexer::open(int options)
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{
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return m_freelist.with([&](auto& freelist) -> ErrorOr<NonnullLockRefPtr<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([&](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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