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752de9cd27
It's not valid for a FileDescription to not have a file, so let's disallow it by taking a File& (or FIFO&) in the constructor.
53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
#include "PTYMultiplexer.h"
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#include "MasterPTY.h"
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/Process.h>
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#include <LibC/errno_numbers.h>
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//#define PTMX_DEBUG
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static const unsigned s_max_pty_pairs = 8;
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static PTYMultiplexer* s_the;
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PTYMultiplexer& PTYMultiplexer::the()
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{
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ASSERT(s_the);
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return *s_the;
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}
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PTYMultiplexer::PTYMultiplexer()
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: CharacterDevice(5, 2)
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{
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s_the = this;
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m_freelist.ensure_capacity(s_max_pty_pairs);
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for (int i = s_max_pty_pairs; i > 0; --i)
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m_freelist.unchecked_append(i - 1);
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}
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PTYMultiplexer::~PTYMultiplexer()
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{
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}
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KResultOr<NonnullRefPtr<FileDescription>> PTYMultiplexer::open(int options)
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{
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UNUSED_PARAM(options);
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LOCKER(m_lock);
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if (m_freelist.is_empty())
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return KResult(-EBUSY);
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auto master_index = m_freelist.take_last();
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auto master = adopt(*new MasterPTY(master_index));
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#ifdef PTMX_DEBUG
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dbgprintf("PTYMultiplexer::open: Vending master %u\n", master->index());
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#endif
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return FileDescription::create(move(master));
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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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LOCKER(m_lock);
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m_freelist.append(index);
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#ifdef PTMX_DEBUG
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dbgprintf("PTYMultiplexer: %u added to freelist\n", index);
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#endif
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}
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