9dd29f9aa9
When you open /dev/ptmx, you get a file descriptor pointing to one of the available MasterPTY's. If none are available, you get an EBUSY. This makes it possible to open multiple (up to 4) Terminals. :^) To support this, I also added a CharacterDevice::open() that gets control when VFS is opening a CharacterDevice. This is useful when we want to return a custom FileDescriptor like we do here.
27 lines
681 B
C++
27 lines
681 B
C++
#include "PTYMultiplexer.h"
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#include "MasterPTY.h"
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#include <LibC/errno_numbers.h>
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PTYMultiplexer::PTYMultiplexer()
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: CharacterDevice(5, 2)
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{
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m_freelist.ensureCapacity(4);
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for (int i = 4; i > 0; --i)
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m_freelist.unchecked_append(adopt(*new MasterPTY(i - 1)));
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}
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PTYMultiplexer::~PTYMultiplexer()
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{
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}
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RetainPtr<FileDescriptor> PTYMultiplexer::open(int& error, int options)
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{
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LOCKER(m_lock);
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if (m_freelist.is_empty()) {
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error = -EBUSY;
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return nullptr;
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}
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auto master = m_freelist.takeLast();
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dbgprintf("PTYMultiplexer::open: Vending master %u\n", master->index());
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return VFS::the().open(move(master), error, options);
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}
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