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https://github.com/RGBCube/serenity
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1b2ef8582c
Asking a File if we could possibly read or write it will never mutate the asking FileDescription&, so it should be const.
111 lines
2.6 KiB
C++
111 lines
2.6 KiB
C++
#include "MasterPTY.h"
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#include "PTYMultiplexer.h"
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#include "SlavePTY.h"
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#include <Kernel/Process.h>
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#include <LibC/errno_numbers.h>
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#include <LibC/signal_numbers.h>
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#include <LibC/sys/ioctl_numbers.h>
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//#define MASTERPTY_DEBUG
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MasterPTY::MasterPTY(unsigned index)
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: CharacterDevice(10, index)
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, m_slave(adopt(*new SlavePTY(*this, index)))
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, m_index(index)
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{
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m_pts_name = String::format("/dev/pts/%u", m_index);
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set_uid(current->process().uid());
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set_gid(current->process().gid());
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}
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MasterPTY::~MasterPTY()
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{
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#ifdef MASTERPTY_DEBUG
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dbgprintf("~MasterPTY(%u)\n", m_index);
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#endif
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PTYMultiplexer::the().notify_master_destroyed({}, m_index);
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}
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String MasterPTY::pts_name() const
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{
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return m_pts_name;
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}
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ssize_t MasterPTY::read(FileDescription&, u8* buffer, ssize_t size)
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{
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if (!m_slave && m_buffer.is_empty())
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return 0;
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return m_buffer.read(buffer, size);
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}
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ssize_t MasterPTY::write(FileDescription&, const u8* buffer, ssize_t size)
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{
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if (!m_slave)
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return -EIO;
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m_slave->on_master_write(buffer, size);
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return size;
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}
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bool MasterPTY::can_read(const FileDescription&) const
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{
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if (!m_slave)
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return true;
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return !m_buffer.is_empty();
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}
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bool MasterPTY::can_write(const FileDescription&) const
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{
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return true;
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}
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void MasterPTY::notify_slave_closed(Badge<SlavePTY>)
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{
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#ifdef MASTERPTY_DEBUG
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dbgprintf("MasterPTY(%u): slave closed, my retains: %u, slave retains: %u\n", m_index, ref_count(), m_slave->ref_count());
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#endif
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// +1 ref for my MasterPTY::m_slave
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// +1 ref for FileDescription::m_device
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if (m_slave->ref_count() == 2)
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m_slave = nullptr;
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}
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ssize_t MasterPTY::on_slave_write(const u8* data, ssize_t size)
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{
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if (m_closed)
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return -EIO;
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m_buffer.write(data, size);
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return size;
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}
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bool MasterPTY::can_write_from_slave() const
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{
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if (m_closed)
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return true;
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return m_buffer.bytes_in_write_buffer() < 4096;
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}
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void MasterPTY::close()
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{
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if (ref_count() == 2) {
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InterruptDisabler disabler;
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// After the closing FileDescription dies, slave is the only thing keeping me alive.
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// From this point, let's consider ourselves closed.
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m_closed = true;
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m_slave->hang_up();
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}
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}
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int MasterPTY::ioctl(FileDescription& description, unsigned request, unsigned arg)
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{
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if (!m_slave)
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return -EIO;
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if (request == TIOCSWINSZ || request == TIOCGPGRP)
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return m_slave->ioctl(description, request, arg);
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return -EINVAL;
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}
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String MasterPTY::absolute_path(const FileDescription&) const
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{
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return String::format("ptm:%s", m_pts_name.characters());
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}
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