ConsoleSlave.cc

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
#include "pedigree/kernel/processor/types.h"
#include "pedigree/kernel/utilities/Buffer.h"
#include "pedigree/kernel/utilities/String.h"
 
#include "Console.h"
#include "ConsoleDefines.h"
 
class Filesystem;
 
extern const char defaultControl[MAX_CONTROL_CHAR];
 
ConsoleSlaveFile::ConsoleSlaveFile(size_t consoleNumber, String consoleName, Filesystem* pFs)
    : ConsoleSlaveFile(consoleNumber, consoleName, pFs, nullptr) {}
 
ConsoleSlaveFile::ConsoleSlaveFile(size_t consoleNumber, String consoleName, Filesystem* pFs,
                                   File* pParent)
    : ConsoleFile(consoleNumber, consoleName, pFs, pParent) {}
 
uint64_t ConsoleSlaveFile::readIo(ConsoleIoState& state, uint64_t size, uintptr_t buffer,
                                  bool bCanBlock) {
  uint64_t nBytes = state.input.read(reinterpret_cast<char*>(buffer), size, bCanBlock);
  if (!nBytes) {
    return 0;
  }
 
  dataChanged();
  if (m_pOther) {
    m_pOther->dataChanged();
  }
 
  size_t endSize = processInput(reinterpret_cast<char*>(buffer), nBytes);
 
  return endSize;
}
 
uint64_t ConsoleSlaveFile::writeIo(ConsoleIoState& state, uint64_t size, uintptr_t buffer,
                                   bool bCanBlock) {
  if (!size || !state.output.canWrite(bCanBlock)) {
    return 0;
  }
  // Publish readiness before waiting for a reader to make more room.
  size_t amount = state.output.writeAvailable(reinterpret_cast<char*>(buffer), size);
  changed();
  return amount;
}
 
uint64_t ConsoleSlaveFile::readBytewise(uint64_t, uint64_t size, uintptr_t buffer, bool canBlock) {
  return readEpoch(captureOpenEpoch(), size, buffer, canBlock);
}
 
uint64_t ConsoleSlaveFile::writeBytewise(uint64_t, uint64_t size, uintptr_t buffer, bool canBlock) {
  return writeEpoch(captureOpenEpoch(), size, buffer, canBlock);
}