hosted/Serial.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 "Serial.h"
#include "pedigree/kernel/utilities/Cord.h"
#include "pedigree/kernel/utilities/StaticString.h"
 
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
 
HostedSerial::HostedSerial() : m_File(-1), m_nFileNumber(0) {}
 
HostedSerial::~HostedSerial() {
  if (m_File >= 0) {
    close(m_File);
    m_File = -1;
  }
}
 
void HostedSerial::setBase(uintptr_t nBaseAddr) {
  m_nFileNumber = nBaseAddr;
  if (m_File >= 0)
    close(m_File);
 
  NormalStaticString s;
  s.clear();
  s.append("serial");
  s.append(m_nFileNumber);
  s.append(".log");
  m_File = open(static_cast<const char*>(s), O_TRUNC | O_CREAT | O_WRONLY, 0644);
}
 
char HostedSerial::read() {
  // Cannot do.
  return '\0';
}
 
bool HostedSerial::hasData() {
  return false;
}
 
char HostedSerial::readNonBlock() {
  return read();
}
 
void HostedSerial::write(char c) {
  char buf[2] = {c, 0};
  ::write(m_File, buf, 1);
  ::fsync(m_File);
  ::write(2, buf, 1);
  ::fsync(2);
}
 
void HostedSerial::write_str(const char* c) {
  ::write(m_File, c, StringLength(c));
  ::fsync(m_File);
  ::write(2, c, StringLength(c));
  ::fsync(2);
}
 
void HostedSerial::write_str(const char* c, size_t len) {
  ::write(m_File, c, len);
  ::fsync(m_File);
  ::write(2, c, len);
  ::fsync(2);
}
 
void HostedSerial::write_str(const Cord& cord) {
  for (auto it = cord.segbegin(); it != cord.segend(); ++it) {
    ::write(m_File, it.ptr(), it.length());
    ::write(2, it.ptr(), it.length());
  }
 
  ::fsync(m_File);
  ::fsync(2);
}
 
bool HostedSerial::isConnected() {
  return m_File >= 0;
}