sttybuf & csdbg::sttybuf::open ( bool  ctty )

virtual

Open the serial interface for output.

Parameters

[in]

ctty

true to make the interface the process controlling terminal

Returns

*this

Exceptions

csdbg::exception

Note

If the interface is already open, it is re-opened with the new settings

Definition at line 250 of file sttybuf.cpp.

References csdbg::streambuf::close(), config(), csdbg::util::is_chardev(), csdbg::util::is_writable(), likely, m_devnode, csdbg::streambuf::m_handle, open(), and unlikely.

{
  if ( unlikely(m_handle >= 0) )
    close();

  /* Stat the device node path and make some preliminary checks */
  fileinfo_t inf;
  i32 retval = stat(m_devnode, &inf);
  if ( unlikely(errno == ENOENT) )
    throw exception("device node '%s' does not exist", m_devnode);

  else if ( unlikely(retval < 0) )
    throw exception(
      "failed to stat path '%s' (errno %d - %s)",
      m_devnode,
      errno,
      strerror(errno)
    );

  else if ( unlikely(!util::is_chardev(inf)) )
    throw exception("'%s' is not a character device", m_devnode);

  else if ( unlikely(!util::is_writable(inf)) )
    throw exception("serial interface '%s' is not writable", m_devnode);

  u32 flags = O_WRONLY;
  if ( likely(!ctty) )
    flags |= O_NOCTTY;

  /* Open the device node */
  do {
    m_handle = ::open(m_devnode, flags);
  }
  while ( unlikely(m_handle < 0 && errno == EINTR) );

  if ( unlikely(m_handle < 0) )
    throw exception(
      "failed to open serial interface '%s' (errno %d - %s)",
      m_devnode,
      errno,
      strerror(errno)
    );

  return config();
}

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