filebuf & csdbg::filebuf::open ( u32  flags, u32  umask  )

virtual

Open the file.

Parameters

[in]	flags	the flags used to open the file
[in]	umask	the file mode (ignored if the file exists)

Returns

*this

Exceptions

csdbg::exception

Note

If the file is already open, it is re-opened with the new flags

Definition at line 162 of file filebuf.cpp.

References csdbg::streambuf::close(), csdbg::util::is_regular(), csdbg::util::is_writable(), csdbg::streambuf::m_handle, m_path, open(), and unlikely.

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

  do {
    m_handle = ::open(m_path, flags, umask);
  }
  while ( unlikely(m_handle < 0 && errno == EINTR) );

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

  /* Sanity checks, if a test fails an appropriate exception is thrown */
  try {
    fileinfo_t inf;
    i32 retval = fstat(m_handle, &inf);
    if ( unlikely(retval < 0) )
      throw exception(
        "failed to stat path '%s' (errno %d - %s)",
        m_path,
        errno,
        strerror(errno)
      );

    else if ( unlikely(!util::is_regular(inf)) )
      throw exception("'%s' is not a regular file", m_path);

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

    return *this;
  }

  catch (...) {
    /* If any of the checks failed, the descriptor is unusable */
    close();
    throw;
  }
}

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