public synchronized void freopen(Ruby runtime, String path, ModeFlags modes) throws DirectoryAsFileException, IOException, InvalidValueException, PipeException, BadDescriptorException { // flush first flushWrite(); // reset buffer buffer.clear(); if (reading) { buffer.flip(); } this.modes = modes; if (descriptor.isOpen()) { descriptor.close(); } if (path.equals("/dev/null") || path.equalsIgnoreCase("nul:") || path.equalsIgnoreCase("nul")) { descriptor = descriptor.reopen(new NullChannel(), modes); } else { String cwd = runtime.getCurrentDirectory(); JRubyFile theFile = JRubyFile.create(cwd, path); if (theFile.isDirectory() && modes.isWritable()) throw new DirectoryAsFileException(); if (modes.isCreate()) { if (theFile.exists() && modes.isExclusive()) { throw runtime.newErrnoEEXISTError("File exists - " + path); } theFile.createNewFile(); } else { if (!theFile.exists()) { throw runtime.newErrnoENOENTError("file not found - " + path); } } // We always open this rw since we can only open it r or rw. RandomAccessFile file = new RandomAccessFile(theFile, modes.toJavaModeString()); if (modes.isTruncate()) file.setLength(0L); descriptor = descriptor.reopen(file, modes); try { if (modes.isAppendable()) lseek(0, SEEK_END); } catch (PipeException pe) { // ignore, it's a pipe or fifo } } }