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
}
}
}
