/**
* Flush the write buffer to the channel (if needed)
*
* @throws IOException
*/
private boolean flushWrite(final boolean block) throws IOException, BadDescriptorException {
if (reading || !modes.isWritable() || buffer.position() == 0) return false; // Don't bother
int len = buffer.position();
int nWritten = 0;
buffer.flip();
// For Sockets, only write as much as will fit.
if (descriptor.getChannel() instanceof SelectableChannel) {
SelectableChannel selectableChannel = (SelectableChannel) descriptor.getChannel();
synchronized (selectableChannel.blockingLock()) {
boolean oldBlocking = selectableChannel.isBlocking();
try {
if (oldBlocking != block) {
selectableChannel.configureBlocking(block);
}
nWritten = descriptor.write(buffer);
} finally {
if (oldBlocking != block) {
selectableChannel.configureBlocking(oldBlocking);
}
}
}
} else {
nWritten = descriptor.write(buffer);
}
if (nWritten != len) {
buffer.compact();
return false;
}
buffer.clear();
return true;
}
private static Stream maybeWrapWithLineEndingWrapper(Stream stream, ModeFlags modes) {
if (Platform.IS_WINDOWS
&& stream.getDescriptor().getChannel() instanceof FileChannel
&& !modes.isBinary()) {
return new CRLFStreamWrapper(stream);
}
return stream;
}
/**
* Flush the write buffer to the channel (if needed)
*
* @throws IOException
*/
private void flushWrite() throws IOException, BadDescriptorException {
if (reading || !modes.isWritable() || buffer.position() == 0) return; // Don't bother
int len = buffer.position();
buffer.flip();
int n = descriptor.write(buffer);
if (n != len) {
// TODO: check the return value here
}
buffer.clear();
}
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
}
}
}
public void checkPermissionsSubsetOf(ModeFlags subsetModes) {
subsetModes.isSubsetOf(modes);
}
public void checkWritable() throws IOException {
if (!modes.isWritable()) throw new IOException("not opened for writing");
}
public void checkReadable() throws IOException {
if (!modes.isReadable()) throw new IOException("not opened for reading");
}