/** @inheritDoc */
public int writeBuf(int fd, byte buffer[], int off, int len) throws IOException {
int result = 0;
byte[] buf = buffer;
if (off != 0) {
buf = new byte[len];
System.arraycopy(buffer, off, buf, 0, len);
}
if (DEBUG) {
System.err.println("writeBuf(" + fd + ") before write.");
}
result = libc.write(fd, buf, len); // We rely on open0() for setting the socket to non-blocking
if (result < 0) {
int err_code = LibCUtil.errno();
if (err_code == LibC.EWOULDBLOCK) {
VMThread.getSystemEvents().waitForWriteEvent(fd);
if (DEBUG) {
System.err.println("writeBuf(" + fd + ") returned from select. retry.");
}
result =
libc.write(fd, buf, len); // We rely on open0() for setting the socket to non-blocking
}
if (DEBUG) {
System.err.println("writeBuf(" + fd + ") error:");
}
LibCUtil.errCheckNeg(result);
}
return result;
}
/** @inheritDoc */
public int readBuf(int fd, byte b[], int offset, int length) throws IOException {
byte[] buf = b;
if (offset != 0) {
buf = new byte[length];
}
int result =
libc.read(fd, buf, length); // We rely on open0() for setting the socket to non-blocking
if (result < 0) {
int err_code = LibCUtil.errno();
if (err_code == LibC.EWOULDBLOCK) {
VMThread.getSystemEvents().waitForReadEvent(fd);
result =
libc.read(fd, buf, length); // We rely on open0() for setting the socket to non-blocking
}
LibCUtil.errCheckNeg(result);
}
if (result == 0) {
// If remote side has shut down the connection gracefully, and all
// data has been received, recv() will complete immediately with
// zero bytes received.
//
// This is true for Win32/CE and Linux
result = -1;
}
return result;
}
/** @inheritDoc */
public int available(int fd) throws IOException {
int err = ioctl.ioctl(fd, Ioctl.FIONREAD, availableBuf.address().toUWord().toPrimitive());
int result = availableBuf.getInt(0);
LibCUtil.errCheckNeg(err);
if (DEBUG) {
System.err.println("available(" + fd + ") = " + result);
}
return result;
}
/**
* get a socket option
*
* @param socket socket descriptor
* @param option_name
* @throws IOException on error
*/
public int getSockOpt(int socket, int option_name) throws IOException {
IntByReference value = new IntByReference(0);
IntByReference opt_len = new IntByReference(4);
if (DEBUG) {
System.out.println("getsockopt(" + socket + ", " + option_name + ")");
}
int err = sockets.getsockopt(socket, Socket.SOL_SOCKET, option_name, value, opt_len);
int result = value.getValue();
value.free();
if (false) Assert.that(opt_len.getValue() == 4);
opt_len.free();
LibCUtil.errCheckNeg(err);
return result;
}
/**
* set a socket option
*
* @param socket socket descriptor
* @param option_name
* @param option_value new value
* @throws IOException on error
*/
public void setSockOpt(int socket, int option_name, int option_value) throws IOException {
IntByReference value = new IntByReference(option_value);
int err = sockets.setsockopt(socket, Socket.SOL_SOCKET, option_name, value, 4);
value.free();
LibCUtil.errCheckNeg(err);
}