/** @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;
}
/** Read errno, try to clean up fd, and create exception. */
private IOException newError(int fd, String msg) {
if (DEBUG) {
VM.print(msg);
VM.print(": errno: ");
}
int err_code = LibCUtil.errno();
if (DEBUG) {
VM.print(err_code);
VM.println();
}
sockets.shutdown(fd, 2);
libc.close(fd);
return new IOException(" errno: " + err_code + " on fd: " + fd + " during " + msg);
}
/**
* 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;
}
/** @inheritDoc */
public int open(String hostname, int port, int mode) throws IOException {
// init_sockets(); win32 only
int fd = -1;
fd = sockets.socket(Socket.AF_INET, Socket.SOCK_STREAM, 0);
if (DEBUG) {
System.err.println("Socket.socket() = " + fd);
}
if (fd < 0) {
throw newError(fd, "socket create");
}
set_blocking_flags(fd, /*is_blocking*/ false);
NetDB.hostent phostent;
// hostname is always NUL terminated. See socket/Protocol.java for detail.
phostent = NetDB.INSTANCE.gethostbyname(hostname);
if (phostent == null) {
throw newError(fd, "gethostbyname (herrono = " + NetDB.INSTANCE.h_errno() + ")");
}
Socket.sockaddr_in destination_sin = new Socket.sockaddr_in();
destination_sin.sin_family = Socket.AF_INET;
destination_sin.sin_port = Inet.htons((short) port);
destination_sin.sin_addr = phostent.h_addr_list[0];
if (DEBUG) {
System.err.println("Socket.sockaddr_in: " + destination_sin);
System.err.println("connect: hostname: " + hostname + " port: " + port + " mode: " + mode);
}
if (sockets.connect(fd, destination_sin, destination_sin.size()) < 0) {
int err_code = LibCUtil.errno();
if (err_code == LibC.EINPROGRESS || err_code == LibC.EWOULDBLOCK) {
// When the socket is ready for connect, it becomes *writable*
// (according to BSD socket spec of select())
VMThread.getSystemEvents().waitForWriteEvent(fd);
} else {
throw newError(fd, "connect");
}
}
return fd;
}
/**
* 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);
}