/** @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;
}
/**
* Accept client connections on server socket fd. Blocks until a client connects.
*
* @param fd open server socket. See {@link #openServer}.
* @return a native handle to the network connection.
* @throws IOException
*/
public int accept(int fd) throws IOException {
VMThread.getSystemEvents().waitForReadEvent(fd);
Socket.sockaddr_in remote_sin = new Socket.sockaddr_in();
IntByReference address_len = new IntByReference(4);
int newSocket = sockets.accept(fd, remote_sin, address_len);
if (newSocket < 0) {
throw newError(fd, "accept");
}
address_len.free();
set_blocking_flags(newSocket, /*is_blocking*/ false);
// we could read info about client from remote_sin, but don't need to.
return newSocket;
}
/** @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;
}
/**
* Accept client connections on server socket fd. Blocks until a client connects.
*
* @param fd open server socket. See {@link #openServer}.
* @return a native handle to the network connection.
* @throws IOException
*/
public int accept(int fd) throws IOException {
Socket.sockaddr_in remote_sin = new Socket.sockaddr_in();
IntByReference address_len = new IntByReference(4);
int newSocket;
try {
if (DEBUG) {
System.err.println("Socket.accept(" + fd + ", " + remote_sin + ")...");
}
newSocket = sockets.accept(fd, remote_sin, address_len);
if (newSocket < 0) {
if (DEBUG) {
System.err.println("Need to block for accept...");
}
int err_code = LibCUtil.errno();
if (err_code == LibC.EAGAIN || err_code == LibC.EWOULDBLOCK) {
VMThread.getSystemEvents().waitForReadEvent(fd);
newSocket = sockets.accept(fd, remote_sin, address_len);
if (newSocket < 0) {
throw newError(fd, "accept");
}
} else {
// BUG!
throw newError(fd, "accept");
}
}
} finally {
address_len.free();
}
set_blocking_flags(newSocket, /*is_blocking*/ false);
// we could read info about client from remote_sin, but don't need to.
if (DEBUG) {
System.err.println(" Socket.accept(...) = " + newSocket);
}
return newSocket;
}
/** @inheritDoc */
public int readBuf(int fd, byte b[], int offset, int length) throws IOException {
byte[] buf = b;
int result;
if (offset != 0) {
if (DEBUG) {
System.err.println("readBuf() into temp buf");
}
buf = new byte[length];
}
if (NBIO_WORKS) {
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) {
if (DEBUG) {
System.err.println("Wait for read in select...");
}
VMThread.getSystemEvents().waitForReadEvent(fd);
result =
libc.read(
fd, buf, length); // We rely on open0() for setting the socket to non-blocking
}
LibCUtil.errCheckNeg(result);
}
} else {
// If non-blocking IO doesn't seems to be working, try this hack...
int bAvail = available(fd); // may throw IOException
if (bAvail == 0) {
if (DEBUG) {
System.err.println("Wait for read in select...");
}
VMThread.getSystemEvents().waitForReadEvent(fd);
bAvail = available(fd);
if (bAvail == 0) { // woke up because connection is closed
if (DEBUG) {
System.err.println("readBuf(" + fd + ") signalling EOF.");
}
return -1; // signal EOF
}
}
if (DEBUG) {
System.err.println("readBuf(" + fd + ") returned from select. retry.");
}
int n = Math.min(bAvail, length); // don't read more than is asked for...
result = libc.read(fd, buf, n); // only read what we know is there...
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
if (DEBUG) {
System.err.println("readBuf(" + fd + ") saw remote side shutdown.");
}
result = -1;
}
if (offset != 0 && result > 0) {
System.arraycopy(buf, 0, b, offset, result);
}
if (DEBUG) {
System.out.println("readBuf(" + fd + ") = " + result);
}
return result;
}