/** @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;
}
/**
* Wakes up a single thread that is waiting on this object's monitor. If any threads are waiting
* on this object, one of them is chosen to be awakened. The choice is arbitrary and occurs at the
* discretion of the implementation. A thread waits on an object's monitor by calling one of the
* <code>wait</code> methods.
*
* <p>The awakened thread will not be able to proceed until the current thread relinquishes the
* lock on this object. The awakened thread will compete in the usual manner with any other
* threads that might be actively competing to synchronize on this object; for example, the
* awakened thread enjoys no reliable privilege or disadvantage in being the next thread to lock
* this object.
*
* <p>This method should only be called by a thread that is the owner of this object's monitor. A
* thread becomes the owner of the object's monitor in one of three ways:
*
* <ul>
* <li>By executing a synchronized instance method of that object.
* <li>By executing the body of a <code>synchronized</code> statement that synchronizes on the
* object.
* <li>For objects of type <code>Class,</code> by executing a synchronized static method of that
* class.
* </ul>
*
* <p>Only one thread at a time can own an object's monitor.
*
* @exception IllegalMonitorStateException if the current thread is not the owner of this object's
* monitor.
* @see java.lang.Object#notifyAll()
* @see java.lang.Object#wait()
*/
public final void notify() {
com.sun.squawk.VMThread.monitorNotify(this, false);
}
/**
* Causes current thread to wait until either another thread invokes the {@link
* java.lang.Object#notify()} method or the {@link java.lang.Object#notifyAll()} method for this
* object, or a specified amount of time has elapsed.
*
* <p>The current thread must own this object's monitor.
*
* <p>This method causes the current thread (call it <var>T</var>) to place itself in the wait set
* for this object and then to relinquish any and all synchronization claims on this object.
* Thread <var>T</var> becomes disabled for thread scheduling purposes and lies dormant until one
* of four things happens:
*
* <ul>
* <li>Some other thread invokes the <tt>notify</tt> method for this object and thread
* <var>T</var> happens to be arbitrarily chosen as the thread to be awakened.
* <li>Some other thread invokes the <tt>notifyAll</tt> method for this object.
* <li>The specified amount of real time has elapsed, more or less. If <tt>timeout</tt> is zero,
* however, then real time is not taken into consideration and the thread simply waits until
* notified.
* </ul>
*
* The thread <var>T</var> is then removed from the wait set for this object and re-enabled for
* thread scheduling. It then competes in the usual manner with other threads for the right to
* synchronize on the object; once it has gained control of the object, all its synchronization
* claims on the object are restored to the status quo ante - that is, to the situation as of the
* time that the <tt>wait</tt> method was invoked. Thread <var>T</var> then returns from the
* invocation of the <tt>wait</tt> method. Thus, on return from the <tt>wait</tt> method, the
* synchronization state of the object and of thread <tt>T</tt> is exactly as it was when the
* <tt>wait</tt> method was invoked.
*
* <p>Note that the <tt>wait</tt> method, as it places the current thread into the wait set for
* this object, unlocks only this object; any other objects on which the current thread may be
* synchronized remain locked while the thread waits.
*
* <p>This method should only be called by a thread that is the owner of this object's monitor.
* See the <code>notify</code> method for a description of the ways in which a thread can become
* the owner of a monitor.
*
* @param timeout the maximum time to wait in milliseconds.
* @exception IllegalArgumentException if the value of timeout is negative.
* @exception IllegalMonitorStateException if the current thread is not the owner of the object's
* monitor.
* @exception InterruptedException if another thread has interrupted the current thread. The
* <i>interrupted status</i> of the current thread is cleared when this exception is thrown.
* @see java.lang.Object#notify()
* @see java.lang.Object#notifyAll()
*/
public final void wait(long timeout) throws InterruptedException {
if (timeout < 0) {
throw new IllegalArgumentException(/*"timeout value is negative"*/ );
}
com.sun.squawk.VMThread.monitorWait(this, timeout);
}
/**
* Wakes up all threads that are waiting on this object's monitor. A thread waits on an object's
* monitor by calling one of the <code>wait</code> methods.
*
* <p>The awakened threads will not be able to proceed until the current thread relinquishes the
* lock on this object. The awakened threads will compete in the usual manner with any other
* threads that might be actively competing to synchronize on this object; for example, the
* awakened threads enjoy no reliable privilege or disadvantage in being the next thread to lock
* this object.
*
* <p>This method should only be called by a thread that is the owner of this object's monitor.
* See the <code>notify</code> method for a description of the ways in which a thread can become
* the owner of a monitor.
*
* @exception IllegalMonitorStateException if the current thread is not the owner of this object's
* monitor.
* @see java.lang.Object#notify()
* @see java.lang.Object#wait()
*/
public final void notifyAll() {
com.sun.squawk.VMThread.monitorNotify(this, true);
}
/** @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;
}
