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8187443: Forest Consolidation: Move files to unified layout

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Reviewed-by: darcy, ihse
This commit is contained in:
Erik Joelsson 2017-09-12 19:03:39 +02:00
parent 270fe13182
commit 3789983e89
56923 changed files with 3 additions and 15727 deletions
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47
src/java.base/linux/classes/sun/nio/ch/DefaultAsynchronousChannelProvider.java Normal file
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/*
* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.nio.channels.spi.AsynchronousChannelProvider;
/**
* Creates this platform's default AsynchronousChannelProvider
*/
public class DefaultAsynchronousChannelProvider {
/**
* Prevent instantiation.
*/
private DefaultAsynchronousChannelProvider() { }
/**
* Returns the default AsynchronousChannelProvider.
*/
public static AsynchronousChannelProvider create() {
return new LinuxAsynchronousChannelProvider();
}
}

47
src/java.base/linux/classes/sun/nio/ch/DefaultSelectorProvider.java Normal file
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/*
* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.nio.channels.spi.SelectorProvider;
/**
* Creates this platform's default SelectorProvider
*/
public class DefaultSelectorProvider {
/**
* Prevent instantiation.
*/
private DefaultSelectorProvider() { }
/**
* Returns the default SelectorProvider.
*/
public static SelectorProvider create() {
return new EPollSelectorProvider();
}
}

118
src/java.base/linux/classes/sun/nio/ch/EPoll.java Normal file
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/*
* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.io.IOException;
import jdk.internal.misc.Unsafe;
/**
* Provides access to the Linux epoll facility.
*/
class EPoll {
private EPoll() { }
private static final Unsafe unsafe = Unsafe.getUnsafe();
/**
* typedef union epoll_data {
* void *ptr;
* int fd;
* __uint32_t u32;
* __uint64_t u64;
* } epoll_data_t;
*
* struct epoll_event {
* __uint32_t events;
* epoll_data_t data;
* }
*/
private static final int SIZEOF_EPOLLEVENT = eventSize();
private static final int OFFSETOF_EVENTS = eventsOffset();
private static final int OFFSETOF_FD = dataOffset();
// opcodes
static final int EPOLL_CTL_ADD = 1;
static final int EPOLL_CTL_DEL = 2;
static final int EPOLL_CTL_MOD = 3;
// flags
static final int EPOLLONESHOT = (1 << 30);
/**
* Allocates a poll array to handle up to {@code count} events.
*/
static long allocatePollArray(int count) {
return unsafe.allocateMemory(count * SIZEOF_EPOLLEVENT);
}
/**
* Free a poll array
*/
static void freePollArray(long address) {
unsafe.freeMemory(address);
}
/**
* Returns event[i];
*/
static long getEvent(long address, int i) {
return address + (SIZEOF_EPOLLEVENT*i);
}
/**
* Returns event->data.fd
*/
static int getDescriptor(long eventAddress) {
return unsafe.getInt(eventAddress + OFFSETOF_FD);
}
/**
* Returns event->events
*/
static int getEvents(long eventAddress) {
return unsafe.getInt(eventAddress + OFFSETOF_EVENTS);
}
// -- Native methods --
private static native int eventSize();
private static native int eventsOffset();
private static native int dataOffset();
static native int epollCreate() throws IOException;
static native int epollCtl(int epfd, int opcode, int fd, int events);
static native int epollWait(int epfd, long pollAddress, int numfds)
throws IOException;
static {
IOUtil.load();
}
}

341
src/java.base/linux/classes/sun/nio/ch/EPollArrayWrapper.java Normal file
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/*
* Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.io.IOException;
import java.security.AccessController;
import java.util.BitSet;
import java.util.HashMap;
import java.util.Map;
import sun.security.action.GetIntegerAction;
/**
* Manipulates a native array of epoll_event structs on Linux:
*
* typedef union epoll_data {
* void *ptr;
* int fd;
* __uint32_t u32;
* __uint64_t u64;
* } epoll_data_t;
*
* struct epoll_event {
* __uint32_t events;
* epoll_data_t data;
* };
*
* The system call to wait for I/O events is epoll_wait(2). It populates an
* array of epoll_event structures that are passed to the call. The data
* member of the epoll_event structure contains the same data as was set
* when the file descriptor was registered to epoll via epoll_ctl(2). In
* this implementation we set data.fd to be the file descriptor that we
* register. That way, we have the file descriptor available when we
* process the events.
*/
class EPollArrayWrapper {
// EPOLL_EVENTS
private static final int EPOLLIN = 0x001;
// opcodes
private static final int EPOLL_CTL_ADD = 1;
private static final int EPOLL_CTL_DEL = 2;
private static final int EPOLL_CTL_MOD = 3;
// Miscellaneous constants
private static final int SIZE_EPOLLEVENT = sizeofEPollEvent();
private static final int EVENT_OFFSET = 0;
private static final int DATA_OFFSET = offsetofData();
private static final int FD_OFFSET = DATA_OFFSET;
private static final int OPEN_MAX = IOUtil.fdLimit();
private static final int NUM_EPOLLEVENTS = Math.min(OPEN_MAX, 8192);
// Special value to indicate that an update should be ignored
private static final byte KILLED = (byte)-1;
// Initial size of arrays for fd registration changes
private static final int INITIAL_PENDING_UPDATE_SIZE = 64;
// maximum size of updatesLow
private static final int MAX_UPDATE_ARRAY_SIZE = AccessController.doPrivileged(
new GetIntegerAction("sun.nio.ch.maxUpdateArraySize", Math.min(OPEN_MAX, 64*1024)));
// The fd of the epoll driver
private final int epfd;
// The epoll_event array for results from epoll_wait
private final AllocatedNativeObject pollArray;
// Base address of the epoll_event array
private final long pollArrayAddress;
// The fd of the interrupt line going out
private int outgoingInterruptFD;
// The fd of the interrupt line coming in
private int incomingInterruptFD;
// The index of the interrupt FD
private int interruptedIndex;
// Number of updated pollfd entries
int updated;
// object to synchronize fd registration changes
private final Object updateLock = new Object();
// number of file descriptors with registration changes pending
private int updateCount;
// file descriptors with registration changes pending
private int[] updateDescriptors = new int[INITIAL_PENDING_UPDATE_SIZE];
// events for file descriptors with registration changes pending, indexed
// by file descriptor and stored as bytes for efficiency reasons. For
// file descriptors higher than MAX_UPDATE_ARRAY_SIZE (unlimited case at
// least) then the update is stored in a map.
private final byte[] eventsLow = new byte[MAX_UPDATE_ARRAY_SIZE];
private final Map<Integer,Byte> eventsHigh = new HashMap<>();
// Used by release and updateRegistrations to track whether a file
// descriptor is registered with epoll.
private final BitSet registered = new BitSet();
EPollArrayWrapper() throws IOException {
// creates the epoll file descriptor
epfd = epollCreate();
// the epoll_event array passed to epoll_wait
int allocationSize = NUM_EPOLLEVENTS * SIZE_EPOLLEVENT;
pollArray = new AllocatedNativeObject(allocationSize, true);
pollArrayAddress = pollArray.address();
}
void initInterrupt(int fd0, int fd1) {
outgoingInterruptFD = fd1;
incomingInterruptFD = fd0;
epollCtl(epfd, EPOLL_CTL_ADD, fd0, EPOLLIN);
}
void putEventOps(int i, int event) {
int offset = SIZE_EPOLLEVENT * i + EVENT_OFFSET;
pollArray.putInt(offset, event);
}
void putDescriptor(int i, int fd) {
int offset = SIZE_EPOLLEVENT * i + FD_OFFSET;
pollArray.putInt(offset, fd);
}
int getEventOps(int i) {
int offset = SIZE_EPOLLEVENT * i + EVENT_OFFSET;
return pollArray.getInt(offset);
}
int getDescriptor(int i) {
int offset = SIZE_EPOLLEVENT * i + FD_OFFSET;
return pollArray.getInt(offset);
}
/**
* Returns {@code true} if updates for the given key (file
* descriptor) are killed.
*/
private boolean isEventsHighKilled(Integer key) {
assert key >= MAX_UPDATE_ARRAY_SIZE;
Byte value = eventsHigh.get(key);
return (value != null && value == KILLED);
}
/**
* Sets the pending update events for the given file descriptor. This
* method has no effect if the update events is already set to KILLED,
* unless {@code force} is {@code true}.
*/
private void setUpdateEvents(int fd, byte events, boolean force) {
if (fd < MAX_UPDATE_ARRAY_SIZE) {
if ((eventsLow[fd] != KILLED) || force) {
eventsLow[fd] = events;
}
} else {
Integer key = Integer.valueOf(fd);
if (!isEventsHighKilled(key) || force) {
eventsHigh.put(key, Byte.valueOf(events));
}
}
}
/**
* Returns the pending update events for the given file descriptor.
*/
private byte getUpdateEvents(int fd) {
if (fd < MAX_UPDATE_ARRAY_SIZE) {
return eventsLow[fd];
} else {
Byte result = eventsHigh.get(Integer.valueOf(fd));
// result should never be null
return result.byteValue();
}
}
/**
* Update the events for a given file descriptor
*/
void setInterest(int fd, int mask) {
synchronized (updateLock) {
// record the file descriptor and events
int oldCapacity = updateDescriptors.length;
if (updateCount == oldCapacity) {
int newCapacity = oldCapacity + INITIAL_PENDING_UPDATE_SIZE;
int[] newDescriptors = new int[newCapacity];
System.arraycopy(updateDescriptors, 0, newDescriptors, 0, oldCapacity);
updateDescriptors = newDescriptors;
}
updateDescriptors[updateCount++] = fd;
// events are stored as bytes for efficiency reasons
byte b = (byte)mask;
assert (b == mask) && (b != KILLED);
setUpdateEvents(fd, b, false);
}
}
/**
* Add a file descriptor
*/
void add(int fd) {
// force the initial update events to 0 as it may be KILLED by a
// previous registration.
synchronized (updateLock) {
assert !registered.get(fd);
setUpdateEvents(fd, (byte)0, true);
}
}
/**
* Remove a file descriptor
*/
void remove(int fd) {
synchronized (updateLock) {
// kill pending and future update for this file descriptor
setUpdateEvents(fd, KILLED, false);
// remove from epoll
if (registered.get(fd)) {
epollCtl(epfd, EPOLL_CTL_DEL, fd, 0);
registered.clear(fd);
}
}
}
/**
* Close epoll file descriptor and free poll array
*/
void closeEPollFD() throws IOException {
FileDispatcherImpl.closeIntFD(epfd);
pollArray.free();
}
int poll(long timeout) throws IOException {
updateRegistrations();
updated = epollWait(pollArrayAddress, NUM_EPOLLEVENTS, timeout, epfd);
for (int i=0; i<updated; i++) {
if (getDescriptor(i) == incomingInterruptFD) {
interruptedIndex = i;
interrupted = true;
break;
}
}
return updated;
}
/**
* Update the pending registrations.
*/
private void updateRegistrations() {
synchronized (updateLock) {
int j = 0;
while (j < updateCount) {
int fd = updateDescriptors[j];
short events = getUpdateEvents(fd);
boolean isRegistered = registered.get(fd);
int opcode = 0;
if (events != KILLED) {
if (isRegistered) {
opcode = (events != 0) ? EPOLL_CTL_MOD : EPOLL_CTL_DEL;
} else {
opcode = (events != 0) ? EPOLL_CTL_ADD : 0;
}
if (opcode != 0) {
epollCtl(epfd, opcode, fd, events);
if (opcode == EPOLL_CTL_ADD) {
registered.set(fd);
} else if (opcode == EPOLL_CTL_DEL) {
registered.clear(fd);
}
}
}
j++;
}
updateCount = 0;
}
}
// interrupt support
private boolean interrupted = false;
public void interrupt() {
interrupt(outgoingInterruptFD);
}
public int interruptedIndex() {
return interruptedIndex;
}
boolean interrupted() {
return interrupted;
}
void clearInterrupted() {
interrupted = false;
}
static {
IOUtil.load();
init();
}
private native int epollCreate();
private native void epollCtl(int epfd, int opcode, int fd, int events);
private native int epollWait(long pollAddress, int numfds, long timeout,
int epfd) throws IOException;
private static native int sizeofEPollEvent();
private static native int offsetofData();
private static native void interrupt(int fd);
private static native void init();
}

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src/java.base/linux/classes/sun/nio/ch/EPollPort.java Normal file
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/*
* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.nio.channels.spi.AsynchronousChannelProvider;
import java.io.IOException;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.atomic.AtomicInteger;
import static sun.nio.ch.EPoll.*;
/**
* AsynchronousChannelGroup implementation based on the Linux epoll facility.
*/
final class EPollPort
extends Port
{
// maximum number of events to poll at a time
private static final int MAX_EPOLL_EVENTS = 512;
// errors
private static final int ENOENT = 2;
// epoll file descriptor
private final int epfd;
// true if epoll closed
private boolean closed;
// socket pair used for wakeup
private final int sp[];
// number of wakeups pending
private final AtomicInteger wakeupCount = new AtomicInteger();
// address of the poll array passed to epoll_wait
private final long address;
// encapsulates an event for a channel
static class Event {
final PollableChannel channel;
final int events;
Event(PollableChannel channel, int events) {
this.channel = channel;
this.events = events;
}
PollableChannel channel() { return channel; }
int events() { return events; }
}
// queue of events for cases that a polling thread dequeues more than one
// event
private final ArrayBlockingQueue<Event> queue;
private final Event NEED_TO_POLL = new Event(null, 0);
private final Event EXECUTE_TASK_OR_SHUTDOWN = new Event(null, 0);
EPollPort(AsynchronousChannelProvider provider, ThreadPool pool)
throws IOException
{
super(provider, pool);
// open epoll
this.epfd = epollCreate();
// create socket pair for wakeup mechanism
int[] sv = new int[2];
try {
socketpair(sv);
// register one end with epoll
epollCtl(epfd, EPOLL_CTL_ADD, sv[0], Net.POLLIN);
} catch (IOException x) {
close0(epfd);
throw x;
}
this.sp = sv;
// allocate the poll array
this.address = allocatePollArray(MAX_EPOLL_EVENTS);
// create the queue and offer the special event to ensure that the first
// threads polls
this.queue = new ArrayBlockingQueue<>(MAX_EPOLL_EVENTS);
this.queue.offer(NEED_TO_POLL);
}
EPollPort start() {
startThreads(new EventHandlerTask());
return this;
}
/**
* Release all resources
*/
private void implClose() {
synchronized (this) {
if (closed)
return;
closed = true;
}
freePollArray(address);
close0(sp[0]);
close0(sp[1]);
close0(epfd);
}
private void wakeup() {
if (wakeupCount.incrementAndGet() == 1) {
// write byte to socketpair to force wakeup
try {
interrupt(sp[1]);
} catch (IOException x) {
throw new AssertionError(x);
}
}
}
@Override
void executeOnHandlerTask(Runnable task) {
synchronized (this) {
if (closed)
throw new RejectedExecutionException();
offerTask(task);
wakeup();
}
}
@Override
void shutdownHandlerTasks() {
/*
* If no tasks are running then just release resources; otherwise
* write to the one end of the socketpair to wakeup any polling threads.
*/
int nThreads = threadCount();
if (nThreads == 0) {
implClose();
} else {
// send interrupt to each thread
while (nThreads-- > 0) {
wakeup();
}
}
}
// invoke by clients to register a file descriptor
@Override
void startPoll(int fd, int events) {
// update events (or add to epoll on first usage)
int err = epollCtl(epfd, EPOLL_CTL_MOD, fd, (events | EPOLLONESHOT));
if (err == ENOENT)
err = epollCtl(epfd, EPOLL_CTL_ADD, fd, (events | EPOLLONESHOT));
if (err != 0)
throw new AssertionError(); // should not happen
}
/*
* Task to process events from epoll and dispatch to the channel's
* onEvent handler.
*
* Events are retreived from epoll in batch and offered to a BlockingQueue
* where they are consumed by handler threads. A special "NEED_TO_POLL"
* event is used to signal one consumer to re-poll when all events have
* been consumed.
*/
private class EventHandlerTask implements Runnable {
private Event poll() throws IOException {
try {
for (;;) {
int n = epollWait(epfd, address, MAX_EPOLL_EVENTS);
/*
* 'n' events have been read. Here we map them to their
* corresponding channel in batch and queue n-1 so that
* they can be handled by other handler threads. The last
* event is handled by this thread (and so is not queued).
*/
fdToChannelLock.readLock().lock();
try {
while (n-- > 0) {
long eventAddress = getEvent(address, n);
int fd = getDescriptor(eventAddress);
// wakeup
if (fd == sp[0]) {
if (wakeupCount.decrementAndGet() == 0) {
// no more wakeups so drain pipe
drain1(sp[0]);
}
// queue special event if there are more events
// to handle.
if (n > 0) {
queue.offer(EXECUTE_TASK_OR_SHUTDOWN);
continue;
}
return EXECUTE_TASK_OR_SHUTDOWN;
}
PollableChannel channel = fdToChannel.get(fd);
if (channel != null) {
int events = getEvents(eventAddress);
Event ev = new Event(channel, events);
// n-1 events are queued; This thread handles
// the last one except for the wakeup
if (n > 0) {
queue.offer(ev);
} else {
return ev;
}
}
}
} finally {
fdToChannelLock.readLock().unlock();
}
}
} finally {
// to ensure that some thread will poll when all events have
// been consumed
queue.offer(NEED_TO_POLL);
}
}
public void run() {
Invoker.GroupAndInvokeCount myGroupAndInvokeCount =
Invoker.getGroupAndInvokeCount();
final boolean isPooledThread = (myGroupAndInvokeCount != null);
boolean replaceMe = false;
Event ev;
try {
for (;;) {
// reset invoke count
if (isPooledThread)
myGroupAndInvokeCount.resetInvokeCount();
try {
replaceMe = false;
ev = queue.take();
// no events and this thread has been "selected" to
// poll for more.
if (ev == NEED_TO_POLL) {
try {
ev = poll();
} catch (IOException x) {
x.printStackTrace();
return;
}
}
} catch (InterruptedException x) {
continue;
}
// handle wakeup to execute task or shutdown
if (ev == EXECUTE_TASK_OR_SHUTDOWN) {
Runnable task = pollTask();
if (task == null) {
// shutdown request
return;
}
// run task (may throw error/exception)
replaceMe = true;
task.run();
continue;
}
// process event
try {
ev.channel().onEvent(ev.events(), isPooledThread);
} catch (Error x) {
replaceMe = true; throw x;
} catch (RuntimeException x) {
replaceMe = true; throw x;
}
}
} finally {
// last handler to exit when shutdown releases resources
int remaining = threadExit(this, replaceMe);
if (remaining == 0 && isShutdown()) {
implClose();
}
}
}
}
// -- Native methods --
private static native void socketpair(int[] sv) throws IOException;
private static native void interrupt(int fd) throws IOException;
private static native void drain1(int fd) throws IOException;
private static native void close0(int fd);
static {
IOUtil.load();
}
}

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src/java.base/linux/classes/sun/nio/ch/EPollSelectorImpl.java Normal file
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/*
* Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.io.IOException;
import java.nio.channels.*;
import java.nio.channels.spi.*;
import java.util.*;
/**
* An implementation of Selector for Linux 2.6+ kernels that uses
* the epoll event notification facility.
*/
class EPollSelectorImpl
extends SelectorImpl
{
// File descriptors used for interrupt
protected int fd0;
protected int fd1;
// The poll object
EPollArrayWrapper pollWrapper;
// Maps from file descriptors to keys
private Map<Integer,SelectionKeyImpl> fdToKey;
// True if this Selector has been closed
private volatile boolean closed;
// Lock for interrupt triggering and clearing
private final Object interruptLock = new Object();
private boolean interruptTriggered = false;
/**
* Package private constructor called by factory method in
* the abstract superclass Selector.
*/
EPollSelectorImpl(SelectorProvider sp) throws IOException {
super(sp);
long pipeFds = IOUtil.makePipe(false);
fd0 = (int) (pipeFds >>> 32);
fd1 = (int) pipeFds;
try {
pollWrapper = new EPollArrayWrapper();
pollWrapper.initInterrupt(fd0, fd1);
fdToKey = new HashMap<>();
} catch (Throwable t) {
try {
FileDispatcherImpl.closeIntFD(fd0);
} catch (IOException ioe0) {
t.addSuppressed(ioe0);
}
try {
FileDispatcherImpl.closeIntFD(fd1);
} catch (IOException ioe1) {
t.addSuppressed(ioe1);
}
throw t;
}
}
protected int doSelect(long timeout) throws IOException {
if (closed)
throw new ClosedSelectorException();
processDeregisterQueue();
try {
begin();
pollWrapper.poll(timeout);
} finally {
end();
}
processDeregisterQueue();
int numKeysUpdated = updateSelectedKeys();
if (pollWrapper.interrupted()) {
// Clear the wakeup pipe
pollWrapper.putEventOps(pollWrapper.interruptedIndex(), 0);
synchronized (interruptLock) {
pollWrapper.clearInterrupted();
IOUtil.drain(fd0);
interruptTriggered = false;
}
}
return numKeysUpdated;
}
/**
* Update the keys whose fd's have been selected by the epoll.
* Add the ready keys to the ready queue.
*/
private int updateSelectedKeys() {
int entries = pollWrapper.updated;
int numKeysUpdated = 0;
for (int i=0; i<entries; i++) {
int nextFD = pollWrapper.getDescriptor(i);
SelectionKeyImpl ski = fdToKey.get(Integer.valueOf(nextFD));
// ski is null in the case of an interrupt
if (ski != null) {
int rOps = pollWrapper.getEventOps(i);
if (selectedKeys.contains(ski)) {
if (ski.channel.translateAndSetReadyOps(rOps, ski)) {
numKeysUpdated++;
}
} else {
ski.channel.translateAndSetReadyOps(rOps, ski);
if ((ski.nioReadyOps() & ski.nioInterestOps()) != 0) {
selectedKeys.add(ski);
numKeysUpdated++;
}
}
}
}
return numKeysUpdated;
}
protected void implClose() throws IOException {
if (closed)
return;
closed = true;
// prevent further wakeup
synchronized (interruptLock) {
interruptTriggered = true;
}
FileDispatcherImpl.closeIntFD(fd0);
FileDispatcherImpl.closeIntFD(fd1);
pollWrapper.closeEPollFD();
// it is possible
selectedKeys = null;
// Deregister channels
Iterator<SelectionKey> i = keys.iterator();
while (i.hasNext()) {
SelectionKeyImpl ski = (SelectionKeyImpl)i.next();
deregister(ski);
SelectableChannel selch = ski.channel();
if (!selch.isOpen() && !selch.isRegistered())
((SelChImpl)selch).kill();
i.remove();
}
fd0 = -1;
fd1 = -1;
}
protected void implRegister(SelectionKeyImpl ski) {
if (closed)
throw new ClosedSelectorException();
SelChImpl ch = ski.channel;
int fd = Integer.valueOf(ch.getFDVal());
fdToKey.put(fd, ski);
pollWrapper.add(fd);
keys.add(ski);
}
protected void implDereg(SelectionKeyImpl ski) throws IOException {
assert (ski.getIndex() >= 0);
SelChImpl ch = ski.channel;
int fd = ch.getFDVal();
fdToKey.remove(Integer.valueOf(fd));
pollWrapper.remove(fd);
ski.setIndex(-1);
keys.remove(ski);
selectedKeys.remove(ski);
deregister((AbstractSelectionKey)ski);
SelectableChannel selch = ski.channel();
if (!selch.isOpen() && !selch.isRegistered())
((SelChImpl)selch).kill();
}
public void putEventOps(SelectionKeyImpl ski, int ops) {
if (closed)
throw new ClosedSelectorException();
SelChImpl ch = ski.channel;
pollWrapper.setInterest(ch.getFDVal(), ops);
}
public Selector wakeup() {
synchronized (interruptLock) {
if (!interruptTriggered) {
pollWrapper.interrupt();
interruptTriggered = true;
}
}
return this;
}
}

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/*
* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.io.IOException;
import java.nio.channels.*;
import java.nio.channels.spi.*;
public class EPollSelectorProvider
extends SelectorProviderImpl
{
public AbstractSelector openSelector() throws IOException {
return new EPollSelectorImpl(this);
}
public Channel inheritedChannel() throws IOException {
return InheritedChannel.getChannel();
}
}

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/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.ch;
import java.nio.channels.*;
import java.nio.channels.spi.AsynchronousChannelProvider;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ThreadFactory;
import java.io.IOException;
public class LinuxAsynchronousChannelProvider
extends AsynchronousChannelProvider
{
private static volatile EPollPort defaultPort;
private EPollPort defaultEventPort() throws IOException {
if (defaultPort == null) {
synchronized (LinuxAsynchronousChannelProvider.class) {
if (defaultPort == null) {
defaultPort = new EPollPort(this, ThreadPool.getDefault()).start();
}
}
}
return defaultPort;
}
public LinuxAsynchronousChannelProvider() {
}
@Override
public AsynchronousChannelGroup openAsynchronousChannelGroup(int nThreads, ThreadFactory factory)
throws IOException
{
return new EPollPort(this, ThreadPool.create(nThreads, factory)).start();
}
@Override
public AsynchronousChannelGroup openAsynchronousChannelGroup(ExecutorService executor, int initialSize)
throws IOException
{
return new EPollPort(this, ThreadPool.wrap(executor, initialSize)).start();
}
private Port toPort(AsynchronousChannelGroup group) throws IOException {
if (group == null) {
return defaultEventPort();
} else {
if (!(group instanceof EPollPort))
throw new IllegalChannelGroupException();
return (Port)group;
}
}
@Override
public AsynchronousServerSocketChannel openAsynchronousServerSocketChannel(AsynchronousChannelGroup group)
throws IOException
{
return new UnixAsynchronousServerSocketChannelImpl(toPort(group));
}
@Override
public AsynchronousSocketChannel openAsynchronousSocketChannel(AsynchronousChannelGroup group)
throws IOException
{
return new UnixAsynchronousSocketChannelImpl(toPort(group));
}
}

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/*
* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.fs;
import java.nio.file.spi.FileSystemProvider;
/**
* Creates this platform's default FileSystemProvider.
*/
public class DefaultFileSystemProvider {
private DefaultFileSystemProvider() { }
/**
* Returns the default FileSystemProvider.
*/
public static FileSystemProvider create() {
return new LinuxFileSystemProvider();
}
}

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/*
* Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.fs;
import java.nio.file.attribute.*;
import java.util.Map;
import java.util.Set;
import java.io.IOException;
import jdk.internal.misc.Unsafe;
import static sun.nio.fs.UnixNativeDispatcher.*;
import static sun.nio.fs.UnixConstants.*;
/**
* Linux implementation of DosFileAttributeView for use on file systems such
* as ext3 that have extended attributes enabled and SAMBA configured to store
* DOS attributes.
*/
class LinuxDosFileAttributeView
extends UnixFileAttributeViews.Basic implements DosFileAttributeView
{
private static final Unsafe unsafe = Unsafe.getUnsafe();
private static final String READONLY_NAME = "readonly";
private static final String ARCHIVE_NAME = "archive";
private static final String SYSTEM_NAME = "system";
private static final String HIDDEN_NAME = "hidden";
private static final String DOS_XATTR_NAME = "user.DOSATTRIB";
private static final byte[] DOS_XATTR_NAME_AS_BYTES = Util.toBytes(DOS_XATTR_NAME);
private static final int DOS_XATTR_READONLY = 0x01;
private static final int DOS_XATTR_HIDDEN = 0x02;
private static final int DOS_XATTR_SYSTEM = 0x04;
private static final int DOS_XATTR_ARCHIVE = 0x20;
// the names of the DOS attributes (includes basic)
private static final Set<String> dosAttributeNames =
Util.newSet(basicAttributeNames, READONLY_NAME, ARCHIVE_NAME, SYSTEM_NAME, HIDDEN_NAME);
LinuxDosFileAttributeView(UnixPath file, boolean followLinks) {
super(file, followLinks);
}
@Override
public String name() {
return "dos";
}
@Override
public void setAttribute(String attribute, Object value)
throws IOException
{
if (attribute.equals(READONLY_NAME)) {
setReadOnly((Boolean)value);
return;
}
if (attribute.equals(ARCHIVE_NAME)) {
setArchive((Boolean)value);
return;
}
if (attribute.equals(SYSTEM_NAME)) {
setSystem((Boolean)value);
return;
}
if (attribute.equals(HIDDEN_NAME)) {
setHidden((Boolean)value);
return;
}
super.setAttribute(attribute, value);
}
@Override
public Map<String,Object> readAttributes(String[] attributes)
throws IOException
{
AttributesBuilder builder =
AttributesBuilder.create(dosAttributeNames, attributes);
DosFileAttributes attrs = readAttributes();
addRequestedBasicAttributes(attrs, builder);
if (builder.match(READONLY_NAME))
builder.add(READONLY_NAME, attrs.isReadOnly());
if (builder.match(ARCHIVE_NAME))
builder.add(ARCHIVE_NAME, attrs.isArchive());
if (builder.match(SYSTEM_NAME))
builder.add(SYSTEM_NAME, attrs.isSystem());
if (builder.match(HIDDEN_NAME))
builder.add(HIDDEN_NAME, attrs.isHidden());
return builder.unmodifiableMap();
}
@Override
public DosFileAttributes readAttributes() throws IOException {
file.checkRead();
int fd = -1;
try {
fd = file.openForAttributeAccess(followLinks);
final UnixFileAttributes attrs = UnixFileAttributes.get(fd);
final int dosAttribute = getDosAttribute(fd);
return new DosFileAttributes() {
@Override
public FileTime lastModifiedTime() {
return attrs.lastModifiedTime();
}
@Override
public FileTime lastAccessTime() {
return attrs.lastAccessTime();
}
@Override
public FileTime creationTime() {
return attrs.creationTime();
}
@Override
public boolean isRegularFile() {
return attrs.isRegularFile();
}
@Override
public boolean isDirectory() {
return attrs.isDirectory();
}
@Override
public boolean isSymbolicLink() {
return attrs.isSymbolicLink();
}
@Override
public boolean isOther() {
return attrs.isOther();
}
@Override
public long size() {
return attrs.size();
}
@Override
public Object fileKey() {
return attrs.fileKey();
}
@Override
public boolean isReadOnly() {
return (dosAttribute & DOS_XATTR_READONLY) != 0;
}
@Override
public boolean isHidden() {
return (dosAttribute & DOS_XATTR_HIDDEN) != 0;
}
@Override
public boolean isArchive() {
return (dosAttribute & DOS_XATTR_ARCHIVE) != 0;
}
@Override
public boolean isSystem() {
return (dosAttribute & DOS_XATTR_SYSTEM) != 0;
}
};
} catch (UnixException x) {
x.rethrowAsIOException(file);
return null; // keep compiler happy
} finally {
close(fd);
}
}
@Override
public void setReadOnly(boolean value) throws IOException {
updateDosAttribute(DOS_XATTR_READONLY, value);
}
@Override
public void setHidden(boolean value) throws IOException {
updateDosAttribute(DOS_XATTR_HIDDEN, value);
}
@Override
public void setArchive(boolean value) throws IOException {
updateDosAttribute(DOS_XATTR_ARCHIVE, value);
}
@Override
public void setSystem(boolean value) throws IOException {
updateDosAttribute(DOS_XATTR_SYSTEM, value);
}
/**
* Reads the value of the user.DOSATTRIB extended attribute
*/
private int getDosAttribute(int fd) throws UnixException {
final int size = 24;
NativeBuffer buffer = NativeBuffers.getNativeBuffer(size);
try {
int len = LinuxNativeDispatcher
.fgetxattr(fd, DOS_XATTR_NAME_AS_BYTES, buffer.address(), size);
if (len > 0) {
// ignore null terminator
if (unsafe.getByte(buffer.address()+len-1) == 0)
len--;
// convert to String and parse
byte[] buf = new byte[len];
unsafe.copyMemory(null, buffer.address(), buf,
Unsafe.ARRAY_BYTE_BASE_OFFSET, len);
String value = Util.toString(buf);
// should be something like 0x20
if (value.length() >= 3 && value.startsWith("0x")) {
try {
return Integer.parseInt(value.substring(2), 16);
} catch (NumberFormatException x) {
// ignore
}
}
}
throw new UnixException("Value of " + DOS_XATTR_NAME + " attribute is invalid");
} catch (UnixException x) {
// default value when attribute does not exist
if (x.errno() == ENODATA)
return 0;
throw x;
} finally {
buffer.release();
}
}
/**
* Updates the value of the user.DOSATTRIB extended attribute
*/
private void updateDosAttribute(int flag, boolean enable) throws IOException {
file.checkWrite();
int fd = -1;
try {
fd = file.openForAttributeAccess(followLinks);
int oldValue = getDosAttribute(fd);
int newValue = oldValue;
if (enable) {
newValue |= flag;
} else {
newValue &= ~flag;
}
if (newValue != oldValue) {
byte[] value = Util.toBytes("0x" + Integer.toHexString(newValue));
NativeBuffer buffer = NativeBuffers.asNativeBuffer(value);
try {
LinuxNativeDispatcher.fsetxattr(fd, DOS_XATTR_NAME_AS_BYTES,
buffer.address(), value.length+1);
} finally {
buffer.release();
}
}
} catch (UnixException x) {
x.rethrowAsIOException(file);
} finally {
close(fd);
}
}
}

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/*
* Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.fs;
import java.nio.file.attribute.*;
import java.util.*;
import java.io.IOException;
/**
* Linux implementation of FileStore
*/
class LinuxFileStore
extends UnixFileStore
{
// used when checking if extended attributes are enabled or not
private volatile boolean xattrChecked;
private volatile boolean xattrEnabled;
LinuxFileStore(UnixPath file) throws IOException {
super(file);
}
LinuxFileStore(UnixFileSystem fs, UnixMountEntry entry) throws IOException {
super(fs, entry);
}
/**
* Finds, and returns, the mount entry for the file system where the file
* resides.
*/
@Override
UnixMountEntry findMountEntry() throws IOException {
LinuxFileSystem fs = (LinuxFileSystem)file().getFileSystem();
// step 1: get realpath
UnixPath path = null;
try {
byte[] rp = UnixNativeDispatcher.realpath(file());
path = new UnixPath(fs, rp);
} catch (UnixException x) {
x.rethrowAsIOException(file());
}
// step 2: find mount point
UnixPath parent = path.getParent();
while (parent != null) {
UnixFileAttributes attrs = null;
try {
attrs = UnixFileAttributes.get(parent, true);
} catch (UnixException x) {
x.rethrowAsIOException(parent);
}
if (attrs.dev() != dev())
break;
path = parent;
parent = parent.getParent();
}
// step 3: lookup mounted file systems (use /proc/mounts to ensure we
// find the file system even when not in /etc/mtab)
byte[] dir = path.asByteArray();
for (UnixMountEntry entry: fs.getMountEntries("/proc/mounts")) {
if (Arrays.equals(dir, entry.dir()))
return entry;
}
throw new IOException("Mount point not found");
}
// returns true if extended attributes enabled on file system where given
// file resides, returns false if disabled or unable to determine.
private boolean isExtendedAttributesEnabled(UnixPath path) {
int fd = -1;
try {
fd = path.openForAttributeAccess(false);
// fgetxattr returns size if called with size==0
byte[] name = Util.toBytes("user.java");
LinuxNativeDispatcher.fgetxattr(fd, name, 0L, 0);
return true;
} catch (UnixException e) {
// attribute does not exist
if (e.errno() == UnixConstants.ENODATA)
return true;
} finally {
UnixNativeDispatcher.close(fd);
}
return false;
}
@Override
public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) {
// support DosFileAttributeView and UserDefinedAttributeView if extended
// attributes enabled
if (type == DosFileAttributeView.class ||
type == UserDefinedFileAttributeView.class)
{
// lookup fstypes.properties
FeatureStatus status = checkIfFeaturePresent("user_xattr");
if (status == FeatureStatus.PRESENT)
return true;
if (status == FeatureStatus.NOT_PRESENT)
return false;
// if file system is mounted with user_xattr option then assume
// extended attributes are enabled
if ((entry().hasOption("user_xattr")))
return true;
// user_xattr option not present but we special-case ext3/4 as we
// know that extended attributes are not enabled by default.
if (entry().fstype().equals("ext3") || entry().fstype().equals("ext4"))
return false;
// not ext3/4 so probe mount point
if (!xattrChecked) {
UnixPath dir = new UnixPath(file().getFileSystem(), entry().dir());
xattrEnabled = isExtendedAttributesEnabled(dir);
xattrChecked = true;
}
return xattrEnabled;
}
// POSIX attributes not supported on FAT
if (type == PosixFileAttributeView.class && entry().fstype().equals("vfat"))
return false;
return super.supportsFileAttributeView(type);
}
@Override
public boolean supportsFileAttributeView(String name) {
if (name.equals("dos"))
return supportsFileAttributeView(DosFileAttributeView.class);
if (name.equals("user"))
return supportsFileAttributeView(UserDefinedFileAttributeView.class);
return super.supportsFileAttributeView(name);
}
}

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/*
* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.fs;
import java.nio.file.*;
import java.io.IOException;
import java.util.*;
import static sun.nio.fs.LinuxNativeDispatcher.*;
/**
* Linux implementation of FileSystem
*/
class LinuxFileSystem extends UnixFileSystem {
LinuxFileSystem(UnixFileSystemProvider provider, String dir) {
super(provider, dir);
}
@Override
public WatchService newWatchService()
throws IOException
{
// assume 2.6.13 or newer
return new LinuxWatchService(this);
}
// lazy initialization of the list of supported attribute views
private static class SupportedFileFileAttributeViewsHolder {
static final Set<String> supportedFileAttributeViews =
supportedFileAttributeViews();
private static Set<String> supportedFileAttributeViews() {
Set<String> result = new HashSet<>();
result.addAll(standardFileAttributeViews());
// additional Linux-specific views
result.add("dos");
result.add("user");
return Collections.unmodifiableSet(result);
}
}
@Override
public Set<String> supportedFileAttributeViews() {
return SupportedFileFileAttributeViewsHolder.supportedFileAttributeViews;
}
@Override
void copyNonPosixAttributes(int ofd, int nfd) {
LinuxUserDefinedFileAttributeView.copyExtendedAttributes(ofd, nfd);
}
/**
* Returns object to iterate over the mount entries in the given fstab file.
*/
Iterable<UnixMountEntry> getMountEntries(String fstab) {
ArrayList<UnixMountEntry> entries = new ArrayList<>();
try {
long fp = setmntent(Util.toBytes(fstab), Util.toBytes("r"));
try {
for (;;) {
UnixMountEntry entry = new UnixMountEntry();
int res = getmntent(fp, entry);
if (res < 0)
break;
entries.add(entry);
}
} finally {
endmntent(fp);
}
} catch (UnixException x) {
// nothing we can do
}
return entries;
}
/**
* Returns object to iterate over the mount entries in /etc/mtab
*/
@Override
Iterable<UnixMountEntry> getMountEntries() {
return getMountEntries("/etc/mtab");
}
@Override
FileStore getFileStore(UnixMountEntry entry) throws IOException {
return new LinuxFileStore(this, entry);
}
}

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/*
* Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.fs;
import java.nio.file.*;
import java.nio.file.attribute.*;
import java.nio.file.spi.FileTypeDetector;
import java.io.IOException;
import java.security.AccessController;
import sun.security.action.GetPropertyAction;
/**
* Linux implementation of FileSystemProvider
*/
public class LinuxFileSystemProvider extends UnixFileSystemProvider {
public LinuxFileSystemProvider() {
super();
}
@Override
LinuxFileSystem newFileSystem(String dir) {
return new LinuxFileSystem(this, dir);
}
@Override
LinuxFileStore getFileStore(UnixPath path) throws IOException {
return new LinuxFileStore(path);
}
@Override
@SuppressWarnings("unchecked")
public <V extends FileAttributeView> V getFileAttributeView(Path obj,
Class<V> type,
LinkOption... options)
{
if (type == DosFileAttributeView.class) {
return (V) new LinuxDosFileAttributeView(UnixPath.toUnixPath(obj),
Util.followLinks(options));
}
if (type == UserDefinedFileAttributeView.class) {
return (V) new LinuxUserDefinedFileAttributeView(UnixPath.toUnixPath(obj),
Util.followLinks(options));
}
return super.getFileAttributeView(obj, type, options);
}
@Override
public DynamicFileAttributeView getFileAttributeView(Path obj,
String name,
LinkOption... options)
{
if (name.equals("dos")) {
return new LinuxDosFileAttributeView(UnixPath.toUnixPath(obj),
Util.followLinks(options));
}
if (name.equals("user")) {
return new LinuxUserDefinedFileAttributeView(UnixPath.toUnixPath(obj),
Util.followLinks(options));
}
return super.getFileAttributeView(obj, name, options);
}
@Override
@SuppressWarnings("unchecked")
public <A extends BasicFileAttributes> A readAttributes(Path file,
Class<A> type,
LinkOption... options)
throws IOException
{
if (type == DosFileAttributes.class) {
DosFileAttributeView view =
getFileAttributeView(file, DosFileAttributeView.class, options);
return (A) view.readAttributes();
} else {
return super.readAttributes(file, type, options);
}
}
@Override
FileTypeDetector getFileTypeDetector() {
String userHome = GetPropertyAction.privilegedGetProperty("user.home");
Path userMimeTypes = Paths.get(userHome, ".mime.types");
Path etcMimeTypes = Paths.get("/etc/mime.types");
return chain(new MimeTypesFileTypeDetector(userMimeTypes),
new MimeTypesFileTypeDetector(etcMimeTypes));
}
}

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/*
* Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.fs;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* Linux specific system calls.
*/
class LinuxNativeDispatcher extends UnixNativeDispatcher {
private LinuxNativeDispatcher() { }
/**
* FILE *setmntent(const char *filename, const char *type);
*/
static long setmntent(byte[] filename, byte[] type) throws UnixException {
NativeBuffer pathBuffer = NativeBuffers.asNativeBuffer(filename);
NativeBuffer typeBuffer = NativeBuffers.asNativeBuffer(type);
try {
return setmntent0(pathBuffer.address(), typeBuffer.address());
} finally {
typeBuffer.release();
pathBuffer.release();
}
}
private static native long setmntent0(long pathAddress, long typeAddress)
throws UnixException;
/**
* int getmntent(FILE *fp, struct mnttab *mp, int len);
*/
static native int getmntent(long fp, UnixMountEntry entry)
throws UnixException;
/**
* int endmntent(FILE* filep);
*/
static native void endmntent(long stream) throws UnixException;
/**
* ssize_t fgetxattr(int filedes, const char *name, void *value, size_t size);
*/
static int fgetxattr(int filedes, byte[] name, long valueAddress,
int valueLen) throws UnixException
{
NativeBuffer buffer = NativeBuffers.asNativeBuffer(name);
try {
return fgetxattr0(filedes, buffer.address(), valueAddress, valueLen);
} finally {
buffer.release();
}
}
private static native int fgetxattr0(int filedes, long nameAddress,
long valueAddress, int valueLen) throws UnixException;
/**
* fsetxattr(int filedes, const char *name, const void *value, size_t size, int flags);
*/
static void fsetxattr(int filedes, byte[] name, long valueAddress,
int valueLen) throws UnixException
{
NativeBuffer buffer = NativeBuffers.asNativeBuffer(name);
try {
fsetxattr0(filedes, buffer.address(), valueAddress, valueLen);
} finally {
buffer.release();
}
}
private static native void fsetxattr0(int filedes, long nameAddress,
long valueAddress, int valueLen) throws UnixException;
/**
* fremovexattr(int filedes, const char *name);
*/
static void fremovexattr(int filedes, byte[] name) throws UnixException {
NativeBuffer buffer = NativeBuffers.asNativeBuffer(name);
try {
fremovexattr0(filedes, buffer.address());
} finally {
buffer.release();
}
}
private static native void fremovexattr0(int filedes, long nameAddress)
throws UnixException;
/**
* size_t flistxattr(int filedes, const char *list, size_t size)
*/
static native int flistxattr(int filedes, long listAddress, int size)
throws UnixException;
// initialize
private static native void init();
static {
AccessController.doPrivileged(new PrivilegedAction<>() {
public Void run() {
System.loadLibrary("nio");
return null;
}});
init();
}
}

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/*
* Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.fs;
import java.nio.file.*;
import java.nio.ByteBuffer;
import java.io.IOException;
import java.util.*;
import jdk.internal.misc.Unsafe;
import static sun.nio.fs.UnixConstants.*;
import static sun.nio.fs.LinuxNativeDispatcher.*;
/**
* Linux implementation of UserDefinedFileAttributeView using extended attributes.
*/
class LinuxUserDefinedFileAttributeView
extends AbstractUserDefinedFileAttributeView
{
private static final Unsafe unsafe = Unsafe.getUnsafe();
// namespace for extended user attributes
private static final String USER_NAMESPACE = "user.";
// maximum bytes in extended attribute name (includes namespace)
private static final int XATTR_NAME_MAX = 255;
private byte[] nameAsBytes(UnixPath file, String name) throws IOException {
if (name == null)
throw new NullPointerException("'name' is null");
name = USER_NAMESPACE + name;
byte[] bytes = Util.toBytes(name);
if (bytes.length > XATTR_NAME_MAX) {
throw new FileSystemException(file.getPathForExceptionMessage(),
null, "'" + name + "' is too big");
}
return bytes;
}
// Parses buffer as array of NULL-terminated C strings.
private List<String> asList(long address, int size) {
List<String> list = new ArrayList<>();
int start = 0;
int pos = 0;
while (pos < size) {
if (unsafe.getByte(address + pos) == 0) {
int len = pos - start;
byte[] value = new byte[len];
unsafe.copyMemory(null, address+start, value,
Unsafe.ARRAY_BYTE_BASE_OFFSET, len);
String s = Util.toString(value);
if (s.startsWith(USER_NAMESPACE)) {
s = s.substring(USER_NAMESPACE.length());
list.add(s);
}
start = pos + 1;
}
pos++;
}
return list;
}
private final UnixPath file;
private final boolean followLinks;
LinuxUserDefinedFileAttributeView(UnixPath file, boolean followLinks) {
this.file = file;
this.followLinks = followLinks;
}
@Override
public List<String> list() throws IOException {
if (System.getSecurityManager() != null)
checkAccess(file.getPathForPermissionCheck(), true, false);
int fd = -1;
try {
fd = file.openForAttributeAccess(followLinks);
} catch (UnixException x) {
x.rethrowAsIOException(file);
}
NativeBuffer buffer = null;
try {
int size = 1024;
buffer = NativeBuffers.getNativeBuffer(size);
for (;;) {
try {
int n = flistxattr(fd, buffer.address(), size);
List<String> list = asList(buffer.address(), n);
return Collections.unmodifiableList(list);
} catch (UnixException x) {
// allocate larger buffer if required
if (x.errno() == ERANGE && size < 32*1024) {
buffer.release();
size *= 2;
buffer = null;
buffer = NativeBuffers.getNativeBuffer(size);
continue;
}
throw new FileSystemException(file.getPathForExceptionMessage(),
null, "Unable to get list of extended attributes: " +
x.getMessage());
}
}
} finally {
if (buffer != null)
buffer.release();
close(fd);
}
}
@Override
public int size(String name) throws IOException {
if (System.getSecurityManager() != null)
checkAccess(file.getPathForPermissionCheck(), true, false);
int fd = -1;
try {
fd = file.openForAttributeAccess(followLinks);
} catch (UnixException x) {
x.rethrowAsIOException(file);
}
try {
// fgetxattr returns size if called with size==0
return fgetxattr(fd, nameAsBytes(file,name), 0L, 0);
} catch (UnixException x) {
throw new FileSystemException(file.getPathForExceptionMessage(),
null, "Unable to get size of extended attribute '" + name +
"': " + x.getMessage());
} finally {
close(fd);
}
}
@Override
public int read(String name, ByteBuffer dst) throws IOException {
if (System.getSecurityManager() != null)
checkAccess(file.getPathForPermissionCheck(), true, false);
if (dst.isReadOnly())
throw new IllegalArgumentException("Read-only buffer");
int pos = dst.position();
int lim = dst.limit();
assert (pos <= lim);
int rem = (pos <= lim ? lim - pos : 0);
NativeBuffer nb;
long address;
if (dst instanceof sun.nio.ch.DirectBuffer) {
nb = null;
address = ((sun.nio.ch.DirectBuffer)dst).address() + pos;
} else {
// substitute with native buffer
nb = NativeBuffers.getNativeBuffer(rem);
address = nb.address();
}
int fd = -1;
try {
fd = file.openForAttributeAccess(followLinks);
} catch (UnixException x) {
x.rethrowAsIOException(file);
}
try {
try {
int n = fgetxattr(fd, nameAsBytes(file,name), address, rem);
// if remaining is zero then fgetxattr returns the size
if (rem == 0) {
if (n > 0)
throw new UnixException(ERANGE);
return 0;
}
// copy from buffer into backing array if necessary
if (nb != null) {
int off = dst.arrayOffset() + pos + Unsafe.ARRAY_BYTE_BASE_OFFSET;
unsafe.copyMemory(null, address, dst.array(), off, n);
}
dst.position(pos + n);
return n;
} catch (UnixException x) {
String msg = (x.errno() == ERANGE) ?
"Insufficient space in buffer" : x.getMessage();
throw new FileSystemException(file.getPathForExceptionMessage(),
null, "Error reading extended attribute '" + name + "': " + msg);
} finally {
close(fd);
}
} finally {
if (nb != null)
nb.release();
}
}
@Override
public int write(String name, ByteBuffer src) throws IOException {
if (System.getSecurityManager() != null)
checkAccess(file.getPathForPermissionCheck(), false, true);
int pos = src.position();
int lim = src.limit();
assert (pos <= lim);
int rem = (pos <= lim ? lim - pos : 0);
NativeBuffer nb;
long address;
if (src instanceof sun.nio.ch.DirectBuffer) {
nb = null;
address = ((sun.nio.ch.DirectBuffer)src).address() + pos;
} else {
// substitute with native buffer
nb = NativeBuffers.getNativeBuffer(rem);
address = nb.address();
if (src.hasArray()) {
// copy from backing array into buffer
int off = src.arrayOffset() + pos + Unsafe.ARRAY_BYTE_BASE_OFFSET;
unsafe.copyMemory(src.array(), off, null, address, rem);
} else {
// backing array not accessible so transfer via temporary array
byte[] tmp = new byte[rem];
src.get(tmp);
src.position(pos); // reset position as write may fail
unsafe.copyMemory(tmp, Unsafe.ARRAY_BYTE_BASE_OFFSET, null,
address, rem);
}
}
int fd = -1;
try {
fd = file.openForAttributeAccess(followLinks);
} catch (UnixException x) {
x.rethrowAsIOException(file);
}
try {
try {
fsetxattr(fd, nameAsBytes(file,name), address, rem);
src.position(pos + rem);
return rem;
} catch (UnixException x) {
throw new FileSystemException(file.getPathForExceptionMessage(),
null, "Error writing extended attribute '" + name + "': " +
x.getMessage());
} finally {
close(fd);
}
} finally {
if (nb != null)
nb.release();
}
}
@Override
public void delete(String name) throws IOException {
if (System.getSecurityManager() != null)
checkAccess(file.getPathForPermissionCheck(), false, true);
int fd = -1;
try {
fd = file.openForAttributeAccess(followLinks);
} catch (UnixException x) {
x.rethrowAsIOException(file);
}
try {
fremovexattr(fd, nameAsBytes(file,name));
} catch (UnixException x) {
throw new FileSystemException(file.getPathForExceptionMessage(),
null, "Unable to delete extended attribute '" + name + "': " + x.getMessage());
} finally {
close(fd);
}
}
/**
* Used by copyTo/moveTo to copy extended attributes from source to target.
*
* @param ofd
* file descriptor for source file
* @param nfd
* file descriptor for target file
*/
static void copyExtendedAttributes(int ofd, int nfd) {
NativeBuffer buffer = null;
try {
// call flistxattr to get list of extended attributes.
int size = 1024;
buffer = NativeBuffers.getNativeBuffer(size);
for (;;) {
try {
size = flistxattr(ofd, buffer.address(), size);
break;
} catch (UnixException x) {
// allocate larger buffer if required
if (x.errno() == ERANGE && size < 32*1024) {
buffer.release();
size *= 2;
buffer = null;
buffer = NativeBuffers.getNativeBuffer(size);
continue;
}
// unable to get list of attributes
return;
}
}
// parse buffer as array of NULL-terminated C strings.
long address = buffer.address();
int start = 0;
int pos = 0;
while (pos < size) {
if (unsafe.getByte(address + pos) == 0) {
// extract attribute name and copy attribute to target.
// FIXME: We can avoid needless copying by using address+pos
// as the address of the name.
int len = pos - start;
byte[] name = new byte[len];
unsafe.copyMemory(null, address+start, name,
Unsafe.ARRAY_BYTE_BASE_OFFSET, len);
try {
copyExtendedAttribute(ofd, name, nfd);
} catch (UnixException ignore) {
// ignore
}
start = pos + 1;
}
pos++;
}
} finally {
if (buffer != null)
buffer.release();
}
}
private static void copyExtendedAttribute(int ofd, byte[] name, int nfd)
throws UnixException
{
int size = fgetxattr(ofd, name, 0L, 0);
NativeBuffer buffer = NativeBuffers.getNativeBuffer(size);
try {
long address = buffer.address();
size = fgetxattr(ofd, name, address, size);
fsetxattr(nfd, name, address, size);
} finally {
buffer.release();
}
}
}

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/*
* Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.nio.fs;
import java.nio.file.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.*;
import java.io.IOException;
import jdk.internal.misc.Unsafe;
import static sun.nio.fs.UnixNativeDispatcher.*;
import static sun.nio.fs.UnixConstants.*;
/**
* Linux implementation of WatchService based on inotify.
*
* In summary a background thread polls inotify plus a socket used for the wakeup
* mechanism. Requests to add or remove a watch, or close the watch service,
* cause the thread to wakeup and process the request. Events are processed
* by the thread which causes it to signal/queue the corresponding watch keys.
*/
class LinuxWatchService
extends AbstractWatchService
{
private static final Unsafe unsafe = Unsafe.getUnsafe();
// background thread to read change events
private final Poller poller;
LinuxWatchService(UnixFileSystem fs) throws IOException {
// initialize inotify
int ifd = - 1;
try {
ifd = inotifyInit();
} catch (UnixException x) {
String msg = (x.errno() == EMFILE) ?
"User limit of inotify instances reached or too many open files" :
x.errorString();
throw new IOException(msg);
}
// configure inotify to be non-blocking
// create socketpair used in the close mechanism
int sp[] = new int[2];
try {
configureBlocking(ifd, false);
socketpair(sp);
configureBlocking(sp[0], false);
} catch (UnixException x) {
UnixNativeDispatcher.close(ifd);
throw new IOException(x.errorString());
}
this.poller = new Poller(fs, this, ifd, sp);
this.poller.start();
}
@Override
WatchKey register(Path dir,
WatchEvent.Kind<?>[] events,
WatchEvent.Modifier... modifiers)
throws IOException
{
// delegate to poller
return poller.register(dir, events, modifiers);
}
@Override
void implClose() throws IOException {
// delegate to poller
poller.close();
}
/**
* WatchKey implementation
*/
private static class LinuxWatchKey extends AbstractWatchKey {
// inotify descriptor
private final int ifd;
// watch descriptor
private volatile int wd;
LinuxWatchKey(UnixPath dir, LinuxWatchService watcher, int ifd, int wd) {
super(dir, watcher);
this.ifd = ifd;
this.wd = wd;
}
int descriptor() {
return wd;
}
void invalidate(boolean remove) {
if (remove) {
try {
inotifyRmWatch(ifd, wd);
} catch (UnixException x) {
// ignore
}
}
wd = -1;
}
@Override
public boolean isValid() {
return (wd != -1);
}
@Override
public void cancel() {
if (isValid()) {
// delegate to poller
((LinuxWatchService)watcher()).poller.cancel(this);
}
}
}
/**
* Background thread to read from inotify
*/
private static class Poller extends AbstractPoller {
/**
* struct inotify_event {
* int wd;
* uint32_t mask;
* uint32_t len;
* char name __flexarr; // present if len > 0
* } act_t;
*/
private static final int SIZEOF_INOTIFY_EVENT = eventSize();
private static final int[] offsets = eventOffsets();
private static final int OFFSETOF_WD = offsets[0];
private static final int OFFSETOF_MASK = offsets[1];
private static final int OFFSETOF_LEN = offsets[3];
private static final int OFFSETOF_NAME = offsets[4];
private static final int IN_MODIFY = 0x00000002;
private static final int IN_ATTRIB = 0x00000004;
private static final int IN_MOVED_FROM = 0x00000040;
private static final int IN_MOVED_TO = 0x00000080;
private static final int IN_CREATE = 0x00000100;
private static final int IN_DELETE = 0x00000200;
private static final int IN_UNMOUNT = 0x00002000;
private static final int IN_Q_OVERFLOW = 0x00004000;
private static final int IN_IGNORED = 0x00008000;
// sizeof buffer for when polling inotify
private static final int BUFFER_SIZE = 8192;
private final UnixFileSystem fs;
private final LinuxWatchService watcher;
// inotify file descriptor
private final int ifd;
// socketpair used to shutdown polling thread
private final int socketpair[];
// maps watch descriptor to Key
private final Map<Integer,LinuxWatchKey> wdToKey;
// address of read buffer
private final long address;
Poller(UnixFileSystem fs, LinuxWatchService watcher, int ifd, int[] sp) {
this.fs = fs;
this.watcher = watcher;
this.ifd = ifd;
this.socketpair = sp;
this.wdToKey = new HashMap<>();
this.address = unsafe.allocateMemory(BUFFER_SIZE);
}
@Override
void wakeup() throws IOException {
// write to socketpair to wakeup polling thread
try {
write(socketpair[1], address, 1);
} catch (UnixException x) {
throw new IOException(x.errorString());
}
}
@Override
Object implRegister(Path obj,
Set<? extends WatchEvent.Kind<?>> events,
WatchEvent.Modifier... modifiers)
{
UnixPath dir = (UnixPath)obj;
int mask = 0;
for (WatchEvent.Kind<?> event: events) {
if (event == StandardWatchEventKinds.ENTRY_CREATE) {
mask |= IN_CREATE | IN_MOVED_TO;
continue;
}
if (event == StandardWatchEventKinds.ENTRY_DELETE) {
mask |= IN_DELETE | IN_MOVED_FROM;
continue;
}
if (event == StandardWatchEventKinds.ENTRY_MODIFY) {
mask |= IN_MODIFY | IN_ATTRIB;
continue;
}
}
// no modifiers supported at this time
if (modifiers.length > 0) {
for (WatchEvent.Modifier modifier: modifiers) {
if (modifier == null)
return new NullPointerException();
if (!ExtendedOptions.SENSITIVITY_HIGH.matches(modifier) &&
!ExtendedOptions.SENSITIVITY_MEDIUM.matches(modifier) &&
!ExtendedOptions.SENSITIVITY_LOW.matches(modifier)) {
return new UnsupportedOperationException("Modifier not supported");
}
}
}
// check file is directory
UnixFileAttributes attrs = null;
try {
attrs = UnixFileAttributes.get(dir, true);
} catch (UnixException x) {
return x.asIOException(dir);
}
if (!attrs.isDirectory()) {
return new NotDirectoryException(dir.getPathForExceptionMessage());
}
// register with inotify (replaces existing mask if already registered)
int wd = -1;
try {
NativeBuffer buffer =
NativeBuffers.asNativeBuffer(dir.getByteArrayForSysCalls());
try {
wd = inotifyAddWatch(ifd, buffer.address(), mask);
} finally {
buffer.release();
}
} catch (UnixException x) {
if (x.errno() == ENOSPC) {
return new IOException("User limit of inotify watches reached");
}
return x.asIOException(dir);
}
// ensure watch descriptor is in map
LinuxWatchKey key = wdToKey.get(wd);
if (key == null) {
key = new LinuxWatchKey(dir, watcher, ifd, wd);
wdToKey.put(wd, key);
}
return key;
}
// cancel single key
@Override
void implCancelKey(WatchKey obj) {
LinuxWatchKey key = (LinuxWatchKey)obj;
if (key.isValid()) {
wdToKey.remove(key.descriptor());
key.invalidate(true);
}
}
// close watch service
@Override
void implCloseAll() {
// invalidate all keys
for (Map.Entry<Integer,LinuxWatchKey> entry: wdToKey.entrySet()) {
entry.getValue().invalidate(true);
}
wdToKey.clear();
// free resources
unsafe.freeMemory(address);
UnixNativeDispatcher.close(socketpair[0]);
UnixNativeDispatcher.close(socketpair[1]);
UnixNativeDispatcher.close(ifd);
}
/**
* Poller main loop
*/
@Override
public void run() {
try {
for (;;) {
int nReady, bytesRead;
// wait for close or inotify event
nReady = poll(ifd, socketpair[0]);
// read from inotify
try {
bytesRead = read(ifd, address, BUFFER_SIZE);
} catch (UnixException x) {
if (x.errno() != EAGAIN)
throw x;
bytesRead = 0;
}
// iterate over buffer to decode events
int offset = 0;
while (offset < bytesRead) {
long event = address + offset;
int wd = unsafe.getInt(event + OFFSETOF_WD);
int mask = unsafe.getInt(event + OFFSETOF_MASK);
int len = unsafe.getInt(event + OFFSETOF_LEN);
// file name
UnixPath name = null;
if (len > 0) {
int actual = len;
// null-terminated and maybe additional null bytes to
// align the next event
while (actual > 0) {
long last = event + OFFSETOF_NAME + actual - 1;
if (unsafe.getByte(last) != 0)
break;
actual--;
}
if (actual > 0) {
byte[] buf = new byte[actual];
unsafe.copyMemory(null, event + OFFSETOF_NAME,
buf, Unsafe.ARRAY_BYTE_BASE_OFFSET, actual);
name = new UnixPath(fs, buf);
}
}
// process event
processEvent(wd, mask, name);
offset += (SIZEOF_INOTIFY_EVENT + len);
}
// process any pending requests
if ((nReady > 1) || (nReady == 1 && bytesRead == 0)) {
try {
read(socketpair[0], address, BUFFER_SIZE);
boolean shutdown = processRequests();
if (shutdown)
break;
} catch (UnixException x) {
if (x.errno() != UnixConstants.EAGAIN)
throw x;
}
}
}
} catch (UnixException x) {
x.printStackTrace();
}
}
/**
* map inotify event to WatchEvent.Kind
*/
private WatchEvent.Kind<?> maskToEventKind(int mask) {
if ((mask & IN_MODIFY) > 0)
return StandardWatchEventKinds.ENTRY_MODIFY;
if ((mask & IN_ATTRIB) > 0)
return StandardWatchEventKinds.ENTRY_MODIFY;
if ((mask & IN_CREATE) > 0)
return StandardWatchEventKinds.ENTRY_CREATE;
if ((mask & IN_MOVED_TO) > 0)
return StandardWatchEventKinds.ENTRY_CREATE;
if ((mask & IN_DELETE) > 0)
return StandardWatchEventKinds.ENTRY_DELETE;
if ((mask & IN_MOVED_FROM) > 0)
return StandardWatchEventKinds.ENTRY_DELETE;
return null;
}
/**
* Process event from inotify
*/
private void processEvent(int wd, int mask, final UnixPath name) {
// overflow - signal all keys
if ((mask & IN_Q_OVERFLOW) > 0) {
for (Map.Entry<Integer,LinuxWatchKey> entry: wdToKey.entrySet()) {
entry.getValue()
.signalEvent(StandardWatchEventKinds.OVERFLOW, null);
}
return;
}
// lookup wd to get key
LinuxWatchKey key = wdToKey.get(wd);
if (key == null)
return; // should not happen
// file deleted
if ((mask & IN_IGNORED) > 0) {
wdToKey.remove(wd);
key.invalidate(false);
key.signal();
return;
}
// event for directory itself
if (name == null)
return;
// map to event and queue to key
WatchEvent.Kind<?> kind = maskToEventKind(mask);
if (kind != null) {
key.signalEvent(kind, name);
}
}
}
// -- native methods --
// sizeof inotify_event
private static native int eventSize();
// offsets of inotify_event
private static native int[] eventOffsets();
private static native int inotifyInit() throws UnixException;
private static native int inotifyAddWatch(int fd, long pathAddress, int mask)
throws UnixException;
private static native void inotifyRmWatch(int fd, int wd)
throws UnixException;
private static native void configureBlocking(int fd, boolean blocking)
throws UnixException;
private static native void socketpair(int[] sv) throws UnixException;
private static native int poll(int fd1, int fd2) throws UnixException;
static {
AccessController.doPrivileged(new PrivilegedAction<>() {
public Void run() {
System.loadLibrary("nio");
return null;
}});
}
}

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/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "jni.h"
#include "jni_util.h"
#include "java_lang_ProcessHandleImpl.h"
#include "java_lang_ProcessHandleImpl_Info.h"
#include "ProcessHandleImpl_unix.h"
#include <fcntl.h>
#include <limits.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <ctype.h>
/*
* Implementation of native ProcessHandleImpl functions for Linux.
* See ProcessHandleImpl_unix.c for more details.
*/
/* Signatures for internal OS specific functions. */
static long long getBoottime(JNIEnv *env);
/* A static offset in milliseconds since boot. */
static long long bootTime_ms;
static long clock_ticks_per_second;
static int pageSize;
void os_initNative(JNIEnv *env, jclass clazz) {
bootTime_ms = getBoottime(env);
clock_ticks_per_second = sysconf(_SC_CLK_TCK);
pageSize = sysconf(_SC_PAGESIZE);
}
jint os_getChildren(JNIEnv *env, jlong jpid, jlongArray jarray,
jlongArray jparentArray, jlongArray jstimesArray) {
return unix_getChildren(env, jpid, jarray, jparentArray, jstimesArray);
}
/**
* Read /proc/<pid>/stat and return the ppid, total cputime and start time.
* -1 is fail; >= 0 is parent pid
* 'total' will contain the running time of 'pid' in nanoseconds.
* 'start' will contain the start time of 'pid' in milliseconds since epoch.
*/
pid_t os_getParentPidAndTimings(JNIEnv *env, pid_t pid,
jlong *totalTime, jlong* startTime) {
FILE* fp;
char buffer[2048];
int statlen;
char fn[32];
char* s;
int parentPid;
long unsigned int utime = 0; // clock tics
long unsigned int stime = 0; // clock tics
long long unsigned int start = 0; // microseconds
/*
* Try to stat and then open /proc/%d/stat
*/
snprintf(fn, sizeof fn, "/proc/%d/stat", pid);
fp = fopen(fn, "r");
if (fp == NULL) {
return -1; // fail, no such /proc/pid/stat
}
/*
* The format is: pid (command) state ppid ...
* As the command could be anything we must find the right most
* ")" and then skip the white spaces that follow it.
*/
statlen = fread(buffer, 1, (sizeof buffer - 1), fp);
fclose(fp);
if (statlen < 0) {
return -1; // parent pid is not available
}
buffer[statlen] = '\0';
s = strchr(buffer, '(');
if (s == NULL) {
return -1; // parent pid is not available
}
// Found start of command, skip to end
s++;
s = strrchr(s, ')');
if (s == NULL) {
return -1; // parent pid is not available
}
s++;
// Scan the needed fields from status, retaining only ppid(4),
// utime (14), stime(15), starttime(22)
if (4 != sscanf(s, " %*c %d %*d %*d %*d %*d %*d %*u %*u %*u %*u %lu %lu %*d %*d %*d %*d %*d %*d %llu",
&parentPid, &utime, &stime, &start)) {
return 0; // not all values parsed; return error
}
*totalTime = (utime + stime) * (jlong)(1000000000 / clock_ticks_per_second);
*startTime = bootTime_ms + ((start * 1000) / clock_ticks_per_second);
return parentPid;
}
void os_getCmdlineAndUserInfo(JNIEnv *env, jobject jinfo, pid_t pid) {
int fd;
int cmdlen = 0;
char *cmdline = NULL, *cmdEnd = NULL; // used for command line args and exe
char *args = NULL;
jstring cmdexe = NULL;
char fn[32];
struct stat stat_buf;
/*
* Stat /proc/<pid> to get the user id
*/
snprintf(fn, sizeof fn, "/proc/%d", pid);
if (stat(fn, &stat_buf) == 0) {
unix_getUserInfo(env, jinfo, stat_buf.st_uid);
JNU_CHECK_EXCEPTION(env);
}
/*
* Try to open /proc/<pid>/cmdline
*/
strncat(fn, "/cmdline", sizeof fn - strnlen(fn, sizeof fn) - 1);
if ((fd = open(fn, O_RDONLY)) < 0) {
return;
}
do { // Block to break out of on errors
int i, truncated = 0;
int count;
char *s;
/*
* The path name read by readlink() is limited to PATH_MAX characters.
* The content of /proc/<pid>/cmdline is limited to PAGE_SIZE characters.
*/
cmdline = (char*)malloc((PATH_MAX > pageSize ? PATH_MAX : pageSize) + 1);
if (cmdline == NULL) {
break;
}
/*
* On Linux, the full path to the executable command is the link in
* /proc/<pid>/exe. But it is only readable for processes we own.
*/
snprintf(fn, sizeof fn, "/proc/%d/exe", pid);
if ((cmdlen = readlink(fn, cmdline, PATH_MAX)) > 0) {
// null terminate and create String to store for command
cmdline[cmdlen] = '\0';
cmdexe = JNU_NewStringPlatform(env, cmdline);
(*env)->ExceptionClear(env); // unconditionally clear any exception
}
/*
* The command-line arguments appear as a set of strings separated by
* null bytes ('\0'), with a further null byte after the last
* string. The last string is only null terminated if the whole command
* line is not exceeding (PAGE_SIZE - 1) characters.
*/
cmdlen = 0;
s = cmdline;
while ((count = read(fd, s, pageSize - cmdlen)) > 0) {
cmdlen += count;
s += count;
}
if (count < 0) {
break;
}
// We have to null-terminate because the process may have changed argv[]
// or because the content in /proc/<pid>/cmdline is truncated.
cmdline[cmdlen] = '\0';
if (cmdlen == pageSize && cmdline[pageSize - 1] != '\0') {
truncated = 1;
} else if (cmdlen == 0) {
// /proc/<pid>/cmdline was empty. This usually happens for kernel processes
// like '[kthreadd]'. We could try to read /proc/<pid>/comm in the future.
}
if (cmdlen > 0 && (cmdexe == NULL || truncated)) {
// We have no exact command or the arguments are truncated.
// In this case we save the command line from /proc/<pid>/cmdline.
args = (char*)malloc(pageSize + 1);
if (args != NULL) {
memcpy(args, cmdline, cmdlen + 1);
for (i = 0; i < cmdlen; i++) {
if (args[i] == '\0') {
args[i] = ' ';
}
}
}
}
i = 0;
if (!truncated) {
// Count the arguments
cmdEnd = &cmdline[cmdlen];
for (s = cmdline; *s != '\0' && (s < cmdEnd); i++) {
s += strnlen(s, (cmdEnd - s)) + 1;
}
}
unix_fillArgArray(env, jinfo, i, cmdline, cmdEnd, cmdexe, args);
} while (0);
if (cmdline != NULL) {
free(cmdline);
}
if (args != NULL) {
free(args);
}
if (fd >= 0) {
close(fd);
}
}
/**
* Read the boottime from /proc/stat.
*/
static long long getBoottime(JNIEnv *env) {
FILE *fp;
char *line = NULL;
size_t len = 0;
long long bootTime = 0;
fp = fopen("/proc/stat", "r");
if (fp == NULL) {
return -1;
}
while (getline(&line, &len, fp) != -1) {
if (sscanf(line, "btime %llu", &bootTime) == 1) {
break;
}
}
free(line);
if (fp != 0) {
fclose(fp);
}
return bootTime * 1000;
}

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/*
* Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
/* CopyrightVersion 1.2 */
/* This is a special library that should be loaded before libc &
* libthread to interpose the signal handler installation functions:
* sigaction(), signal(), sigset().
* Used for signal-chaining. See RFE 4381843.
*/
#include <signal.h>
#include <dlfcn.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#define bool int
#define true 1
#define false 0
#define MASK(sig) ((uint64_t)1 << (sig-1)) // 0 is not a signal.
// Check whether all signals fit into jvmsigs. -1 as MASK shifts by -1.
#if (64 < NSIG-1)
#error "Not all signals can be encoded in jvmsigs. Adapt its type!"
#endif
static struct sigaction sact[NSIG]; /* saved signal handlers */
static uint64_t jvmsigs = 0; /* signals used by jvm */
/* used to synchronize the installation of signal handlers */
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
static pthread_t tid = 0;
typedef void (*sa_handler_t)(int);
typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
typedef sa_handler_t (*signal_t)(int, sa_handler_t);
typedef int (*sigaction_t)(int, const struct sigaction *, struct sigaction *);
static signal_t os_signal = 0; /* os's version of signal()/sigset() */
static sigaction_t os_sigaction = 0; /* os's version of sigaction() */
static bool jvm_signal_installing = false;
static bool jvm_signal_installed = false;
static void signal_lock() {
pthread_mutex_lock(&mutex);
/* When the jvm is installing its set of signal handlers, threads
* other than the jvm thread should wait */
if (jvm_signal_installing) {
if (tid != pthread_self()) {
pthread_cond_wait(&cond, &mutex);
}
}
}
static void signal_unlock() {
pthread_mutex_unlock(&mutex);
}
static sa_handler_t call_os_signal(int sig, sa_handler_t disp,
bool is_sigset) {
if (os_signal == NULL) {
if (!is_sigset) {
os_signal = (signal_t)dlsym(RTLD_NEXT, "signal");
} else {
os_signal = (signal_t)dlsym(RTLD_NEXT, "sigset");
}
if (os_signal == NULL) {
printf("%s\n", dlerror());
exit(0);
}
}
return (*os_signal)(sig, disp);
}
static void save_signal_handler(int sig, sa_handler_t disp) {
sigset_t set;
sact[sig].sa_handler = disp;
sigemptyset(&set);
sact[sig].sa_mask = set;
sact[sig].sa_flags = 0;
}
static sa_handler_t set_signal(int sig, sa_handler_t disp, bool is_sigset) {
sa_handler_t oldhandler;
bool sigused;
signal_lock();
sigused = (sig < NSIG) && ((MASK(sig) & jvmsigs) != 0);
if (jvm_signal_installed && sigused) {
/* jvm has installed its signal handler for this signal. */
/* Save the handler. Don't really install it. */
oldhandler = sact[sig].sa_handler;
save_signal_handler(sig, disp);
signal_unlock();
return oldhandler;
} else if (sig < NSIG && jvm_signal_installing) {
/* jvm is installing its signal handlers. Install the new
* handlers and save the old ones. jvm uses sigaction().
* Leave the piece here just in case. */
oldhandler = call_os_signal(sig, disp, is_sigset);
save_signal_handler(sig, oldhandler);
/* Record the signals used by jvm */
jvmsigs |= MASK(sig);
signal_unlock();
return oldhandler;
} else {
/* jvm has no relation with this signal (yet). Install the
* the handler. */
oldhandler = call_os_signal(sig, disp, is_sigset);
signal_unlock();
return oldhandler;
}
}
sa_handler_t signal(int sig, sa_handler_t disp) {
return set_signal(sig, disp, false);
}
sa_handler_t sigset(int sig, sa_handler_t disp) {
return set_signal(sig, disp, true);
}
static int call_os_sigaction(int sig, const struct sigaction *act,
struct sigaction *oact) {
if (os_sigaction == NULL) {
os_sigaction = (sigaction_t)dlsym(RTLD_NEXT, "sigaction");
if (os_sigaction == NULL) {
printf("%s\n", dlerror());
exit(0);
}
}
return (*os_sigaction)(sig, act, oact);
}
int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
int res;
bool sigused;
struct sigaction oldAct;
signal_lock();
sigused = (sig < NSIG) && ((MASK(sig) & jvmsigs) != 0);
if (jvm_signal_installed && sigused) {
/* jvm has installed its signal handler for this signal. */
/* Save the handler. Don't really install it. */
if (oact != NULL) {
*oact = sact[sig];
}
if (act != NULL) {
sact[sig] = *act;
}
signal_unlock();
return 0;
} else if (sig < NSIG && jvm_signal_installing) {
/* jvm is installing its signal handlers. Install the new
* handlers and save the old ones. */
res = call_os_sigaction(sig, act, &oldAct);
sact[sig] = oldAct;
if (oact != NULL) {
*oact = oldAct;
}
/* Record the signals used by jvm */
jvmsigs |= MASK(sig);
signal_unlock();
return res;
} else {
/* jvm has no relation with this signal (yet). Install the
* the handler. */
res = call_os_sigaction(sig, act, oact);
signal_unlock();
return res;
}
}
/* The three functions for the jvm to call into */
void JVM_begin_signal_setting() {
signal_lock();
jvm_signal_installing = true;
tid = pthread_self();
signal_unlock();
}
void JVM_end_signal_setting() {
signal_lock();
jvm_signal_installed = true;
jvm_signal_installing = false;
pthread_cond_broadcast(&cond);
signal_unlock();
}
struct sigaction *JVM_get_signal_action(int sig) {
/* Does race condition make sense here? */
if ((MASK(sig) & jvmsigs) != 0) {
return &sact[sig];
}
return NULL;
}

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/*
* Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/uio.h>
#include <unistd.h>
#include <errno.h>
#include <poll.h>
#include "jvm.h"
#include "net_util.h"
/*
* Stack allocated by thread when doing blocking operation
*/
typedef struct threadEntry {
pthread_t thr; /* this thread */
struct threadEntry *next; /* next thread */
int intr; /* interrupted */
} threadEntry_t;
/*
* Heap allocated during initialized - one entry per fd
*/
typedef struct {
pthread_mutex_t lock; /* fd lock */
threadEntry_t *threads; /* threads blocked on fd */
} fdEntry_t;
/*
* Signal to unblock thread
*/
static int sigWakeup = (__SIGRTMAX - 2);
/*
* fdTable holds one entry per file descriptor, up to a certain
* maximum.
* Theoretically, the number of possible file descriptors can get
* large, though usually it does not. Entries for small value file
* descriptors are kept in a simple table, which covers most scenarios.
* Entries for large value file descriptors are kept in an overflow
* table, which is organized as a sparse two dimensional array whose
* slabs are allocated on demand. This covers all corner cases while
* keeping memory consumption reasonable.
*/
/* Base table for low value file descriptors */
static fdEntry_t* fdTable = NULL;
/* Maximum size of base table (in number of entries). */
static const int fdTableMaxSize = 0x1000; /* 4K */
/* Actual size of base table (in number of entries) */
static int fdTableLen = 0;
/* Max. theoretical number of file descriptors on system. */
static int fdLimit = 0;
/* Overflow table, should base table not be large enough. Organized as
* an array of n slabs, each holding 64k entries.
*/
static fdEntry_t** fdOverflowTable = NULL;
/* Number of slabs in the overflow table */
static int fdOverflowTableLen = 0;
/* Number of entries in one slab */
static const int fdOverflowTableSlabSize = 0x10000; /* 64k */
pthread_mutex_t fdOverflowTableLock = PTHREAD_MUTEX_INITIALIZER;
/*
* Null signal handler
*/
static void sig_wakeup(int sig) {
}
/*
* Initialization routine (executed when library is loaded)
* Allocate fd tables and sets up signal handler.
*/
static void __attribute((constructor)) init() {
struct rlimit nbr_files;
sigset_t sigset;
struct sigaction sa;
int i = 0;
/* Determine the maximum number of possible file descriptors. */
if (-1 == getrlimit(RLIMIT_NOFILE, &nbr_files)) {
fprintf(stderr, "library initialization failed - "
"unable to get max # of allocated fds\n");
abort();
}
if (nbr_files.rlim_max != RLIM_INFINITY) {
fdLimit = nbr_files.rlim_max;
} else {
/* We just do not know. */
fdLimit = INT_MAX;
}
/* Allocate table for low value file descriptors. */
fdTableLen = fdLimit < fdTableMaxSize ? fdLimit : fdTableMaxSize;
fdTable = (fdEntry_t*) calloc(fdTableLen, sizeof(fdEntry_t));
if (fdTable == NULL) {
fprintf(stderr, "library initialization failed - "
"unable to allocate file descriptor table - out of memory");
abort();
} else {
for (i = 0; i < fdTableLen; i ++) {
pthread_mutex_init(&fdTable[i].lock, NULL);
}
}
/* Allocate overflow table, if needed */
if (fdLimit > fdTableMaxSize) {
fdOverflowTableLen = ((fdLimit - fdTableMaxSize) / fdOverflowTableSlabSize) + 1;
fdOverflowTable = (fdEntry_t**) calloc(fdOverflowTableLen, sizeof(fdEntry_t*));
if (fdOverflowTable == NULL) {
fprintf(stderr, "library initialization failed - "
"unable to allocate file descriptor overflow table - out of memory");
abort();
}
}
/*
* Setup the signal handler
*/
sa.sa_handler = sig_wakeup;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sigaction(sigWakeup, &sa, NULL);
sigemptyset(&sigset);
sigaddset(&sigset, sigWakeup);
sigprocmask(SIG_UNBLOCK, &sigset, NULL);
}
/*
* Return the fd table for this fd.
*/
static inline fdEntry_t *getFdEntry(int fd)
{
fdEntry_t* result = NULL;
if (fd < 0) {
return NULL;
}
/* This should not happen. If it does, our assumption about
* max. fd value was wrong. */
assert(fd < fdLimit);
if (fd < fdTableMaxSize) {
/* fd is in base table. */
assert(fd < fdTableLen);
result = &fdTable[fd];
} else {
/* fd is in overflow table. */
const int indexInOverflowTable = fd - fdTableMaxSize;
const int rootindex = indexInOverflowTable / fdOverflowTableSlabSize;
const int slabindex = indexInOverflowTable % fdOverflowTableSlabSize;
fdEntry_t* slab = NULL;
assert(rootindex < fdOverflowTableLen);
assert(slabindex < fdOverflowTableSlabSize);
pthread_mutex_lock(&fdOverflowTableLock);
/* Allocate new slab in overflow table if needed */
if (fdOverflowTable[rootindex] == NULL) {
fdEntry_t* const newSlab =
(fdEntry_t*)calloc(fdOverflowTableSlabSize, sizeof(fdEntry_t));
if (newSlab == NULL) {
fprintf(stderr, "Unable to allocate file descriptor overflow"
" table slab - out of memory");
pthread_mutex_unlock(&fdOverflowTableLock);
abort();
} else {
int i;
for (i = 0; i < fdOverflowTableSlabSize; i ++) {
pthread_mutex_init(&newSlab[i].lock, NULL);
}
fdOverflowTable[rootindex] = newSlab;
}
}
pthread_mutex_unlock(&fdOverflowTableLock);
slab = fdOverflowTable[rootindex];
result = &slab[slabindex];
}
return result;
}
/*
* Start a blocking operation :-
* Insert thread onto thread list for the fd.
*/
static inline void startOp(fdEntry_t *fdEntry, threadEntry_t *self)
{
self->thr = pthread_self();
self->intr = 0;
pthread_mutex_lock(&(fdEntry->lock));
{
self->next = fdEntry->threads;
fdEntry->threads = self;
}
pthread_mutex_unlock(&(fdEntry->lock));
}
/*
* End a blocking operation :-
* Remove thread from thread list for the fd
* If fd has been interrupted then set errno to EBADF
*/
static inline void endOp
(fdEntry_t *fdEntry, threadEntry_t *self)
{
int orig_errno = errno;
pthread_mutex_lock(&(fdEntry->lock));
{
threadEntry_t *curr, *prev=NULL;
curr = fdEntry->threads;
while (curr != NULL) {
if (curr == self) {
if (curr->intr) {
orig_errno = EBADF;
}
if (prev == NULL) {
fdEntry->threads = curr->next;
} else {
prev->next = curr->next;
}
break;
}
prev = curr;
curr = curr->next;
}
}
pthread_mutex_unlock(&(fdEntry->lock));
errno = orig_errno;
}
/*
* Close or dup2 a file descriptor ensuring that all threads blocked on
* the file descriptor are notified via a wakeup signal.
*
* fd1 < 0 => close(fd2)
* fd1 >= 0 => dup2(fd1, fd2)
*
* Returns -1 with errno set if operation fails.
*/
static int closefd(int fd1, int fd2) {
int rv, orig_errno;
fdEntry_t *fdEntry = getFdEntry(fd2);
if (fdEntry == NULL) {
errno = EBADF;
return -1;
}
/*
* Lock the fd to hold-off additional I/O on this fd.
*/
pthread_mutex_lock(&(fdEntry->lock));
{
/*
* And close/dup the file descriptor
* (restart if interrupted by signal)
*/
do {
if (fd1 < 0) {
rv = close(fd2);
} else {
rv = dup2(fd1, fd2);
}
} while (rv == -1 && errno == EINTR);
/*
* Send a wakeup signal to all threads blocked on this
* file descriptor.
*/
threadEntry_t *curr = fdEntry->threads;
while (curr != NULL) {
curr->intr = 1;
pthread_kill( curr->thr, sigWakeup );
curr = curr->next;
}
}
/*
* Unlock without destroying errno
*/
orig_errno = errno;
pthread_mutex_unlock(&(fdEntry->lock));
errno = orig_errno;
return rv;
}
/*
* Wrapper for dup2 - same semantics as dup2 system call except
* that any threads blocked in an I/O system call on fd2 will be
* preempted and return -1/EBADF;
*/
int NET_Dup2(int fd, int fd2) {
if (fd < 0) {
errno = EBADF;
return -1;
}
return closefd(fd, fd2);
}
/*
* Wrapper for close - same semantics as close system call
* except that any threads blocked in an I/O on fd will be
* preempted and the I/O system call will return -1/EBADF.
*/
int NET_SocketClose(int fd) {
return closefd(-1, fd);
}
/************** Basic I/O operations here ***************/
/*
* Macro to perform a blocking IO operation. Restarts
* automatically if interrupted by signal (other than
* our wakeup signal)
*/
#define BLOCKING_IO_RETURN_INT(FD, FUNC) { \
int ret; \
threadEntry_t self; \
fdEntry_t *fdEntry = getFdEntry(FD); \
if (fdEntry == NULL) { \
errno = EBADF; \
return -1; \
} \
do { \
startOp(fdEntry, &self); \
ret = FUNC; \
endOp(fdEntry, &self); \
} while (ret == -1 && errno == EINTR); \
return ret; \
}
int NET_Read(int s, void* buf, size_t len) {
BLOCKING_IO_RETURN_INT( s, recv(s, buf, len, 0) );
}
int NET_NonBlockingRead(int s, void* buf, size_t len) {
BLOCKING_IO_RETURN_INT( s, recv(s, buf, len, MSG_DONTWAIT) );
}
int NET_ReadV(int s, const struct iovec * vector, int count) {
BLOCKING_IO_RETURN_INT( s, readv(s, vector, count) );
}
int NET_RecvFrom(int s, void *buf, int len, unsigned int flags,
struct sockaddr *from, socklen_t *fromlen) {
BLOCKING_IO_RETURN_INT( s, recvfrom(s, buf, len, flags, from, fromlen) );
}
int NET_Send(int s, void *msg, int len, unsigned int flags) {
BLOCKING_IO_RETURN_INT( s, send(s, msg, len, flags) );
}
int NET_WriteV(int s, const struct iovec * vector, int count) {
BLOCKING_IO_RETURN_INT( s, writev(s, vector, count) );
}
int NET_SendTo(int s, const void *msg, int len, unsigned int
flags, const struct sockaddr *to, int tolen) {
BLOCKING_IO_RETURN_INT( s, sendto(s, msg, len, flags, to, tolen) );
}
int NET_Accept(int s, struct sockaddr *addr, socklen_t *addrlen) {
BLOCKING_IO_RETURN_INT( s, accept(s, addr, addrlen) );
}
int NET_Connect(int s, struct sockaddr *addr, int addrlen) {
BLOCKING_IO_RETURN_INT( s, connect(s, addr, addrlen) );
}
int NET_Poll(struct pollfd *ufds, unsigned int nfds, int timeout) {
BLOCKING_IO_RETURN_INT( ufds[0].fd, poll(ufds, nfds, timeout) );
}
/*
* Wrapper for poll(s, timeout).
* Auto restarts with adjusted timeout if interrupted by
* signal other than our wakeup signal.
*/
int NET_Timeout(JNIEnv *env, int s, long timeout, jlong nanoTimeStamp) {
jlong prevNanoTime = nanoTimeStamp;
jlong nanoTimeout = (jlong)timeout * NET_NSEC_PER_MSEC;
fdEntry_t *fdEntry = getFdEntry(s);
/*
* Check that fd hasn't been closed.
*/
if (fdEntry == NULL) {
errno = EBADF;
return -1;
}
for(;;) {
struct pollfd pfd;
int rv;
threadEntry_t self;
/*
* Poll the fd. If interrupted by our wakeup signal
* errno will be set to EBADF.
*/
pfd.fd = s;
pfd.events = POLLIN | POLLERR;
startOp(fdEntry, &self);
rv = poll(&pfd, 1, nanoTimeout / NET_NSEC_PER_MSEC);
endOp(fdEntry, &self);
/*
* If interrupted then adjust timeout. If timeout
* has expired return 0 (indicating timeout expired).
*/
if (rv < 0 && errno == EINTR) {
jlong newNanoTime = JVM_NanoTime(env, 0);
nanoTimeout -= newNanoTime - prevNanoTime;
if (nanoTimeout < NET_NSEC_PER_MSEC) {
return 0;
}
prevNanoTime = newNanoTime;
} else {
return rv;
}
}
}

97
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/*
* Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "jni.h"
#include "jni_util.h"
#include "jvm.h"
#include "jlong.h"
#include "nio_util.h"
#include "sun_nio_ch_EPoll.h"
#include <dlfcn.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/epoll.h>
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_eventSize(JNIEnv* env, jclass this)
{
return sizeof(struct epoll_event);
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_eventsOffset(JNIEnv* env, jclass this)
{
return offsetof(struct epoll_event, events);
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_dataOffset(JNIEnv* env, jclass this)
{
return offsetof(struct epoll_event, data);
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_epollCreate(JNIEnv *env, jclass c) {
/*
* epoll_create expects a size as a hint to the kernel about how to
* dimension internal structures. We can't predict the size in advance.
*/
int epfd = epoll_create(256);
if (epfd < 0) {
JNU_ThrowIOExceptionWithLastError(env, "epoll_create failed");
}
return epfd;
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_epollCtl(JNIEnv *env, jclass c, jint epfd,
jint opcode, jint fd, jint events)
{
struct epoll_event event;
int res;
event.events = events;
event.data.fd = fd;
RESTARTABLE(epoll_ctl(epfd, (int)opcode, (int)fd, &event), res);
return (res == 0) ? 0 : errno;
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPoll_epollWait(JNIEnv *env, jclass c,
jint epfd, jlong address, jint numfds)
{
struct epoll_event *events = jlong_to_ptr(address);
int res;
RESTARTABLE(epoll_wait(epfd, events, numfds, -1), res);
if (res < 0) {
JNU_ThrowIOExceptionWithLastError(env, "epoll_wait failed");
}
return res;
}

160
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@ -0,0 +1,160 @@
/*
* Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "jni.h"
#include "jni_util.h"
#include "jvm.h"
#include "jlong.h"
#include "sun_nio_ch_EPollArrayWrapper.h"
#include <unistd.h>
#include <sys/time.h>
#include <sys/epoll.h>
#define RESTARTABLE(_cmd, _result) do { \
do { \
_result = _cmd; \
} while((_result == -1) && (errno == EINTR)); \
} while(0)
static int
iepoll(int epfd, struct epoll_event *events, int numfds, jlong timeout)
{
jlong start, now;
int remaining = timeout;
struct timeval t;
int diff;
gettimeofday(&t, NULL);
start = t.tv_sec * 1000 + t.tv_usec / 1000;
for (;;) {
int res = epoll_wait(epfd, events, numfds, remaining);
if (res < 0 && errno == EINTR) {
if (remaining >= 0) {
gettimeofday(&t, NULL);
now = t.tv_sec * 1000 + t.tv_usec / 1000;
diff = now - start;
remaining -= diff;
if (diff < 0 || remaining <= 0) {
return 0;
}
start = now;
}
} else {
return res;
}
}
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_EPollArrayWrapper_init(JNIEnv *env, jclass this)
{
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPollArrayWrapper_epollCreate(JNIEnv *env, jobject this)
{
/*
* epoll_create expects a size as a hint to the kernel about how to
* dimension internal structures. We can't predict the size in advance.
*/
int epfd = epoll_create(256);
if (epfd < 0) {
JNU_ThrowIOExceptionWithLastError(env, "epoll_create failed");
}
return epfd;
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPollArrayWrapper_sizeofEPollEvent(JNIEnv* env, jclass this)
{
return sizeof(struct epoll_event);
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPollArrayWrapper_offsetofData(JNIEnv* env, jclass this)
{
return offsetof(struct epoll_event, data);
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_EPollArrayWrapper_epollCtl(JNIEnv *env, jobject this, jint epfd,
jint opcode, jint fd, jint events)
{
struct epoll_event event;
int res;
event.events = events;
event.data.fd = fd;
RESTARTABLE(epoll_ctl(epfd, (int)opcode, (int)fd, &event), res);
/*
* A channel may be registered with several Selectors. When each Selector
* is polled a EPOLL_CTL_DEL op will be inserted into its pending update
* list to remove the file descriptor from epoll. The "last" Selector will
* close the file descriptor which automatically unregisters it from each
* epoll descriptor. To avoid costly synchronization between Selectors we
* allow pending updates to be processed, ignoring errors. The errors are
* harmless as the last update for the file descriptor is guaranteed to
* be EPOLL_CTL_DEL.
*/
if (res < 0 && errno != EBADF && errno != ENOENT && errno != EPERM) {
JNU_ThrowIOExceptionWithLastError(env, "epoll_ctl failed");
}
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_EPollArrayWrapper_epollWait(JNIEnv *env, jobject this,
jlong address, jint numfds,
jlong timeout, jint epfd)
{
struct epoll_event *events = jlong_to_ptr(address);
int res;
if (timeout <= 0) { /* Indefinite or no wait */
RESTARTABLE(epoll_wait(epfd, events, numfds, timeout), res);
} else { /* Bounded wait; bounded restarts */
res = iepoll(epfd, events, numfds, timeout);
}
if (res < 0) {
JNU_ThrowIOExceptionWithLastError(env, "epoll_wait failed");
}
return res;
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_EPollArrayWrapper_interrupt(JNIEnv *env, jobject this, jint fd)
{
int fakebuf[1];
fakebuf[0] = 1;
if (write(fd, fakebuf, 1) < 0) {
JNU_ThrowIOExceptionWithLastError(env,"write to interrupt fd failed");
}
}

76
src/java.base/linux/native/libnio/ch/EPollPort.c Normal file
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/*
* Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "jni.h"
#include "jni_util.h"
#include "jvm.h"
#include "jlong.h"
#include "nio_util.h"
#include "sun_nio_ch_EPollPort.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
JNIEXPORT void JNICALL
Java_sun_nio_ch_EPollPort_socketpair(JNIEnv* env, jclass clazz, jintArray sv) {
int sp[2];
if (socketpair(PF_UNIX, SOCK_STREAM, 0, sp) == -1) {
JNU_ThrowIOExceptionWithLastError(env, "socketpair failed");
} else {
jint res[2];
res[0] = (jint)sp[0];
res[1] = (jint)sp[1];
(*env)->SetIntArrayRegion(env, sv, 0, 2, &res[0]);
}
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_EPollPort_interrupt(JNIEnv *env, jclass c, jint fd) {
int res;
int buf[1];
buf[0] = 1;
RESTARTABLE(write(fd, buf, 1), res);
if (res < 0) {
JNU_ThrowIOExceptionWithLastError(env, "write failed");
}
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_EPollPort_drain1(JNIEnv *env, jclass cl, jint fd) {
int res;
char buf[1];
RESTARTABLE(read(fd, buf, 1), res);
if (res < 0) {
JNU_ThrowIOExceptionWithLastError(env, "drain1 failed");
}
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_EPollPort_close0(JNIEnv *env, jclass c, jint fd) {
int res;
RESTARTABLE(close(fd), res);
}

232
src/java.base/linux/native/libnio/fs/LinuxNativeDispatcher.c Normal file
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/*
* Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "jni.h"
#include "jni_util.h"
#include "jvm.h"
#include "jlong.h"
#include <stdio.h>
#include <string.h>
#include <dlfcn.h>
#include <errno.h>
#include <mntent.h>
#include "sun_nio_fs_LinuxNativeDispatcher.h"
typedef size_t fgetxattr_func(int fd, const char* name, void* value, size_t size);
typedef int fsetxattr_func(int fd, const char* name, void* value, size_t size, int flags);
typedef int fremovexattr_func(int fd, const char* name);
typedef int flistxattr_func(int fd, char* list, size_t size);
fgetxattr_func* my_fgetxattr_func = NULL;
fsetxattr_func* my_fsetxattr_func = NULL;
fremovexattr_func* my_fremovexattr_func = NULL;
flistxattr_func* my_flistxattr_func = NULL;
static jfieldID entry_name;
static jfieldID entry_dir;
static jfieldID entry_fstype;
static jfieldID entry_options;
static void throwUnixException(JNIEnv* env, int errnum) {
jobject x = JNU_NewObjectByName(env, "sun/nio/fs/UnixException",
"(I)V", errnum);
if (x != NULL) {
(*env)->Throw(env, x);
}
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_LinuxNativeDispatcher_init(JNIEnv *env, jclass clazz)
{
my_fgetxattr_func = (fgetxattr_func*)dlsym(RTLD_DEFAULT, "fgetxattr");
my_fsetxattr_func = (fsetxattr_func*)dlsym(RTLD_DEFAULT, "fsetxattr");
my_fremovexattr_func = (fremovexattr_func*)dlsym(RTLD_DEFAULT, "fremovexattr");
my_flistxattr_func = (flistxattr_func*)dlsym(RTLD_DEFAULT, "flistxattr");
clazz = (*env)->FindClass(env, "sun/nio/fs/UnixMountEntry");
CHECK_NULL(clazz);
entry_name = (*env)->GetFieldID(env, clazz, "name", "[B");
CHECK_NULL(entry_name);
entry_dir = (*env)->GetFieldID(env, clazz, "dir", "[B");
CHECK_NULL(entry_dir);
entry_fstype = (*env)->GetFieldID(env, clazz, "fstype", "[B");
CHECK_NULL(entry_fstype);
entry_options = (*env)->GetFieldID(env, clazz, "opts", "[B");
CHECK_NULL(entry_options);
}
JNIEXPORT jint JNICALL
Java_sun_nio_fs_LinuxNativeDispatcher_fgetxattr0(JNIEnv* env, jclass clazz,
jint fd, jlong nameAddress, jlong valueAddress, jint valueLen)
{
size_t res = -1;
const char* name = jlong_to_ptr(nameAddress);
void* value = jlong_to_ptr(valueAddress);
if (my_fgetxattr_func == NULL) {
errno = ENOTSUP;
} else {
/* EINTR not documented */
res = (*my_fgetxattr_func)(fd, name, value, valueLen);
}
if (res == (size_t)-1)
throwUnixException(env, errno);
return (jint)res;
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_LinuxNativeDispatcher_fsetxattr0(JNIEnv* env, jclass clazz,
jint fd, jlong nameAddress, jlong valueAddress, jint valueLen)
{
int res = -1;
const char* name = jlong_to_ptr(nameAddress);
void* value = jlong_to_ptr(valueAddress);
if (my_fsetxattr_func == NULL) {
errno = ENOTSUP;
} else {
/* EINTR not documented */
res = (*my_fsetxattr_func)(fd, name, value, valueLen, 0);
}
if (res == -1)
throwUnixException(env, errno);
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_LinuxNativeDispatcher_fremovexattr0(JNIEnv* env, jclass clazz,
jint fd, jlong nameAddress)
{
int res = -1;
const char* name = jlong_to_ptr(nameAddress);
if (my_fremovexattr_func == NULL) {
errno = ENOTSUP;
} else {
/* EINTR not documented */
res = (*my_fremovexattr_func)(fd, name);
}
if (res == -1)
throwUnixException(env, errno);
}
JNIEXPORT jint JNICALL
Java_sun_nio_fs_LinuxNativeDispatcher_flistxattr(JNIEnv* env, jclass clazz,
jint fd, jlong listAddress, jint size)
{
size_t res = -1;
char* list = jlong_to_ptr(listAddress);
if (my_flistxattr_func == NULL) {
errno = ENOTSUP;
} else {
/* EINTR not documented */
res = (*my_flistxattr_func)(fd, list, (size_t)size);
}
if (res == (size_t)-1)
throwUnixException(env, errno);
return (jint)res;
}
JNIEXPORT jlong JNICALL
Java_sun_nio_fs_LinuxNativeDispatcher_setmntent0(JNIEnv* env, jclass this, jlong pathAddress,
jlong modeAddress)
{
FILE* fp = NULL;
const char* path = (const char*)jlong_to_ptr(pathAddress);
const char* mode = (const char*)jlong_to_ptr(modeAddress);
do {
fp = setmntent(path, mode);
} while (fp == NULL && errno == EINTR);
if (fp == NULL) {
throwUnixException(env, errno);
}
return ptr_to_jlong(fp);
}
JNIEXPORT jint JNICALL
Java_sun_nio_fs_LinuxNativeDispatcher_getmntent(JNIEnv* env, jclass this,
jlong value, jobject entry)
{
struct mntent ent;
char buf[1024];
int buflen = sizeof(buf);
struct mntent* m;
FILE* fp = jlong_to_ptr(value);
jsize len;
jbyteArray bytes;
char* name;
char* dir;
char* fstype;
char* options;
m = getmntent_r(fp, &ent, (char*)&buf, buflen);
if (m == NULL)
return -1;
name = m->mnt_fsname;
dir = m->mnt_dir;
fstype = m->mnt_type;
options = m->mnt_opts;
len = strlen(name);
bytes = (*env)->NewByteArray(env, len);
if (bytes == NULL)
return -1;
(*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)name);
(*env)->SetObjectField(env, entry, entry_name, bytes);
len = strlen(dir);
bytes = (*env)->NewByteArray(env, len);
if (bytes == NULL)
return -1;
(*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)dir);
(*env)->SetObjectField(env, entry, entry_dir, bytes);
len = strlen(fstype);
bytes = (*env)->NewByteArray(env, len);
if (bytes == NULL)
return -1;
(*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)fstype);
(*env)->SetObjectField(env, entry, entry_fstype, bytes);
len = strlen(options);
bytes = (*env)->NewByteArray(env, len);
if (bytes == NULL)
return -1;
(*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte*)options);
(*env)->SetObjectField(env, entry, entry_options, bytes);
return 0;
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_LinuxNativeDispatcher_endmntent(JNIEnv* env, jclass this, jlong stream)
{
FILE* fp = jlong_to_ptr(stream);
/* FIXME - man page doesn't explain how errors are returned */
endmntent(fp);
}

153
src/java.base/linux/native/libnio/fs/LinuxWatchService.c Normal file
View file

@ -0,0 +1,153 @@
/*
* Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include "jni.h"
#include "jni_util.h"
#include "jvm.h"
#include "jlong.h"
#include <stdlib.h>
#include <dlfcn.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <poll.h>
#include <sys/inotify.h>
#include "sun_nio_fs_LinuxWatchService.h"
static void throwUnixException(JNIEnv* env, int errnum) {
jobject x = JNU_NewObjectByName(env, "sun/nio/fs/UnixException",
"(I)V", errnum);
if (x != NULL) {
(*env)->Throw(env, x);
}
}
JNIEXPORT jint JNICALL
Java_sun_nio_fs_LinuxWatchService_eventSize(JNIEnv *env, jclass clazz)
{
return (jint)sizeof(struct inotify_event);
}
JNIEXPORT jintArray JNICALL
Java_sun_nio_fs_LinuxWatchService_eventOffsets(JNIEnv *env, jclass clazz)
{
jintArray result = (*env)->NewIntArray(env, 5);
if (result != NULL) {
jint arr[5];
arr[0] = (jint)offsetof(struct inotify_event, wd);
arr[1] = (jint)offsetof(struct inotify_event, mask);
arr[2] = (jint)offsetof(struct inotify_event, cookie);
arr[3] = (jint)offsetof(struct inotify_event, len);
arr[4] = (jint)offsetof(struct inotify_event, name);
(*env)->SetIntArrayRegion(env, result, 0, 5, arr);
}
return result;
}
JNIEXPORT jint JNICALL
Java_sun_nio_fs_LinuxWatchService_inotifyInit
(JNIEnv* env, jclass clazz)
{
int ifd = inotify_init();
if (ifd == -1) {
throwUnixException(env, errno);
}
return (jint)ifd;
}
JNIEXPORT jint JNICALL
Java_sun_nio_fs_LinuxWatchService_inotifyAddWatch
(JNIEnv* env, jclass clazz, jint fd, jlong address, jint mask)
{
int wfd = -1;
const char* path = (const char*)jlong_to_ptr(address);
wfd = inotify_add_watch((int)fd, path, mask);
if (wfd == -1) {
throwUnixException(env, errno);
}
return (jint)wfd;
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_LinuxWatchService_inotifyRmWatch
(JNIEnv* env, jclass clazz, jint fd, jint wd)
{
int err = inotify_rm_watch((int)fd, (int)wd);
if (err == -1)
throwUnixException(env, errno);
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_LinuxWatchService_configureBlocking
(JNIEnv* env, jclass clazz, jint fd, jboolean blocking)
{
int flags = fcntl(fd, F_GETFL);
if ((blocking == JNI_FALSE) && !(flags & O_NONBLOCK))
fcntl(fd, F_SETFL, flags | O_NONBLOCK);
else if ((blocking == JNI_TRUE) && (flags & O_NONBLOCK))
fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_LinuxWatchService_socketpair
(JNIEnv* env, jclass clazz, jintArray sv)
{
int sp[2];
if (socketpair(PF_UNIX, SOCK_STREAM, 0, sp) == -1) {
throwUnixException(env, errno);
} else {
jint res[2];
res[0] = (jint)sp[0];
res[1] = (jint)sp[1];
(*env)->SetIntArrayRegion(env, sv, 0, 2, &res[0]);
}
}
JNIEXPORT jint JNICALL
Java_sun_nio_fs_LinuxWatchService_poll
(JNIEnv* env, jclass clazz, jint fd1, jint fd2)
{
struct pollfd ufds[2];
int n;
ufds[0].fd = fd1;
ufds[0].events = POLLIN;
ufds[1].fd = fd2;
ufds[1].events = POLLIN;
n = poll(&ufds[0], 2, -1);
if (n == -1) {
if (errno == EINTR) {
n = 0;
} else {
throwUnixException(env, errno);
}
}
return (jint)n;
}