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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package libcore.io;
import dalvik.system.BlockGuard;
import dalvik.system.SocketTagger;
import java.io.FileDescriptor;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketException;
import java.nio.ByteBuffer;
import static libcore.io.OsConstants.*;
/**
* Informs BlockGuard of any activity it should be aware of.
*/
public class BlockGuardOs extends ForwardingOs {
public BlockGuardOs(Os os) {
super(os);
}
private FileDescriptor tagSocket(FileDescriptor fd) throws ErrnoException {
try {
SocketTagger.get().tag(fd);
return fd;
} catch (SocketException e) {
throw new ErrnoException("socket", EINVAL, e);
}
}
private void untagSocket(FileDescriptor fd) throws ErrnoException {
try {
SocketTagger.get().untag(fd);
} catch (SocketException e) {
throw new ErrnoException("socket", EINVAL, e);
}
}
@Override public FileDescriptor accept(FileDescriptor fd, InetSocketAddress peerAddress) throws ErrnoException, SocketException {
BlockGuard.getThreadPolicy().onNetwork();
return tagSocket(os.accept(fd, peerAddress));
}
@Override public void close(FileDescriptor fd) throws ErrnoException {
try {
if (S_ISSOCK(Libcore.os.fstat(fd).st_mode)) {
if (isLingerSocket(fd)) {
// If the fd is a socket with SO_LINGER set, we might block indefinitely.
// We allow non-linger sockets so that apps can close their network
// connections in methods like onDestroy which will run on the UI thread.
BlockGuard.getThreadPolicy().onNetwork();
}
untagSocket(fd);
}
} catch (ErrnoException ignored) {
// We're called via Socket.close (which doesn't ask for us to be called), so we
// must not throw here, because Socket.close must not throw if asked to close an
// already-closed socket. Also, the passed-in FileDescriptor isn't necessarily
// a socket at all.
}
os.close(fd);
}
private static boolean isLingerSocket(FileDescriptor fd) throws ErrnoException {
StructLinger linger = Libcore.os.getsockoptLinger(fd, SOL_SOCKET, SO_LINGER);
return linger.isOn() && linger.l_linger > 0;
}
@Override public void connect(FileDescriptor fd, InetAddress address, int port) throws ErrnoException, SocketException {
BlockGuard.getThreadPolicy().onNetwork();
os.connect(fd, address, port);
}
// TODO: Untag newFd when needed for dup2(FileDescriptor oldFd, int newFd)
@Override public void fdatasync(FileDescriptor fd) throws ErrnoException {
BlockGuard.getThreadPolicy().onWriteToDisk();
os.fdatasync(fd);
}
@Override public void fsync(FileDescriptor fd) throws ErrnoException {
BlockGuard.getThreadPolicy().onWriteToDisk();
os.fsync(fd);
}
@Override public void ftruncate(FileDescriptor fd, long length) throws ErrnoException {
BlockGuard.getThreadPolicy().onWriteToDisk();
os.ftruncate(fd, length);
}
@Override public FileDescriptor open(String path, int flags, int mode) throws ErrnoException {
BlockGuard.getThreadPolicy().onReadFromDisk();
if ((mode & O_ACCMODE) != O_RDONLY) {
BlockGuard.getThreadPolicy().onWriteToDisk();
}
return os.open(path, flags, mode);
}
@Override public int poll(StructPollfd[] fds, int timeoutMs) throws ErrnoException {
// Greater than 0 is a timeout in milliseconds and -1 means "block forever",
// but 0 means "poll and return immediately", which shouldn't be subject to BlockGuard.
if (timeoutMs != 0) {
BlockGuard.getThreadPolicy().onNetwork();
}
return os.poll(fds, timeoutMs);
}
@Override public int pread(FileDescriptor fd, ByteBuffer buffer, long offset) throws ErrnoException {
BlockGuard.getThreadPolicy().onReadFromDisk();
return os.pread(fd, buffer, offset);
}
@Override public int pread(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, long offset) throws ErrnoException {
BlockGuard.getThreadPolicy().onReadFromDisk();
return os.pread(fd, bytes, byteOffset, byteCount, offset);
}
@Override public int pwrite(FileDescriptor fd, ByteBuffer buffer, long offset) throws ErrnoException {
BlockGuard.getThreadPolicy().onWriteToDisk();
return os.pwrite(fd, buffer, offset);
}
@Override public int pwrite(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, long offset) throws ErrnoException {
BlockGuard.getThreadPolicy().onWriteToDisk();
return os.pwrite(fd, bytes, byteOffset, byteCount, offset);
}
@Override public int read(FileDescriptor fd, ByteBuffer buffer) throws ErrnoException {
BlockGuard.getThreadPolicy().onReadFromDisk();
return os.read(fd, buffer);
}
@Override public int read(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount) throws ErrnoException {
BlockGuard.getThreadPolicy().onReadFromDisk();
return os.read(fd, bytes, byteOffset, byteCount);
}
@Override public int readv(FileDescriptor fd, Object[] buffers, int[] offsets, int[] byteCounts) throws ErrnoException {
BlockGuard.getThreadPolicy().onReadFromDisk();
return os.readv(fd, buffers, offsets, byteCounts);
}
@Override public int recvfrom(FileDescriptor fd, ByteBuffer buffer, int flags, InetSocketAddress srcAddress) throws ErrnoException, SocketException {
BlockGuard.getThreadPolicy().onNetwork();
return os.recvfrom(fd, buffer, flags, srcAddress);
}
@Override public int recvfrom(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, int flags, InetSocketAddress srcAddress) throws ErrnoException, SocketException {
BlockGuard.getThreadPolicy().onNetwork();
return os.recvfrom(fd, bytes, byteOffset, byteCount, flags, srcAddress);
}
@Override public int sendto(FileDescriptor fd, ByteBuffer buffer, int flags, InetAddress inetAddress, int port) throws ErrnoException, SocketException {
BlockGuard.getThreadPolicy().onNetwork();
return os.sendto(fd, buffer, flags, inetAddress, port);
}
@Override public int sendto(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, int flags, InetAddress inetAddress, int port) throws ErrnoException, SocketException {
// We permit datagrams without hostname lookups.
if (inetAddress != null) {
BlockGuard.getThreadPolicy().onNetwork();
}
return os.sendto(fd, bytes, byteOffset, byteCount, flags, inetAddress, port);
}
@Override public FileDescriptor socket(int domain, int type, int protocol) throws ErrnoException {
return tagSocket(os.socket(domain, type, protocol));
}
@Override public void socketpair(int domain, int type, int protocol, FileDescriptor fd1, FileDescriptor fd2) throws ErrnoException {
os.socketpair(domain, type, protocol, fd1, fd2);
tagSocket(fd1);
tagSocket(fd2);
}
@Override public int write(FileDescriptor fd, ByteBuffer buffer) throws ErrnoException {
BlockGuard.getThreadPolicy().onWriteToDisk();
return os.write(fd, buffer);
}
@Override public int write(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount) throws ErrnoException {
BlockGuard.getThreadPolicy().onWriteToDisk();
return os.write(fd, bytes, byteOffset, byteCount);
}
@Override public int writev(FileDescriptor fd, Object[] buffers, int[] offsets, int[] byteCounts) throws ErrnoException {
BlockGuard.getThreadPolicy().onWriteToDisk();
return os.writev(fd, buffers, offsets, byteCounts);
}
}
