1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
* 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 {
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 {
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 {
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 {
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 {
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 {
// 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 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);
}
}
|
