1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package libcore.io;
18
19import android.system.ErrnoException;
20import android.system.GaiException;
21import android.system.StructAddrinfo;
22import android.system.StructFlock;
23import android.system.StructGroupReq;
24import android.system.StructGroupSourceReq;
25import android.system.StructLinger;
26import android.system.StructPasswd;
27import android.system.StructPollfd;
28import android.system.StructStat;
29import android.system.StructStatVfs;
30import android.system.StructTimeval;
31import android.system.StructUcred;
32import android.system.StructUtsname;
33import android.util.MutableInt;
34import android.util.MutableLong;
35import java.io.FileDescriptor;
36import java.io.InterruptedIOException;
37import java.net.InetAddress;
38import java.net.InetSocketAddress;
39import java.net.SocketAddress;
40import java.net.SocketException;
41import java.nio.ByteBuffer;
42import java.nio.NioUtils;
43
44public final class Posix implements Os {
45    Posix() { }
46
47    public native FileDescriptor accept(FileDescriptor fd, InetSocketAddress peerAddress) throws ErrnoException, SocketException;
48    public native boolean access(String path, int mode) throws ErrnoException;
49    public native InetAddress[] android_getaddrinfo(String node, StructAddrinfo hints, int netId) throws GaiException;
50    public native void bind(FileDescriptor fd, InetAddress address, int port) throws ErrnoException, SocketException;
51    public native void bind(FileDescriptor fd, SocketAddress address) throws ErrnoException, SocketException;
52    public native void chmod(String path, int mode) throws ErrnoException;
53    public native void chown(String path, int uid, int gid) throws ErrnoException;
54    public native void close(FileDescriptor fd) throws ErrnoException;
55    public native void connect(FileDescriptor fd, InetAddress address, int port) throws ErrnoException, SocketException;
56    public native void connect(FileDescriptor fd, SocketAddress address) throws ErrnoException, SocketException;
57    public native FileDescriptor dup(FileDescriptor oldFd) throws ErrnoException;
58    public native FileDescriptor dup2(FileDescriptor oldFd, int newFd) throws ErrnoException;
59    public native String[] environ();
60    public native void execv(String filename, String[] argv) throws ErrnoException;
61    public native void execve(String filename, String[] argv, String[] envp) throws ErrnoException;
62    public native void fchmod(FileDescriptor fd, int mode) throws ErrnoException;
63    public native void fchown(FileDescriptor fd, int uid, int gid) throws ErrnoException;
64    public native int fcntlFlock(FileDescriptor fd, int cmd, StructFlock arg) throws ErrnoException, InterruptedIOException;
65    public native int fcntlInt(FileDescriptor fd, int cmd, int arg) throws ErrnoException;
66    public native int fcntlVoid(FileDescriptor fd, int cmd) throws ErrnoException;
67    public native void fdatasync(FileDescriptor fd) throws ErrnoException;
68    public native StructStat fstat(FileDescriptor fd) throws ErrnoException;
69    public native StructStatVfs fstatvfs(FileDescriptor fd) throws ErrnoException;
70    public native void fsync(FileDescriptor fd) throws ErrnoException;
71    public native void ftruncate(FileDescriptor fd, long length) throws ErrnoException;
72    public native String gai_strerror(int error);
73    public native int getegid();
74    public native int geteuid();
75    public native int getgid();
76    public native String getenv(String name);
77    public native String getnameinfo(InetAddress address, int flags) throws GaiException;
78    public native SocketAddress getpeername(FileDescriptor fd) throws ErrnoException;
79    public native int getpgid(int pid);
80    public native int getpid();
81    public native int getppid();
82    public native StructPasswd getpwnam(String name) throws ErrnoException;
83    public native StructPasswd getpwuid(int uid) throws ErrnoException;
84    public native SocketAddress getsockname(FileDescriptor fd) throws ErrnoException;
85    public native int getsockoptByte(FileDescriptor fd, int level, int option) throws ErrnoException;
86    public native InetAddress getsockoptInAddr(FileDescriptor fd, int level, int option) throws ErrnoException;
87    public native int getsockoptInt(FileDescriptor fd, int level, int option) throws ErrnoException;
88    public native StructLinger getsockoptLinger(FileDescriptor fd, int level, int option) throws ErrnoException;
89    public native StructTimeval getsockoptTimeval(FileDescriptor fd, int level, int option) throws ErrnoException;
90    public native StructUcred getsockoptUcred(FileDescriptor fd, int level, int option) throws ErrnoException;
91    public native int gettid();
92    public native int getuid();
93    public native int getxattr(String path, String name, byte[] outValue) throws ErrnoException;
94    public native String if_indextoname(int index);
95    public native InetAddress inet_pton(int family, String address);
96    public native InetAddress ioctlInetAddress(FileDescriptor fd, int cmd, String interfaceName) throws ErrnoException;
97    public native int ioctlInt(FileDescriptor fd, int cmd, MutableInt arg) throws ErrnoException;
98    public native boolean isatty(FileDescriptor fd);
99    public native void kill(int pid, int signal) throws ErrnoException;
100    public native void lchown(String path, int uid, int gid) throws ErrnoException;
101    public native void link(String oldPath, String newPath) throws ErrnoException;
102    public native void listen(FileDescriptor fd, int backlog) throws ErrnoException;
103    public native long lseek(FileDescriptor fd, long offset, int whence) throws ErrnoException;
104    public native StructStat lstat(String path) throws ErrnoException;
105    public native void mincore(long address, long byteCount, byte[] vector) throws ErrnoException;
106    public native void mkdir(String path, int mode) throws ErrnoException;
107    public native void mkfifo(String path, int mode) throws ErrnoException;
108    public native void mlock(long address, long byteCount) throws ErrnoException;
109    public native long mmap(long address, long byteCount, int prot, int flags, FileDescriptor fd, long offset) throws ErrnoException;
110    public native void msync(long address, long byteCount, int flags) throws ErrnoException;
111    public native void munlock(long address, long byteCount) throws ErrnoException;
112    public native void munmap(long address, long byteCount) throws ErrnoException;
113    public native FileDescriptor open(String path, int flags, int mode) throws ErrnoException;
114    public native FileDescriptor[] pipe2(int flags) throws ErrnoException;
115    public native int poll(StructPollfd[] fds, int timeoutMs) throws ErrnoException;
116    public native void posix_fallocate(FileDescriptor fd, long offset, long length) throws ErrnoException;
117    public native int prctl(int option, long arg2, long arg3, long arg4, long arg5) throws ErrnoException;
118    public int pread(FileDescriptor fd, ByteBuffer buffer, long offset) throws ErrnoException, InterruptedIOException {
119        final int bytesRead;
120        final int position = buffer.position();
121
122        if (buffer.isDirect()) {
123            bytesRead = preadBytes(fd, buffer, position, buffer.remaining(), offset);
124        } else {
125            bytesRead = preadBytes(fd, NioUtils.unsafeArray(buffer), NioUtils.unsafeArrayOffset(buffer) + position, buffer.remaining(), offset);
126        }
127
128        maybeUpdateBufferPosition(buffer, position, bytesRead);
129        return bytesRead;
130    }
131    public int pread(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, long offset) throws ErrnoException, InterruptedIOException {
132        // This indirection isn't strictly necessary, but ensures that our public interface is type safe.
133        return preadBytes(fd, bytes, byteOffset, byteCount, offset);
134    }
135    private native int preadBytes(FileDescriptor fd, Object buffer, int bufferOffset, int byteCount, long offset) throws ErrnoException, InterruptedIOException;
136    public int pwrite(FileDescriptor fd, ByteBuffer buffer, long offset) throws ErrnoException, InterruptedIOException {
137        final int bytesWritten;
138        final int position = buffer.position();
139
140        if (buffer.isDirect()) {
141            bytesWritten = pwriteBytes(fd, buffer, position, buffer.remaining(), offset);
142        } else {
143            bytesWritten = pwriteBytes(fd, NioUtils.unsafeArray(buffer), NioUtils.unsafeArrayOffset(buffer) + position, buffer.remaining(), offset);
144        }
145
146        maybeUpdateBufferPosition(buffer, position, bytesWritten);
147        return bytesWritten;
148    }
149    public int pwrite(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, long offset) throws ErrnoException, InterruptedIOException {
150        // This indirection isn't strictly necessary, but ensures that our public interface is type safe.
151        return pwriteBytes(fd, bytes, byteOffset, byteCount, offset);
152    }
153    private native int pwriteBytes(FileDescriptor fd, Object buffer, int bufferOffset, int byteCount, long offset) throws ErrnoException, InterruptedIOException;
154    public int read(FileDescriptor fd, ByteBuffer buffer) throws ErrnoException, InterruptedIOException {
155        final int bytesRead;
156        final int position = buffer.position();
157
158        if (buffer.isDirect()) {
159            bytesRead = readBytes(fd, buffer, position, buffer.remaining());
160        } else {
161            bytesRead = readBytes(fd, NioUtils.unsafeArray(buffer), NioUtils.unsafeArrayOffset(buffer) + position, buffer.remaining());
162        }
163
164        maybeUpdateBufferPosition(buffer, position, bytesRead);
165        return bytesRead;
166    }
167    public int read(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount) throws ErrnoException, InterruptedIOException {
168        // This indirection isn't strictly necessary, but ensures that our public interface is type safe.
169        return readBytes(fd, bytes, byteOffset, byteCount);
170    }
171    private native int readBytes(FileDescriptor fd, Object buffer, int offset, int byteCount) throws ErrnoException, InterruptedIOException;
172    public native String readlink(String path) throws ErrnoException;
173    public native int readv(FileDescriptor fd, Object[] buffers, int[] offsets, int[] byteCounts) throws ErrnoException, InterruptedIOException;
174    public int recvfrom(FileDescriptor fd, ByteBuffer buffer, int flags, InetSocketAddress srcAddress) throws ErrnoException, SocketException {
175        final int bytesReceived;
176        final int position = buffer.position();
177
178        if (buffer.isDirect()) {
179            bytesReceived = recvfromBytes(fd, buffer, position, buffer.remaining(), flags, srcAddress);
180        } else {
181            bytesReceived = recvfromBytes(fd, NioUtils.unsafeArray(buffer), NioUtils.unsafeArrayOffset(buffer) + position, buffer.remaining(), flags, srcAddress);
182        }
183
184        maybeUpdateBufferPosition(buffer, position, bytesReceived);
185        return bytesReceived;
186    }
187    public int recvfrom(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, int flags, InetSocketAddress srcAddress) throws ErrnoException, SocketException {
188        // This indirection isn't strictly necessary, but ensures that our public interface is type safe.
189        return recvfromBytes(fd, bytes, byteOffset, byteCount, flags, srcAddress);
190    }
191    private native int recvfromBytes(FileDescriptor fd, Object buffer, int byteOffset, int byteCount, int flags, InetSocketAddress srcAddress) throws ErrnoException, SocketException;
192    public native void remove(String path) throws ErrnoException;
193    public native void removexattr(String path, String name) throws ErrnoException;
194    public native void rename(String oldPath, String newPath) throws ErrnoException;
195    public native long sendfile(FileDescriptor outFd, FileDescriptor inFd, MutableLong inOffset, long byteCount) throws ErrnoException;
196    public int sendto(FileDescriptor fd, ByteBuffer buffer, int flags, InetAddress inetAddress, int port) throws ErrnoException, SocketException {
197        final int bytesSent;
198        final int position = buffer.position();
199
200        if (buffer.isDirect()) {
201            bytesSent = sendtoBytes(fd, buffer, position, buffer.remaining(), flags, inetAddress, port);
202        } else {
203            bytesSent = sendtoBytes(fd, NioUtils.unsafeArray(buffer), NioUtils.unsafeArrayOffset(buffer) + position, buffer.remaining(), flags, inetAddress, port);
204        }
205
206        maybeUpdateBufferPosition(buffer, position, bytesSent);
207        return bytesSent;
208    }
209    public int sendto(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, int flags, InetAddress inetAddress, int port) throws ErrnoException, SocketException {
210        // This indirection isn't strictly necessary, but ensures that our public interface is type safe.
211        return sendtoBytes(fd, bytes, byteOffset, byteCount, flags, inetAddress, port);
212    }
213    public int sendto(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, int flags, SocketAddress address) throws ErrnoException, SocketException {
214        return sendtoBytes(fd, bytes, byteOffset, byteCount, flags, address);
215    }
216    private native int sendtoBytes(FileDescriptor fd, Object buffer, int byteOffset, int byteCount, int flags, InetAddress inetAddress, int port) throws ErrnoException, SocketException;
217    private native int sendtoBytes(FileDescriptor fd, Object buffer, int byteOffset, int byteCount, int flags, SocketAddress address) throws ErrnoException, SocketException;
218    public native void setegid(int egid) throws ErrnoException;
219    public native void setenv(String name, String value, boolean overwrite) throws ErrnoException;
220    public native void seteuid(int euid) throws ErrnoException;
221    public native void setgid(int gid) throws ErrnoException;
222    public native void setpgid(int pid, int pgid) throws ErrnoException;
223    public native void setregid(int rgid, int egid) throws ErrnoException;
224    public native void setreuid(int ruid, int euid) throws ErrnoException;
225    public native int setsid() throws ErrnoException;
226    public native void setsockoptByte(FileDescriptor fd, int level, int option, int value) throws ErrnoException;
227    public native void setsockoptIfreq(FileDescriptor fd, int level, int option, String value) throws ErrnoException;
228    public native void setsockoptInt(FileDescriptor fd, int level, int option, int value) throws ErrnoException;
229    public native void setsockoptIpMreqn(FileDescriptor fd, int level, int option, int value) throws ErrnoException;
230    public native void setsockoptGroupReq(FileDescriptor fd, int level, int option, StructGroupReq value) throws ErrnoException;
231    public native void setsockoptGroupSourceReq(FileDescriptor fd, int level, int option, StructGroupSourceReq value) throws ErrnoException;
232    public native void setsockoptLinger(FileDescriptor fd, int level, int option, StructLinger value) throws ErrnoException;
233    public native void setsockoptTimeval(FileDescriptor fd, int level, int option, StructTimeval value) throws ErrnoException;
234    public native void setuid(int uid) throws ErrnoException;
235    public native void setxattr(String path, String name, byte[] value, int flags) throws ErrnoException;
236    public native void shutdown(FileDescriptor fd, int how) throws ErrnoException;
237    public native FileDescriptor socket(int domain, int type, int protocol) throws ErrnoException;
238    public native void socketpair(int domain, int type, int protocol, FileDescriptor fd1, FileDescriptor fd2) throws ErrnoException;
239    public native StructStat stat(String path) throws ErrnoException;
240    public native StructStatVfs statvfs(String path) throws ErrnoException;
241    public native String strerror(int errno);
242    public native String strsignal(int signal);
243    public native void symlink(String oldPath, String newPath) throws ErrnoException;
244    public native long sysconf(int name);
245    public native void tcdrain(FileDescriptor fd) throws ErrnoException;
246    public native void tcsendbreak(FileDescriptor fd, int duration) throws ErrnoException;
247    public int umask(int mask) {
248        if ((mask & 0777) != mask) {
249            throw new IllegalArgumentException("Invalid umask: " + mask);
250        }
251        return umaskImpl(mask);
252    }
253    private native int umaskImpl(int mask);
254    public native StructUtsname uname();
255    public native void unsetenv(String name) throws ErrnoException;
256    public native int waitpid(int pid, MutableInt status, int options) throws ErrnoException;
257    public int write(FileDescriptor fd, ByteBuffer buffer) throws ErrnoException, InterruptedIOException {
258        final int bytesWritten;
259        final int position = buffer.position();
260        if (buffer.isDirect()) {
261            bytesWritten = writeBytes(fd, buffer, position, buffer.remaining());
262        } else {
263            bytesWritten = writeBytes(fd, NioUtils.unsafeArray(buffer), NioUtils.unsafeArrayOffset(buffer) + position, buffer.remaining());
264        }
265
266        maybeUpdateBufferPosition(buffer, position, bytesWritten);
267        return bytesWritten;
268    }
269    public int write(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount) throws ErrnoException, InterruptedIOException {
270        // This indirection isn't strictly necessary, but ensures that our public interface is type safe.
271        return writeBytes(fd, bytes, byteOffset, byteCount);
272    }
273    private native int writeBytes(FileDescriptor fd, Object buffer, int offset, int byteCount) throws ErrnoException, InterruptedIOException;
274    public native int writev(FileDescriptor fd, Object[] buffers, int[] offsets, int[] byteCounts) throws ErrnoException, InterruptedIOException;
275
276    private static void maybeUpdateBufferPosition(ByteBuffer buffer, int originalPosition, int bytesReadOrWritten) {
277        if (bytesReadOrWritten > 0) {
278            buffer.position(bytesReadOrWritten + originalPosition);
279        }
280    }
281}
282