Summary: Methods | Inherited Methods | [Expand All]

Added in API level 21

public final class

Os

extends Object

java.lang.Object
↳	android.system.Os

Class Overview

Access to low-level system functionality. Most of these are system calls. Most users will want to use higher-level APIs where available, but this class provides access to the underlying primitives used to implement the higher-level APIs.

The corresponding constants can be found in OsConstants.

Summary

Public Methods
static FileDescriptor	accept(FileDescriptor fd, InetSocketAddress peerAddress) See accept(2).
static boolean	access(String path, int mode) See access(2).
static void	bind(FileDescriptor fd, InetAddress address, int port) See bind(2).
static void	chmod(String path, int mode) See chmod(2).
static void	chown(String path, int uid, int gid) See chown(2).
static void	close(FileDescriptor fd) See close(2).
static void	connect(FileDescriptor fd, InetAddress address, int port) See connect(2).
static FileDescriptor	dup(FileDescriptor oldFd) See dup(2).
static FileDescriptor	dup2(FileDescriptor oldFd, int newFd) See dup2(2).
static String[]	environ() See environ(3).
static void	execv(String filename, String[] argv) See execv(2).
static void	execve(String filename, String[] argv, String[] envp) See execve(2).
static void	fchmod(FileDescriptor fd, int mode) See fchmod(2).
static void	fchown(FileDescriptor fd, int uid, int gid) See fchown(2).
static void	fdatasync(FileDescriptor fd) See fdatasync(2).
static StructStat	fstat(FileDescriptor fd) See fstat(2).
static StructStatVfs	fstatvfs(FileDescriptor fd) See fstatvfs(2).
static void	fsync(FileDescriptor fd) See fsync(2).
static void	ftruncate(FileDescriptor fd, long length) See ftruncate(2).
static String	gai_strerror(int error) See gai_strerror(3).
static int	getegid() See getegid(2).
static String	getenv(String name) See getenv(3).
static int	geteuid() See geteuid(2).
static int	getgid() See getgid(2).
static SocketAddress	getpeername(FileDescriptor fd) See getpeername(2).
static int	getpid() See getpid(2).
static int	getppid() See getppid(2).
static SocketAddress	getsockname(FileDescriptor fd) See getsockname(2).
static int	gettid() See gettid(2).
static int	getuid() See getuid(2).
static String	if_indextoname(int index) See if_indextoname(3).
static InetAddress	inet_pton(int family, String address) See inet_pton(3).
static boolean	isatty(FileDescriptor fd) See isatty(3).
static void	kill(int pid, int signal) See kill(2).
static void	lchown(String path, int uid, int gid) See lchown(2).
static void	link(String oldPath, String newPath) See link(2).
static void	listen(FileDescriptor fd, int backlog) See listen(2).
static long	lseek(FileDescriptor fd, long offset, int whence) See lseek(2).
static StructStat	lstat(String path) See lstat(2).
static void	mincore(long address, long byteCount, byte[] vector) See mincore(2).
static void	mkdir(String path, int mode) See mkdir(2).
static void	mkfifo(String path, int mode) See mkfifo(3).
static void	mlock(long address, long byteCount) See mlock(2).
static long	mmap(long address, long byteCount, int prot, int flags, FileDescriptor fd, long offset) See mmap(2).
static void	msync(long address, long byteCount, int flags) See msync(2).
static void	munlock(long address, long byteCount) See munlock(2).
static void	munmap(long address, long byteCount) See munmap(2).
static FileDescriptor	open(String path, int flags, int mode) See open(2).
static FileDescriptor[]	pipe() See pipe(2).
static int	poll(StructPollfd[] fds, int timeoutMs) See poll(2).
static void	posix_fallocate(FileDescriptor fd, long offset, long length) See posix_fallocate(2).
static int	prctl(int option, long arg2, long arg3, long arg4, long arg5) See prctl(2).
static int	pread(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, long offset) See pread(2).
static int	pread(FileDescriptor fd, ByteBuffer buffer, long offset) See pread(2).
static int	pwrite(FileDescriptor fd, ByteBuffer buffer, long offset) See pwrite(2).
static int	pwrite(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, long offset) See pwrite(2).
static int	read(FileDescriptor fd, ByteBuffer buffer) See read(2).
static int	read(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount) See read(2).
static String	readlink(String path) See readlink(2).
static int	readv(FileDescriptor fd, Object[] buffers, int[] offsets, int[] byteCounts) See readv(2).
static int	recvfrom(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, int flags, InetSocketAddress srcAddress) See recvfrom(2).
static int	recvfrom(FileDescriptor fd, ByteBuffer buffer, int flags, InetSocketAddress srcAddress) See recvfrom(2).
static void	remove(String path) See remove(3).
static void	rename(String oldPath, String newPath) See rename(2).
static long	sendfile(FileDescriptor outFd, FileDescriptor inFd, MutableLong inOffset, long byteCount) See sendfile(2).
static int	sendto(FileDescriptor fd, ByteBuffer buffer, int flags, InetAddress inetAddress, int port) See sendto(2).
static int	sendto(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, int flags, InetAddress inetAddress, int port) See sendto(2).
static void	setegid(int egid) See setegid(2).
static void	setenv(String name, String value, boolean overwrite) See setenv(3).
static void	seteuid(int euid) See seteuid(2).
static void	setgid(int gid) See setgid(2).
static int	setsid() See setsid(2).
static void	setuid(int uid) See setuid(2).
static void	shutdown(FileDescriptor fd, int how) See shutdown(2).
static FileDescriptor	socket(int domain, int type, int protocol) See socket(2).
static void	socketpair(int domain, int type, int protocol, FileDescriptor fd1, FileDescriptor fd2) See socketpair(2).
static StructStat	stat(String path) See stat(2).
static StructStatVfs	statvfs(String path) See statvfs(2).
static String	strerror(int errno) See strerror(2).
static String	strsignal(int signal) See strsignal(3).
static void	symlink(String oldPath, String newPath) See symlink(2).
static long	sysconf(int name) See sysconf(3).
static void	tcdrain(FileDescriptor fd) See tcdrain(3).
static void	tcsendbreak(FileDescriptor fd, int duration) See tcsendbreak(3).
static int	umask(int mask) See umask(2).
static StructUtsname	uname() See uname(2).
static void	unsetenv(String name) See unsetenv(3).
static int	waitpid(int pid, MutableInt status, int options) See waitpid(2).
static int	write(FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount) See write(2).
static int	write(FileDescriptor fd, ByteBuffer buffer) See write(2).
static int	writev(FileDescriptor fd, Object[] buffers, int[] offsets, int[] byteCounts) See writev(2).

[Expand]

Inherited Methods

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

Public Methods

public static FileDescriptor accept (FileDescriptor fd, InetSocketAddress peerAddress)

Added in API level 21

See accept(2).

Throws

ErrnoException
SocketException

public static boolean access (String path, int mode)

Added in API level 21

See access(2).

Throws

ErrnoException

public static void bind (FileDescriptor fd, InetAddress address, int port)

Added in API level 21

See bind(2).

Throws

ErrnoException
SocketException

public static void chmod (String path, int mode)

Added in API level 21

See chmod(2).

Throws

ErrnoException

public static void chown (String path, int uid, int gid)

Added in API level 21

See chown(2).

Throws

ErrnoException

public static void close (FileDescriptor fd)

Added in API level 21

See close(2).

Throws

ErrnoException

public static void connect (FileDescriptor fd, InetAddress address, int port)

Added in API level 21

See connect(2).

Throws

ErrnoException
SocketException

public static FileDescriptor dup (FileDescriptor oldFd)

Added in API level 21

See dup(2).

Throws

ErrnoException

public static FileDescriptor dup2 (FileDescriptor oldFd, int newFd)

Added in API level 21

See dup2(2).

Throws

ErrnoException

public static String[] environ ()

Added in API level 21

See environ(3).

public static void execv (String filename, String[] argv)

Added in API level 21

See execv(2).

Throws

ErrnoException

public static void execve (String filename, String[] argv, String[] envp)

Added in API level 21

See execve(2).

Throws

ErrnoException

public static void fchmod (FileDescriptor fd, int mode)

Added in API level 21

See fchmod(2).

Throws

ErrnoException

public static void fchown (FileDescriptor fd, int uid, int gid)

Added in API level 21

See fchown(2).

Throws

ErrnoException

public static void fdatasync (FileDescriptor fd)

Added in API level 21

See fdatasync(2).

Throws

ErrnoException

public static StructStat fstat (FileDescriptor fd)

Added in API level 21

See fstat(2).

Throws

ErrnoException

public static StructStatVfs fstatvfs (FileDescriptor fd)

Added in API level 21

See fstatvfs(2).

Throws

ErrnoException

public static void fsync (FileDescriptor fd)

Added in API level 21

See fsync(2).

Throws

ErrnoException

public static void ftruncate (FileDescriptor fd, long length)

Added in API level 21

See ftruncate(2).

Throws

ErrnoException

Throws

ErrnoException

public static int getpid ()

Added in API level 21

See getpid(2).

public static int getppid ()

Added in API level 21

See getppid(2).

public static SocketAddress getsockname (FileDescriptor fd)

Added in API level 21

See getsockname(2).

Throws

ErrnoException

public static int gettid ()

Added in API level 21

See gettid(2).

public static int getuid ()

Added in API level 21

See getuid(2).

public static String if_indextoname (int index)

Added in API level 21

See if_indextoname(3).

public static InetAddress inet_pton (int family, String address)

Added in API level 21

See inet_pton(3).

public static boolean isatty (FileDescriptor fd)

Added in API level 21

See isatty(3).

public static void kill (int pid, int signal)

Added in API level 21

See kill(2).

Throws

ErrnoException

public static void lchown (String path, int uid, int gid)

Added in API level 21

See lchown(2).

Throws

ErrnoException

public static void link (String oldPath, String newPath)

Added in API level 21

See link(2).

Throws

ErrnoException

public static void listen (FileDescriptor fd, int backlog)

Added in API level 21

See listen(2).

Throws

ErrnoException

public static long lseek (FileDescriptor fd, long offset, int whence)

Added in API level 21

See lseek(2).

Throws

ErrnoException

public static StructStat lstat (String path)

Added in API level 21

See lstat(2).

Throws

ErrnoException

public static void mincore (long address, long byteCount, byte[] vector)

Added in API level 21

See mincore(2).

Throws

ErrnoException

public static void mkdir (String path, int mode)

Added in API level 21

See mkdir(2).

Throws

ErrnoException

public static void mkfifo (String path, int mode)

Added in API level 21

See mkfifo(3).

Throws

ErrnoException

public static void mlock (long address, long byteCount)

Added in API level 21

See mlock(2).

Throws

ErrnoException

public static long mmap (long address, long byteCount, int prot, int flags, FileDescriptor fd, long offset)

Added in API level 21

See mmap(2).

Throws

ErrnoException

public static void msync (long address, long byteCount, int flags)

Added in API level 21

See msync(2).

Throws

ErrnoException

public static void munlock (long address, long byteCount)

Added in API level 21

See munlock(2).

Throws

ErrnoException

public static void munmap (long address, long byteCount)

Added in API level 21

See munmap(2).

Throws

ErrnoException

public static FileDescriptor open (String path, int flags, int mode)

Added in API level 21

See open(2).

Throws

ErrnoException

public static FileDescriptor[] pipe ()

Added in API level 21

See pipe(2).

Throws

ErrnoException

public static int poll (StructPollfd[] fds, int timeoutMs)

Added in API level 21

See poll(2).

Throws

ErrnoException

public static void posix_fallocate (FileDescriptor fd, long offset, long length)

Added in API level 21

See posix_fallocate(2).

Throws

ErrnoException

public static int prctl (int option, long arg2, long arg3, long arg4, long arg5)

Added in API level 21

See prctl(2).

Throws

ErrnoException

public static int pread (FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, long offset)

Added in API level 21

See pread(2).

Throws

ErrnoException
InterruptedIOException

public static int pread (FileDescriptor fd, ByteBuffer buffer, long offset)

Added in API level 21

See pread(2).

Throws

ErrnoException
InterruptedIOException

public static int pwrite (FileDescriptor fd, ByteBuffer buffer, long offset)

Added in API level 21

See pwrite(2).

Throws

ErrnoException
InterruptedIOException

public static int pwrite (FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, long offset)

Added in API level 21

See pwrite(2).

Throws

ErrnoException
InterruptedIOException

public static int read (FileDescriptor fd, ByteBuffer buffer)

Added in API level 21

See read(2).

Throws

ErrnoException
InterruptedIOException

public static int read (FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount)

Added in API level 21

See read(2).

Throws

ErrnoException
InterruptedIOException

public static String readlink (String path)

Added in API level 21

See readlink(2).

Throws

ErrnoException

public static int readv (FileDescriptor fd, Object[] buffers, int[] offsets, int[] byteCounts)

Added in API level 21

See readv(2).

Throws

ErrnoException
InterruptedIOException

public static int recvfrom (FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, int flags, InetSocketAddress srcAddress)

Added in API level 21

See recvfrom(2).

Throws

ErrnoException
SocketException

public static int recvfrom (FileDescriptor fd, ByteBuffer buffer, int flags, InetSocketAddress srcAddress)

Added in API level 21

See recvfrom(2).

Throws

ErrnoException
SocketException

public static void remove (String path)

Added in API level 21

See remove(3).

Throws

ErrnoException

public static void rename (String oldPath, String newPath)

Added in API level 21

See rename(2).

Throws

ErrnoException

public static long sendfile (FileDescriptor outFd, FileDescriptor inFd, MutableLong inOffset, long byteCount)

Added in API level 21

See sendfile(2).

Throws

ErrnoException

public static int sendto (FileDescriptor fd, ByteBuffer buffer, int flags, InetAddress inetAddress, int port)

Added in API level 21

See sendto(2).

Throws

ErrnoException
SocketException

public static int sendto (FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount, int flags, InetAddress inetAddress, int port)

Added in API level 21

See sendto(2).

Throws

ErrnoException
SocketException

public static void setegid (int egid)

Added in API level 21

See setegid(2).

Throws

ErrnoException

public static void setenv (String name, String value, boolean overwrite)

Added in API level 21

See setenv(3).

Throws

ErrnoException

public static void seteuid (int euid)

Added in API level 21

See seteuid(2).

Throws

ErrnoException

public static void setgid (int gid)

Added in API level 21

See setgid(2).

Throws

ErrnoException

public static int setsid ()

Added in API level 21

See setsid(2).

Throws

ErrnoException

public static void setuid (int uid)

Added in API level 21

See setuid(2).

Throws

ErrnoException

public static void shutdown (FileDescriptor fd, int how)

Added in API level 21

See shutdown(2).

Throws

ErrnoException

public static FileDescriptor socket (int domain, int type, int protocol)

Added in API level 21

See socket(2).

Throws

ErrnoException

public static void socketpair (int domain, int type, int protocol, FileDescriptor fd1, FileDescriptor fd2)

Added in API level 21

See socketpair(2).

Throws

ErrnoException

public static StructStat stat (String path)

Added in API level 21

See stat(2).

Throws

ErrnoException

public static StructStatVfs statvfs (String path)

Added in API level 21

See statvfs(2).

Throws

ErrnoException

public static String strerror (int errno)

Added in API level 21

See strerror(2).

public static String strsignal (int signal)

Added in API level 21

See strsignal(3).

public static void symlink (String oldPath, String newPath)

Added in API level 21

See symlink(2).

Throws

ErrnoException

public static long sysconf (int name)

Added in API level 21

See sysconf(3).

public static void tcdrain (FileDescriptor fd)

Added in API level 21

See tcdrain(3).

Throws

ErrnoException

public static void tcsendbreak (FileDescriptor fd, int duration)

Added in API level 21

See tcsendbreak(3).

Throws

ErrnoException

public static int umask (int mask)

Added in API level 21

See umask(2).

public static StructUtsname uname ()

Added in API level 21

See uname(2).

public static void unsetenv (String name)

Added in API level 21

See unsetenv(3).

Throws

ErrnoException

public static int waitpid (int pid, MutableInt status, int options)

Added in API level 21

See waitpid(2).

Throws

ErrnoException

public static int write (FileDescriptor fd, byte[] bytes, int byteOffset, int byteCount)

Added in API level 21

See write(2).

Throws

ErrnoException
InterruptedIOException

public static int write (FileDescriptor fd, ByteBuffer buffer)

Added in API level 21

See write(2).

Throws

ErrnoException
InterruptedIOException

public static int writev (FileDescriptor fd, Object[] buffers, int[] offsets, int[] byteCounts)

Added in API level 21

See writev(2).

Throws

ErrnoException
InterruptedIOException

Results

Classes

Exceptions

Os

Class Overview

Summary

Public Methods

public static FileDescriptor accept (FileDescriptor fd, InetSocketAddress peerAddress)

Throws

public static boolean access (String path, int mode)

Throws

public static void bind (FileDescriptor fd, InetAddress address, int port)

Throws

public static void chmod (String path, int mode)

Throws

public static void chown (String path, int uid, int gid)

Throws

public static void close (FileDescriptor fd)

Throws

public static void connect (FileDescriptor fd, InetAddress address, int port)

Throws

public static FileDescriptor dup (FileDescriptor oldFd)

Throws

public static FileDescriptor dup2 (FileDescriptor oldFd, int newFd)

Throws

public static String[] environ ()

public static void execv (String filename, String[] argv)

Throws

public static void execve (String filename, String[] argv, String[] envp)

Throws

public static void fchmod (FileDescriptor fd, int mode)

Throws

public static void fchown (FileDescriptor fd, int uid, int gid)

Throws

public static void fdatasync (FileDescriptor fd)

Throws

public static StructStat fstat (FileDescriptor fd)

Throws

public static StructStatVfs fstatvfs (FileDescriptor fd)

Throws

public static void fsync (FileDescriptor fd)

Throws

public static void ftruncate (FileDescriptor fd, long length)

Throws

public static String gai_strerror (int error)

public static int getegid ()

public static String getenv (String name)

public static int geteuid ()

public static int getgid ()

public static SocketAddress getpeername (FileDescriptor fd)

Throws

public static int getpid ()

public static int getppid ()

public static SocketAddress getsockname (FileDescriptor fd)

Throws

public static int gettid ()

public static int getuid ()

public static String if_indextoname (int index)

public static InetAddress inet_pton (int family, String address)

public static boolean isatty (FileDescriptor fd)

public static void kill (int pid, int signal)

Throws

public static void lchown (String path, int uid, int gid)

Throws

public static void link (String oldPath, String newPath)

Throws

public static void listen (FileDescriptor fd, int backlog)

Throws

public static long lseek (FileDescriptor fd, long offset, int whence)

Throws

public static StructStat lstat (String path)

Throws

public static void mincore (long address, long byteCount, byte[] vector)

Throws

public static void mkdir (String path, int mode)

Throws

public static void mkfifo (String path, int mode)

Throws

public static void mlock (long address, long byteCount)

Throws