FileSystem (Jikes RVM API)

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org.jikesrvm.runtime
Class FileSystem

java.lang.Object
  org.jikesrvm.runtime.FileSystem

public class FileSystem
extends Object
extends Object

Interface to filesystem of underlying operating system. Historically this has provided a blocking IO abstraction on top of non-blocking IO, which was necessary for green threads. The current code contains only abstractions for dealing with things like file status.

Field Summary
`static int`	`ACCESS_F_OK`
`static int`	`ACCESS_R_OK`
`static int`	`ACCESS_W_OK`
`static int`	`ACCESS_X_OK`
`static int`	`OPEN_APPEND`
`static int`	`OPEN_MODIFY`
`static int`	`OPEN_READ`
`static int`	`OPEN_WRITE`
`static int`	`SEEK_CUR`
`static int`	`SEEK_END`
`static int`	`SEEK_SET`
`static int`	`STAT_EXISTS`
`static int`	`STAT_IS_DIRECTORY`
`static int`	`STAT_IS_FILE`
`static int`	`STAT_IS_READABLE`
`static int`	`STAT_IS_WRITABLE`
`static int`	`STAT_LAST_MODIFIED`
`static int`	`STAT_LENGTH`

Constructor Summary
`FileSystem()`

Method Summary
`static int`	`access(String fileName, int kind)` Get user's perms for a file.
`static int`	`bytesAvailable(int fd)`
`static void`	`initializeStandardStreams()` Called from VM.boot to set up java.lang.System.in, java.lang.System.out, and java.lang.System.err
`static int`	`readByte(int fd)` Read single byte from file.
`static int`	`readBytes(int fd, byte[] buf, int off, int cnt)` Read multiple bytes.
`static int`	`stat(String fileName, int kind)` Get file status.
`static boolean`	`sync(int fd)`
`static int`	`writeByte(int fd, int b)` Write single byte to file
`static int`	`writeBytes(int fd, byte[] buf, int off, int cnt)` Write multiple bytes.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

OPEN_READ

public static final int OPEN_READ

See Also:: Constant Field Values

OPEN_WRITE

public static final int OPEN_WRITE

See Also:: Constant Field Values

OPEN_MODIFY

public static final int OPEN_MODIFY

See Also:: Constant Field Values

OPEN_APPEND

public static final int OPEN_APPEND

See Also:: Constant Field Values

SEEK_SET

public static final int SEEK_SET

See Also:: Constant Field Values

SEEK_CUR

public static final int SEEK_CUR

See Also:: Constant Field Values

SEEK_END

public static final int SEEK_END

See Also:: Constant Field Values

STAT_EXISTS

public static final int STAT_EXISTS

See Also:: Constant Field Values

STAT_IS_FILE

public static final int STAT_IS_FILE

See Also:: Constant Field Values

STAT_IS_DIRECTORY

public static final int STAT_IS_DIRECTORY

See Also:: Constant Field Values

STAT_IS_READABLE

public static final int STAT_IS_READABLE

See Also:: Constant Field Values

STAT_IS_WRITABLE

public static final int STAT_IS_WRITABLE

See Also:: Constant Field Values

STAT_LAST_MODIFIED

public static final int STAT_LAST_MODIFIED

See Also:: Constant Field Values

STAT_LENGTH

public static final int STAT_LENGTH

See Also:: Constant Field Values

ACCESS_F_OK

public static final int ACCESS_F_OK

See Also:: Constant Field Values

ACCESS_R_OK

public static final int ACCESS_R_OK

See Also:: Constant Field Values

ACCESS_W_OK

public static final int ACCESS_W_OK

See Also:: Constant Field Values

ACCESS_X_OK

public static final int ACCESS_X_OK

See Also:: Constant Field Values

Constructor Detail

FileSystem

public FileSystem()

Method Detail

stat

public static int stat(String fileName,
                       int kind)

Get file status.

Parameters:: fileName - file name; kind - kind of info desired (one of STAT_XXX, above)
Returns:: desired info (-1 -> error) The boolean ones return 0 in case of non-true, 1 in case of true status.

access

public static int access(String fileName,
                         int kind)

Get user's perms for a file.

Parameters:: fileName - file name; kind - kind of access perm(s) to check for (ACCESS_W_OK,...)
Returns:: 0 if access ok (-1 -> error)

readByte

public static int readByte(int fd)

Read single byte from file.

Parameters:: fd - file descriptor
Returns:: byte that was read (< -2: i/o error, -2: timeout, -1: eof, >= 0: data)

writeByte

public static int writeByte(int fd,
                            int b)

Write single byte to file

Parameters:: fd - file descriptor; b - byte to be written
Returns:: -2: i/o error, -1: timeout, 0: ok

readBytes

public static int readBytes(int fd,
                            byte[] buf,
                            int off,
                            int cnt)

Read multiple bytes.

Parameters:: buf - a pinned byte array to read into
Returns:: -2: i/o error, -1: timeout, >=0: number of bytes read

writeBytes

public static int writeBytes(int fd,
                             byte[] buf,
                             int off,
                             int cnt)

Write multiple bytes.

Parameters:: buf - a pinned byte array to write from
Returns:: -2: i/o error, -1: timeout, >=0: number of bytes written

sync

public static boolean sync(int fd)

bytesAvailable

public static int bytesAvailable(int fd)

initializeStandardStreams

public static void initializeStandardStreams()

Called from VM.boot to set up java.lang.System.in, java.lang.System.out, and java.lang.System.err