moss.kernel
Class MExec

java.lang.Object
  moss.kernel.MExec

public class MExec
extends java.lang.Object

the MExec class provides the necessary to allow the kernel to load some program from the file-system

Field Summary

static int	EXEC_CLASS Java class (that should implement an appropriate executable interface)
static int	EXEC_INVALID invalid executable
static int	EXEC_SCRIPT script-based command

Constructor Summary

MExec()
constructor: creates a new MExec

Method Summary

java.lang.String	classnameof() returns a string providing a class-name for MExecCL objects.
int	errorof() returns the last reported error for this MExec object
java.lang.ClassLoader	getclassloader() returns a class loader for some executable
static MExec	load_active(java.lang.String path) this is called to return an already loaded MExec for a path (ie something that is already running).
int	setpath(java.lang.String path) sets the file for an MExec -- this will look at the file and attempt to determine what type it is.
java.lang.String[]	shebangof() returns the array of strings that represents the hash-bang path, with this executable's name attached
static void	store_active(MExec exec, java.lang.String path) adds an MExec to the list of those loaded
static void	trash_active(MExec exec, java.lang.String path) this removes a loaded MExec, called when a process is done using it (during process shutdown)
int	typeof() return the MExec type of this object

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

EXEC_INVALID

public static final int EXEC_INVALID

invalid executable

See Also:

Constant Field Values

EXEC_CLASS

public static final int EXEC_CLASS

Java class (that should implement an appropriate executable interface)

See Also:

Constant Field Values

EXEC_SCRIPT

public static final int EXEC_SCRIPT

script-based command

See Also:

Constant Field Values

Constructor Detail

MExec

public MExec()

constructor: creates a new MExec

Method Detail

setpath

public int setpath(java.lang.String path)

sets the file for an MExec -- this will look at the file and attempt to determine what type it is.

Parameters:

path - path to executable file

Returns:

0 on success, or < 0 indicating error

getclassloader

public java.lang.ClassLoader getclassloader()

returns a class loader for some executable

Returns:

class-loader on success or null on error

classnameof

public java.lang.String classnameof()

returns a string providing a class-name for MExecCL objects. This is needed since the Java class-loading mechanism (sensibly) won't allow things like lowercase file-names as class names. This just fudges a name -- the actual classloader knows what it really is.

shebangof

public java.lang.String[] shebangof()

returns the array of strings that represents the hash-bang path, with this executable's name attached

errorof

public int errorof()

returns the last reported error for this MExec object

Returns:

error-code

typeof

public int typeof()

return the MExec type of this object

Returns:

EXEC_... type constant

load_active

public static MExec load_active(java.lang.String path)

this is called to return an already loaded MExec for a path (ie something that is already running).

Parameters:

path - path to executable

Returns:

MExec class or null if not found

store_active

public static void store_active(MExec exec,
                                java.lang.String path)

adds an MExec to the list of those loaded

Parameters:

exec - MExec representing the executable

path - path to the executable

trash_active

public static void trash_active(MExec exec,
                                java.lang.String path)

this removes a loaded MExec, called when a process is done using it (during process shutdown)

Parameters:

exec - MExec representing the executable

path - path to the executable