frysk.ftrace
Class MappingGuard

java.lang.Object
  frysk.ftrace.MappingGuard

 class MappingGuard
extends Object

Use this pseudo-class to request that an map/unmap observer be attached to given Task.

Nested Class Summary

private static class	MappingGuard.DebugStateMappingGuard
private static class	MappingGuard.MappingGuardB
private static class	MappingGuard.SyscallMappingGuard

Field Summary

(package private) static boolean	enableDebugstateObserver
(package private) static boolean	enableSyscallObserver
private static Log	fine
private static Map	guardsForTask

Constructor Summary

MappingGuard()

Method Summary

static void	requestAddMappingObserver(Task task, MappingObserver observer)
private static void	requestAddMappingObserver(Task task, MappingObserver observer, boolean preferDebugstate)
static void	requestAddSyscallBasedMappingObserver(Task task, MappingObserver observer)
static void	requestDeleteMappingObserver(Task task, MappingObserver observer)
private static MappingGuard.MappingGuardB	setupDebugStateObserver(Task task) Try to setup guard based on _dl_debug_state.

Methods inherited from class java.lang.Object

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

Field Detail

fine

private static final Log fine

enableSyscallObserver

static boolean enableSyscallObserver

enableDebugstateObserver

static boolean enableDebugstateObserver

guardsForTask

private static final Map guardsForTask

Constructor Detail

MappingGuard

MappingGuard()

Method Detail

setupDebugStateObserver

private static MappingGuard.MappingGuardB setupDebugStateObserver(Task task)

Try to setup guard based on _dl_debug_state. Set up _dl_debug_state observer to spot each mapping. The proper way to do this is to look up the DT_DEBUG entry in task's DYNAMIC segment, and look into the structure it points to. But we would have to wait for dynamic linker to fill this info, and meanwhile we would miss all the mapping/unmapping.

Returns:

true on success, false on failure.

requestAddMappingObserver

private static void requestAddMappingObserver(Task task,
                                              MappingObserver observer,
                                              boolean preferDebugstate)

requestAddMappingObserver

public static void requestAddMappingObserver(Task task,
                                             MappingObserver observer)

requestAddSyscallBasedMappingObserver

public static void requestAddSyscallBasedMappingObserver(Task task,
                                                         MappingObserver observer)

requestDeleteMappingObserver

public static void requestDeleteMappingObserver(Task task,
                                                MappingObserver observer)