/// <devdoc>
/// Callback from thread pool.
/// </devdoc>
/// <internalonly/>
private unsafe void CompletionStatusChanged(uint errorCode, uint numBytes, NativeOverlapped *overlappedPointer)
{
Overlapped overlapped = Overlapped.Unpack(overlappedPointer);
FSWAsyncResult asyncResult = (FSWAsyncResult)overlapped.AsyncResult;
try {
if (stopListening)
{
return;
}
lock (this) {
if (errorCode != 0)
{
if (errorCode == 995 /* ERROR_OPERATION_ABORTED */)
{
//Win2000 inside a service the first completion status is false
//cannot return without monitoring again.
//Because this return statement is inside a try/finally block,
//the finally block will execute. It does restart the monitoring.
return;
}
else
{
OnError(new ErrorEventArgs(new Win32Exception((int)errorCode)));
EnableRaisingEvents = false;
return;
}
}
// Ignore any events that occurred before this "session",
// so we don't get changed or error events after we
// told FSW to stop.
if (asyncResult.session != currentSession)
{
return;
}
if (numBytes == 0)
{
NotifyInternalBufferOverflowEvent();
}
else // Else, parse each of them and notify appropriate delegates
/******
* Format for the buffer is the following C struct:
*
* typedef struct _FILE_NOTIFY_INFORMATION {
* DWORD NextEntryOffset;
* DWORD Action;
* DWORD FileNameLength;
* WCHAR FileName[1];
* } FILE_NOTIFY_INFORMATION;
*
* NOTE1: FileNameLength is length in bytes.
* NOTE2: The Filename is a Unicode string that's NOT NULL terminated.
* NOTE3: A NextEntryOffset of zero means that it's the last entry
*******/
// Parse the file notify buffer:
{
int offset = 0;
int nextOffset, action, nameLength;
string oldName = null;
string name = null;
do
{
fixed(byte *buffPtr = asyncResult.buffer)
{
// Get next offset:
nextOffset = *((int *)(buffPtr + offset));
// Get change flag:
action = *((int *)(buffPtr + offset + 4));
// Get filename length (in bytes):
nameLength = *((int *)(buffPtr + offset + 8));
name = new String((char *)(buffPtr + offset + 12), 0, nameLength / 2);
}
/* A slightly convoluted piece of code follows. Here's what's happening:
*
* We wish to collapse the poorly done rename notifications from the
* ReadDirectoryChangesW API into a nice rename event. So to do that,
* it's assumed that a FILE_ACTION_RENAMED_OLD_NAME will be followed
* immediately by a FILE_ACTION_RENAMED_NEW_NAME in the buffer, which is
* all that the following code is doing.
*
* On a FILE_ACTION_RENAMED_OLD_NAME, it asserts that no previous one existed
* and saves its name. If there are no more events in the buffer, it'll
* assert and fire a RenameEventArgs with the Name field null.
*
* If a NEW_NAME action comes in with no previous OLD_NAME, we assert and fire
* a rename event with the OldName field null.
*
* If the OLD_NAME and NEW_NAME actions are indeed there one after the other,
* we'll fire the RenamedEventArgs normally and clear oldName.
*
* If the OLD_NAME is followed by another action, we assert and then fire the
* rename event with the Name field null and then fire the next action.
*
* In case it's not a OLD_NAME or NEW_NAME action, we just fire the event normally.
*
* (Phew!)
*/
// If the action is RENAMED_FROM, save the name of the file
if (action == Direct.FILE_ACTION_RENAMED_OLD_NAME)
{
Debug.Assert(oldName == null, "FileSystemWatcher: Two FILE_ACTION_RENAMED_OLD_NAME " +
"in a row! [" + oldName + "], [ " + name + "]");
oldName = name;
}
else if (action == Direct.FILE_ACTION_RENAMED_NEW_NAME)
{
if (oldName != null)
{
NotifyRenameEventArgs(WatcherChangeTypes.Renamed, name, oldName);
oldName = null;
}
else
{
Debug.Assert(false, "FileSystemWatcher: FILE_ACTION_RENAMED_NEW_NAME with no" +
"old name! [ " + name + "]");
NotifyRenameEventArgs(WatcherChangeTypes.Renamed, name, oldName);
oldName = null;
}
}
else
{
if (oldName != null)
{
NotifyRenameEventArgs(WatcherChangeTypes.Renamed, null, oldName);
oldName = null;
}
// Notify each file of change
NotifyFileSystemEventArgs(action, name);
}
offset += nextOffset;
} while (nextOffset != 0);
if (oldName != null)
{
Debug.Assert(false, "FileSystemWatcher: FILE_ACTION_RENAMED_OLD_NAME with no" +
"new name! [" + oldName + "]");
NotifyRenameEventArgs(WatcherChangeTypes.Renamed, null, oldName);
oldName = null;
}
}
}
}
finally {
Overlapped.Free(overlappedPointer);
if (!stopListening && !runOnce)
{
Monitor(asyncResult.buffer);
}
}
}
private unsafe void Monitor(byte[] buffer)
{
if (!enabled || IsHandleInvalid)
{
return;
}
Overlapped overlapped = new Overlapped();
if (buffer == null)
{
try {
buffer = new byte[internalBufferSize];
}
catch (OutOfMemoryException) {
throw new OutOfMemoryException(SR.GetString(SR.BufferSizeTooLarge, internalBufferSize.ToString(CultureInfo.CurrentCulture)));
}
}
// Pass "session" counter to callback:
FSWAsyncResult asyncResult = new FSWAsyncResult();
asyncResult.session = currentSession;
asyncResult.buffer = buffer;
// Pack overlapped. The buffer will be pinned by Overlapped:
overlapped.AsyncResult = asyncResult;
NativeOverlapped *overlappedPointer = overlapped.Pack(new IOCompletionCallback(this.CompletionStatusChanged), buffer);
// Can now call OS:
int size;
bool ok = false;
try {
// There could be a ---- in user code between calling StopRaisingEvents (where we close the handle)
// and when we get here from CompletionStatusChanged.
// We might need to take a lock to prevent ---- absolutely, instead just catch
// ObjectDisposedException from SafeHandle in case it is disposed
if (!IsHandleInvalid)
{
// An interrupt is possible here
fixed(byte *buffPtr = buffer)
{
ok = UnsafeNativeMethods.ReadDirectoryChangesW(directoryHandle,
new HandleRef(this, (IntPtr)buffPtr),
internalBufferSize,
includeSubdirectories ? 1 : 0,
(int)notifyFilters,
out size,
overlappedPointer,
NativeMethods.NullHandleRef);
}
}
} catch (ObjectDisposedException) { //Ignore
Debug.Assert(IsHandleInvalid, "ObjectDisposedException from something other than SafeHandle?");
} catch (ArgumentNullException) { //Ignore
Debug.Assert(IsHandleInvalid, "ArgumentNullException from something other than SafeHandle?");
} finally {
if (!ok)
{
Overlapped.Free(overlappedPointer);
// If the handle was for some reason changed or closed during this call, then don't throw an
// exception. Else, it's a valid error.
if (!IsHandleInvalid)
{
OnError(new ErrorEventArgs(new Win32Exception()));
}
}
}
}
private unsafe void Monitor(byte[] buffer) {
if (!enabled || IsHandleInvalid) {
return;
}
Overlapped overlapped = new Overlapped();
if (buffer == null) {
try {
buffer = new byte[internalBufferSize];
}
catch (OutOfMemoryException) {
throw new OutOfMemoryException(SR.GetString(SR.BufferSizeTooLarge, internalBufferSize.ToString(CultureInfo.CurrentCulture)));
}
}
// Pass "session" counter to callback:
FSWAsyncResult asyncResult = new FSWAsyncResult();
asyncResult.session = currentSession;
asyncResult.buffer = buffer;
// Pack overlapped. The buffer will be pinned by Overlapped:
overlapped.AsyncResult = asyncResult;
NativeOverlapped* overlappedPointer = overlapped.Pack(new IOCompletionCallback(this.CompletionStatusChanged), buffer);
// Can now call OS:
int size;
bool ok = false;
try {
// There could be a ---- in user code between calling StopRaisingEvents (where we close the handle)
// and when we get here from CompletionStatusChanged.
// We might need to take a lock to prevent ---- absolutely, instead just catch
// ObjectDisposedException from SafeHandle in case it is disposed
if (!IsHandleInvalid) {
// An interrupt is possible here
fixed (byte * buffPtr = buffer) {
ok = UnsafeNativeMethods.ReadDirectoryChangesW(directoryHandle,
new HandleRef(this, (IntPtr) buffPtr),
internalBufferSize,
includeSubdirectories ? 1 : 0,
(int) notifyFilters,
out size,
overlappedPointer,
NativeMethods.NullHandleRef);
}
}
} catch (ObjectDisposedException ) { //Ignore
Debug.Assert(IsHandleInvalid, "ObjectDisposedException from something other than SafeHandle?");
} catch (ArgumentNullException ) { //Ignore
Debug.Assert(IsHandleInvalid, "ArgumentNullException from something other than SafeHandle?");
} finally {
if (! ok) {
Overlapped.Free(overlappedPointer);
// If the handle was for some reason changed or closed during this call, then don't throw an
// exception. Else, it's a valid error.
if (!IsHandleInvalid) {
OnError(new ErrorEventArgs(new Win32Exception()));
}
}
}
}
/// <devdoc>
/// Calls native API and sets up handle with the directory change API.
/// </devdoc>
/// <internalonly/>
private unsafe void Monitor(byte[] buffer)
{
if (!_enabled || IsHandleInvalid)
{
return;
}
if (buffer == null)
{
buffer = AllocateBuffer();
}
// Pass "session" counter to callback:
FSWAsyncResult asyncResult = new FSWAsyncResult();
asyncResult.session = _currentSession;
asyncResult.buffer = buffer;
NativeOverlapped* overlappedPointer = _threadPoolBinding.AllocateNativeOverlapped(new IOCompletionCallback(this.CompletionStatusChanged), asyncResult, buffer);
// Can now call OS:
int size;
bool ok = false;
try
{
// There could be a race in user code between calling StopRaisingEvents (where we close the handle)
// and when we get here from CompletionStatusChanged.
// We might need to take a lock to prevent race absolutely, instead just catch
// ObjectDisposedException from SafeHandle in case it is disposed
if (!IsHandleInvalid)
{
// An interrupt is possible here
fixed (byte* buffPtr = buffer)
{
ok = UnsafeNativeMethods.ReadDirectoryChangesW(_directoryHandle,
buffPtr,
_internalBufferSize,
_includeSubdirectories ? 1 : 0,
(int)_notifyFilters,
out size,
overlappedPointer,
IntPtr.Zero);
}
}
}
catch (ObjectDisposedException)
{ //Ignore
}
catch (ArgumentNullException)
{ //Ignore
Debug.Assert(IsHandleInvalid, "ArgumentNullException from something other than SafeHandle?");
}
finally
{
if (!ok)
{
_threadPoolBinding.FreeNativeOverlapped(overlappedPointer);
// If the handle was for some reason changed or closed during this call, then don't throw an
// exception. Else, it's a valid error.
if (!IsHandleInvalid)
{
OnError(new ErrorEventArgs(new Win32Exception()));
}
}
}
}
/// <devdoc>
/// Calls native API and sets up handle with the directory change API.
/// </devdoc>
/// <internalonly/>
private unsafe void Monitor(byte[] buffer)
{
if (!_enabled || IsHandleInvalid)
{
return;
}
if (buffer == null)
{
buffer = AllocateBuffer();
}
// Pass "session" counter to callback:
FSWAsyncResult asyncResult = new FSWAsyncResult();
asyncResult.session = _currentSession;
asyncResult.buffer = buffer;
NativeOverlapped *overlappedPointer = _threadPoolBinding.AllocateNativeOverlapped(new IOCompletionCallback(this.CompletionStatusChanged), asyncResult, buffer);
// Can now call OS:
int size;
bool ok = false;
try
{
// There could be a race in user code between calling StopRaisingEvents (where we close the handle)
// and when we get here from CompletionStatusChanged.
// We might need to take a lock to prevent race absolutely, instead just catch
// ObjectDisposedException from SafeHandle in case it is disposed
if (!IsHandleInvalid)
{
// An interrupt is possible here
fixed(byte *buffPtr = buffer)
{
ok = UnsafeNativeMethods.ReadDirectoryChangesW(_directoryHandle,
buffPtr,
_internalBufferSize,
_includeSubdirectories ? 1 : 0,
(int)_notifyFilters,
out size,
overlappedPointer,
IntPtr.Zero);
}
}
}
catch (ObjectDisposedException)
{ //Ignore
}
catch (ArgumentNullException)
{ //Ignore
Debug.Assert(IsHandleInvalid, "ArgumentNullException from something other than SafeHandle?");
}
finally
{
if (!ok)
{
_threadPoolBinding.FreeNativeOverlapped(overlappedPointer);
// If the handle was for some reason changed or closed during this call, then don't throw an
// exception. Else, it's a valid error.
if (!IsHandleInvalid)
{
OnError(new ErrorEventArgs(new Win32Exception()));
}
}
}
}
private unsafe void Monitor(byte[] buffer)
{
if (this.enabled && !this.IsHandleInvalid)
{
Overlapped overlapped = new Overlapped();
if (buffer == null)
{
try
{
buffer = new byte[this.internalBufferSize];
}
catch (OutOfMemoryException)
{
throw new OutOfMemoryException(SR.GetString("BufferSizeTooLarge", new object[] { this.internalBufferSize.ToString(CultureInfo.CurrentCulture) }));
}
}
FSWAsyncResult result = new FSWAsyncResult {
session = this.currentSession,
buffer = buffer
};
overlapped.AsyncResult = result;
NativeOverlapped *overlappedPointer = overlapped.Pack(new IOCompletionCallback(this.CompletionStatusChanged), buffer);
bool flag = false;
try
{
if (!this.IsHandleInvalid)
{
try
{
byte[] buffer2;
if (((buffer2 = buffer) == null) || (buffer2.Length == 0))
{
numRef = null;
goto Label_00B3;
}
fixed(byte *numRef = buffer2)
{
int num;
Label_00B3:
flag = Microsoft.Win32.UnsafeNativeMethods.ReadDirectoryChangesW(this.directoryHandle, new HandleRef(this, (IntPtr)numRef), this.internalBufferSize, this.includeSubdirectories ? 1 : 0, (int)this.notifyFilters, out num, overlappedPointer, Microsoft.Win32.NativeMethods.NullHandleRef);
}
}
finally
{
numRef = null;
}
}
}
catch (ObjectDisposedException)
{
}
catch (ArgumentNullException)
{
}
finally
{
if (!flag)
{
Overlapped.Free(overlappedPointer);
if (!this.IsHandleInvalid)
{
this.OnError(new ErrorEventArgs(new Win32Exception()));
}
}
}
}
}
private unsafe void CompletionStatusChanged(uint errorCode, uint numBytes, NativeOverlapped *overlappedPointer)
{
FSWAsyncResult asyncResult = (FSWAsyncResult)Overlapped.Unpack(overlappedPointer).AsyncResult;
try
{
if (!this.stopListening)
{
lock (this)
{
if (errorCode != 0)
{
if (errorCode != 0x3e3)
{
this.OnError(new ErrorEventArgs(new Win32Exception((int)errorCode)));
this.EnableRaisingEvents = false;
}
}
else if (asyncResult.session == this.currentSession)
{
if (numBytes == 0)
{
this.NotifyInternalBufferOverflowEvent();
}
else
{
int num2;
int index = 0;
string oldName = null;
string name = null;
do
{
int num3;
try
{
fixed(byte *numRef = asyncResult.buffer)
{
num2 = numRef[index];
num3 = (numRef + index)[4];
int num4 = (numRef + index)[8];
name = new string((char *)((numRef + index) + 12), 0, num4 / 2);
}
}
finally
{
numRef = null;
}
switch (num3)
{
case 4:
oldName = name;
break;
case 5:
if (oldName != null)
{
this.NotifyRenameEventArgs(WatcherChangeTypes.Renamed, name, oldName);
oldName = null;
}
else
{
this.NotifyRenameEventArgs(WatcherChangeTypes.Renamed, name, oldName);
oldName = null;
}
break;
default:
if (oldName != null)
{
this.NotifyRenameEventArgs(WatcherChangeTypes.Renamed, null, oldName);
oldName = null;
}
this.NotifyFileSystemEventArgs(num3, name);
break;
}
index += num2;
}while (num2 != 0);
if (oldName != null)
{
this.NotifyRenameEventArgs(WatcherChangeTypes.Renamed, null, oldName);
oldName = null;
}
}
}
}
}
}
finally
{
Overlapped.Free(overlappedPointer);
if (!this.stopListening && !this.runOnce)
{
this.Monitor(asyncResult.buffer);
}
}
}
