private void StartRaisingEvents()
{
//Cannot allocate the directoryHandle and the readBuffer if the object has been disposed; finalization has been suppressed.
if (this.disposed)
{
throw new ObjectDisposedException(GetType().Name);
}
try {
new EnvironmentPermission(PermissionState.Unrestricted).Assert();
if (Environment.OSVersion.Platform != PlatformID.Win32NT)
{
throw new PlatformNotSupportedException(SR.GetString(SR.WinNTRequired));
}
}
finally {
CodeAccessPermission.RevertAssert();
}
// If we're called when "Initializing" is true, set enabled to true
if (IsSuspended())
{
enabled = true;
return;
}
if (!readGranted)
{
string fullPath;
// Consider asserting path discovery permission here.
fullPath = System.IO.Path.GetFullPath(directory);
FileIOPermission permission = new FileIOPermission(FileIOPermissionAccess.Read, fullPath);
permission.Demand();
readGranted = true;
}
// If we're attached, don't do anything.
if (!IsHandleInvalid)
{
return;
}
// Create handle to directory being monitored
directoryHandle = NativeMethods.CreateFile(directory, // Directory name
UnsafeNativeMethods.FILE_LIST_DIRECTORY, // access (read-write) mode
UnsafeNativeMethods.FILE_SHARE_READ |
UnsafeNativeMethods.FILE_SHARE_DELETE |
UnsafeNativeMethods.FILE_SHARE_WRITE, // share mode
null, // security descriptor
UnsafeNativeMethods.OPEN_EXISTING, // how to create
UnsafeNativeMethods.FILE_FLAG_BACKUP_SEMANTICS |
UnsafeNativeMethods.FILE_FLAG_OVERLAPPED, // file attributes
new SafeFileHandle(IntPtr.Zero, false) // file with attributes to copy
);
if (IsHandleInvalid)
{
throw new FileNotFoundException(SR.GetString(SR.FSW_IOError, directory));
}
stopListening = false;
// Start ignoring all events that were initiated before this.
Interlocked.Increment(ref currentSession);
// Attach handle to thread pool
//SECREVIEW: At this point at least FileIOPermission has already been demanded.
SecurityPermission secPermission = new SecurityPermission(PermissionState.Unrestricted);
secPermission.Assert();
try {
ThreadPool.BindHandle(directoryHandle);
}
finally {
SecurityPermission.RevertAssert();
}
enabled = true;
// Setup IO completion port
Monitor(null);
}
