Truncate Event

Fires when the OS needs to truncate (set the size of) a file.

Syntax

• C#
• VB.NET

public event OnTruncateHandler OnTruncate;

public delegate void OnTruncateHandler(object sender, FuseTruncateEventArgs e);

public class FuseTruncateEventArgs : EventArgs {
  public string Path { get; }
  public int FileContext { get; }
  public long Size { get; }
  public int Result { get; set; }
}

Public Event OnTruncate As OnTruncateHandler

Public Delegate Sub OnTruncateHandler(sender As Object, e As FuseTruncateEventArgs)

Public Class FuseTruncateEventArgs Inherits EventArgs
  Public ReadOnly Property Path As String
  Public ReadOnly Property FileContext As Integer
  Public ReadOnly Property Size As Long
  Public Property Result As Integer
End Class

Remarks

This event fires when the OS wants to set the size of the file, identified by either Path or FileContext.

Note: on non-Windows systems, FileContext may be 0 even for a file that is opened at the moment when the event fires.

The Size parameter contains the new file size. If the new size is larger than the old size, the added space is expected to be filled with null bytes ('\0').

The ResultCode parameter will always be 0 when the event is fired. If the event cannot be handled in a "successful" manner for some reason (e.g., a resource isn't available, security checks failed, etc.), set it to a negative error code value (e.g. -ENOENT to indicate that the file does not exist) to report an appropriate error. Please refer to the Error Reporting and Handling topic for more information.