private static int?LoadFileLockViolationHResult()
{
if (Constants.WINDOWS)
{
return(WIN_HRESULT_FILE_LOCK_VIOLATION);
}
// Skip provoking the exception unless we know we will use the value
if (IS_FILESTREAM_LOCKING_PLATFORM)
{
return(FileSupport.GetFileIOExceptionHResult(provokeException: (fileName) =>
{
using (var lockStream = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite))
{
lockStream.Lock(0, 1); // Create an exclusive lock
using (var stream = new FileStream(fileName, FileMode.Open, FileAccess.Write, FileShare.ReadWrite))
{
// try to find out if the file is locked by writing a byte. Note that we need to flush the stream to find out.
stream.WriteByte(0);
stream.Flush(); // this *may* throw an IOException if the file is locked, but...
// ... closing the stream is the real test
}
}
}));
}
return(null);
}
private static int?LoadFileShareViolationHResult()
{
if (Constants.WINDOWS)
{
return(WIN_HRESULT_FILE_SHARE_VIOLATION);
}
return(FileSupport.GetFileIOExceptionHResult(provokeException: (fileName) =>
{
using (var lockStream = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read, 1, FileOptions.None))
// Try to get an exclusive lock on the file - this should throw an IOException with the current platform's HResult value for FileShare violation
using (var stream = new FileStream(fileName, FileMode.Open, FileAccess.Write, FileShare.None, 1, FileOptions.None))
{
}
}));
}
