Determines whether the given file handle is valid.
A handle that is invalid will result in no operations being carried out
when used. In particular addRef/releaseRef will have no effect, but
can safely be called and I/O operations will result in
IOStatus.invalidHandle.
A valid handle gets invalid when either the reference count drops to
zero, or after the file was explicitly closed.
Determines whether the given file handle is valid.
A handle that is invalid will result in no operations being carried out when used. In particular addRef/releaseRef will have no effect, but can safely be called and I/O operations will result in IOStatus.invalidHandle.
A valid handle gets invalid when either the reference count drops to zero, or after the file was explicitly closed.