Returns a string for the absolute path to the current terminal device that is open on the file descriptor file_descriptor.
The file descriptor, which is expected to be either a file resource or an int. An int will be assumed to be a file descriptor that can be passed directly to the underlying system call.
In almost all cases, you will want to provide a file resource.
On success, returns a string of the absolute path of the file_descriptor. On failure, returns false