int mode()
Returns the open mode for the file.
FILE_READ
FILE_WRITE
FILE_APPEND
FILE_CREATE
FILE_TRUNC
FILE_EXCLUSIVE
FILE_NONBLOCKING
FILE_SET_CLOSE_ON_EXEC
FILE_HAS_INTERNAL_REF
FILE_NO_CLOSE_ON_DESTRUCT
FILE_LOCK_FD
FILE_NOT_OPENED
open()