Lwt_unix.LargeFileval lseek : file_descr -> int64 -> seek_command -> int64 Lwt.tWrapper for Unix.LargeFile.lseek
val truncate : string -> int64 -> unit Lwt.tWrapper for Unix.LargeFile.truncate
val ftruncate : file_descr -> int64 -> unit Lwt.tWrapper for Unix.LargeFile.ftruncate
type stats = Unix.LargeFile.stats = {| st_dev : int; | 
| st_ino : int; | 
| st_kind : file_kind; | 
| st_perm : file_perm; | 
| st_nlink : int; | 
| st_uid : int; | 
| st_gid : int; | 
| st_rdev : int; | 
| st_size : int64; | 
| st_atime : float; | 
| st_mtime : float; | 
| st_ctime : float; | 
}val fstat : file_descr -> stats Lwt.tWrapper for Unix.LargeFile.fstat
val file_exists : string -> bool Lwt.tfile_exists name tests if a file named name exists.
Note that file_exists behaves similarly to Sys.file_exists:
file_exists name will return false in circumstances that would make stat raise a Unix.Unix_error exception.