module LargeFile: sig .. endUnix.lseek (for positioning a file descriptor),
  Unix.truncate and Unix.ftruncate (for changing the size of a file),
  and Unix.stat, Unix.lstat and Unix.fstat (for obtaining
  information on files).  These alternate functions represent
  positions and sizes by 64-bit integers (type int64) instead of
  regular integers (type int), thus allowing operating on files
  whose sizes are greater than max_int.let lseek: (Unix.file_descr, int64, Unix.seek_command) => int64;
let truncate: (string, int64) => unit;
let ftruncate: (Unix.file_descr, int64) => unit;
type stats = {|    | st_dev : int; | (* | 
Device number | *) | 
|    | st_ino : int; | (* | 
Inode number | *) | 
|    | st_kind : Unix.file_kind; | (* | 
Kind of the file | *) | 
|    | st_perm : Unix.file_perm; | (* | 
Access rights | *) | 
|    | st_nlink : int; | (* | 
Number of links | *) | 
|    | st_uid : int; | (* | 
User id of the owner | *) | 
|    | st_gid : int; | (* | 
Group ID of the file's group | *) | 
|    | st_rdev : int; | (* | 
Device minor number | *) | 
|    | st_size : int64; | (* | 
Size in bytes | *) | 
|    | st_atime : float; | (* | 
Last access time | *) | 
|    | st_mtime : float; | (* | 
Last modification time | *) | 
|    | st_ctime : float; | (* | 
Last status change time | *) | 
let stat: string => stats;
let lstat: string => stats;
let fstat: Unix.file_descr => stats;