Unix.LargeFile(3)

okay so bestie, welcome to Unix.LargeFile(3) from the OCaml library — it's literally the manual page for file operations on large files, and it's giving “big file? handled” energy. 💖

🌸 NAME 🌸

Unix.LargeFile — file operations on large files. That's the name, periodt. 🎀

🦋 MODULE 🦋

Module Unix.LargeFile — yes bestie, that's the module name, and it's main character energy. 👑

💖 DOCUMENTATION 💖

Module LargeFile
 : sig end

Okay so this sub-module is all about file operations on large files. It's serving 64-bit variants of the functions you already know, so your file-descriptor positioning and file-size changing can handle the big numbers. 💅

• Unix.LargeFile.lseek — for positioning a file descriptor
• Unix.LargeFile.truncate and Unix.LargeFile.ftruncate — for changing the size of a file
• Unix.LargeFile.stat, Unix.LargeFile.lstat, and Unix.LargeFile.fstat — for obtaining information on files

And the way these alternate functions work? They represent positions and sizes by 64-bit integers (type int64) instead of regular integers (type int), thus allowing you to operate on files whose sizes are greater than max_int. No cap, that's the glow-up. ⭐

---

val lseek : Unix.file_descr -> int64 -> Unix.seek_command -> int64

See lseek.

val truncate : string -> int64 -> unit

See truncate.

val ftruncate : Unix.file_descr -> int64 -> unit

See ftruncate.

---

🍓 type stats 🍓

And here's the stats record, bestie — every field is accounted for, comments and all: 🎀

       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 ID (if special file)
        *)
        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
        *)
        }

val stat : string -> stats

val lstat : string -> stats

val fstat : Unix.file_descr -> stats

---

💖 that's the whole large-file moment, bestie! this page was brought to you by OCamldoc, dated 2026-06-22. mwah! 💅✨