---
name: "UnixLabels.LargeFile"
section: "3o"
platform: "linux"
package: "ocaml"
version: "5.5.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/UnixLabels.LargeFile"
---

# UnixLabels.LargeFile(3o)

File operations on large files.

## NAME

UnixLabels.LargeFile - File operations on large files.

## Module

Module   UnixLabels.LargeFile

## Documentation

Module **LargeFile**\
  :  **sig end**

File operations on large files. This sub-module provides 64-bit variants of the functions **UnixLabels.LargeFile.lseek** (for positioning a file descriptor), **UnixLabels.LargeFile.truncate** and  **UnixLabels.LargeFile.ftruncate** (for changing the size of a file), and  **UnixLabels.LargeFile.stat** ,  **UnixLabels.LargeFile.lstat** and  **UnixLabels.LargeFile.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** .

*val lseek* :  **UnixLabels.file\_descr -\> int64 -\> mode:UnixLabels.seek\_command -\> int64**

See  **lseek** .

*val truncate* :  **string -\> len:int64 -\> unit**

See  **truncate** .

*val ftruncate* :  **UnixLabels.file\_descr -\> len:int64 -\> unit**

See  **ftruncate** .

*type stats* =  **Unix.LargeFile.stats** = {\
  st\_dev :  **int** ;  (\* Device number\
  \*) \
  st\_ino :  **int** ;  (\* Inode number\
  \*) \
  st\_kind :  **UnixLabels.file\_kind** ;  (\* Kind of the file\
  \*) \
  st\_perm :  **UnixLabels.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* :  **UnixLabels.file\_descr -\> stats**