# FTELL, FTELLI8

Portability Functions: Return the current position of a file.

## Module

USE IFPORT

result = FTELL (lunit)

result = FTELLI8 (lunit)

lunit | (Input) INTEGER(4). External unit number of a file.

## Results

The result type is INTEGER(4) for FTELL; INTEGER(8) for FTELLI8. The result is the offset, in bytes, from the beginning of the file. A negative value indicates an error, which is the negation of the IERRNO error code. The following is an example of an error code:

EINVAL: lunit is not a valid unit number, or is not open.

Parent topic: E to F