Name

fseeko, ftello — seek to or report file position

Synopsis

#include <stdio.h>
int fseeko( FILE *  stream,
  off_t   offset,
  int   whence);
off_t ftello( FILE *  stream);

DESCRIPTION

The fseeko() and ftello() functions are identical to fseek(3) and ftell(3) (see fseek(3)), respectively, except that the offset argument of fseeko() and the return value of ftello() is of type off_t instead of long.

On many architectures both off_t and long are 32-bit types, but compilation with

#define _FILE_OFFSET_BITS 64

will turn off_t into a 64-bit type.

RETURN VALUE

On successful completion, fseeko() returns 0, while ftello() returns the current offset. Otherwise, −1 is returned and errno is set to indicate the error.

ERRORS

See the ERRORS in fseek(3).

CONFORMING TO

SUSv2, POSIX.1-2001.

NOTES

These functions are found on System V-like systems. They are not present in libc4, libc5, glibc 2.0 but are available since glibc 2.1.

SEE ALSO

fseek(3)

COLOPHON

This page is part of release 2.79 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


  Copyright 2001 Andries Brouwer <aebcwi.nl>.

Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.

Permission is granted to copy and distribute modified versions of this
manual under the conditions for verbatim copying, provided that the
entire resulting derived work is distributed under the terms of a
permission notice identical to this one.

Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date.  The author(s) assume no
responsibility for errors or omissions, or for damages resulting from
the use of the information contained herein.  The author(s) may not
have taken the same level of care in the production of this manual,
which is licensed free of charge, as they might when working
professionally.

Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.