.\" Copyright 2001 Andries Brouwer <aeb@cwi.nl>.
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.TH FSEEKO 3  2001-11-05 "" "Linux Programmer's Manual"
.SH NAME
fseeko, ftello \- seek to or report file position
.SH SYNOPSIS
.nf
.B #include <stdio.h>
.sp
.BI "int fseeko(FILE *" stream ", off_t " offset ", int " whence );
.sp
.BI "off_t ftello(FILE *" stream );
.BI
.fi
.SH DESCRIPTION
The
.BR fseeko ()
and
.BR ftello ()
functions are identical to
.BR fseek (3)
and
.BR ftell (3)
(see
.BR fseek (3)),
respectively, except that the \fIoffset\fP argument of
.BR fseeko ()
and the return value of
.BR ftello ()
is of type \fIoff_t\fP
instead of \fIlong\fP.
.LP
On many architectures both \fIoff_t\fP and \fIlong\fP are 32-bit types,
but compilation with
.RS
.nf

#define _FILE_OFFSET_BITS 64
.fi
.RE
.PP
will turn \fIoff_t\fP into a 64-bit type.
.SH RETURN VALUE
On successful completion,
.BR fseeko ()
returns 0, while
.BR ftello ()
returns the current offset.
Otherwise, \-1 is returned and
.I errno
is set to indicate the error.
.SH ERRORS
See the ERRORS in
.BR fseek (3).
.SH "CONFORMING TO"
SUSv2, POSIX.1-2001.
.SH 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.
.SH "SEE ALSO"
.BR fseek (3)
.SH COLOPHON
This page is part of release 3.44 of the Linux
.I man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.