man-pages/man3/fseeko.3.html
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<H1>FSEEKO</H1>
Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
<A NAME="lbAB">&nbsp;</A>
<H2>NAME</H2>
fseeko, ftello - seek to or report file position
<A NAME="lbAC">&nbsp;</A>
<H2>SYNOPSIS</H2>
<PRE>
<B>#include &lt;<A HREF="file:///usr/include/stdio.h">stdio.h</A>&gt;</B>
<B>int fseeko(FILE *</B><I>stream</I><B>, off_t </B><I>offset</I><B>, int </B><I>whence</I><B>);</B>
<B>off_t ftello(FILE *</B><I>stream</I><B>);</B>
</PRE>
<P>
Feature Test Macro Requirements for glibc (see
<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
<P>
<B>fseeko</B>(),
<B>ftello</B>():
<BR>
<DL COMPACT><DT id="1"><DD>
_FILE_OFFSET_BITS&nbsp;==&nbsp;64 || _POSIX_C_SOURCE&nbsp;&gt;=&nbsp;200112L
<BR>
(defining the obsolete _LARGEFILE_SOURCE macro also works)
</DL>
<A NAME="lbAD">&nbsp;</A>
<H2>DESCRIPTION</H2>
The
<B>fseeko</B>()
and
<B>ftello</B>()
functions are identical to
<B><A HREF="/cgi-bin/man/man2html?3+fseek">fseek</A></B>(3)
and
<B><A HREF="/cgi-bin/man/man2html?3+ftell">ftell</A></B>(3)
(see
<B><A HREF="/cgi-bin/man/man2html?3+fseek">fseek</A></B>(3)),
respectively, except that the
<I>offset</I>
argument of
<B>fseeko</B>()
and the return value of
<B>ftello</B>()
is of type
<I>off_t</I>
instead of
<I>long</I>.
<P>
On some architectures, both
<I>off_t</I>
and
<I>long</I>
are 32-bit types, but defining
<B>_FILE_OFFSET_BITS</B>
with the value 64 (before including
<I>any</I>
header files)
will turn
<I>off_t</I>
into a 64-bit type.
<A NAME="lbAE">&nbsp;</A>
<H2>RETURN VALUE</H2>
On successful completion,
<B>fseeko</B>()
returns 0, while
<B>ftello</B>()
returns the current offset.
Otherwise, -1 is returned and
<I>errno</I>
is set to indicate the error.
<A NAME="lbAF">&nbsp;</A>
<H2>ERRORS</H2>
See the ERRORS in
<B><A HREF="/cgi-bin/man/man2html?3+fseek">fseek</A></B>(3).
<A NAME="lbAG">&nbsp;</A>
<H2>VERSIONS</H2>
These functions are available under glibc since version 2.1.
<A NAME="lbAH">&nbsp;</A>
<H2>ATTRIBUTES</H2>
For an explanation of the terms used in this section, see
<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
<TABLE BORDER>
<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
<TR VALIGN=top><TD>
<B>fseeko</B>(),
<B>ftello</B>()
</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
</TABLE>
<P>
<A NAME="lbAI">&nbsp;</A>
<H2>CONFORMING TO</H2>
POSIX.1-2001, POSIX.1-2008, SUSv2.
<A NAME="lbAJ">&nbsp;</A>
<H2>SEE ALSO</H2>
<B><A HREF="/cgi-bin/man/man2html?3+fseek">fseek</A></B>(3)
<A NAME="lbAK">&nbsp;</A>
<H2>COLOPHON</H2>
This page is part of release 5.05 of the Linux
<I>man-pages</I>
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
<P>
<HR>
<A NAME="index">&nbsp;</A><H2>Index</H2>
<DL>
<DT id="2"><A HREF="#lbAB">NAME</A><DD>
<DT id="3"><A HREF="#lbAC">SYNOPSIS</A><DD>
<DT id="4"><A HREF="#lbAD">DESCRIPTION</A><DD>
<DT id="5"><A HREF="#lbAE">RETURN VALUE</A><DD>
<DT id="6"><A HREF="#lbAF">ERRORS</A><DD>
<DT id="7"><A HREF="#lbAG">VERSIONS</A><DD>
<DT id="8"><A HREF="#lbAH">ATTRIBUTES</A><DD>
<DT id="9"><A HREF="#lbAI">CONFORMING TO</A><DD>
<DT id="10"><A HREF="#lbAJ">SEE ALSO</A><DD>
<DT id="11"><A HREF="#lbAK">COLOPHON</A><DD>
</DL>
<HR>
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Time: 00:05:43 GMT, March 31, 2021
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