'\" te
.\"  Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved  Portions Copyright (c) 1992, X/Open Company Limited  All Rights Reserved
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.\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html.  This notice shall appear on any product containing this material. 
.TH ftell 3C "24 Jul 2002" "SunOS 5.11" "Standard C Library Functions"
.SH NAME
ftell, ftello \- return a file offset in a stream
.SH SYNOPSIS
.LP
.nf
#include <stdio.h>

\fBlong\fR \fBftell\fR(\fBFILE *\fR\fIstream\fR);
.fi

.LP
.nf
\fBoff_t\fR \fBftello\fR(\fBFILE *\fR\fIstream\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBftell()\fR function obtains the current value of the file-position indicator for the stream pointed to by \fIstream\fR. The \fBftello()\fR function is identical to \fBftell()\fR except for the return type.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, the \fBftell()\fR and \fBftello()\fR functions return the current value of the file-position indicator for the stream measured in bytes from the beginning of the file. Otherwise, they return \fB\(mi1\fR and sets \fBerrno\fR to indicate the error.
.SH ERRORS
.sp
.LP
The \fBftell()\fR and \fBftello()\fR functions will fail if:
.sp
.ne 2
.mk
.na
\fB\fBEBADF\fR\fR
.ad
.RS 10n
.rt  
The file descriptor underlying \fIstream\fR is not an open file descriptor.
.RE

.sp
.ne 2
.mk
.na
\fB\fBESPIPE\fR\fR
.ad
.RS 10n
.rt  
The file descriptor underlying \fIstream\fR is associated with a pipe, a FIFO, or a socket.
.RE

.sp
.LP
The \fBftell()\fR function will fail if:
.sp
.ne 2
.mk
.na
\fB\fBEOVERFLOW\fR\fR
.ad
.RS 13n
.rt  
The current file offset cannot be represented correctly in an object of type \fBlong\fR.
.RE

.sp
.LP
The \fBftello()\fR function will fail if:
.sp
.ne 2
.mk
.na
\fB\fBEOVERFLOW\fR\fR
.ad
.RS 13n
.rt  
The current file offset cannot be represented correctly in an object of type \fBoff_t\fR.
.RE

.SH USAGE
.sp
.LP
The \fBftello()\fR function has a transitional interface for 64-bit file offsets.  See \fBlf64\fR(5).
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
Interface StabilityCommitted
_
MT-LevelMT-Safe
_
StandardSee \fBstandards\fR(5).
.TE

.SH SEE ALSO
.sp
.LP
\fBlseek\fR(2), \fBfopen\fR(3C), \fBfseek\fR(3C), \fBattributes\fR(5), , \fBstandards\fR(5), \fBlf64\fR(5)