'\" te
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.TH FTELL 3C "Jul 24, 2002"
.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
.na
\fB\fBEBADF\fR\fR
.ad
.RS 10n
The file descriptor underlying \fIstream\fR is not an open file descriptor.
.RE

.sp
.ne 2
.na
\fB\fBESPIPE\fR\fR
.ad
.RS 10n
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
.na
\fB\fBEOVERFLOW\fR\fR
.ad
.RS 13n
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
.na
\fB\fBEOVERFLOW\fR\fR
.ad
.RS 13n
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
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	MT-Safe
.TE

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