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.TH FSETPOS 3C "Jul 24, 2002"
.SH NAME
fsetpos \- reposition a file pointer in a stream
.SH SYNOPSIS
.LP
.nf
#include <stdio.h>

\fBint\fR \fBfsetpos\fR(\fBFILE *\fR\fIstream\fR, \fBconst fpos_t *\fR\fIpos\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBfsetpos()\fR function sets the file position indicator for the stream
pointed to by \fIstream\fR according to the value of the object pointed to by
\fIpos\fR, which must be a value obtained from an earlier call to
\fBfgetpos\fR(3C) on the same stream.
.sp
.LP
A successful call to \fBfsetpos()\fR function clears the end-of-file indicator
for the stream and undoes any effects of \fBungetc\fR(3C) on the same stream.
After an \fBfsetpos()\fR call, the next operation on an update stream may be
either input or output.
.SH RETURN VALUES
.sp
.LP
The \fBfsetpos()\fR function returns \fB0\fR if it succeeds; otherwise it
returns a non-zero value and sets \fBerrno\fR to indicate the error.
.SH ERRORS
.sp
.LP
The \fBfsetpos()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBEBADF\fR\fR
.ad
.RS 10n
The file descriptor underlying \fIstream\fR is not valid.
.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

.SH USAGE
.sp
.LP
The \fBfsetpos()\fR function has a transitional interface for 64-bit file
offsets.  See \fBlf64\fR(7).
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) 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
.BR lseek (2),
.BR fgetpos (3C),
.BR fopen (3C),
.BR fseek (3C),
.BR ftell (3C),
.BR rewind (3C),
.BR ungetc (3C),
.BR attributes (7),
.BR lf64 (7),
.BR standards (7)