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.\"	$OpenBSD: fflush.3,v 1.12 2015/11/04 21:30:13 tedu Exp $
.\"
.\" Copyright (c) 1990, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek and the American National Standards Committee X3,
.\" on Information Processing Systems.
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.\" modification, are permitted provided that the following conditions
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.Dd $Mdocdate: November 4 2015 $
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.Dt FPURGE 3bsd
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.Os
.Sh NAME
.Nm fpurge
.Nd flush a stream
.Sh LIBRARY
.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
.Lb libbsd
.Sh SYNOPSIS
.In stdio.h
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(See
.Xr libbsd 7
for include usage.)
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.Ft int
.Fn fpurge "FILE *stream"
.Sh DESCRIPTION
The function
.Fn fpurge
erases any input or output buffered in the given
.Fa stream .
For output streams this discards any unwritten output.
For input streams this discards any input read from the underlying object
but not yet obtained via
.Xr getc 3 ;
this includes any text pushed back via
.Xr ungetc 3 .
.Sh RETURN VALUES
Upon successful completion 0 is returned.
Otherwise,
.Dv EOF
is returned and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er EBADF
.Fa stream
is not an open stream.
.El
.Sh SEE ALSO
.Xr fclose 3 ,
.Xr fopen 3 ,
.Xr setvbuf 3
.Sh HISTORY
The
.Fn fpurge
function first appeared in
.Bx 4.4 Lite .