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.TH FCLOSEALL 3  2021-03-22 "GNU" "Linux Programmer's Manual"
.SH NAME
fcloseall \- close all open streams
.SH SYNOPSIS
.nf
.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
.B #include <stdio.h>
.PP
.B int fcloseall(void);
.fi
.SH DESCRIPTION
The
.BR fcloseall ()
function closes all of the calling process's open streams.
Buffered output for each stream is written before it is closed
(as for
.BR fflush (3));
buffered input is discarded.
.PP
The standard streams,
.IR stdin ,
.IR stdout ,
and
.I stderr
are also closed.
.SH RETURN VALUE
This function returns 0 if all files were successfully closed;
on error,
.B EOF
is returned.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.ad l
.nh
.TS
allbox;
lbx lb lb
l l l.
Interface	Attribute	Value
T{
.BR fcloseall ()
T}	Thread safety	MT-Unsafe race:streams
.TE
.hy
.ad
.sp 1
.PP
The
.BR fcloseall ()
function does not lock the streams, so it is not thread-safe.
.SH CONFORMING TO
This function is a GNU extension.
.SH SEE ALSO
.BR close (2),
.BR fclose (3),
.BR fflush (3),
.BR fopen (3),
.BR setbuf (3)