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'\" t
.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH fcloseall 3 2025-05-17 "Linux man-pages (unreleased)"
.SH NAME
fcloseall \- close all open streams
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
.B #include <stdio.h>
.P
.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.
.P
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).
.TS
allbox;
lbx lb lb
l l l.
Interface Attribute Value
T{
.na
.nh
.BR fcloseall ()
T} Thread safety MT-Unsafe race:streams
.TE
.P
The
.BR fcloseall ()
function does not lock the streams, so it is not thread-safe.
.SH STANDARDS
GNU.
.SH SEE ALSO
.BR close (2),
.BR fclose (3),
.BR fflush (3),
.BR fopen (3),
.BR setbuf (3)
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