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-'\" t
-.\" Copyright (c) 1990, 1991 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.
-.\"
-.\" SPDX-License-Identifier: BSD-4-Clause-UC
-.\"
-.\" @(#)fflush.3 5.4 (Berkeley) 6/29/91
-.\"
-.\" Converted for Linux, Mon Nov 29 15:22:01 1993, faith@cs.unc.edu
-.\"
-.\" Modified 2000-07-22 by Nicolás Lichtmaier <nick@debian.org>
-.\" Modified 2001-10-16 by John Levon <moz@compsoc.man.ac.uk>
-.\"
-.TH fflush 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-fflush \- flush a stream
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdio.h>
-.P
-.BI "int fflush(FILE *_Nullable " stream );
-.fi
-.SH DESCRIPTION
-For output streams,
-.BR fflush ()
-forces a write of all user-space buffered data for the given output or update
-.I stream
-via the stream's underlying write function.
-.P
-For input streams associated with seekable files
-(e.g., disk files, but not pipes or terminals),
-.BR fflush ()
-discards any buffered data that has been fetched from the underlying file,
-but has not been consumed by the application.
-.P
-The open status of the stream is unaffected.
-.P
-If the
-.I stream
-argument is NULL,
-.BR fflush ()
-flushes
-.I all
-open output streams.
-.\" mtk: POSIX specifies that only output streams are flushed for this case.
-.\" Also verified for glibc by experiment.
-.P
-For a nonlocking counterpart, see
-.BR unlocked_stdio (3).
-.SH RETURN VALUE
-Upon successful completion 0 is returned.
-Otherwise,
-.B EOF
-is returned and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EBADF
-.I stream
-is not an open stream, or is not open for writing.
-.P
-The function
-.BR fflush ()
-may also fail and set
-.I errno
-for any of the errors specified for
-.BR write (2).
-.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 fflush ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C89, POSIX.1-2001, POSIX.1-2008.
-.P
-POSIX.1-2001 did not specify the behavior for flushing of input streams,
-but the behavior is specified in POSIX.1-2008.
-.SH NOTES
-Note that
-.BR fflush ()
-flushes only the user-space buffers provided by the C library.
-To ensure that the data is physically stored on disk
-the kernel buffers must be flushed too, for example, with
-.BR sync (2)
-or
-.BR fsync (2).
-.SH SEE ALSO
-.BR fsync (2),
-.BR sync (2),
-.BR write (2),
-.BR fclose (3),
-.BR fileno (3),
-.BR fopen (3),
-.BR fpurge (3),
-.BR setbuf (3),
-.BR unlocked_stdio (3)