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Name	Size	Permission
encrypt.3	4.57 KB	-rw-r--r--
fclose.3	4.04 KB	-rw-r--r--
fflush.3	4.23 KB	-rw-r--r--
lockf.3	4.64 KB	-rw-r--r--
rand.3	5.99 KB	-rw-r--r--
strtok.3	7.64 KB	-rw-r--r--
toupper.3	2.79 KB	-rw-r--r--

Code Editor : fflush.3

.\" 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.
.\"
.\" %%%LICENSE_START(BSD_4_CLAUSE_UCB)
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\" %%%LICENSE_END
.\"
.\"     @(#)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 Nicol�s Lichtmaier <nick@debian.org>
.\" Modified 2001-10-16 by John Levon <moz@compsoc.man.ac.uk>
.\"
.TH FFLUSH 3  2013-07-15 "GNU" "Linux Programmer's Manual"
.SH NAME
fflush \- flush a stream
.SH SYNOPSIS
.B #include <stdio.h>
.sp
.BI "int fflush(FILE *" stream );
.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.
For input streams,
.BR fflush ()
discards any buffered data that has been fetched from the underlying file,
but has not been consumed by the application.
The open status of the stream is unaffected.
.PP
If the
.I stream
argument is NULL,
.BR fflush ()
flushes
.I all
open output streams.
.PP
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.
.PP
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;
lb lb lb
l l l.
Interface	Attribute	Value
T{
.BR fflush ()
T}	Thread safety	MT-Safe
.TE
.SH CONFORMING TO
C89, C99, POSIX.1-2001, POSIX.1-2008.

The standards do not specify the behavior for input streams.
Most other implementations behave the same as Linux.
.\" Verified on: Solaris 8.
.SH NOTES
Note that
.BR fflush ()
only flushes 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 fopen (3),
.BR setbuf (3),
.BR unlocked_stdio (3)
.SH COLOPHON
This page is part of release 3.53 of the Linux
.I man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
\%http://www.kernel.org/doc/man\-pages/.

${this.title}

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