.\" Copyright (c) 1990, 1991, 1993 The Regents of the University of California.
.\" Copyright (c) 2015 Mariusz Zaborski <oshogbo@FreeBSD.org>
.\" 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.
.\"
.\" 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. 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.
.\"
.Dd February 13, 2024
.Dt FCLOSE 3
.Os
.Sh NAME
.Nm fclose ,
.Nm fdclose ,
.Nm fcloseall
.Nd close a stream
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdio.h
.Ft int
.Fn fclose "FILE *stream"
.Ft int
.Fn fdclose "FILE *stream" "int *fdp"
.Ft void
.Fn fcloseall void
.Sh DESCRIPTION
The
.Fn fclose
function
dissociates the named
.Fa stream
from its underlying file or set of functions.
If the stream was being used for output, any buffered data is written
first, using
.Xr fflush 3 .
.Pp
The
.Fn fdclose
function is equivalent to
.Fn fclose
except that it does not close the underlying file descriptor.
If
.Fa fdp
is not
.Dv NULL ,
the file descriptor will be written to it.
If the stream does not have an associated file descriptor,
.Fa fdp
will be set to -1.
This type of stream is created with functions such as
.Xr fmemopen 3 ,
.Xr funopen 3 ,
or
.Xr open_memstream 3 .
.Pp
The
.Fn fcloseall
function calls
.Fn fclose
on all open streams.
.Sh RETURN VALUES
.Fn fcloseall
does not return a value.
.Pp
Upon successful completion the
.Fn fclose
and
.Fn fdclose
functions return 0.
Otherwise,
.Dv EOF
is returned and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
.Fn fdclose
fails if:
.Bl -tag -width Er
.It Bq Er EOPNOTSUPP
The stream does not have an associated file descriptor.
.El
.Pp
The
.Fn fclose
and
.Fn fdclose
functions may also fail and set
.Va errno
for any of the errors specified for
.Xr fflush 3 .
.Pp
The
.Fn fclose
function may also fail and set errno for any of the errors specified for
.Xr close 2 .
.Sh NOTES
The
.Fn fclose
and
.Fn fdclose
functions do not handle NULL arguments in the
.Fa stream
variable; this will result in a segmentation violation.
This is intentional.
It makes it easier to make sure programs written under
.Fx
are bug free.
This behaviour is an implementation detail, and programs should not
rely upon it.
.Sh SEE ALSO
.Xr close 2 ,
.Xr fflush 3 ,
.Xr fopen 3 ,
.Xr setbuf 3
.Sh STANDARDS
The
.Fn fclose
function
conforms to
.St -isoC .
.Sh HISTORY
The
.Fn fcloseall
function first appeared in
.Fx 7.0 .
.Pp
The
.Fn fdclose
function first appeared in
.Fx 11.0 .