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-'\" t
-.\" Copyright (c) 1980, 1991 Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" This code is derived from software contributed to Berkeley by
-.\" the American National Standards Committee X3, on Information
-.\" Processing Systems.
-.\"
-.\" SPDX-License-Identifier: BSD-4-Clause-UC
-.\"
-.\"     @(#)setbuf.3	6.10 (Berkeley) 6/29/91
-.\"
-.\" Converted for Linux, Mon Nov 29 14:55:24 1993, faith@cs.unc.edu
-.\" Added section to BUGS, Sun Mar 12 22:28:33 MET 1995,
-.\"                   Thomas.Koenig@ciw.uni-karlsruhe.de
-.\" Correction,  Sun, 11 Apr 1999 15:55:18,
-.\"     Martin Vicente <martin@netadmin.dgac.fr>
-.\" Correction,  2000-03-03, Andreas Jaeger <aj@suse.de>
-.\" Added return value for setvbuf, aeb,
-.\"
-.TH setbuf 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-setbuf, setbuffer, setlinebuf, setvbuf \- stream buffering operations
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdio.h>
-.PP
-.BI "int setvbuf(FILE *restrict " stream ", char " buf "[restrict ." size ],
-.BI "            int " mode ", size_t " size );
-.PP
-.BI "void setbuf(FILE *restrict " stream ", char *restrict " buf );
-.BI "void setbuffer(FILE *restrict " stream ", char " buf "[restrict ." size ],
-.BI "            size_t "  size );
-.BI "void setlinebuf(FILE *" stream );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR setbuffer (),
-.BR setlinebuf ():
-.nf
-    Since glibc 2.19:
-        _DEFAULT_SOURCE
-    glibc 2.19 and earlier:
-        _BSD_SOURCE
-.fi
-.SH DESCRIPTION
-The three types of buffering available are unbuffered, block buffered, and
-line buffered.
-When an output stream is unbuffered, information appears on
-the destination file or terminal as soon as written; when it is block
-buffered, many characters are saved up and written as a block; when it is
-line buffered, characters are saved up until a newline is output or input is
-read from any stream attached to a terminal device (typically \fIstdin\fP).
-The function
-.BR fflush (3)
-may be used to force the block out early.
-(See
-.BR fclose (3).)
-.PP
-Normally all files are block buffered.
-If a stream refers to a terminal (as
-.I stdout
-normally does), it is line buffered.
-The standard error stream
-.I stderr
-is always unbuffered by default.
-.PP
-The
-.BR setvbuf ()
-function may be used on any open stream to change its buffer.
-The
-.I mode
-argument must be one of the following three macros:
-.RS
-.TP
-.B _IONBF
-unbuffered
-.TP
-.B _IOLBF
-line buffered
-.TP
-.B _IOFBF
-fully buffered
-.RE
-.PP
-Except for unbuffered files, the
-.I buf
-argument should point to a buffer at least
-.I size
-bytes long; this buffer will be used instead of the current buffer.
-If the argument
-.I buf
-is NULL,
-only the mode is affected; a new buffer will be allocated on the next read
-or write operation.
-The
-.BR setvbuf ()
-function may be used only after opening a stream and before any other
-operations have been performed on it.
-.PP
-The other three calls are, in effect, simply aliases for calls to
-.BR setvbuf ().
-The
-.BR setbuf ()
-function is exactly equivalent to the call
-.PP
-.in +4n
-setvbuf(stream, buf, buf ? _IOFBF : _IONBF, BUFSIZ);
-.in
-.PP
-The
-.BR setbuffer ()
-function is the same, except that the size of the buffer is up to the
-caller, rather than being determined by the default
-.BR BUFSIZ .
-The
-.BR setlinebuf ()
-function is exactly equivalent to the call:
-.PP
-.in +4n
-setvbuf(stream, NULL, _IOLBF, 0);
-.in
-.SH RETURN VALUE
-The function
-.BR setvbuf ()
-returns 0 on success.
-It returns nonzero on failure
-.RI ( mode
-is invalid or the request cannot be honored).
-It may set
-.I errno
-on failure.
-.PP
-The other functions do not return a value.
-.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 setbuf (),
-.BR setbuffer (),
-.BR setlinebuf (),
-.BR setvbuf ()
-T}	Thread safety	MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-.TP
-.BR setbuf ()
-.TQ
-.BR setvbuf ()
-C11, POSIX.1-2008.
-.SH HISTORY
-.TP
-.BR setbuf ()
-.TQ
-.BR setvbuf ()
-C89, POSIX.1-2001.
-.SH CAVEATS
-POSIX notes
-.\" https://www.austingroupbugs.net/view.php?id=397#c799
-.\" 0000397: setbuf and errno
-that the value of
-.I errno
-is unspecified after a call to
-.BR setbuf ()
-and further notes that, since the value of
-.I errno
-is not required to be unchanged after a successful call to
-.BR setbuf (),
-applications should instead use
-.BR setvbuf ()
-in order to detect errors.
-.SH BUGS
-.\" The
-.\" .BR setbuffer ()
-.\" and
-.\" .BR setlinebuf ()
-.\" functions are not portable to versions of BSD before 4.2BSD, and
-.\" are available under Linux since libc 4.5.21.
-.\" On 4.2BSD and 4.3BSD systems,
-.\" .BR setbuf ()
-.\" always uses a suboptimal buffer size and should be avoided.
-.\".PP
-You must make sure that the space that
-.I buf
-points to still exists by the time
-.I stream
-is closed, which also happens at program termination.
-For example, the following is invalid:
-.PP
-.\" [[invalid]] SRC BEGIN (setbuf.c)
-.EX
-#include <stdio.h>
-\&
-int
-main(void)
-{
-    char buf[BUFSIZ];
-\&
-    setbuf(stdout, buf);
-    printf("Hello, world!\en");
-    return 0;
-}
-.EE
-.\" SRC END
-.SH SEE ALSO
-.BR stdbuf (1),
-.BR fclose (3),
-.BR fflush (3),
-.BR fopen (3),
-.BR fread (3),
-.BR malloc (3),
-.BR printf (3),
-.BR puts (3)