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+.\" Copyright (c) 2012 Jeremie Le Hen <jlh@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" 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 and documentation 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 June 29, 2023
+.Dt LIBSTDBUF 3
+.Os
+.Sh NAME
+.Nm libstdbuf
+.Nd preloaded library to change standard streams initial buffering
+.Sh DESCRIPTION
+The
+.Nm
+library is meant to be preloaded with the
+.Ev LD_PRELOAD
+environment variable to as to change the initial buffering
+of standard input, standard output and standard error streams.
+.Pp
+Although you may load and configure this library manually,
+an utility,
+.Xr stdbuf 1 ,
+can be used to run a command with the appropriate environment variables.
+.Sh ENVIRONMENT
+Each stream can be configured independently through the following
+environment variables (values are defined below):
+.Bl -tag -width size -offset indent
+.It Ev _STDBUF_I
+Initial buffering definition for the standard input stream
+.It Ev _STDBUF_O
+Initial buffering definition for the standard output stream
+.It Ev _STDBUF_E
+Initial buffering definition for the standard error stream
+.El
+.Pp
+Each variable may take one of the following values:
+.Bl -tag -width size -offset indent
+.It Qq 0
+unbuffered
+.It Qq L
+line buffered
+.It Qq B
+fully buffered with the default buffer size
+.It Ar size
+fully buffered with a buffer of
+.Ar size
+bytes (suffixes 'k', 'M' and 'G' are accepted)
+.El
+.Sh EXAMPLE
+In the following example, the stdout stream of the
+.Xr awk 1
+command
+will be fully buffered by default because it does not refer
+to a terminal.
+.Nm
+is used to force it to be line-buffered so
+.Xr vmstat 8 Ns 's
+output will not stall until the full buffer fills.
+.Bd -literal -offset indent
+# vmstat 1 | LD_PRELOAD=/usr/lib/libstdbuf.so \\
+    STDBUF_1=L awk '$2 > 1 || $3 > 1' | cat -n
+.Ed
+.Pp
+See
+.Xr stdbuf 1
+for a simpler way to do this.
+.Sh SEE ALSO
+.Xr rtld 1 ,
+.Xr stdbuf 1
+.Sh HISTORY
+The
+.Nm
+library first appeared in
+.Fx 8.4 .
+.Sh AUTHORS
+.An -nosplit
+The original idea of the
+.Nm
+command comes from
+.An Padraig Brady
+who implemented it in the GNU coreutils.
+.An Jeremie Le Hen
+implemented it on
+.Fx .