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+.\"	$OpenBSD: fpclassify.3,v 1.6 2025/06/07 23:56:57 schwarze Exp $
+.\"
+.\" Copyright (c) 2003 Mike Barcroft <mike@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 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.
+.\"
+.\" $FreeBSD: src/lib/libc/gen/fpclassify.3,v 1.6 2005/01/27 05:46:16 das Exp $
+.\"
+.Dd $Mdocdate: June 7 2025 $
+.Dt FPCLASSIFY 3
+.Os
+.Sh NAME
+.Nm fpclassify ,
+.Nm isfinite ,
+.Nm isinf ,
+.Nm isnan ,
+.Nm isnormal ,
+.Nm signbit ,
+.Nm finite ,
+.Nm finitef ,
+.Nm isinff ,
+.Nm isnanf
+.Nd classify a floating-point number
+.Sh SYNOPSIS
+.Lb libm
+.In math.h
+.Ft int
+.Fn fpclassify "real-floating x"
+.Ft int
+.Fn isfinite "real-floating x"
+.Ft int
+.Fn isinf "real-floating x"
+.Ft int
+.Fn isnan "real-floating x"
+.Ft int
+.Fn isnormal "real-floating x"
+.Ft int
+.Fn signbit "real-floating x"
+.Sh DESCRIPTION
+The
+.Fn fpclassify
+macro takes an argument of
+.Fa x
+and returns one of the following manifest constants:
+.Pp
+.Bl -tag -width "FP_SUBNORMALXXX" -offset indent -compact
+.It Dv FP_INFINITE
+Indicates that
+.Fa x
+is an infinite number.
+.It Dv FP_NAN
+Indicates that
+.Fa x
+is not a number (NaN).
+.It Dv FP_NORMAL
+Indicates that
+.Fa x
+is a normalized number.
+.It Dv FP_SUBNORMAL
+Indicates that
+.Fa x
+is a denormalized number.
+.It Dv FP_ZERO
+Indicates that
+.Fa x
+is zero (0 or \-0).
+.El
+.Pp
+The
+.Fn isfinite
+macro returns a non-zero value if and only if its argument has
+a finite (zero, subnormal, or normal) value.
+.Pp
+The
+.Fn isinf ,
+.Fn isnan ,
+and
+.Fn isnormal
+macros return non-zero if and only if
+.Fa x
+is an infinity, NaN,
+or a non-zero normalized number, respectively.
+.Pp
+The
+.Fn signbit
+macro takes an argument of
+.Fa x
+and returns non-zero if the value of its sign is negative, otherwise 0.
+.Sh SEE ALSO
+.Xr isgreater 3
+.Sh STANDARDS
+The
+.Fn fpclassify ,
+.Fn isfinite ,
+.Fn isinf ,
+.Fn isnan ,
+.Fn isnormal ,
+and
+.Fn signbit
+macros conform to
+.St -isoC-99 .
+.Pp
+The symbols
+.Fn isinff ,
+and
+.Fn isnanf
+are provided as compatibility aliases to
+.Fn isinf ,
+and
+.Fn isnan ,
+respectively, and their uses are deprecated.
+Similarly,
+.Fn finite
+and
+.Fn finitef
+are deprecated versions of
+.Fn isfinite .
+.Sh HISTORY
+The
+.Fn fpclassify ,
+.Fn isfinite ,
+.Fn isinf ,
+.Fn isnan ,
+.Fn isnormal ,
+and
+.Fn signbit
+macros were added in
+.Ox 4.4 .
+.Bx 3
+introduced
+.Fn isinf
+and
+.Fn isnan
+functions, which accepted
+.Vt double
+arguments; these have been superseded by the macros
+described above.