minix/lib/libc/gen/isinf.3
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

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Groff

.\" $NetBSD: isinf.3,v 1.12 2004/03/04 23:47:56 wiz Exp $
.\"
.\" Copyright (c) 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" without specific prior written permission.
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.\"
.\" @(#)isinf.3 8.2 (Berkeley) 1/29/94
.\"
.Dd March 5, 2004
.Dt ISINF 3
.Os
.Sh NAME
.Nm isinf
.Nd test for infinity
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In math.h
.Ft int
.Fn isinf "real-floating x"
.Sh DESCRIPTION
The
.Fn isinf
macro determines whether its argument
.Fa x
is an infinity (positive or negative).
An argument represented in a format wider than its semantic type is
converted to its semantic type first.
The determination is then based on the type of the argument.
.Ss IEEE 754
It is determined whether the value of
.Fa x
is an infinity.
.Ss VAX
Infinities are not supported.
.Sh RETURN VALUES
The
.Fn isinf
macro returns a non-zero value if the value of
.Fa x
is an infinity.
Otherwise 0 is returned.
.Sh SEE ALSO
.Xr fpclassify 3 ,
.Xr isfinite 3 ,
.Xr isinff 3 ,
.Xr isnan 3 ,
.Xr isnanf 3 ,
.Xr isnormal 3 ,
.Xr math 3 ,
.Xr signbit 3
.Rs
.%T "IEEE Standard for Binary Floating-Point Arithmetic"
.%Q ANSI
.%R Std 754-1985
.Re
.Sh STANDARDS
The
.Fn isinf
macro conforms to
.St -isoC-99 .