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@setfilename libm.info

@syncodeindex fn cp

@ifinfo

@format

START-INFO-DIR-ENTRY

* libm::                        An ANSI-C conforming mathematical library.

END-INFO-DIR-ENTRY

@end format

@end ifinfo

@ifinfo

This file documents an ANSI-C conforming mathematical subroutine library.

Copyright (C) 1992, 1993, 1995, 1996-2008 Red Hat, Inc.

@file{libm} includes software developed at SunPro, a Sun Microsystems,

Inc. business.  Permission to use, copy, modify, and distribute this

software is freely granted, provided that this notice is preserved.

Permission is granted to make and distribute verbatim copies of

this manual provided the copyright notice and this permission notice

are preserved on all copies.

@ignore

Permission is granted to process this file through Tex and print the

results, provided the printed document carries copying permission

notice identical to this one except for the removal of this paragraph

(this paragraph not being relevant to the printed manual).

@end ignore

Permission is granted to copy and distribute modified versions of this

manual under the conditions for verbatim copying, subject to the terms

of the GNU General Public License, which includes the provision that the

entire resulting derived work is distributed under the terms of a

permission notice identical to this one.

Permission is granted to copy and distribute translations of this manual

into another language, under the above conditions for modified versions.

@end ifinfo

@iftex

@finalout

@setchapternewpage odd

@settitle The Red Hat newlib C Math Library

@titlepage

@title The Red Hat newlib C Math Library

@sp 1

@subtitle @code{libm} 1.17.0

@subtitle December 2008

@author {Steve Chamberlain}

@author {Roland Pesch}

@author {Red Hat Support}

@author {Jeff Johnston}

@page

@tex

{\parskip=0pt

\hfill Red Hat Support\par

\hfill sac@@cygnus.com\par

\hfill pesch@@cygnus.com\par

\hfill jjohnstn@@redhat.com\par

}

\global\parindent=0pt % Steve likes it this way

@end tex

@vskip 0pt plus 1filll

Copyright @copyright{} 1992, 1993, 1994-2004 Red Hat, Inc.

@file{libm} includes software developed at SunPro, a Sun Microsystems,

Inc. business.  Permission to use, copy, modify, and distribute this

software is freely granted, provided that this notice is preserved.

Permission is granted to make and distribute verbatim copies of

this manual provided the copyright notice and this permission notice

are preserved on all copies.

Permission is granted to copy and distribute modified versions of this

manual under the conditions for verbatim copying, subject to the terms

of the GNU General Public License, which includes the provision that the

entire resulting derived work is distributed under the terms of a

permission notice identical to this one.

Permission is granted to copy and distribute translations of this manual

into another language, under the above conditions for modified versions.

@end titlepage

@end iftex

@ifinfo

@node Top

@top LIBM

@end ifinfo

@menu

* Math::           The mathematical functions (`math.h').

* Reentrancy::     The functions in libm are not reentrant by default.

* Index::

@end menu

@include targetdep.tex

@node Reentrancy

@chapter Reentrancy Properties of @code{libm}

@cindex reentrancy

@cindex @code{matherr} and reentrancy

When a libm function detects an exceptional case, @code{errno} may be

set, the @code{matherr} function may be called, and a error message

may be written to the standard error stream.  This behavior may not

be reentrant.

@c The exact behavior depends on the currently selected error handling

@c mode (IEEE, POSIX, X/Open, or SVID).

With reentrant C libraries like the Red Hat newlib C library, @code{errno} is

a macro which expands to the per-thread error value.  This makes it thread

safe.

When the user provides his own @code{matherr} function it must be

reentrant for the math library as a whole to be reentrant.

In normal debugged programs, there are usually no math subroutine

errors---and therefore no assignments to @code{errno} and no @code{matherr}

calls; in that situation, the math functions behave reentrantly.

@node Index

@unnumbered Index

@printindex cp

@tex

% I think something like @colophon should be in texinfo.  In the

% meantime:

\long\def\colophon{\hbox to0pt{}\vfill

\centerline{The body of this manual is set in}

\centerline{\fontname\tenrm,}

\centerline{with headings in {\bf\fontname\tenbf}}

\centerline{and examples in {\tt\fontname\tentt}.}

\centerline{{\it\fontname\tenit\/} and}

\centerline{{\sl\fontname\tensl\/}}

\centerline{are used for emphasis.}\vfill}

\page\colophon

% Blame: pesch@cygnus.com, 28mar91.

@end tex

@contents

@bye