155 lines
4.9 KiB
Plaintext
155 lines
4.9 KiB
Plaintext
\input texinfo.tex
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@setfilename libm.info
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@syncodeindex fn cp
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@ifinfo
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@format
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START-INFO-DIR-ENTRY
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* libm:: An ANSI-C conforming mathematical library.
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END-INFO-DIR-ENTRY
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@end format
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@end ifinfo
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@ifinfo
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This file documents an ANSI-C conforming mathematical subroutine library.
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Copyright (C) 1992, 1993, 1995, 1996-2008 Red Hat, Inc.
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@file{libm} includes software developed at SunPro, a Sun Microsystems,
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Inc. business. Permission to use, copy, modify, and distribute this
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software is freely granted, provided that this notice is preserved.
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Permission is granted to make and distribute verbatim copies of
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this manual provided the copyright notice and this permission notice
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are preserved on all copies.
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@ignore
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Permission is granted to process this file through Tex and print the
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results, provided the printed document carries copying permission
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notice identical to this one except for the removal of this paragraph
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(this paragraph not being relevant to the printed manual).
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@end ignore
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Permission is granted to copy and distribute modified versions of this
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manual under the conditions for verbatim copying, subject to the terms
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of the GNU General Public License, which includes the provision that the
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entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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Permission is granted to copy and distribute translations of this manual
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into another language, under the above conditions for modified versions.
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@end ifinfo
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@iftex
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@finalout
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@setchapternewpage odd
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@settitle The Red Hat newlib C Math Library
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@titlepage
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@title The Red Hat newlib C Math Library
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@sp 1
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@subtitle @code{libm} 1.17.0
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@subtitle December 2008
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@author {Steve Chamberlain}
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@author {Roland Pesch}
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@author {Red Hat Support}
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@author {Jeff Johnston}
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@page
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@tex
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{\parskip=0pt
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\hfill Red Hat Support\par
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\hfill sac@@cygnus.com\par
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\hfill pesch@@cygnus.com\par
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\hfill jjohnstn@@redhat.com\par
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}
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\global\parindent=0pt % Steve likes it this way
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@end tex
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@vskip 0pt plus 1filll
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Copyright @copyright{} 1992, 1993, 1994-2004 Red Hat, Inc.
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@file{libm} includes software developed at SunPro, a Sun Microsystems,
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Inc. business. Permission to use, copy, modify, and distribute this
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software is freely granted, provided that this notice is preserved.
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Permission is granted to make and distribute verbatim copies of
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this manual provided the copyright notice and this permission notice
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are preserved on all copies.
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Permission is granted to copy and distribute modified versions of this
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manual under the conditions for verbatim copying, subject to the terms
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of the GNU General Public License, which includes the provision that the
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entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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Permission is granted to copy and distribute translations of this manual
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into another language, under the above conditions for modified versions.
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@end titlepage
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@end iftex
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@ifinfo
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@node Top
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@top LIBM
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@end ifinfo
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@menu
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* Math:: The mathematical functions (`math.h').
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* Reentrancy:: The functions in libm are not reentrant by default.
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* Long Double Functions:: The long double function support of libm.
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* Index::
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@end menu
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@include targetdep.tex
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@node Reentrancy
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@chapter Reentrancy Properties of @code{libm}
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@cindex reentrancy
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@cindex @code{matherr} and reentrancy
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When a libm function detects an exceptional case, @code{errno} may be
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set, the @code{matherr} function may be called, and a error message
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may be written to the standard error stream. This behavior may not
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be reentrant.
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@c The exact behavior depends on the currently selected error handling
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@c mode (IEEE, POSIX, X/Open, or SVID).
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With reentrant C libraries like the Red Hat newlib C library, @code{errno} is
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a macro which expands to the per-thread error value. This makes it thread
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safe.
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When the user provides his own @code{matherr} function it must be
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reentrant for the math library as a whole to be reentrant.
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In normal debugged programs, there are usually no math subroutine
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errors---and therefore no assignments to @code{errno} and no @code{matherr}
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calls; in that situation, the math functions behave reentrantly.
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@node Long Double Functions
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@chapter The long double function support of @code{libm}
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Currently, the full set of long double math functions is only provided
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on platforms where long double equals double.
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For such platforms, the long double math functions are implemented as calls to the double versions.
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@node Index
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@unnumbered Index
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@printindex cp
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@tex
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% I think something like @colophon should be in texinfo. In the
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% meantime:
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\long\def\colophon{\hbox to0pt{}\vfill
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\centerline{The body of this manual is set in}
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\centerline{\fontname\tenrm,}
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\centerline{with headings in {\bf\fontname\tenbf}}
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\centerline{and examples in {\tt\fontname\tentt}.}
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\centerline{{\it\fontname\tenit\/} and}
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\centerline{{\sl\fontname\tensl\/}}
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\centerline{are used for emphasis.}\vfill}
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\page\colophon
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% Blame: pesch@cygnus.com, 28mar91.
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@end tex
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@contents
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@bye
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