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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>Subprofiling Considerations (Informative)</title></head><body bgcolor="white"><basefont size="3"> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h2><a name="tag_05"></a>Subprofiling Considerations (Informative)</h2><p>This section contains further information to satisfy the requirement that the project scope enable subprofiling ofIEEE Std 1003.1-2001. The original intent was to have included a set of options similar to the "Units of Functionality''contained in IEEE Std 1003.13-1998. However, as the development of IEEE Std 1003.1-2001 continued, the standarddevelopers felt it premature to fix these in normative text. The approach instead has been to include a general requirement innormative text regarding subprofiling and to include an informative section (here) containing a proposed set of subprofilingoptions.</p><h3><a name="tag_05_01"></a>Subprofiling Option Groups</h3><p>The following Option Groups<a href="#tag_foot_1"><sup><small>1</small></sup></a> are defined to support profiling. Systemsclaiming support to IEEE Std 1003.1-2001 need not implement these options apart from the requirements stated in the BaseDefinitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap02.html#tag_02_01_03">Section 2.1.3, POSIXConformance</a>. These Option Groups allow profiles to subset the System Interfaces volume of IEEE Std 1003.1-2001 bycollecting sets of related functions.</p><dl compact><dt>POSIX_C_LANG_JUMP: Jump Functions</dt><dd><a href="../functions/longjmp.html"><i>longjmp</i>()</a>, <a href="../functions/setjmp.html"><i>setjmp</i>()</a></dd><dt>POSIX_C_LANG_MATH: Maths Library</dt><dd><a href="../functions/acos.html"><i>acos</i>()</a>, <a href="../functions/acosf.html"><i>acosf</i>()</a>, <a href="../functions/acosh.html"><i>acosh</i>()</a>, <a href="../functions/acoshf.html"><i>acoshf</i>()</a>, <a href="../functions/acoshl.html"><i>acoshl</i>()</a>, <a href="../functions/acosl.html"><i>acosl</i>()</a>, <a href="../functions/asin.html"><i>asin</i>()</a>, <a href="../functions/asinf.html"><i>asinf</i>()</a>, <a href="../functions/asinh.html"><i>asinh</i>()</a>, <a href="../functions/asinhf.html"><i>asinhf</i>()</a>, <a href="../functions/asinhl.html"><i>asinhl</i>()</a>, <a href="../functions/asinl.html"><i>asinl</i>()</a>, <a href="../functions/atan.html"><i>atan</i>()</a>, <a href="../functions/atan2.html"><i>atan2</i>()</a>, <a href="../functions/atan2f.html"><i>atan2f</i>()</a>, <a href="../functions/atan2l.html"><i>atan2l</i>()</a>, <a href="../functions/atanf.html"><i>atanf</i>()</a>, <a href="../functions/atanh.html"><i>atanh</i>()</a>, <a href="../functions/atanhf.html"><i>atanhf</i>()</a>, <a href="../functions/atanhl.html"><i>atanhl</i>()</a>, <a href="../functions/atanl.html"><i>atanl</i>()</a>, <a href="../functions/cabs.html"><i>cabs</i>()</a>, <a href="../functions/cabsf.html"><i>cabsf</i>()</a>, <a href="../functions/cabsl.html"><i>cabsl</i>()</a>, <a href="../functions/cacos.html"><i>cacos</i>()</a>, <a href="../functions/cacosf.html"><i>cacosf</i>()</a>, <a href="../functions/cacosh.html"><i>cacosh</i>()</a>, <a href="../functions/cacoshf.html"><i>cacoshf</i>()</a>, <a href="../functions/cacoshl.html"><i>cacoshl</i>()</a>, <a href="../functions/cacosl.html"><i>cacosl</i>()</a>, <a href="../functions/carg.html"><i>carg</i>()</a>, <a href="../functions/cargf.html"><i>cargf</i>()</a>, <a href="../functions/cargl.html"><i>cargl</i>()</a>, <a href="../functions/casin.html"><i>casin</i>()</a>, <a href="../functions/casinf.html"><i>casinf</i>()</a>, <a href="../functions/casinh.html"><i>casinh</i>()</a>, <a href="../functions/casinhf.html"><i>casinhf</i>()</a>, <a href="../functions/casinhl.html"><i>casinhl</i>()</a>, <a href="../functions/casinl.html"><i>casinl</i>()</a>, <a href="../functions/catan.html"><i>catan</i>()</a>, <a href="../functions/catanf.html"><i>catanf</i>()</a>, <a href="../functions/catanh.html"><i>catanh</i>()</a>, <a href="../functions/catanhf.html"><i>catanhf</i>()</a>, <a href="../functions/catanhl.html"><i>catanhl</i>()</a>, <a href="../functions/catanl.html"><i>catanl</i>()</a>, <a href="../functions/cbrt.html"><i>cbrt</i>()</a>, <a href="../functions/cbrtf.html"><i>cbrtf</i>()</a>, <a href="../functions/cbrtl.html"><i>cbrtl</i>()</a>, <a href="../functions/ccos.html"><i>ccos</i>()</a>, <a href="../functions/ccosf.html"><i>ccosf</i>()</a>, <a href="../functions/ccosh.html"><i>ccosh</i>()</a>, <a href="../functions/ccoshf.html"><i>ccoshf</i>()</a>, <a href="../functions/ccoshl.html"><i>ccoshl</i>()</a>, <a href="../functions/ccosl.html"><i>ccosl</i>()</a>, <a href="../functions/ceil.html"><i>ceil</i>()</a>, <a href="../functions/ceilf.html"><i>ceilf</i>()</a>, <a href="../functions/ceill.html"><i>ceill</i>()</a>, <a href="../functions/cexp.html"><i>cexp</i>()</a>, <a href="../functions/cexpf.html"><i>cexpf</i>()</a>, <a href="../functions/cexpl.html"><i>cexpl</i>()</a>, <a href="../functions/cimag.html"><i>cimag</i>()</a>, <a href="../functions/cimagf.html"><i>cimagf</i>()</a>, <a href="../functions/cimagl.html"><i>cimagl</i>()</a>, <a href="../functions/clog.html"><i>clog</i>()</a>, <a href="../functions/clogf.html"><i>clogf</i>()</a>, <a 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href="../functions/cprojl.html"><i>cprojl</i>()</a>, <a href="../functions/creal.html"><i>creal</i>()</a>, <a href="../functions/crealf.html"><i>crealf</i>()</a>, <a href="../functions/creall.html"><i>creall</i>()</a>, <a href="../functions/csin.html"><i>csin</i>()</a>, <a href="../functions/csinf.html"><i>csinf</i>()</a>, <a href="../functions/csinh.html"><i>csinh</i>()</a>, <a href="../functions/csinhf.html"><i>csinhf</i>()</a>, <a href="../functions/csinhl.html"><i>csinhl</i>()</a>, <a href="../functions/csinl.html"><i>csinl</i>()</a>, <a href="../functions/csqrt.html"><i>csqrt</i>()</a>, <a href="../functions/csqrtf.html"><i>csqrtf</i>()</a>, <a href="../functions/csqrtl.html"><i>csqrtl</i>()</a>, <a href="../functions/ctan.html"><i>ctan</i>()</a>, <a href="../functions/ctanf.html"><i>ctanf</i>()</a>, <a href="../functions/ctanh.html"><i>ctanh</i>()</a>, <a href="../functions/ctanhf.html"><i>ctanhf</i>()</a>, <a href="../functions/ctanhl.html"><i>ctanhl</i>()</a>, <a 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href="../functions/fabsl.html"><i>fabsl</i>()</a>, <a href="../functions/fdim.html"><i>fdim</i>()</a>, <a href="../functions/fdimf.html"><i>fdimf</i>()</a>, <a href="../functions/fdiml.html"><i>fdiml</i>()</a>, <a href="../functions/floor.html"><i>floor</i>()</a>, <a href="../functions/floorf.html"><i>floorf</i>()</a>, <a href="../functions/floorl.html"><i>floorl</i>()</a>, <a href="../functions/fma.html"><i>fma</i>()</a>, <a href="../functions/fmaf.html"><i>fmaf</i>()</a>, <a href="../functions/fmal.html"><i>fmal</i>()</a>, <a href="../functions/fmax.html"><i>fmax</i>()</a>, <a href="../functions/fmaxf.html"><i>fmaxf</i>()</a>, <a href="../functions/fmaxl.html"><i>fmaxl</i>()</a>, <a href="../functions/fmin.html"><i>fmin</i>()</a>, <a href="../functions/fminf.html"><i>fminf</i>()</a>, <a href="../functions/fminl.html"><i>fminl</i>()</a>, <a href="../functions/fmod.html"><i>fmod</i>()</a>, <a href="../functions/fmodf.html"><i>fmodf</i>()</a>, <a href="../functions/fmodl.html"><i>fmodl</i>()</a>, <a href="../functions/fpclassify.html"><i>fpclassify</i>()</a>, <a href="../functions/frexp.html"><i>frexp</i>()</a>, <a href="../functions/frexpf.html"><i>frexpf</i>()</a>, <a href="../functions/frexpl.html"><i>frexpl</i>()</a>, <a href="../functions/hypot.html"><i>hypot</i>()</a>, <a href="../functions/hypotf.html"><i>hypotf</i>()</a>, <a href="../functions/hypotl.html"><i>hypotl</i>()</a>, <a href="../functions/ilogb.html"><i>ilogb</i>()</a>, <a href="../functions/ilogbf.html"><i>ilogbf</i>()</a>, <a href="../functions/ilogbl.html"><i>ilogbl</i>()</a>, <a href="../functions/isfinite.html"><i>isfinite</i>()</a>, <a href="../functions/isgreater.html"><i>isgreater</i>()</a>, <a href="../functions/isgreaterequal.html"><i>isgreaterequal</i>()</a>, <a href="../functions/isinf.html"><i>isinf</i>()</a>, <a href="../functions/isless.html"><i>isless</i>()</a>, <a href="../functions/islessequal.html"><i>islessequal</i>()</a>, <a href="../functions/islessgreater.html"><i>islessgreater</i>()</a>, <a href="../functions/isnan.html"><i>isnan</i>()</a>, <a href="../functions/isnormal.html"><i>isnormal</i>()</a>, <a href="../functions/isunordered.html"><i>isunordered</i>()</a>, <a href="../functions/ldexp.html"><i>ldexp</i>()</a>, <a href="../functions/ldexpf.html"><i>ldexpf</i>()</a>, <a href="../functions/ldexpl.html"><i>ldexpl</i>()</a>, <a href="../functions/lgamma.html"><i>lgamma</i>()</a>, <a href="../functions/lgammaf.html"><i>lgammaf</i>()</a>, <a href="../functions/lgammal.html"><i>lgammal</i>()</a>, <a href="../functions/llrint.html"><i>llrint</i>()</a>, <a href="../functions/llrintf.html"><i>llrintf</i>()</a>, <a href="../functions/llrintl.html"><i>llrintl</i>()</a>, <a href="../functions/llround.html"><i>llround</i>()</a>, <a href="../functions/llroundf.html"><i>llroundf</i>()</a>, <a href="../functions/llroundl.html"><i>llroundl</i>()</a>, <a href="../functions/log.html"><i>log</i>()</a>, <a href="../functions/log10.html"><i>log10</i>()</a>, <a href="../functions/log10f.html"><i>log10f</i>()</a>, <a href="../functions/log10l.html"><i>log10l</i>()</a>, <a href="../functions/log1p.html"><i>log1p</i>()</a>, <a href="../functions/log1pf.html"><i>log1pf</i>()</a>, <a href="../functions/log1pl.html"><i>log1pl</i>()</a>, <a href="../functions/log2.html"><i>log2</i>()</a>, <a href="../functions/log2f.html"><i>log2f</i>()</a>, <a href="../functions/log2l.html"><i>log2l</i>()</a>, <a href="../functions/logb.html"><i>logb</i>()</a>, <a href="../functions/logbf.html"><i>logbf</i>()</a>, <a href="../functions/logbl.html"><i>logbl</i>()</a>, <a href="../functions/logf.html"><i>logf</i>()</a>, <a href="../functions/logl.html"><i>logl</i>()</a>, <a href="../functions/lrint.html"><i>lrint</i>()</a>, <a href="../functions/lrintf.html"><i>lrintf</i>()</a>, <a href="../functions/lrintl.html"><i>lrintl</i>()</a>, <a href="../functions/lround.html"><i>lround</i>()</a>, <a href="../functions/lroundf.html"><i>lroundf</i>()</a>, <a href="../functions/lroundl.html"><i>lroundl</i>()</a>, <a href="../functions/modf.html"><i>modf</i>()</a>, <a href="../functions/modff.html"><i>modff</i>()</a>, <a href="../functions/modfl.html"><i>modfl</i>()</a>, <a href="../functions/nan.html"><i>nan</i>()</a>, <a href="../functions/nanf.html"><i>nanf</i>()</a>, <a href="../functions/nanl.html"><i>nanl</i>()</a>, <a href="../functions/nearbyint.html"><i>nearbyint</i>()</a>, <a href="../functions/nearbyintf.html"><i>nearbyintf</i>()</a>, <a href="../functions/nearbyintl.html"><i>nearbyintl</i>()</a>, <a href="../functions/nextafter.html"><i>nextafter</i>()</a>, <a href="../functions/nextafterf.html"><i>nextafterf</i>()</a>, <a href="../functions/nextafterl.html"><i>nextafterl</i>()</a>, <a href="../functions/nexttoward.html"><i>nexttoward</i>()</a>, <a href="../functions/nexttowardf.html"><i>nexttowardf</i>()</a>, <a href="../functions/nexttowardl.html"><i>nexttowardl</i>()</a>, <ahref="../functions/pow.html"><i>pow</i>()</a>, <a href="../functions/powf.html"><i>powf</i>()</a>, <a href="../functions/powl.html"><i>powl</i>()</a>, <a href="../functions/remainder.html"><i>remainder</i>()</a>, <a href="../functions/remainderf.html"><i>remainderf</i>()</a>, <a href="../functions/remainderl.html"><i>remainderl</i>()</a>, <a href="../functions/remquo.html"><i>remquo</i>()</a>, <a href="../functions/remquof.html"><i>remquof</i>()</a>, <a href="../functions/remquol.html"><i>remquol</i>()</a>, <a href="../functions/rint.html"><i>rint</i>()</a>, <a href="../functions/rintf.html"><i>rintf</i>()</a>, <a href="../functions/rintl.html"><i>rintl</i>()</a>, <a href="../functions/round.html"><i>round</i>()</a>, <a href="../functions/roundf.html"><i>roundf</i>()</a>, <a href="../functions/roundl.html"><i>roundl</i>()</a>, <a href="../functions/scalbln.html"><i>scalbln</i>()</a>, <a href="../functions/scalblnf.html"><i>scalblnf</i>()</a>, <a href="../functions/scalblnl.html"><i>scalblnl</i>()</a>, <a href="../functions/scalbn.html"><i>scalbn</i>()</a>, <a href="../functions/scalbnf.html"><i>scalbnf</i>()</a>, <a href="../functions/scalbnl.html"><i>scalbnl</i>()</a>, <a href="../functions/signbit.html"><i>signbit</i>()</a>, <a href="../functions/sin.html"><i>sin</i>()</a>, <a href="../functions/sinf.html"><i>sinf</i>()</a>, <a href="../functions/sinh.html"><i>sinh</i>()</a>, <a href="../functions/sinhf.html"><i>sinhf</i>()</a>, <a href="../functions/sinhl.html"><i>sinhl</i>()</a>, <a href="../functions/sinl.html"><i>sinl</i>()</a>, <a href="../functions/sqrt.html"><i>sqrt</i>()</a>, <a href="../functions/sqrtf.html"><i>sqrtf</i>()</a>, <a href="../functions/sqrtl.html"><i>sqrtl</i>()</a>, <a href="../functions/tan.html"><i>tan</i>()</a>, <a href="../functions/tanf.html"><i>tanf</i>()</a>, <a href="../functions/tanh.html"><i>tanh</i>()</a>, <a href="../functions/tanhf.html"><i>tanhf</i>()</a>, <a href="../functions/tanhl.html"><i>tanhl</i>()</a>, <a href="../functions/tanl.html"><i>tanl</i>()</a>, <a href="../functions/tgamma.html"><i>tgamma</i>()</a>, <a href="../functions/tgammaf.html"><i>tgammaf</i>()</a>, <a href="../functions/tgammal.html"><i>tgammal</i>()</a>, <a href="../functions/trunc.html"><i>trunc</i>()</a>, <a href="../functions/truncf.html"><i>truncf</i>()</a>, <a href="../functions/truncl.html"><i>truncl</i>()</a></dd><dt>POSIX_C_LANG_SUPPORT: General ISO C Library</dt><dd><a href="../functions/abs.html"><i>abs</i>()</a>, <a href="../functions/asctime.html"><i>asctime</i>()</a>, <a href="../functions/atof.html"><i>atof</i>()</a>, <a href="../functions/atoi.html"><i>atoi</i>()</a>, <a href="../functions/atol.html"><i>atol</i>()</a>, <a href="../functions/atoll.html"><i>atoll</i>()</a>, <a href="../functions/bsearch.html"><i>bsearch</i>()</a>, <a href="../functions/calloc.html"><i>calloc</i>()</a>, <a href="../functions/ctime.html"><i>ctime</i>()</a>, <a href="../functions/difftime.html"><i>difftime</i>()</a>, <a href="../functions/div.html"><i>div</i>()</a>, <a href="../functions/feclearexcept.html"><i>feclearexcept</i>()</a>, <a href="../functions/fegetenv.html"><i>fegetenv</i>()</a>, <a href="../functions/fegetexceptflag.html"><i>fegetexceptflag</i>()</a>, <a⌨️ 快捷键说明
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