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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>Rationale for System Interfaces</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_03"></a>Rationale for System Interfaces</h2><h3><a name="tag_03_01"></a>Introduction</h3><h4><a name="tag_03_01_01"></a>Scope</h4><p>Refer to <a href="xbd_chap01.html#tag_01_01_01"><i>Scope</i></a> .</p><h4><a name="tag_03_01_02"></a>Conformance</h4><p>Refer to <a href="xbd_chap02.html#tag_01_02"><i>Conformance</i></a> .</p><h4><a name="tag_03_01_03"></a>Normative References</h4><p>There is no additional rationale provided for this section.</p><h4><a name="tag_03_01_04"></a>Change History</h4><p>The change history is provided as an informative section, to track changes from previous issues ofIEEE Std 1003.1-2001.</p><p>The following sections describe changes made to the System Interfaces volume of IEEE Std 1003.1-2001 since Issue 5 ofthe base document. The CHANGE HISTORY section for each entry details the technical changes that have been made to that entry fromIssue 5. Changes between earlier issues of the base document and Issue 5 are not included.</p><p>The change history between Issue 5 and Issue 6 also lists the changes since the ISO POSIX-1:1996 standard.</p><h5><a name="tag_03_01_04_01"></a>Changes from Issue 5 to Issue 6 (IEEE Std 1003.1-2001)</h5><p>The following list summarizes the major changes that were made in the System Interfaces volume of IEEE Std 1003.1-2001from Issue 5 to Issue 6:</p><ul><li><p>This volume of IEEE Std 1003.1-2001 is extensively revised so that it can be both an IEEE POSIX Standard and an OpenGroup Technical Standard.</p></li><li><p>The POSIX System Interfaces requirements incorporate support of FIPS 151-2.</p></li><li><p>The POSIX System Interfaces requirements are updated to align with some features of the Single UNIX Specification.</p></li><li><p>A RATIONALE section is added to each reference page.</p></li><li><p>Networking interfaces from the XNS, Issue 5.2 specification are incorporated.</p></li><li><p>IEEE Std 1003.1d-1999 is incorporated.</p></li><li><p>IEEE Std 1003.1j-2000 is incorporated.</p></li><li><p>IEEE Std 1003.1q-2000 is incorporated.</p></li><li><p>IEEE P1003.1a draft standard is incorporated.</p></li><li><p>Existing functionality is aligned with the ISO/IEC 9899:1999 standard.</p></li><li><p>New functionality from the ISO/IEC 9899:1999 standard is incorporated.</p></li><li><p>IEEE PASC Interpretations are applied.</p></li><li><p>The Open Group corrigenda and resolutions are applied.</p></li></ul><h5><a name="tag_03_01_04_02"></a>New Features in Issue 6</h5><p>The functions first introduced in Issue 6 (over the Issue 5 Base document) are listed in the table below:</p><center><table border="1" cellpadding="3" align="center"><tr valign="top"><th colspan="3" align="center"><p class="tent"><b>New Functions in Issue 6</b></p></th></tr><tr valign="top"><td align="left"><p class="tent"><br><a href="../functions/acosf.html"><i>acosf</i>()</a><br><a href="../functions/acoshf.html"><i>acoshf</i>()</a><br><a href="../functions/acoshl.html"><i>acoshl</i>()</a><br><a href="../functions/acosl.html"><i>acosl</i>()</a><br><a href="../functions/asinf.html"><i>asinf</i>()</a><br><a href="../functions/asinhf.html"><i>asinhf</i>()</a><br><a href="../functions/asinhl.html"><i>asinhl</i>()</a><br><a href="../functions/asinl.html"><i>asinl</i>()</a><br><a href="../functions/atan2f.html"><i>atan2f</i>()</a><br><a href="../functions/atan2l.html"><i>atan2l</i>()</a><br><a href="../functions/atanf.html"><i>atanf</i>()</a><br><a href="../functions/atanhf.html"><i>atanhf</i>()</a><br><a href="../functions/atanhl.html"><i>atanhl</i>()</a><br><a href="../functions/atanl.html"><i>atanl</i>()</a><br><a href="../functions/atoll.html"><i>atoll</i>()</a><br><a href="../functions/cabs.html"><i>cabs</i>()</a><br><a href="../functions/cabsf.html"><i>cabsf</i>()</a><br><a href="../functions/cabsl.html"><i>cabsl</i>()</a><br><a href="../functions/cacos.html"><i>cacos</i>()</a><br><a href="../functions/cacosf.html"><i>cacosf</i>()</a><br><a href="../functions/cacosh.html"><i>cacosh</i>()</a><br><a href="../functions/cacoshf.html"><i>cacoshf</i>()</a><br><a href="../functions/cacoshl.html"><i>cacoshl</i>()</a><br><a href="../functions/cacosl.html"><i>cacosl</i>()</a><br><a href="../functions/carg.html"><i>carg</i>()</a><br><a href="../functions/cargf.html"><i>cargf</i>()</a><br><a href="../functions/cargl.html"><i>cargl</i>()</a><br><a href="../functions/casin.html"><i>casin</i>()</a><br><a href="../functions/casinf.html"><i>casinf</i>()</a><br><a href="../functions/casinh.html"><i>casinh</i>()</a><br><a href="../functions/casinhf.html"><i>casinhf</i>()</a><br><a href="../functions/casinhl.html"><i>casinhl</i>()</a><br><a href="../functions/casinl.html"><i>casinl</i>()</a><br><a href="../functions/catan.html"><i>catan</i>()</a><br><a href="../functions/catanf.html"><i>catanf</i>()</a><br><a href="../functions/catanh.html"><i>catanh</i>()</a><br><a href="../functions/catanhf.html"><i>catanhf</i>()</a><br> </p></td><td align="left"><p class="tent"><br><a href="../functions/catanhl.html"><i>catanhl</i>()</a><br><a href="../functions/catanl.html"><i>catanl</i>()</a><br><a href="../functions/cbrtf.html"><i>cbrtf</i>()</a><br><a href="../functions/cbrtl.html"><i>cbrtl</i>()</a><br><a href="../functions/ccos.html"><i>ccos</i>()</a><br><a href="../functions/ccosf.html"><i>ccosf</i>()</a><br><a href="../functions/ccosh.html"><i>ccosh</i>()</a><br><a href="../functions/ccoshf.html"><i>ccoshf</i>()</a><br><a href="../functions/ccoshl.html"><i>ccoshl</i>()</a><br><a href="../functions/ccosl.html"><i>ccosl</i>()</a><br><a href="../functions/ceilf.html"><i>ceilf</i>()</a><br><a href="../functions/ceill.html"><i>ceill</i>()</a><br><a href="../functions/cexp.html"><i>cexp</i>()</a><br><a href="../functions/cexpf.html"><i>cexpf</i>()</a><br><a href="../functions/cexpl.html"><i>cexpl</i>()</a><br><a href="../functions/cimag.html"><i>cimag</i>()</a><br><a href="../functions/cimagf.html"><i>cimagf</i>()</a><br><a href="../functions/cimagl.html"><i>cimagl</i>()</a><br><a href="../functions/clock_getcpuclockid.html"><i>clock_getcpuclockid</i>()</a><br><a href="../functions/clock_nanosleep.html"><i>clock_nanosleep</i>()</a><br><a href="../functions/clog.html"><i>clog</i>()</a><br><a href="../functions/clogf.html"><i>clogf</i>()</a><br><a href="../functions/clogl.html"><i>clogl</i>()</a><br><a href="../functions/conj.html"><i>conj</i>()</a><br><a href="../functions/conjf.html"><i>conjf</i>()</a><br><a href="../functions/conjl.html"><i>conjl</i>()</a><br><a href="../functions/copysign.html"><i>copysign</i>()</a><br><a href="../functions/copysignf.html"><i>copysignf</i>()</a><br><a href="../functions/copysignl.html"><i>copysignl</i>()</a><br><a href="../functions/cosf.html"><i>cosf</i>()</a><br><a href="../functions/coshf.html"><i>coshf</i>()</a><br><a href="../functions/coshl.html"><i>coshl</i>()</a><br><a href="../functions/cosl.html"><i>cosl</i>()</a><br><a href="../functions/cpow.html"><i>cpow</i>()</a><br><a href="../functions/cpowf.html"><i>cpowf</i>()</a><br><a href="../functions/cpowl.html"><i>cpowl</i>()</a><br><a href="../functions/cproj.html"><i>cproj</i>()</a><br> </p></td><td align="left"><p class="tent"><br><a href="../functions/cprojf.html"><i>cprojf</i>()</a><br><a href="../functions/cprojl.html"><i>cprojl</i>()</a><br><a href="../functions/creal.html"><i>creal</i>()</a><br><a href="../functions/crealf.html"><i>crealf</i>()</a><br><a href="../functions/creall.html"><i>creall</i>()</a><br><a href="../functions/csin.html"><i>csin</i>()</a><br><a href="../functions/csinf.html"><i>csinf</i>()</a><br><a href="../functions/csinh.html"><i>csinh</i>()</a><br><a href="../functions/csinhf.html"><i>csinhf</i>()</a><br><a href="../functions/csinhl.html"><i>csinhl</i>()</a><br><a href="../functions/csinl.html"><i>csinl</i>()</a><br><a href="../functions/csqrt.html"><i>csqrt</i>()</a><br><a href="../functions/csqrtf.html"><i>csqrtf</i>()</a><br><a href="../functions/csqrtl.html"><i>csqrtl</i>()</a><br><a href="../functions/ctan.html"><i>ctan</i>()</a><br><a href="../functions/ctanf.html"><i>ctanf</i>()</a><br><a href="../functions/ctanh.html"><i>ctanh</i>()</a><br><a href="../functions/ctanhf.html"><i>ctanhf</i>()</a><br><a href="../functions/ctanhl.html"><i>ctanhl</i>()</a><br><a href="../functions/ctanl.html"><i>ctanl</i>()</a><br><a href="../functions/erfcf.html"><i>erfcf</i>()</a><br><a href="../functions/erfcl.html"><i>erfcl</i>()</a><br><a href="../functions/erff.html"><i>erff</i>()</a><br>⌨️ 快捷键说明
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