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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"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001 The Open Group, All Rights Reserved --><title>Codes</title></head><body bgcolor="white"><basefont size="3"> <center><font size="2"><br>The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group</font></center><hr size="2" noshade><center><i>This help file is not part of the standard, but is provided for information.</i></center><h4><a name="tag_01_05_01"></a>Codes</h4><p>The codes and their meanings are as follows. See also <a href="#tag_01_05_02">Margin Code Notation</a> which includes a note of differences in conventionbetween the printed PDF and HTML renditions of this standard.</p><a name="ADV"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">ADV</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Advisory Information <img src="../images/opt-end.gif" alt="[Option End]"border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>Where applicable, functions are marked with the ADV margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the ADV margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="AIO"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">AIO</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Asynchronous Input and Output <img src="../images/opt-end.gif" alt="[Option End]" border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>Where applicable, functions are marked with the AIO margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the AIO margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="BAR"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">BAR</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Barriers <img src="../images/opt-end.gif" alt="[Option End]" border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>Where applicable, functions are marked with the BAR margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the BAR margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="BE"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">BE</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Batch Environment Services and Utilities <img src="../images/opt-end.gif" alt="[Option End]" border="0"></span><br> The functionality described is optional.</p><p>Where applicable, utilities are marked with the BE margin legend in the SYNOPSIS section. Where additional semantics apply to autility, the material is identified by use of the BE margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="CD"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">CD</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> C-Language Development Utilities <img src="../images/opt-end.gif" alt="[Option End]" border="0"></span><br> The functionality described is optional.</p><p>Where applicable, utilities are marked with the CD margin legend in the SYNOPSIS section. Where additional semantics apply to autility, the material is identified by use of the CD margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="CPT"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">CPT</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Process CPU-Time Clocks <img src="../images/opt-end.gif" alt="[Option End]" border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>Where applicable, functions are marked with the CPT margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the CPT margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="CS"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">CS</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Clock Selection <img src="../images/opt-end.gif" alt="[Option End]"border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>Where applicable, functions are marked with the CS margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the CS margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="CX"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">CX</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Extension to the ISO C standard <img src="../images/opt-end.gif"alt="[Option End]" border="0"></span><br> The functionality described is an extension to the ISO C standard. Application writers may make use of an extension as it issupported on all IEEE Std 1003.1-2001-conforming systems.</p><p>With each function or header from the ISO C standard, a statement to the effect that ``any conflict is unintentional'' isincluded. That is intended to refer to a direct conflict. IEEE Std 1003.1-2001 acts in part as a profile of theISO C standard, and it may choose to further constrain behaviors allowed to vary by the ISO C standard. Such limitationsare not considered conflicts.</p><p>Where additional semantics apply to a function or header, the material is identified by use of the CX margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="FD"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">FD</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> FORTRAN Development Utilities <img src="../images/opt-end.gif" alt="[Option End]" border="0"></span><br> The functionality described is optional.</p><p>Where applicable, utilities are marked with the FD margin legend in the SYNOPSIS section. Where additional semantics apply to autility, the material is identified by use of the FD margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="FR"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">FR</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> FORTRAN Runtime Utilities <img src="../images/opt-end.gif" alt="[Option End]" border="0"></span><br> The functionality described is optional.</p><p>Where applicable, utilities are marked with the FR margin legend in the SYNOPSIS section. Where additional semantics apply to autility, the material is identified by use of the FR margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="FSC"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">FSC</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> File Synchronization <img src="../images/opt-end.gif" alt="[Option End]"border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>Where applicable, functions are marked with the FSC margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the FSC margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="IP6"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">IP6</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> IPV6 <img src="../images/opt-end.gif" alt="[Option End]" border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>Where applicable, functions are marked with the IP6 margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the IP6 margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="MC1"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">MC1</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Advisory Information and either Memory Mapped Files or Shared MemoryObjects <img src="../images/opt-end.gif" alt="[Option End]" border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>This is a shorthand notation for combinations of multiple option codes.</p><p>Where applicable, functions are marked with the MC1 margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the MC1 margin legend.</p><p>Refer to <a href="#tag_01_05_02">Margin Code Notation</a> .</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="MC2"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">MC2</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Memory Mapped Files, Shared Memory Objects, or Memory Protection <imgsrc="../images/opt-end.gif" alt="[Option End]" border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>This is a shorthand notation for combinations of multiple option codes.</p><p>Where applicable, functions are marked with the MC2 margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the MC2 margin legend.</p><p>Refer to <a href="#tag_01_05_02">Margin Code Notation</a> .</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="MC3"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">MC3</a>]</tt> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">Memory Mapped Files, Shared Memory Objects, or Typed Memory Objects <img src="../images/opt-end.gif" alt="[Option End]" border="0"><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>This is a shorthand notation for combinations of multiple option codes.</p><p>Where applicable, functions are marked with the MC3 margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the MC3 margin legend.</p><p>Refer to <a href="#tag_01_05_02">Margin Code Notation</a> .</p><a name="MF"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">MF</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Memory Mapped Files <img src="../images/opt-end.gif" alt="[Option End]"border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>Where applicable, functions are marked with the MF margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the MF margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="ML"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">ML</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Process Memory Locking <img src="../images/opt-end.gif" alt="[Option End]" border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>Where applicable, functions are marked with the ML margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the ML margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="MR"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">MR</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Range Memory Locking <img src="../images/opt-end.gif" alt="[Option End]"border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>Where applicable, functions are marked with the MLR margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the MLR margin legend.</p><p><i>See help on <a href="#tag_01_05_02">Margin Code Notation</a></i>.</p><a name="MON"> </a><p><span class="shade"><tt>[<a href="../basedefs/xbd_chap01.html#tag_01_05_01">MON</a>]</tt><img src="../images/opt-start.gif" alt="[Option Start]" border="0"> Monotonic Clock <img src="../images/opt-end.gif" alt="[Option End]"border="0"></span><br> The functionality described is optional. The functionality described is also an extension to the ISO C standard.</p><p>Where applicable, functions are marked with the MON margin legend in the SYNOPSIS section. Where additional semantics apply to afunction, the material is identified by use of the MON margin legend.</p>⌨️ 快捷键说明
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