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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>Headers</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_13"></a>Headers</h2><p>This chapter describes the contents of headers.</p><p>Headers contain function prototypes, the definition of symbolic constants, common structures, preprocessor macros, and definedtypes. Each function in the System Interfaces volume of IEEE Std 1003.1-2001 specifies the headers that an applicationshall include in order to use that function. In most cases, only one header is required. These headers are present on anapplication development system; they need not be present on the target execution system.</p><h3><a name="tag_13_01"></a>Format of Entries</h3><p>The entries in this chapter are based on a common format as follows. The only sections relating to conformance are the SYNOPSISand DESCRIPTION.</p><dl compact><dt><b>NAME</b></dt><dd><br>This section gives the name or names of the entry and briefly states its purpose.</dd><dt><b>SYNOPSIS</b></dt><dd><br>This section summarizes the use of the entry being described.</dd><dt><b>DESCRIPTION</b></dt><dd><br>This section describes the functionality of the header.</dd><dt><b>APPLICATION USAGE</b></dt><dd><br>This section is informative. <p>This section gives warnings and advice to application writers about the entry. In the event of conflict between warnings andadvice and a normative part of this volume of IEEE Std 1003.1-2001, the normative material is to be taken as correct.</p></dd><dt><b>RATIONALE</b></dt><dd><br>This section is informative. <p>This section contains historical information concerning the contents of this volume of IEEE Std 1003.1-2001 and whyfeatures were included or discarded by the standard developers.</p></dd><dt><b>FUTURE DIRECTIONS</b></dt><dd><br>This section is informative. <p>This section provides comments which should be used as a guide to current thinking; there is not necessarily a commitment toadopt these future directions.</p></dd><dt><b>SEE ALSO</b></dt><dd><br>This section is informative. <p>This section gives references to related information.</p></dd><dt><b>CHANGE HISTORY</b></dt><dd><br>This section is informative. <p>This section shows the derivation of the entry and any significant changes that have been made to it.</p></dd></dl><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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