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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><ndbm.h></title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="<ndbm.h>"></a> <a name="tag_13_29"></a><!-- <ndbm.h> --> <!--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><h4><a name="tag_13_29_01"></a>NAME</h4><blockquote>ndbm.h - definitions for ndbm database operations</blockquote><h4><a name="tag_13_29_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <ndbm.h> <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></div></blockquote><h4><a name="tag_13_29_03"></a>DESCRIPTION</h4><blockquote><p>The <i><ndbm.h></i> header shall define the <b>datum</b> type as a structure that includes at least the followingmembers:</p><pre><tt>void *dptr </tt> A pointer to the application's data. <tt>size_t dsize</tt> The size of the object pointed to by <i>dptr.</i> <tt></tt></pre><p>The <b>size_t</b> type shall be defined as described in <a href="stddef.h.html"><i><stddef.h></i></a> .</p><p>The <i><ndbm.h></i> header shall define the <b>DBM</b> type.</p><p>The following constants shall be defined as possible values for the <i>store_mode</i> argument to <a href="../functions/dbm_store.html"><i>dbm_store</i>()</a>:</p><dl compact><dt>DBM_INSERT</dt><dd>Insertion of new entries only.</dd><dt>DBM_REPLACE</dt><dd>Allow replacing existing entries.</dd></dl><p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p><pre><tt>int dbm_clearerr(DBM *);void dbm_close(DBM *);int dbm_delete(DBM *, datum);int dbm_error(DBM *);datum dbm_fetch(DBM *, datum);datum dbm_firstkey(DBM *);datum dbm_nextkey(DBM *);DBM *dbm_open(const char *, int, mode_t);int dbm_store(DBM *, datum, datum, int);</tt></pre><p>The <b>mode_t</b> type shall be defined through <b>typedef</b> as described in <a href="sys/types.h.html"><i><sys/types.h></i></a> .</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_13_29_04"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_29_05"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_29_06"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_29_07"></a>SEE ALSO</h4><blockquote><p><a href="stddef.h.html"><i><stddef.h></i></a> , <a href="sys/types.h.html"><i><sys/types.h></i></a> , the SystemInterfaces volume of IEEE Std 1003.1-2001, <a href="../functions/dbm_clearerr.html"><i>dbm_clearerr</i>()</a></p></blockquote><h4><a name="tag_13_29_08"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4, Version 2.</p></blockquote><h4><a name="tag_13_29_09"></a>Issue 5</h4><blockquote><p>References to the definitions of <b>size_t</b> and <b>mode_t</b> are added to the DESCRIPTION.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><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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