137 lines
4.2 KiB
HTML
137 lines
4.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title><ndbm.h></title>
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</head>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="<ndbm.h>"></a> <a name="tag_13_29"></a><!-- <ndbm.h> -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_13_29_01"></a>NAME</h4>
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<blockquote>ndbm.h - definitions for ndbm database operations</blockquote>
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<h4><a name="tag_13_29_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <ndbm.h> <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></div>
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</blockquote>
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<h4><a name="tag_13_29_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i><ndbm.h></i> header shall define the <b>datum</b> type as a structure that includes at least the following
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members:</p>
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<pre>
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<tt>void *dptr </tt> A pointer to the application's data. <tt>
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size_t dsize</tt> The size of the object pointed to by <i>dptr.</i> <tt>
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</tt>
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</pre>
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<p>The <b>size_t</b> type shall be defined as described in <a href="stddef.h.html"><i><stddef.h></i></a> .</p>
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<p>The <i><ndbm.h></i> header shall define the <b>DBM</b> type.</p>
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<p>The following constants shall be defined as possible values for the <i>store_mode</i> argument to <a href=
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"../functions/dbm_store.html"><i>dbm_store</i>()</a>:</p>
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<dl compact>
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<dt>DBM_INSERT</dt>
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<dd>Insertion of new entries only.</dd>
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<dt>DBM_REPLACE</dt>
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<dd>Allow replacing existing entries.</dd>
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</dl>
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<p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p>
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<pre>
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<tt>int dbm_clearerr(DBM *);
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void dbm_close(DBM *);
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int dbm_delete(DBM *, datum);
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int dbm_error(DBM *);
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datum dbm_fetch(DBM *, datum);
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datum dbm_firstkey(DBM *);
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datum dbm_nextkey(DBM *);
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DBM *dbm_open(const char *, int, mode_t);
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int dbm_store(DBM *, datum, datum, int);
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</tt>
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</pre>
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<p>The <b>mode_t</b> type shall be defined through <b>typedef</b> as described in <a href=
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"sys/types.h.html"><i><sys/types.h></i></a> .</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_13_29_04"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_13_29_05"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_13_29_06"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_13_29_07"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="stddef.h.html"><i><stddef.h></i></a> , <a href="sys/types.h.html"><i><sys/types.h></i></a> , the System
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Interfaces volume of IEEE Std 1003.1-2001, <a href="../functions/dbm_clearerr.html"><i>dbm_clearerr</i>()</a></p>
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</blockquote>
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<h4><a name="tag_13_29_08"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 4, Version 2.</p>
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</blockquote>
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<h4><a name="tag_13_29_09"></a>Issue 5</h4>
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<blockquote>
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<p>References to the definitions of <b>size_t</b> and <b>mode_t</b> are added to the DESCRIPTION.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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UNIX ® is a registered Trademark of The Open Group.<br>
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POSIX ® is a registered Trademark of The IEEE.<br>
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"../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>
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