136 lines
4.8 KiB
HTML
136 lines
4.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>endhostent</title>
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<body bgcolor="white">
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<basefont size="3"> <a name="endhostent"></a> <a name="tag_03_118"></a><!-- endhostent -->
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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_03_118_01"></a>NAME</h4>
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<blockquote>endhostent, gethostent, sethostent - network host database functions</blockquote>
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<h4><a name="tag_03_118_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/netdb.h.html">netdb.h</a>><br>
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<br>
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void endhostent(void);<br>
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struct hostent *gethostent(void);<br>
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void sethostent(int</tt> <i>stayopen</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_118_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>These functions shall retrieve information about hosts. This information is considered to be stored in a database that can be
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accessed sequentially or randomly. The implementation of this database is unspecified. <basefont size="2"></p>
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<dl>
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<dt><b>Note:</b></dt>
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<dd>In many cases this database is implemented by the Domain Name System, as documented in RFC 1034, RFC 1035, and
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RFC 1886.</dd>
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</dl>
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<basefont size="3">
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<p>The <i>sethostent</i>() function shall open a connection to the database and set the next entry for retrieval to the first entry
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in the database. If the <i>stayopen</i> argument is non-zero, the connection shall not be closed by a call to <i>gethostent</i>(),
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<a href="../functions/gethostbyname.html"><i>gethostbyname</i>()</a>, or <a href=
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"../functions/gethostbyaddr.html"><i>gethostbyaddr</i>()</a>, and the implementation may maintain an open file descriptor.</p>
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<p>The <i>gethostent</i>() function shall read the next entry in the database, opening and closing a connection to the database as
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necessary.</p>
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<p>Entries shall be returned in <b>hostent</b> structures. Refer to <a href="gethostbyaddr.html"><i>gethostbyaddr</i>()</a> for a
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definition of the <b>hostent</b> structure.</p>
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<p>The <i>endhostent</i>() function shall close the connection to the database, releasing any open file descriptor.</p>
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<p>These functions need not be reentrant. A function that is not required to be reentrant is not required to be thread-safe.</p>
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</blockquote>
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<h4><a name="tag_03_118_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, the <i>gethostent</i>() function shall return a pointer to a <b>hostent</b> structure if the
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requested entry was found, and a null pointer if the end of the database was reached or the requested entry was not found.</p>
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</blockquote>
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<h4><a name="tag_03_118_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined for <i>endhostent</i>(), <i>gethostent</i>(), and <i>sethostent</i>().</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_03_118_06"></a>EXAMPLES</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_03_118_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The <i>gethostent</i>() function may return pointers to static data, which may be overwritten by subsequent calls to any of
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these functions.</p>
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</blockquote>
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<h4><a name="tag_03_118_08"></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_03_118_09"></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_03_118_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="endservent.html"><i>endservent</i>()</a> , <a href="gethostbyaddr.html"><i>gethostbyaddr</i>()</a> , the Base
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Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/netdb.h.html"><i><netdb.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_118_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 6. Derived from the XNS, Issue 5.2 specification.</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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