143 lines
6.0 KiB
HTML
143 lines
6.0 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>endservent</title>
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<body bgcolor="white">
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<basefont size="3"> <a name="endservent"></a> <a name="tag_03_122"></a><!-- endservent -->
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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_122_01"></a>NAME</h4>
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<blockquote>endservent, getservbyname, getservbyport, getservent, setservent - network services database functions</blockquote>
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<h4><a name="tag_03_122_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 endservent(void);<br>
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struct servent *getservbyname(const char *</tt><i>name</i><tt>, const char *</tt><i>proto</i><tt>);<br>
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struct servent *getservbyport(int</tt> <i>port</i><tt>, const char *</tt><i>proto</i><tt>);<br>
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struct servent *getservent(void);<br>
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void setservent(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_122_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>These functions shall retrieve information about network services. This information is considered to be stored in a database
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that can be accessed sequentially or randomly. The implementation of this database is unspecified.</p>
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<p>The <i>setservent</i>() function shall open a connection to the database, and set the next entry to the first entry. If the
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<i>stayopen</i> argument is non-zero, the <i>net</i> database shall not be closed after each call to the <i>getservent</i>()
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function (either directly, or indirectly through one of the other <a href="../functions/getservbyname.html"><i>getserv*</i>()</a>
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functions), and the implementation may maintain an open file descriptor for the database.</p>
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<p>The <i>getservent</i>() function shall read the next entry of the database, opening and closing a connection to the database as
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necessary.</p>
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<p>The <i>getservbyname</i>() function shall search the database from the beginning and find the first entry for which the service
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name specified by <i>name</i> matches the <i>s_name</i> member and the protocol name specified by <i>proto</i> matches the
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<i>s_proto</i> member, opening and closing a connection to the database as necessary. If <i>proto</i> is a null pointer, any value
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of the <i>s_proto</i> member shall be matched.</p>
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<p>The <i>getservbyport</i>() function shall search the database from the beginning and find the first entry for which the port
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specified by <i>port</i> matches the <i>s_port</i> member and the protocol name specified by <i>proto</i> matches the
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<i>s_proto</i> member, opening and closing a connection to the database as necessary. If <i>proto</i> is a null pointer, any value
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of the <i>s_proto</i> member shall be matched. The <i>port</i> argument shall be in network byte order.</p>
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<p>The <i>getservbyname</i>(), <i>getservbyport</i>(), and <i>getservent</i>() functions shall each return a pointer to a
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<b>servent</b> structure, the members of which shall contain the fields of an entry in the network services database.</p>
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<p>The <i>endservent</i>() function shall close 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_122_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>getservbyname</i>(), <i>getservbyport</i>(), and <i>getservent</i>() return a pointer to a
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<b>servent</b> structure if the requested entry was found, and a null pointer if the end of the database was reached or the
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requested entry was not found. Otherwise, a null pointer is returned.</p>
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</blockquote>
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<h4><a name="tag_03_122_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</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_122_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_122_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The <i>port</i> argument of <i>getservbyport</i>() need not be compatible with the port values of all address families.</p>
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<p>The <i>getservbyname</i>(), <i>getservbyport</i>(), and <i>getservent</i>() functions may return pointers to static data, which
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may be overwritten by subsequent calls to any of these functions.</p>
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</blockquote>
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<h4><a name="tag_03_122_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_122_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_122_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="endhostent.html"><i>endhostent</i>()</a> , <a href="endprotoent.html"><i>endprotoent</i>()</a> , <a href=
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"htonl.html"><i>htonl</i>()</a> , <a href="inet_addr.html"><i>inet_addr</i>()</a> , the Base Definitions volume of
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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_122_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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