139 lines
5.3 KiB
HTML
139 lines
5.3 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>endprotoent</title>
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<body bgcolor="white">
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<basefont size="3"> <a name="endprotoent"></a> <a name="tag_03_120"></a><!-- endprotoent -->
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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_120_01"></a>NAME</h4>
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<blockquote>endprotoent, getprotobyname, getprotobynumber, getprotoent, setprotoent - network protocol database
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functions</blockquote>
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<h4><a name="tag_03_120_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 endprotoent(void);<br>
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struct protoent *getprotobyname(const char *</tt><i>name</i><tt>);<br>
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struct protoent *getprotobynumber(int</tt> <i>proto</i><tt>);<br>
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struct protoent *getprotoent(void);<br>
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void setprotoent(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_120_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>These functions shall retrieve information about protocols. This information is considered to be stored in a database that can
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be accessed sequentially or randomly. The implementation of this database is unspecified.</p>
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<p>The <i>setprotoent</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 connection to the network protocol database shall not be closed after each call to
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<i>getprotoent</i>() (either directly, or indirectly through one of the other <a href=
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"../functions/getprotobyname.html"><i>getproto*</i>()</a> functions), and the implementation may maintain an open file descriptor for
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the database.</p>
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<p>The <i>getprotobyname</i>() function shall search the database from the beginning and find the first entry for which the
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protocol name specified by <i>name</i> matches the <i>p_name</i> member, opening and closing a connection to the database as
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necessary.</p>
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<p>The <i>getprotobynumber</i>() function shall search the database from the beginning and find the first entry for which the
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protocol number specified by <i>proto</i> matches the <i>p_proto</i> member, opening and closing a connection to the database as
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necessary.</p>
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<p>The <i>getprotoent</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>getprotobyname</i>(), <i>getprotobynumber</i>(), and <i>getprotoent</i>() functions shall each return a pointer to a
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<b>protoent</b> structure, the members of which shall contain the fields of an entry in the network protocol database.</p>
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<p>The <i>endprotoent</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_120_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>getprotobyname</i>(), <i>getprotobynumber</i>(), and <i>getprotoent</i>() return a pointer to a
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<b>protoent</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_120_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_120_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_120_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The <i>getprotobyname</i>(), <i>getprotobynumber</i>(), and <i>getprotoent</i>() functions may return pointers to static data,
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which 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_120_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_120_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_120_10"></a>SEE ALSO</h4>
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<blockquote>
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<p>The Base 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_120_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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