📄 getprotobyname.html

📁 unix 下的C开发手册,还用详细的例程。
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>endprotoent</title></head><body bgcolor=white><center><font size=2>The Single UNIX &reg; Specification, Version 2<br>Copyright &copy; 1997 The Open Group</font></center><hr size=2 noshade><h4>NAME</h4><blockquote>endprotoent, getprotobynumber, getprotobyname, getprotoent, setprotoent - network protocol database functions</blockquote><h4>SYNOPSIS</h4><blockquote><pre><code>#include &lt;<a href="netdb.h.html">netdb.h</a>&gt;void endprotoent(void);struct protoent *getprotobyname(const char *<I>name</I>);struct protoent *getprotobynumber(int <I>proto</I>);struct protoent *getprotoent(void);void setprotoent(int <I>stayopen</I>);</code></pre></blockquote><h4>DESCRIPTION</h4><blockquote>The<i>getprotobyname()</i>,<i>getprotobynumber()</i>and<i>getprotoent()</i>,functions each return a pointer to a <B>protoent</B> structure, the members ofwhich contain the fields of an entry in the network protocol database.<p>The<i>getprotoent()</i>function reads the next entry of the database, opening a connection to thedatabase if necessary.<p>The<i>getprotobyname()</i>function searches the database from the beginning and finds the first entryfor which the protocol name specified by <I>name</I> matches the <B>p_name</B>member, opening a connection to the database if necessary.<p>The<i>getprotobynumber()</i>function searches the database from the beginning and finds the first entryfor which the protocol number specified by <I>number</I> matches the<B>p_proto</B> member, opening a connection to the database if necessary.<p>The<i>setprotoent()</i>function opens a connection to the database, and sets the next entry to thefirst entry.  If the <I>stayopen</I> argument is non-zero, the connection tothe network protocol database will not be closed after each call to<i>getprotoent()</i>(either directly, or indirectly through one of the other<i>getproto*()</i>functions).<p>The<i>endprotoent()</i>function closes the connection to the database.</blockquote><h4>RETURN VALUES</h4><blockquote>On successful completion,<i>getprotobyname()</i>,<i>getprotobynumber()</i>and<i>getprotoent()</i>functions return a pointer to a <B>protoent</B> structure if the requestedentry was found, and a null pointer if the end of the database was reached orthe requested entry was not found.  Otherwise, a null pointer is returned.</blockquote><h4>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4>APPLICATION USAGE</h4><blockquote>The<i>getprotobyname()</i>,<i>getprotobynumber()</i>and<i>getprotoent()</i>functions may return pointers to static data, which may be overwritten bysubsequent calls to any of these functions.<p>These functions are generally used with the Internet address family.</blockquote><h4>SEE ALSO</h4><blockquote><i><a href="netdb.h.html">&lt;netdb.h&gt;</a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX &reg; is a registered Trademark of The Open Group.<br>Copyright &copy; 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>
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