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<div id="contentBody"><div class="title_container"><div class="page_title">Net::netent</div></div><ul><li><a href="#NAME">NAME</a><li><a href="#SYNOPSIS">SYNOPSIS</a><li><a href="#DESCRIPTION">DESCRIPTION</a><li><a href="#EXAMPLES">EXAMPLES</a><li><a href="#NOTE">NOTE</a><li><a href="#AUTHOR">AUTHOR</a></ul><a name="NAME"></a><h1>NAME</h1>

Net::netent - by-name interface to Perl's built-in getnet*() functions

<a name="SYNOPSIS"></a><h1>SYNOPSIS</h1>

<pre class="verbatim"> <a class="l_k" href="../functions/use.html">use</a> <a class="l_w" href="../Net/netent.html">Net::netent</a> qw(:FIELDS);

<pre class="verbatim"> <a class="l_k" href="../functions/use.html">use</a> Net::netent qw(:FIELDS);

<a class="l_k" href="../functions/getnetbyname.html">getnetbyname</a>("loopback") or <a class="l_k" href="../functions/die.html">die</a> "bad net";

<a class="l_k" href="../functions/printf.html">printf</a> "%s is %08X\n", $n_name, $n_net;</pre>

<pre class="verbatim"> <a class="l_k" href="../functions/use.html">use</a> <a class="l_w" href="../Net/netent.html">Net::netent</a>;</pre>

<pre class="verbatim"> <a class="l_k" href="../functions/use.html">use</a> Net::netent;</pre>

<pre class="verbatim"> $n = <a class="l_k" href="../functions/getnetbyname.html">getnetbyname</a>("loopback") or <a class="l_k" href="../functions/die.html">die</a> "bad net";

{ # there's gotta be a better way, eh?

@bytes = <a class="l_k" href="../functions/unpack.html">unpack</a>("C4", <a class="l_k" href="../functions/pack.html">pack</a>("N", $n->net));

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"Net::netent" objects. This object has methods that return the similarly

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named structure field name from the C's netent structure from netdb.h;

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namely name, aliases, addrtype, and net. The aliases

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method returns an array reference, the rest scalars.

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method returns an array reference, the rest scalars.

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You may also import all the structure fields directly into your namespace

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as regular variables using the :FIELDS import tag. (Note that this still

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overrides your core functions.) Access these fields as variables named

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with a preceding <code class="inline">n_</code>

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with a preceding <code class="inline">n_</code>

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. Thus, <code class="inline">$net_obj->name()</code>

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corresponds to

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$n_name if you import the fields. Array references are available as

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pass the <code class="inline"><a class="l_k" href="../functions/use.html">use</a></code> an empty import list, and then access

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function functions with their full qualified names.

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On the other hand, the built-ins are still available

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via the <code class="inline">CORE::</code>

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via the <code class="inline">CORE::</code>

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pseudo-package.

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<a name="EXAMPLES"></a><h1>EXAMPLES</h1>

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The getnet() functions do this in the Perl core:

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<pre class="verbatim"> sv_setiv(sv, (I32)nent->n_net);</pre>The gethost() functions do this in the Perl core:

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<pre class="verbatim"> sv_setpvn(sv, hent->h_addr, len);</pre>

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<pre class="verbatim"> sv_setpvn(sv, hent->h_addr, len);</pre>

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That means that the address comes back in binary for the

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host functions, and as a regular perl integer for the net ones.

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This seems a bug, but here's how to deal with it:

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<pre class="verbatim"> <a class="l_k" href="../functions/use.html">use</a> <a class="l_w" href="../strict.html">strict</a>;

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<a class="l_k" href="../functions/use.html">use</a> <a class="l_w" href="../Socket.html">Socket</a>;

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<a class="l_k" href="../functions/use.html">use</a> <a class="l_w" href="../Net/netent.html">Net::netent</a>;</pre>

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<pre class="verbatim"> <a class="l_k" href="../functions/use.html">use</a> strict;

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<a class="l_k" href="../functions/use.html">use</a> Socket;

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<a class="l_k" href="../functions/use.html">use</a> Net::netent;</pre>

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<pre class="verbatim"> @ARGV = ('loopback') unless @ARGV;</pre>

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<pre class="verbatim"> for $net ( @ARGV ) {</pre><pre class="verbatim"> unless ($n = <a class="l_k" href="../functions/getnetbyname.html">getnetbyname</a>($net)) {

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<a class="l_k" href="../functions/lc.html">lc</a>($n->name) eq <a class="l_k" href="../functions/lc.html">lc</a>($net) ? "" : "*really* ",

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$n->name;</pre>

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<pre class="verbatim"> <a class="l_k" href="../functions/print.html">print</a> "\taliases are ", <a class="l_k" href="../functions/join.html">join</a>(", ", @{$n->aliases}), "\n"

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if @{$n->aliases}; </pre>

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if @{$n->aliases};</pre>

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<pre class="verbatim"> # this is stupid; first, why is this not in binary?

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# second, why am i going through these convolutions

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# to make it looks right

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</form>

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<h2>Labels:</h2>

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