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<div id="breadCrumbs"><a href="../index.html">Home</a> > <a href="../index-language.html">Language reference</a> > <a href="../index-functions.html">Functions</a> > flock</div>
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network; you would need to use the more system-specific <code class="inline"><a class="l_k" href="../functions/fcntl.html">fcntl</a></code> for
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that. If you like you can force Perl to ignore your system's flock(2)
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function, and so provide its own fcntl(2)-based emulation, by passing
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the switch <code class="inline">-Ud_flock</code>
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the switch <code class="inline">-<span class="w">Ud_flock</span></code>
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to the <i>Configure</i> program when you configure
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<p>Here's a mailbox appender for BSD systems.</p>
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<pre class="verbatim"> <a class="l_k" href="../functions/use.html">use</a> <a class="l_w" href="../Fcntl.html">Fcntl</a> <span class="q">':flock'</span><span class="sc">;</span> <span class="c"># import LOCK_* constants</span></pre>
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<pre class="verbatim"> <a class="l_k" href="../functions/use.html">use</a> <span class="w">Fcntl</span> <span class="q">':flock'</span><span class="sc">;</span> <span class="c"># import LOCK_* constants</span></pre>
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<pre class="verbatim"><a name="lock"></a> sub <span class="m">lock</span> <span class="s">{</span>
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<a class="l_k" href="../functions/flock.html">flock</a><span class="s">(</span>MBOX<span class="cm">,</span>LOCK_EX<span class="s">)</span><span class="sc">;</span>
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<a class="l_k" href="../functions/flock.html">flock</a><span class="s">(</span><span class="w">MBOX</span><span class="cm">,</span><span class="w">LOCK_EX</span><span class="s">)</span><span class="sc">;</span>
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<span class="c"># and, in case someone appended</span>
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<span class="c"># while we were waiting...</span>
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<a class="l_k" href="../functions/seek.html">seek</a><span class="s">(</span>MBOX<span class="cm">,</span> <span class="n">0</span><span class="cm">,</span> <span class="n">2</span><span class="s">)</span><span class="sc">;</span>
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<a class="l_k" href="../functions/seek.html">seek</a><span class="s">(</span><span class="w">MBOX</span><span class="cm">,</span> <span class="n">0</span><span class="cm">,</span> <span class="n">2</span><span class="s">)</span><span class="sc">;</span>
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<span class="s">}</span></pre>
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<pre class="verbatim"><a name="unlock"></a> sub <span class="m">unlock</span> <span class="s">{</span>
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<a class="l_k" href="../functions/flock.html">flock</a><span class="s">(</span>MBOX<span class="cm">,</span>LOCK_UN<span class="s">)</span><span class="sc">;</span>
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<a class="l_k" href="../functions/flock.html">flock</a><span class="s">(</span><span class="w">MBOX</span><span class="cm">,</span><span class="w">LOCK_UN</span><span class="s">)</span><span class="sc">;</span>
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<span class="s">}</span></pre>
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<pre class="verbatim"> <a class="l_k" href="../functions/open.html">open</a><span class="s">(</span>MBOX<span class="cm">,</span> <span class="q">">>/usr/spool/mail/$ENV{'USER'}"</span><span class="s">)</span>
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<pre class="verbatim"> <a class="l_k" href="../functions/open.html">open</a><span class="s">(</span><span class="w">MBOX</span><span class="cm">,</span> <span class="q">">>/usr/spool/mail/$ENV{'USER'}"</span><span class="s">)</span>
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or <a class="l_k" href="../functions/die.html">die</a> <span class="q">"Can't open mailbox: $!"</span><span class="sc">;</span></pre>
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<pre class="verbatim"> <a class="l_k" href="../functions/lock.html">lock</a><span class="s">(</span><span class="s">)</span><span class="sc">;</span>
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<a class="l_k" href="../functions/print.html">print</a> <span class="i">MBOX</span> <span class="i">$msg</span><span class="cm">,</span><span class="q">"\n\n"</span><span class="sc">;</span>
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