The os/signal package uses non-blocking channel sends when delivering signals. If the receiving end of the channel isn't ready and the channel is either unbuffered or full, the signal will not be captured. To avoid missing signals, the channel should be buffered and of the appropriate size. For a channel used for notification of just one signal value, a buffer of size 1 is sufficient.

Bad practice

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<pre><span></span><code><span class="nx">sigs</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nb">make</span><span class="p">(</span><span class="kd">chan</span><span class="w"> </span><span class="nx">os</span><span class="p">.</span><span class="nx">Signal</span><span class="p">)</span>
<span class="nx">signal</span><span class="p">.</span><span class="nx">Notify</span><span class="p">(</span><span class="nx">sigs</span><span class="p">,</span><span class="w"> </span><span class="nx">syscall</span><span class="p">.</span><span class="nx">SIGINT</span><span class="p">,</span><span class="w"> </span><span class="nx">syscall</span><span class="p">.</span><span class="nx">SIGTERM</span><span class="p">)</span>
</code></pre>
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Recommended

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<pre><span></span><code><span class="nx">sigs</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="nb">make</span><span class="p">(</span><span class="kd">chan</span><span class="w"> </span><span class="nx">os</span><span class="p">.</span><span class="nx">Signal</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">)</span>
<span class="nx">signal</span><span class="p">.</span><span class="nx">Notify</span><span class="p">(</span><span class="nx">sigs</span><span class="p">,</span><span class="w"> </span><span class="nx">syscall</span><span class="p">.</span><span class="nx">SIGINT</span><span class="p">,</span><span class="w"> </span><span class="nx">syscall</span><span class="p">.</span><span class="nx">SIGTERM</span><span class="p">)</span>
</code></pre>
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concourse / concourse

No ignore rules found