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Filter and backend programming introduction for CUPS.
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<h2 class='title'><a name="OVERVIEW">Overview</a></h2>
<p>Filters and backends may also receive <code>SIGPIPE</code> when an upstream or downstream filter/backend exits with a non-zero status. Developers should generally ignore <code>SIGPIPE</code> at the beginning of <code>main()</code> with the following function call:</p>
<pre class="example">
-#include <signal.h>>
+#include <signal.h>
...