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| <h4 class="subsection">12.21.3 Programming Your Own Custom Streams</h4> |
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| <p><a name="index-custom-streams-1160"></a><a name="index-programming-your-own-streams-1161"></a> |
| This section describes how you can make a stream that gets input from an |
| arbitrary data source or writes output to an arbitrary data sink |
| programmed by you. We call these <dfn>custom streams</dfn>. The functions |
| and types described here are all GNU extensions. |
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| <li><a accesskey="1" href="Streams-and-Cookies.html#Streams-and-Cookies">Streams and Cookies</a>: The <dfn>cookie</dfn> records where to fetch or |
| store data that is read or written. |
| <li><a accesskey="2" href="Hook-Functions.html#Hook-Functions">Hook Functions</a>: How you should define the four <dfn>hook |
| functions</dfn> that a custom stream needs. |
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