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authorgdamore <gdamore@users.noreply.github.com>2024-11-09 18:13:25 +0000
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+<h1 id="sockets"><a class="header" href="#sockets">Sockets</a></h1>
+<p>Sockets <a name="a001"></a> in Scalability Protocols provide the handle for communication
+between peers. Sockets also encapsulate protocol specific semantics, such as
+filtering subscriptions, or automatically retrying requests.</p>
+<h2 id="socket-structure"><a class="header" href="#socket-structure">Socket Structure</a></h2>
+<pre><code class="language-c">#define NNG_SOCKET_INITIALIZER // opaque value
+
+typedef struct nng_socket_s nng_socket;
+</code></pre>
+<p>The <a name="a002"></a><code>nng_socket</code> structure represents socket. This is a handle, and
+the members of it are opaque. However, unlike a pointer, it is usually
+passed by value.</p>
+<p>A socket may be initialized statically with the <code>NNG_SOCKET_INITIALIZER</code> macro,
+to ensure that it cannot be confused with a valid open socket.</p>
+<h2 id="socket-identity"><a class="header" href="#socket-identity">Socket Identity</a></h2>
+<pre><code class="language-c">int nng_socket_id(nng_socket s);
+int nng_socket_raw(nng_socket s, bool *raw);
+int nng_socket_proto_id(nng_socket s, uint16_t *proto);
+int nng_socket_peer_id(nng_socket s, uint16_t *proto);
+int nng_socket_proto_name(nng_socket s, const char **name);
+int nng_socket_peer_name(nng_socket s, const char **name);
+</code></pre>
+<p>These functions are used to provide fundamental information about the socket <em>s</em>.
+Most applications will not need to use these functions.</p>
+<p>The <a name="a003"></a><code>nng_socket_id</code> function returns the numeric id, which will be a non-negative
+value, associated with the socket. If the socket is uninitialized (has never been opened),
+then the return value may be <code>-1</code>.</p>
+<p>The <a name="a004"></a><code>nng_socket_proto_id</code> and <a name="a005"></a><code>nng_socket_peer_id</code> functions provide the 16-bit
+protocol identifier for the socket’s protocol, and of the protocol peers will use when
+communicating with the socket.</p>
+<p>The <a name="a006"></a><code>nng_socket_proto_name</code> and <a name="a007"></a><code>nng_socket_peer_name</code> functions provide the ASCII
+names of the socket’s protocol, and of the protocol peers of the socket use.
+The value stored in <em>name</em> is a fixed string located in program text, and must not be freed
+or altered. It is guaranteed to remain valid while this library is present.</p>
+<p>The <a name="a008"></a><code>nng_socket_raw</code> function determines whether the socket is in
+<a href="/TODO.html">raw mode</a> or not, storing <code>true</code> in <em>raw</em> if it is, or <code>false</code> if it is not.</p>
+<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
+<h3 id="example-1-initializing-a-socket"><a class="header" href="#example-1-initializing-a-socket">Example 1: Initializing a Socket</a></h3>
+<pre><code class="language-c">nng_socket s = NNG_SOCKET_INITIALIZER;
+</code></pre>
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