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<h4 class="subsection">16.5.3 Example of Local-Namespace Sockets</h4>

<p>Here is an example showing how to create and name a socket in the local
namespace.

<pre class="smallexample">     #include &lt;stddef.h&gt;
     #include &lt;stdio.h&gt;
     #include &lt;errno.h&gt;
     #include &lt;stdlib.h&gt;
     #include &lt;string.h&gt;
     #include &lt;sys/socket.h&gt;
     #include &lt;sys/un.h&gt;
     
     int
     make_named_socket (const char *filename)
     {
       struct sockaddr_un name;
       int sock;
       size_t size;
     
       /* <span class="roman">Create the socket.</span> */
       sock = socket (PF_LOCAL, SOCK_DGRAM, 0);
       if (sock &lt; 0)
         {
           perror ("socket");
           exit (EXIT_FAILURE);
         }
     
       /* <span class="roman">Bind a name to the socket.</span> */
       name.sun_family = AF_LOCAL;
       strncpy (name.sun_path, filename, sizeof (name.sun_path));
       name.sun_path[sizeof (name.sun_path) - 1] = '\0';
     
       /* <span class="roman">The size of the address is
          the offset of the start of the filename,
          plus its length,
          plus one for the terminating null byte.
          Alternatively you can just do:
          size = SUN_LEN (&amp;name);
     </span> */
       size = (offsetof (struct sockaddr_un, sun_path)
               + strlen (name.sun_path) + 1);
     
       if (bind (sock, (struct sockaddr *) &amp;name, size) &lt; 0)
         {
           perror ("bind");
           exit (EXIT_FAILURE);
         }
     
       return sock;
     }
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