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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 <stddef.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/socket.h> |
| #include <sys/un.h> |
| |
| 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 < 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 (&name); |
| </span> */ |
| size = (offsetof (struct sockaddr_un, sun_path) |
| + strlen (name.sun_path) + 1); |
| |
| if (bind (sock, (struct sockaddr *) &name, size) < 0) |
| { |
| perror ("bind"); |
| exit (EXIT_FAILURE); |
| } |
| |
| return sock; |
| } |
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