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+/* Example of Local-Namespace Sockets
+ Copyright (C) 1991-2017 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License
+ as published by the Free Software Foundation; either version 2
+ of the License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#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;
+
+ /* Create the socket. */
+ sock = socket (PF_LOCAL, SOCK_DGRAM, 0);
+ if (sock < 0)
+ {
+ perror ("socket");
+ exit (EXIT_FAILURE);
+ }
+
+ /* Bind a name to the socket. */
+ name.sun_family = AF_LOCAL;
+ strncpy (name.sun_path, filename, sizeof (name.sun_path));
+ name.sun_path[sizeof (name.sun_path) - 1] = '\0';
+
+ /* The size of the address is
+ the offset of the start of the filename,
+ plus its length (not including the terminating null byte).
+ Alternatively you can just do:
+ size = SUN_LEN (&name);
+ */
+ size = (offsetof (struct sockaddr_un, sun_path)
+ + strlen (name.sun_path));
+
+ if (bind (sock, (struct sockaddr *) &name, size) < 0)
+ {
+ perror ("bind");
+ exit (EXIT_FAILURE);
+ }
+
+ return sock;
+}