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63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/* Example of Local-Namespace Sockets
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Copyright (C) 1991-2020 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <stddef.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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int
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make_named_socket (const char *filename)
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{
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struct sockaddr_un name;
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int sock;
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size_t size;
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/* Create the socket. */
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sock = socket (PF_LOCAL, SOCK_DGRAM, 0);
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if (sock < 0)
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{
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perror ("socket");
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exit (EXIT_FAILURE);
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}
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/* Bind a name to the socket. */
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name.sun_family = AF_LOCAL;
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strncpy (name.sun_path, filename, sizeof (name.sun_path));
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name.sun_path[sizeof (name.sun_path) - 1] = '\0';
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/* The size of the address is
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the offset of the start of the filename,
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plus its length (not including the terminating null byte).
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Alternatively you can just do:
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size = SUN_LEN (&name);
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*/
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size = (offsetof (struct sockaddr_un, sun_path)
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+ strlen (name.sun_path));
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if (bind (sock, (struct sockaddr *) &name, size) < 0)
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{
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perror ("bind");
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exit (EXIT_FAILURE);
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}
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return sock;
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}
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