about summary refs log tree commit diff
path: root/manual/examples/mkfsock.c
blob: 8683fbdc547acfb967f7da555f5b0fd11923f0aa (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
#include <stddef.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.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_UNIX, 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));

  /* The size of the address is
     the offset of the start of the filename,
     plus its length,
     plus one for the terminating null byte.
     Alternativly you can just do:
     size = SUN_LEN (&name);
  */
  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;
}