Question of Socket build by style FileNamespace!!!!!!!!!!!!

whao

when i test theses functions in the code below, it report an error like :
Transport endpoint is not connected
who can tell me why ? and how to correct it? thanks!

1. 
   
2. #define PATH "/tmp/DC/data"
   
3. #ifdef HAVE_CONFIG_H
   
4. #include <config.h>;
   
5. #endif
   
6. 
   
7. #include <stdio.h>;
   
8. #include <stdlib.h>;
   
9. #include <stddef.h>;
   
10. #include <errno.h>;
    
11. #include <stdlib.h>;
    
12. #include <sys/socket.h>;
    
13. #include <sys/un.h>;
    
14. 
    
15. void  write_to_server (int filedes)
    
16. {
    
17.   int nbytes;
    
18.   char *message = "Hey Guy!";
    
19.   nbytes = write (filedes,message , 2);
    
20.   if (nbytes < 0)
    
21.     {
    
22.       perror ("write:::::");
    
23.       unlink(PATH);
    
24.       exit (EXIT_FAILURE);
    
25.     }
    
26. }
    
27. 
    
28. 
    
29. 
    
30. int make_named_socket (const char *filename)
    
31. {
    
32.   struct sockaddr_un name;
    
33.   int sock;
    
34.   size_t size;
    
35. 
    
36.   /* Create the socket. */
    
37. 
    
38.   sock = socket (PF_UNIX, SOCK_DGRAM, 0);
    
39.   if (sock < 0)
    
40.     {
    
41.       perror ("socket");
    
42.       unlink(PATH);
    
43.       exit (EXIT_FAILURE);
    
44.     }
    
45. 
    
46.   /* Bind a name to the socket. */
    
47. //  unlink(PATH);
    
48.   name.sun_family = AF_FILE;
    
49.   strcpy (name.sun_path, filename);
    
50. 
    
51.   /* The size of the address is
    
52.      the offset of the start of the filename,
    
53.      plus its length,
    
54.      plus one for the terminating null byte. */
    
55.   size = (offsetof (struct sockaddr_un, sun_path)
    
56.           + strlen (name.sun_path) + 1);
    
57. 
    
58.   if (bind (sock, (struct sockaddr *) &name, size) < 0)
    
59.     {
    
60.       perror ("bind");
    
61.       unlink(PATH);     
    
62.       exit (EXIT_FAILURE);
    
63.     }
    
64. 
    
65.   return sock;
    
66. }
    
67. 
    
68. 
    
69. 
    
70. int main(int argc, char *argv[])
    
71. {
    
72.   int sock_fd;
    
73. 
    
74.   static char *path = PATH;
    
75. 
    
76.   sock_fd = make_named_socket(path);
    
77.   write_to_server (sock_fd);
    
78. 
    
79.   return EXIT_SUCCESS;
    
80. }
    

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