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
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/* -*- c-file-style: "linux" -*-
*
* Try creating a Unix-domain socket, opening it, and reading from it.
* The POSIX name for these is AF_LOCAL/PF_LOCAL.
*
* This is used by the Samba autoconf scripts to detect systems which
* don't have Unix-domain sockets, such as (probably) VMS, or systems
* on which they are broken under some conditions, such as RedHat 7.0
* (unpatched). We can't build WinBind there at the moment.
*
* Coding standard says to always use exit() for this, not return, so
* we do.
*
* Martin Pool <mbp@samba.org>, June 2000. */
/* TODO: Look for AF_LOCAL (most standard), AF_UNIX, and AF_FILE. */
#include <stdio.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_SYS_UN_H
# include <sys/un.h>
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#if HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#if HAVE_ERRNO_DECL
# include <errno.h>
#else
extern int errno;
#endif
static int bind_socket(char const *filename)
{
int sock_fd;
struct sockaddr_un name;
size_t size;
/* Create the socket. */
if ((sock_fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
perror ("socket(PF_LOCAL, SOCK_STREAM)");
exit(1);
}
/* 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.
Alternatively you can just do:
size = SUN_LEN (&name);
*/
size = SUN_LEN(&name);
/* XXX: This probably won't work on unfriendly libcs */
if (bind(sock_fd, (struct sockaddr *) &name, size) < 0) {
perror ("bind");
exit(1);
}
return sock_fd;
}
int main(void)
{
int sock_fd;
int kid;
char const *filename = "conftest.unixsock.sock";
/* abolish hanging */
alarm(15); /* secs */
if ((sock_fd = bind_socket(filename)) < 0)
exit(1);
/* the socket will be deleted when autoconf cleans up these
files. */
exit(0);
}
|
