unix domain socket示例一(SOCK_DGRAM)

 1 #include <stdio.h>
 2 #include <string.h>
 3 #include <unistd.h>
 4 #include <stdlib.h>
 5 #include <sys/types.h>
 6 #include <sys/socket.h>
 7 #include <sys/un.h>
 8 #include <stddef.h>
 9 
10 #define SRC_ADDR "/var/run/uds_test.socket"
11 
12 int main (int argc, char **argv)
13 {
14     int sockfd;
15     struct sockaddr_un src;
16     int ret;
17 
18     unlink (SRC_ADDR);
19     sockfd = socket (AF_UNIX, SOCK_DGRAM, 0);
20     if (sockfd < 0) {
21         perror ("create socket failed");
22         exit (EXIT_FAILURE);
23     }
24 
25     memset (&src, 0, sizeof (src));
26     src.sun_family = AF_UNIX;
27     strcpy (src.sun_path, SRC_ADDR);
28     int len;
29     len = offsetof (struct sockaddr_un, sun_path) +
30         sizeof (SRC_ADDR);
31 
32     if (bind (sockfd, (struct sockaddr *)&src, len) < 0) {
33         perror ("bind socket failed");
34         exit (EXIT_FAILURE);
35     }
36 
37     size_t size = 0;
38     char buf[BUFSIZ] ={‘\0‘};
39     for (;;) {
40         size = recvfrom (sockfd,buf, BUFSIZ,0,
41                 NULL, NULL);
42 
43         if (size > 0)
44             printf ("recv: %s\n", buf);
45 
46     }
47 
48     return 0;
49 }

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stddef.h>
#include <time.h>

#define DST_ADDR "/var/run/uds_test.socket"

int main (int argc, char **argv)
{
    int sockfd;
    struct sockaddr_un dst;
    int ret;

    sockfd = socket (AF_UNIX, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        perror ("create socket failed");
        exit (EXIT_FAILURE);
    }

    memset (&dst, 0, sizeof (dst));
    dst.sun_family = AF_UNIX;
    strcpy (dst.sun_path, DST_ADDR);
    int len;
    len = offsetof (struct sockaddr_un, sun_path) +
        sizeof (DST_ADDR);

    time_t t;
    char *str;

    for (;;) {
        t = time (NULL);
        str = ctime (&t);
        if (str == NULL)
            break;

        sendto (sockfd, str, strlen (str),0,
                (struct sockaddr *)&dst,len);

        sleep (1);
    }

    return 0;

    
}