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

int main(int argc, char **argv)
{
 struct sockaddr_un address;
 int socket_fd, nbytes;
 char buffer[256];
 int num_samples;

 if (argc != 2)
 {
   printf("Usage:\n");
   printf("  unixdomain_client <num_samples_to_send>\n");
   return 0;
 }
 num_samples = atoi(argv[1]);
 if (num_samples <= 0)
 {
   printf("Number of samples to send must be >0\n");
   return 1;
 }
 fprintf(stderr, "Number of samples to send: %d\n", num_samples);
 /* We shohuld send N+1 packets to get N diffs */
 num_samples = num_samples+1;

 socket_fd = socket (PF_UNIX, SOCK_DGRAM, 0);
 if (socket_fd < 0)
   {
     printf ("socket() failed\n");
     return 1;
   }

 /* start with a clean address structure */
 memset (&address, 0, sizeof (struct sockaddr_un));

 address.sun_family = AF_UNIX;
 snprintf (address.sun_path, FILENAME_MAX, "./demo_socket");

 if (connect (socket_fd,
          (struct sockaddr *) &address,
          sizeof (struct sockaddr_un)) != 0)
   {
     printf ("connect() failed\n");
     return 1;
   }

 for (int i=0; i<num_samples; i++)
   {
     struct timeval tv;

     gettimeofday (&tv, NULL);
     write (socket_fd, &tv, sizeof (tv));
     usleep (100);
   }

 return 0;
}