#include <stdlib.h> 
#include <stdio.h> 
#include <string.h> 
#include <errno.h> 
#include <sys/stat.h> 
#include <signal.h> 
#include <dbus/dbus.h> 
#include <pthread.h> 
#include <unistd.h> 

void 
dbus_send_signal( 
     const char *sender_object_path, 
     const char *iface, 
     const char *signal_name, 
     int first_arg_type, 
     ...) 
 { 
     DBusMessage *message_ptr; 
     va_list ap; 
  
   DBusConnection* conn;
   DBusError err;

   // initialise the error value
   dbus_error_init(&err);

   // connect to the DBUS system bus, and check for errors
   conn = dbus_bus_get(DBUS_BUS_SESSION, &err);
   if (dbus_error_is_set(&err)) {
      fprintf(stderr, "Connection Error (%s)\n", err.message);
      dbus_error_free(&err);
   }
   if (NULL == conn) {
      exit(1);
   }

   // register our name on the bus, and check for errors
   ret = dbus_bus_request_name(conn, "test.signal.source", 
                               DBUS_NAME_FLAG_REPLACE_EXISTING , &err);
   if (dbus_error_is_set(&err)) {
      fprintf(stderr, "Name Error (%s)\n", err.message);
      dbus_error_free(&err);
   }
   if (DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER != ret) {
      exit(1);
   } 
     va_start(ap, first_arg_type);  

     message_ptr = dbus_message_new_signal(sender_object_path, iface, signal_name); 
     if (message_ptr == NULL) 
     { 
         printf("dbus_message_new_signal() failed."); 
         goto exit; 
     } 
  
     if (!dbus_message_append_args_valist(message_ptr, first_arg_type, ap)) 
     { 
         printf("dbus_message_append_args_valist() failed."); 
         goto unref; 
     } 
  
     /* Add message to outgoing message queue */ 
     if (!dbus_connection_send(conn, message_ptr, NULL)) 
     { 
         printf("dbus_connection_send() failed."); 
         goto unref; 
     } 
  
 unref: 
    dbus_message_unref(message_ptr); 
  
 exit: 
     va_end(ap); 
} 

int main(int argc, char** argv)
{
   dbus_send_signal("/IO/Processor","Recorder.Set",               "dviRecordingPolicy",
               DBUS_TYPE_UINT32,
               32,
               DBUS_TYPE_UINT32
               42);
   return 0;
}