Example of open and close

The following program fragment shows how the driver is opened and closed. The driver must always be opened before any action can be performed:

void open_test(void)
  { int i:

    printf("opening the vcan-driver...\n");
    handle= open("/dev/vcan", O_RDWR, 0666);
    if (handle==-1)
      { printf("opening of the driver failed!\n");
        printf("errno: %d\n", errno);
        return;
      };
    /* perform some commands : */
    do_something_with_the_CAN_bus();
    /* finished */
    i= close(handle);
    if (i==-1)
      { printf("closing failed !\n");
        printf("errno: %d\n", errno);
        return;
      };
  }