int ioctl_shm_open(struct ipc_driver *drv, unsigned long arg)
{
int error = 0;
struct ipc_create_t ipc_param;
if(copy_from_user(&ipc_param, (void *)arg, sizeof(struct ipc_create_t))) {
err_msg(err_trace, "%s(): Error in copy_from_user()\n", __FUNCTION__);
error = -EFAULT;
goto do_exit;
}
ipc_param.handle = ipc_shm_open( drv, &ipc_param );
if(!ipc_param.handle) {
err_msg(err_trace, "%s(): Error in ipc_shm_open()\n", __FUNCTION__);
error = -EINVAL;
goto do_exit;
}
if(copy_to_user((void*)arg, (void*)&ipc_param, sizeof(struct ipc_create_t))) {
err_msg(err_trace, "%s(): Error in copy_to_user()\n", __FUNCTION__);
error = -EFAULT;
goto do_exit;
}
do_exit:
return error;
}
void main(int argc, char **argv)
{
int error;
ipc_shm shm;
void *mem;
unsigned int size;
if (argc > 2)
{
printf("Incorrect number of arguments.\n");
}
else if (argc == 1)
{
error = ipc_shm_open("my_shm", &mem, &size);
if (error)
{
printf("Error #%d opening the shared memory area.\n", error);
exit(0);
}
printf("Read message \"%s\" from shared memory area.\n", (char *)mem);
ipc_shm_close(mem);
}
else
{
error = ipc_shm_create(&shm, "my_shm", 1024, &mem);
if (error)
{
printf("Error #%d creating the shared memory area.\n", error);
exit(0);
}
printf("Posting message \"%s\" to shared memory area.\n", argv[1]);
strcpy((char *)mem, argv[1]);
printf("Press the return key to end the program.\n");
getchar();
ipc_shm_destroy(&shm);
}
}
