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What is the meaning of the *(volatile void**) in c?

I was working on the "QNX RTOS" in which i came across the following line can anyone please help me to understand?

*(volatile  void **) kernel_data = (void *) & _mqx_version_number;

Regards, Omkar Dixit

Solution

  • (volatile void **)kernel_data --> cast kernel_data to pointer to pointer of type volatile void.

    Now, kernel_data is a pointer to pointer (volatile void**)
    *kernel_data is pointer of type volatile void*

    *(volatile void **) kernel_data = (void *) & _mqx_version_number;

    So, here, we are type casting kernel_data to type volatile void ** and then dereferencing it.