You can use shared memory. See shm_open documentation for an example.

On Mon, 2010-04-19 at 05:15 -0400, Johnson Gu wrote:
> I made a shared library. In this library, there are a global structure variant. Usually, the each process linking this
 library has it's own copy of this structure, many processes have many special copies.
> But I want there are only one copy and all the process share this one.
> How should I do?
> 
> 
> 
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