I always got null while I request a shared memory through RTAI
skins in the user space.
Some bugs maybe exist in the sub-system. I traced the execution
stream of rt_shm_alloc, and found the mmap() operation always return
-22. I suspect the problem should be same while we use other skins,
because the mmap operation is implemented in /ksrc/nucleus/heap.c.
Is there anyone encountered this problem?
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