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system V interprocess communication (ipc) ?

Although uC linux as distributed by axis has msg.c incorporated in the
kernel, the <sys/msg.h> header file is
strangely missing.

Was this forgotten (can I use a msg.h copy from another system?), or was it
removed because there were problems with it?

Which forms of interprocess communications are supported?
  system V ipc
  shared memory and semaphores