[CSE]  Advanced Operating Systems 
  COMP9242 2002/S2  		UNSW
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Next: References Up: 01-l4 Previous: What to run first?

Where's the OS?

How does a client know where to send syscall RPCs?
  1. First action of new task could be an ``open receive'':
    • parent sends message (thereby disclosing its identity)
    • hide in startup code (``crt0'')
  2. Client could send all system call RPCs to \(\sigma_0\):
    • clans & chiefs mechanism ensures that parent receives message,
    • parent replies by ``deceiving send'' pretending to be \(\sigma_0\).
==> It's a matter of convention.


Gernot Heiser 2002-08-07