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pointer to function


show a simple, intramodule cal
show that there's more than one way to pass args -- can do via a struct
show that we can pass a struct across module boundaries
show that we can pass a struct through an indirection mechanism (SYSCALL)

  - defined
     -- user.c
     -- os.h
     -- os_user.c
     -- os_traphandler.c
     __ os_utils.c