Chapter 2: Operating-System Structures. Adapted to COP4610 by Robert van Engelen. Operating System Services. One set of operating-system services provides functions that are helpful to the user: User interface - Almost all operating systems have a user interface (UI)
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Adapted to COP4610 by Robert van Engelen
GUI (Mac OS X)
System callindex table
System callservice routineSystem Call Implementation
ld R1,#SYSCALL_OPENld R2,parameter_block
Policy: What will be done?Mechanism: How to do it?
MS-DOS layered structure
(a) At system startup (b) running a program