The previously allocated numbers do not change or get reassigned because doing so could break existing applications or libraries, that is, it would break backward compatibility 3. The assignment of numbers for each service call is done by the maintainer of the operating systems. 2.Įach service call is assigned an operating system service identifier in the form of an integer. 1.Įach service call has a user space library wrapper providing a function for each call. The general design pattern used for service calls is as follows (using Linux as an example). The operating system services are exposed through function wrappers provided as part of the POSIX/C Libraries.
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