Compare and contrast the three different methods to pass parameters into a system call.
Introduction
System call: A system call is a programming interface that enables an application to ask the operating system for service. Operating systems typically offer a collection (or high-level Application Programming Interface, or API), which stands in between regular applications and the remainder of the operating system. For example, Linux's POSIX library manages processes. This library takes care of all data preparation and processing that doesn't need privileged mode, in addition to the low-level intricacies of information delivery to the kernel or entering supervisor mode. In theory, this lessens the operating system's dependence on the application and improves portability. There are numerous system calls in many of the operating systems used today.
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