Give at least 2 reasons that modern operating systems switch from user to kernel mode to perform I/O operations, such as turning on a webcam or using a microphone. Provide 3 other examples of such I/O operations. For each example, describe the process for doing this in general terms. Are the reasons that you stated worth the overhead of switching from user mode to kernel mode, and then back to user mode? If you were to design an OS, what would you do differently?

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.