单项选择题

案例分析题

User programs interact with the kernel through a set of standard （）. They request services to be provided by the kernel. Such services would include accessing a file: open close, read, write, link, or execute a file; starting or（）accounting records; changing ownership of a file or （） ; changing to a new directory; creating, （） , or killing a process; enabling access to hardware devices; and setting limits on system resources. Unix is a multi -user, multi -tasking operating system. You can have many users logged into a system simultaneously, each running many programs. It’s the kernel’s job to keep each process and user separate and to regulate access to （） , including cpu, memory, disk and other L/O devices.

It’s the kernel’s job to keep each process and user separate and to regulate access to （）

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