User programs interact with the kernel through a set of standard(71). They request services to be provided by the kernel. Such s

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问题 User programs interact with the kernel through a set of standard(71). 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(72)accounting records; changing ownership of a file or(73); changing to a new directory; creating,(74), 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(75), including cpu, memory, disk and other L/O devices.

选项 A、system commands
B、system transfer
C、system calls
D、system rings

答案C

解析 system calls:系统调用
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