Benzene is a widely used industrial chemical. Benzene is found in crude oil and is a major part of gasoline. Its used to make plastics, resins, synthetic fibers, rubber lubricants, dyes, detergents, drugs and pesticides. Benzene is produced naturally by volcanoes and forest fires. In homes, benzene may be found in glues, adhesives, cleaning products, paint strippers, tobacco smoke and gasoline.
A system call is an interface between a user-space application and a service that the kernel provides. Because the service is provided in the kernel, a direct call cannot be performed; instead, you must use a process of crossing the user-space/kernel boundary.
The Internet is a WAN as the various computers are located at geographically different places and are connected by long distance network links. Chapter 2: Operating System Structure 1. What is the purpose of system calls? Answer: System calls allow user-level processes to request services of the operating system. 2. What are the five major activities of an operating system in regard to process management? Answer: 1. The creation and deletion of both user and system processes 2.