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Consider the following statements: 1. System calls provide the interface between a process and the operating system 2. PERL implementations include direct system call access 3. System calls occur in different ways depending on the computer in use Which of the above statements are correct?

Consider the following statements: 1. System calls provide the interface between a process and the operating system 2. PERL implementations include direct system call access 3. System calls occur in different ways depending on the computer in use Which of the above statements are correct? Correct Answer 1, 2 and 3

System calls:

  • System calls provide the interface between a process and the operating system. These calls are generally available as assembly-language instructions.
  • Some systems may allow system calls to be made directly from a high-level language program, in which case the calls normally resemble predefined function or subroutine calls.
  • They may generate a call run time routine that makes the system call or the system call may be generated directly in-line.
  • Several languages such as C, Biss, PL/360 and PERL have been defined to replace assembly language for systems programming. These languages allow system calls to be made directly.
  • System calls occur in different ways, depending on the computer in use. The exact type and amount of information vary according to the particular operating system and call.

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