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I am reading this page. It seems that there are some functions in programming, which serve as API to the system call. What are the meaning of "identity number" and "table indexed" on this page?Any example?

I am reading this page. It seems that there are some functions in programming, which serve as API to the system call. What are the meaning of "identity number" and "table indexed" on this page?Any example?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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I am reading this page. It seems that there are some functions in programming, which serve as API to the system call. What are the meaning of "identity number" and "table indexed" on this page?Any example?
System Call Implementation For most programming languages, the run-time environment (RTE) (a set of functions built into libraries) provide a system call interface that serves as the link to system calls made available by the operating system • An identity number is associated with each system call • The system-call interface maintains a table indexed according to these numbers I The system call interface - functions • intercepts function calls in the API • invokes the necessary system call within the OS, and returns status of the system call and return value(s), if any Silberschatz, Galvin and Gagne ©2018 Operating System Concepts- 10th Edition 2.18
Transcribed Image Text:System Call Implementation For most programming languages, the run-time environment (RTE) (a set of functions built into libraries) provide a system call interface that serves as the link to system calls made available by the operating system • An identity number is associated with each system call • The system-call interface maintains a table indexed according to these numbers I The system call interface - functions • intercepts function calls in the API • invokes the necessary system call within the OS, and returns status of the system call and return value(s), if any Silberschatz, Galvin and Gagne ©2018 Operating System Concepts- 10th Edition 2.18
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