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?

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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
Expert Solution
Step 1: Identity number

A system call's identity number is a unique integer that is assigned to each system call in a Unix-like operating system, ranging from one to roughly 256. 

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