Question

can someone relate system call in OS with a function in c++

Answer 1

I believe the attachment is what you are looking for

Answer 2

System Call is the call which was called when the system call some specific function to do a specific task. I think like Create(), Open() and Read(). There are also many things that you should try on "UNIX" or Linux Command Prompt......
Also read the document which was fiven by "nincompoop".