System calls function and library function

viveksahu26 · 09-13-2021, 02:55 AM

So, Can I say that a library function when invoked in the code uses the system call function to execute itself ?

berndbausch · 09-13-2021, 04:57 AM

No. There are library functions that don't use system calls, such as many (or all?) math functions.

pan64 · 09-13-2021, 05:41 AM

Quote:

Originally Posted by viveksahu26

So, Can I say that a library function when invoked in the code uses the system call function to execute itself ?

Yes, you can say [whatever you want], but it is not true. And most probably meaningless. What do you mean by "uses system call function to execute itself"?
this is how a c function call works (in general): https://stackoverflow.com/questions/...callstack-work
What do you really want to know?

hazel · 09-13-2021, 06:59 AM

I guess what the OP has in mind are the f- family of file access calls like fopen, fread and so on. These are indeed programmer-friendly wrappers for the system calls whose names are given by removing the f-prefix. But most C-library functions are not of this kind.

zeebra · 09-14-2021, 04:25 AM

Sounds suspiciously like a homework question to me.