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With "socket library" you mean libc?

yes, there is [typically] nothing else.

you can ofcourse do a syscall directly, but i am not sure what value add _that_ is, `man -S 2 syscall` for more information.

edit: 'typically' because some languages / runtimes might go the syscall route.

Thats why i ask. "the socket library" is an very odd way to refer to the libc.

Some other Unix operating systems had the functions in a own socket library, e.g. SunOS: https://docs.oracle.com/cd/E19120-01/open.solaris/817-4415/s... .

I suppose though in the context of Linux it's a bit weird, but you did get the correct meaning :).

Not in context.

Well, Go for example does syscalls directly.